for Journals by Title or ISSN
for Articles by Keywords
help
  Subjects -> CHEMISTRY (Total: 849 journals)
    - ANALYTICAL CHEMISTRY (50 journals)
    - CHEMISTRY (598 journals)
    - CRYSTALLOGRAPHY (22 journals)
    - ELECTROCHEMISTRY (25 journals)
    - INORGANIC CHEMISTRY (42 journals)
    - ORGANIC CHEMISTRY (45 journals)
    - PHYSICAL CHEMISTRY (67 journals)

CHEMISTRY (598 journals)                  1 2 3 | Last

Showing 1 - 200 of 735 Journals sorted alphabetically
2D Materials     Hybrid Journal   (Followers: 8)
Accreditation and Quality Assurance: Journal for Quality, Comparability and Reliability in Chemical Measurement     Hybrid Journal   (Followers: 26)
ACS Catalysis     Full-text available via subscription   (Followers: 32)
ACS Chemical Neuroscience     Full-text available via subscription   (Followers: 17)
ACS Combinatorial Science     Full-text available via subscription   (Followers: 23)
ACS Macro Letters     Full-text available via subscription   (Followers: 23)
ACS Medicinal Chemistry Letters     Full-text available via subscription   (Followers: 39)
ACS Nano     Full-text available via subscription   (Followers: 227)
ACS Photonics     Full-text available via subscription   (Followers: 11)
ACS Synthetic Biology     Full-text available via subscription   (Followers: 21)
Acta Chemica Iasi     Open Access   (Followers: 2)
Acta Chimica Sinica     Full-text available via subscription   (Followers: 1)
Acta Chimica Slovaca     Open Access   (Followers: 1)
Acta Chromatographica     Full-text available via subscription   (Followers: 9)
Acta Facultatis Medicae Naissensis     Open Access  
Acta Metallurgica Sinica (English Letters)     Hybrid Journal   (Followers: 5)
Acta Scientifica Naturalis     Open Access   (Followers: 2)
adhäsion KLEBEN & DICHTEN     Hybrid Journal   (Followers: 5)
Adhesion Adhesives & Sealants     Hybrid Journal   (Followers: 7)
Adsorption Science & Technology     Full-text available via subscription   (Followers: 5)
Advanced Functional Materials     Hybrid Journal   (Followers: 50)
Advanced Science Focus     Free   (Followers: 3)
Advances in Chemical Engineering and Science     Open Access   (Followers: 53)
Advances in Chemical Science     Open Access   (Followers: 13)
Advances in Chemistry     Open Access   (Followers: 14)
Advances in Colloid and Interface Science     Full-text available via subscription   (Followers: 18)
Advances in Drug Research     Full-text available via subscription   (Followers: 22)
Advances in Enzyme Research     Open Access   (Followers: 9)
Advances in Fluorine Science     Full-text available via subscription   (Followers: 8)
Advances in Fuel Cells     Full-text available via subscription   (Followers: 15)
Advances in Heterocyclic Chemistry     Full-text available via subscription   (Followers: 8)
Advances in Materials Physics and Chemistry     Open Access   (Followers: 19)
Advances in Nanoparticles     Open Access   (Followers: 14)
Advances in Organometallic Chemistry     Full-text available via subscription   (Followers: 15)
Advances in Polymer Science     Hybrid Journal   (Followers: 41)
Advances in Protein Chemistry     Full-text available via subscription   (Followers: 18)
Advances in Protein Chemistry and Structural Biology     Full-text available via subscription   (Followers: 19)
Advances in Quantum Chemistry     Full-text available via subscription   (Followers: 5)
Advances in Science and Technology     Full-text available via subscription   (Followers: 12)
African Journal of Bacteriology Research     Open Access  
African Journal of Chemical Education     Open Access   (Followers: 2)
African Journal of Pure and Applied Chemistry     Open Access   (Followers: 7)
Agrokémia és Talajtan     Full-text available via subscription   (Followers: 2)
Alkaloids: Chemical and Biological Perspectives     Full-text available via subscription   (Followers: 3)
AMB Express     Open Access   (Followers: 1)
Ambix     Hybrid Journal   (Followers: 3)
American Journal of Biochemistry and Biotechnology     Open Access   (Followers: 67)
American Journal of Biochemistry and Molecular Biology     Open Access   (Followers: 14)
American Journal of Chemistry     Open Access   (Followers: 26)
American Journal of Plant Physiology     Open Access   (Followers: 13)
American Mineralogist     Hybrid Journal   (Followers: 13)
Analyst     Full-text available via subscription   (Followers: 38)
Angewandte Chemie     Hybrid Journal   (Followers: 164)
Angewandte Chemie International Edition     Hybrid Journal   (Followers: 212)
Annales UMCS, Chemia     Open Access   (Followers: 1)
Annals of Clinical Chemistry and Laboratory Medicine     Open Access   (Followers: 1)
Annual Reports in Computational Chemistry     Full-text available via subscription   (Followers: 3)
Annual Reports Section A (Inorganic Chemistry)     Full-text available via subscription   (Followers: 3)
Annual Reports Section B (Organic Chemistry)     Full-text available via subscription   (Followers: 8)
Annual Review of Chemical and Biomolecular Engineering     Full-text available via subscription   (Followers: 12)
Annual Review of Food Science and Technology     Full-text available via subscription   (Followers: 14)
Anti-Infective Agents     Hybrid Journal   (Followers: 3)
Antiviral Chemistry and Chemotherapy     Hybrid Journal  
Applied Organometallic Chemistry     Hybrid Journal   (Followers: 7)
Applied Spectroscopy     Full-text available via subscription   (Followers: 23)
Applied Surface Science     Hybrid Journal   (Followers: 28)
Arabian Journal of Chemistry     Open Access   (Followers: 6)
ARKIVOC     Open Access   (Followers: 2)
Asian Journal of Biochemistry     Open Access   (Followers: 1)
Atomization and Sprays     Full-text available via subscription   (Followers: 3)
Australian Journal of Chemistry     Hybrid Journal   (Followers: 7)
Autophagy     Hybrid Journal   (Followers: 2)
Avances en Quimica     Open Access   (Followers: 1)
Biochemical Pharmacology     Hybrid Journal   (Followers: 10)
Biochemistry     Full-text available via subscription   (Followers: 285)
Biochemistry Insights     Open Access   (Followers: 5)
Biochemistry Research International     Open Access   (Followers: 6)
BioChip Journal     Hybrid Journal  
Bioinorganic Chemistry and Applications     Open Access   (Followers: 9)
Bioinspired Materials     Open Access   (Followers: 5)
Biointerface Research in Applied Chemistry     Open Access   (Followers: 2)
Biointerphases     Open Access   (Followers: 1)
Biology, Medicine, & Natural Product Chemistry     Open Access   (Followers: 1)
Biomacromolecules     Full-text available via subscription   (Followers: 19)
Biomass Conversion and Biorefinery     Partially Free   (Followers: 10)
Biomedical Chromatography     Hybrid Journal   (Followers: 6)
Biomolecular NMR Assignments     Hybrid Journal   (Followers: 3)
BioNanoScience     Partially Free   (Followers: 4)
Bioorganic & Medicinal Chemistry     Hybrid Journal   (Followers: 110)
Bioorganic & Medicinal Chemistry Letters     Hybrid Journal   (Followers: 93)
Bioorganic Chemistry     Hybrid Journal   (Followers: 10)
Biopolymers     Hybrid Journal   (Followers: 18)
Biosensors     Open Access   (Followers: 2)
Biotechnic and Histochemistry     Hybrid Journal   (Followers: 1)
Bitácora Digital     Open Access  
Boletin de la Sociedad Chilena de Quimica     Open Access  
Bulletin of the Chemical Society of Ethiopia     Open Access   (Followers: 2)
Bulletin of the Chemical Society of Japan     Full-text available via subscription   (Followers: 24)
Bulletin of the Korean Chemical Society     Hybrid Journal   (Followers: 1)
C - Journal of Carbon Research     Open Access   (Followers: 3)
Cakra Kimia (Indonesian E-Journal of Applied Chemistry)     Open Access  
Canadian Association of Radiologists Journal     Full-text available via subscription   (Followers: 2)
Canadian Journal of Chemistry     Hybrid Journal   (Followers: 10)
Canadian Mineralogist     Full-text available via subscription   (Followers: 3)
Carbohydrate Research     Hybrid Journal   (Followers: 26)
Carbon     Hybrid Journal   (Followers: 67)
Catalysis for Sustainable Energy     Open Access   (Followers: 6)
Catalysis Reviews: Science and Engineering     Hybrid Journal   (Followers: 8)
Catalysis Science and Technology     Free   (Followers: 6)
Catalysis Surveys from Asia     Hybrid Journal   (Followers: 3)
Catalysts     Open Access   (Followers: 7)
Cellulose     Hybrid Journal   (Followers: 7)
Cereal Chemistry     Full-text available via subscription   (Followers: 4)
ChemBioEng Reviews     Full-text available via subscription   (Followers: 1)
ChemCatChem     Hybrid Journal   (Followers: 8)
Chemical and Engineering News     Free   (Followers: 12)
Chemical Bulletin of Kazakh National University     Open Access  
Chemical Communications     Full-text available via subscription   (Followers: 70)
Chemical Engineering Research and Design     Hybrid Journal   (Followers: 23)
Chemical Research in Chinese Universities     Hybrid Journal   (Followers: 3)
Chemical Research in Toxicology     Full-text available via subscription   (Followers: 19)
Chemical Reviews     Full-text available via subscription   (Followers: 174)
Chemical Science     Open Access   (Followers: 21)
Chemical Technology     Open Access   (Followers: 16)
Chemical Vapor Deposition     Hybrid Journal   (Followers: 5)
Chemical Week     Full-text available via subscription   (Followers: 8)
Chemie in Unserer Zeit     Hybrid Journal   (Followers: 55)
Chemie-Ingenieur-Technik (Cit)     Hybrid Journal   (Followers: 25)
ChemInform     Hybrid Journal   (Followers: 8)
Chemistry & Biodiversity     Hybrid Journal   (Followers: 6)
Chemistry & Biology     Full-text available via subscription   (Followers: 30)
Chemistry & Industry     Hybrid Journal   (Followers: 5)
Chemistry - A European Journal     Hybrid Journal   (Followers: 150)
Chemistry - An Asian Journal     Hybrid Journal   (Followers: 15)
Chemistry and Materials Research     Open Access   (Followers: 18)
Chemistry Central Journal     Open Access   (Followers: 4)
Chemistry Education Research and Practice     Free   (Followers: 5)
Chemistry in Education     Open Access   (Followers: 9)
Chemistry International     Hybrid Journal   (Followers: 2)
Chemistry Letters     Full-text available via subscription   (Followers: 45)
Chemistry of Materials     Full-text available via subscription   (Followers: 243)
Chemistry of Natural Compounds     Hybrid Journal   (Followers: 9)
Chemistry World     Full-text available via subscription   (Followers: 22)
Chemistry-Didactics-Ecology-Metrology     Open Access  
ChemistryOpen     Open Access   (Followers: 2)
Chemkon - Chemie Konkret, Forum Fuer Unterricht Und Didaktik     Hybrid Journal  
Chemoecology     Hybrid Journal   (Followers: 2)
Chemometrics and Intelligent Laboratory Systems     Hybrid Journal   (Followers: 15)
Chemosensors     Open Access  
ChemPhysChem     Hybrid Journal   (Followers: 9)
ChemPlusChem     Hybrid Journal   (Followers: 2)
ChemTexts     Hybrid Journal  
CHIMIA International Journal for Chemistry     Full-text available via subscription   (Followers: 2)
Chinese Journal of Chemistry     Hybrid Journal   (Followers: 6)
Chinese Journal of Polymer Science     Hybrid Journal   (Followers: 10)
Chromatographia     Hybrid Journal   (Followers: 24)
Chromatography Research International     Open Access   (Followers: 7)
Clay Minerals     Full-text available via subscription   (Followers: 9)
Cogent Chemistry     Open Access  
Colloid and Interface Science Communications     Open Access  
Colloid and Polymer Science     Hybrid Journal   (Followers: 10)
Colloids and Surfaces B: Biointerfaces     Hybrid Journal   (Followers: 8)
Combinatorial Chemistry & High Throughput Screening     Hybrid Journal   (Followers: 3)
Combustion Science and Technology     Hybrid Journal   (Followers: 18)
Comments on Inorganic Chemistry: A Journal of Critical Discussion of the Current Literature     Hybrid Journal   (Followers: 2)
Composite Interfaces     Hybrid Journal   (Followers: 6)
Comprehensive Chemical Kinetics     Full-text available via subscription   (Followers: 2)
Comptes Rendus Chimie     Full-text available via subscription  
Comptes Rendus Physique     Full-text available via subscription   (Followers: 1)
Computational and Theoretical Chemistry     Hybrid Journal   (Followers: 9)
Computational Biology and Chemistry     Hybrid Journal   (Followers: 12)
Computational Chemistry     Open Access   (Followers: 2)
Computers & Chemical Engineering     Hybrid Journal   (Followers: 9)
Coordination Chemistry Reviews     Full-text available via subscription   (Followers: 2)
Copernican Letters     Open Access  
Critical Reviews in Biochemistry and Molecular Biology     Hybrid Journal   (Followers: 5)
Crystal Structure Theory and Applications     Open Access   (Followers: 3)
CrystEngComm     Full-text available via subscription   (Followers: 11)
Current Catalysis     Hybrid Journal   (Followers: 2)
Current Metabolomics     Hybrid Journal   (Followers: 5)
Current Opinion in Colloid & Interface Science     Hybrid Journal   (Followers: 9)
Current Research in Chemistry     Open Access   (Followers: 8)
Current Science     Open Access   (Followers: 56)
Dalton Transactions     Full-text available via subscription   (Followers: 19)
Detection     Open Access   (Followers: 2)
Developments in Geochemistry     Full-text available via subscription   (Followers: 2)
Diamond and Related Materials     Hybrid Journal   (Followers: 12)
Dislocations in Solids     Full-text available via subscription  
Doklady Chemistry     Hybrid Journal  
Drying Technology: An International Journal     Hybrid Journal   (Followers: 4)
Eclética Química     Open Access   (Followers: 1)
Ecological Chemistry and Engineering S     Open Access   (Followers: 4)
Ecotoxicology and Environmental Contamination     Open Access  
Educación Química     Open Access   (Followers: 1)
Education for Chemical Engineers     Hybrid Journal   (Followers: 5)
EJNMMI Radiopharmacy and Chemistry     Open Access  
Elements     Full-text available via subscription   (Followers: 2)
Environmental Chemistry     Hybrid Journal   (Followers: 9)
Environmental Chemistry Letters     Hybrid Journal   (Followers: 4)
Environmental Science & Technology Letters     Full-text available via subscription   (Followers: 5)

        1 2 3 | Last

Journal Cover Arabian Journal of Chemistry
  [SJR: 0.512]   [H-I: 20]   [6 followers]  Follow
    
  This is an Open Access Journal Open Access journal
   ISSN (Print) 1878-5352
   Published by Elsevier Homepage  [3042 journals]
  • The chemical composition on fingerprint of Glandora diffusa and its
           biological properties

    • Authors: Fátima Fernandes; Paula B. Andrade; Federico Ferreres; Angel Gil-Izquierdo; Isabel Sousa-Pinto; Patrícia Valentão
      Pages: 583 - 595
      Abstract: Publication date: July 2017
      Source:Arabian Journal of Chemistry, Volume 10, Issue 5
      Author(s): Fátima Fernandes, Paula B. Andrade, Federico Ferreres, Angel Gil-Izquierdo, Isabel Sousa-Pinto, Patrícia Valentão
      Glandora diffusa (Lag.) D.C. Thomas is a medicinal species widely consumed as herbal tea. Despite being commercialized by several herbs distributors, the genuineness of the marketed product is unknown. Among secondary metabolites with proven taxonomic interest, the phenolics profile was herein used as “fingerprint” of three commercial G. diffusa samples. Furthermore, the knowledge on the composition of this species was extended and its amino acids, fatty acids, sterols and triterpenes profiles were studied for the first time. The phenolics profile was characterized by HPLC-DAD. All other metabolites were determined by GC–MS. Despite similar qualitative profiles, significant quantitative differences were observed among the three samples. Their potential as antioxidant and anti-Alzheimer and cytotoxicity was evaluated and relationship between chemical composition and activities was considered. Ethanolic extracts showed a potent dose-dependent response against DPPH , a mild inhibitory effect on both acetylcholinesterase (AChE) and butyrylcholinesterase (BuChE) and to be toxic to both human colorectal (Caco-2) and gastric adenocarcinoma (AGS) cells only for high concentrations. This work covers interdisciplinary aspects in the pharmaceutical and biomedical sciences, by focusing on metabolic profiling and quality assurance of a medicinal species used in folk medicine. The results improve the knowledge on G. diffusa and encourage its use, not only as herbal tea, as it is traditionally consumed, but also in pharmaceutical preparations, ethanol being a cheap and feasible solvent to recover its bioactive components.

      PubDate: 2017-06-20T05:49:34Z
      DOI: 10.1016/j.arabjc.2015.01.012
       
  • Electrochemical detection of lead (II) at
           bismuth/Poly(1,8-diaminonaphthalene) modified carbon paste electrode

    • Authors: Fatima Ezzahra Salih; Aicha Ouarzane; Mama El Rhazi
      Pages: 596 - 603
      Abstract: Publication date: July 2017
      Source:Arabian Journal of Chemistry, Volume 10, Issue 5
      Author(s): Fatima Ezzahra Salih, Aicha Ouarzane, Mama El Rhazi
      A new sensor based on carbon paste electrode modified with Poly(1,8-diaminonaphthalene) and bismuth film (Bi-Poly1,8-DAN/CPE) was prepared and characterized with cyclic voltammetry and electrochemical impedance spectroscopy. The sensor was found to exhibit an electroactivity toward the sensing of lead using square wave voltammetry in acidic medium. Various operational parameters, such as concentration of Bi(III), square wave voltammetric parameters, deposition potential and deposition time were investigated. Under the optimized conditions, a linear range was achieved over concentration range from 0.5μgL−1 to 50μgL−1, with a detection limit of 0.3μgL−1 offering a good repeatability and reproducibility. Finally, the Bi-Poly1,8-DAN/CPE was applied for the analysis of lead in water samples with satisfactory results.

      PubDate: 2017-06-20T05:49:34Z
      DOI: 10.1016/j.arabjc.2015.08.021
       
  • Simultaneous determination of gatifloxacin and prednisolone acetate in
           ophthalmic formulation using first-order UV derivative spectroscopy

    • Authors: Rúbia A. Sversut; Isabella C. Alcântara; Aline M. Rosa; Adriano C.M. Baroni; Patrik O. Rodrigues; Anil K. Singh; Marcos S. Amaral; Nájla M. Kassab
      Pages: 604 - 610
      Abstract: Publication date: July 2017
      Source:Arabian Journal of Chemistry, Volume 10, Issue 5
      Author(s): Rúbia A. Sversut, Isabella C. Alcântara, Aline M. Rosa, Adriano C.M. Baroni, Patrik O. Rodrigues, Anil K. Singh, Marcos S. Amaral, Nájla M. Kassab
      A simple method for simultaneous determination of gatifloxacin and prednisolone acetate in ophthalmic formulation was developed and validated using UV spectrophotometry. Gatifloxacin and prednisolone acetate were quantified using the first-order derivative of the UV spectra. The proposed method was validated according to the guidelines of the International Conference on Harmonization and the Association of Official Analytical Chemists International. The measurements were made in acetonitrile/water (70:30 v/v) at 348nm for gatifloxacin and at 263nm for prednisolone acetate. The calibration curves were linear in the concentration range of 3–21μgmL−1 for gatifloxacin and 6–42μgmL−1 for prednisolone acetate with Sandell’s sensitivities of 0.349μgcm−2 and 0.402μgcm−2, respectively. The mean recovery and the limit of quantification for gatifloxacin were 99.76±0.41% and 1.11μgmL−1 and for prednisolone acetate were 99.52±0.87% and 0.55μgmL−1, respectively. The method was precise, with a relative standard deviation of less than 2.50% for both drugs. For robustness, the factors analyzed did not significantly affect the quantification of gatifloxacin and prednisolone acetate. The results of the validated method did not differ significantly from high-performance liquid chromatography (HPLC), which was previously developed and validated for the same drugs. In this form, the method was suitable for routine analysis of gatifloxacin and prednisolone acetate in their combined dosage form in ophthalmic formulations.

      PubDate: 2017-06-20T05:49:34Z
      DOI: 10.1016/j.arabjc.2014.11.026
       
  • Adsorption performance of magnesium/aluminum layered double hydroxide
           nanoparticles for metronidazole from aqueous solution

    • Authors: Mohammad Noori Sepehr; Tariq J. Al-Musawi; Esmail Ghahramani; Hossein Kazemian; Mansur Zarrabi
      Pages: 611 - 623
      Abstract: Publication date: July 2017
      Source:Arabian Journal of Chemistry, Volume 10, Issue 5
      Author(s): Mohammad Noori Sepehr, Tariq J. Al-Musawi, Esmail Ghahramani, Hossein Kazemian, Mansur Zarrabi
      Magnesium/aluminum layered double hydroxide (LDH) nanoparticles were synthesized by hydrolyzing urea and used to remove metronidazole (MN) from aqueous solution. The surface morphology images of the LDH nanoparticles showed that the adsorbent surface consisted of hexagonal nanosheets with a diameter of 200–1000nm. The MN removal efficiency was strongly dependent on the solution pH ranging from 3 to 9. The addition of nitrate, sulfate, and carbonate did not remarkably affect MN adsorption, while hardness slightly improved MN removal efficiency. The adsorption isotherm data could be well described using the Sips equation. The analysis of kinetic data showed that the adsorption of MN onto LDH closely followed the Avrami model and that several kinetic processes may control the rate of sorption. The adsorption process was non-spontaneous and exothermic in nature. The maximum Langmuir adsorption capacity was 62.804mg/g, demonstrating that LDH is an efficient adsorbent that can be used for the removal of MN compounds.

      PubDate: 2017-06-20T05:49:34Z
      DOI: 10.1016/j.arabjc.2016.07.003
       
  • Accessing anti-human lung tumor cell line (A549) potential of newer
           3,5-disubstituted pyrazoline analogs

    • Authors: Zhi-Hui Lu; Xi-Juan Gu; Ke-Zhi Shi; Xuan Li; Dian-Dian Chen; Li Chen
      Pages: 624 - 630
      Abstract: Publication date: July 2017
      Source:Arabian Journal of Chemistry, Volume 10, Issue 5
      Author(s): Zhi-Hui Lu, Xi-Juan Gu, Ke-Zhi Shi, Xuan Li, Dian-Dian Chen, Li Chen
      A new series of pyrazoline analogs was furnished and evaluated for their in vitro anticancer efficacies against human non-small-cell lung cancer cell line A549. Claisen–Schmidt condensation between intended acetophenone compound and different substituted aldehydes resulted in the formation of corresponding chalcones which were cyclized using hydrazine hydrate to yield the final pyrazoline intermediates. α-Naphthyl isothiocyanate was prepared from benzoyl chloride and α-naphthyl amine through α-naphthyl thiourea to react with pyrazoline intermediates to furnish title compounds 10a–h, disubstituted pyrazolines in good yields and purity. All final analogs were screened for their anticancer potential using MTT and SRB assay in addition to the determination of their cytotoxic nature. Final compounds revealed a good deal of potential against A549 cell lines with reasonable level of cytotoxic nature, particularly analogs with fluorine and thiomethyl and methoxy functional group demonstrated good potencies. SAR showed that the activity level varied with the variation in the nature of substituent present on the phenyl ring attached to the C-4 position of the pyrazoline ring. This study revealed the efficacies of presented molecules for further development as anticancer congeners. The structures of final compounds were confirmed with the aid of FT-IR, 1H NMR, 13C NMR spectroscopy and CHN analysis.

      PubDate: 2017-06-20T05:49:34Z
      DOI: 10.1016/j.arabjc.2014.11.002
       
  • Synthesis and utilization of poly (methylmethacrylate) nanocomposites
           based on modified montmorillonite

    • Authors: Ahmed M. Youssef; F.M. Malhat; A.A. Abdel Hakim; Imre Dekany
      Pages: 631 - 642
      Abstract: Publication date: July 2017
      Source:Arabian Journal of Chemistry, Volume 10, Issue 5
      Author(s): Ahmed M. Youssef, F.M. Malhat, A.A. Abdel Hakim, Imre Dekany
      Poly (methylmethacrylate) nanocomposite was prepared via in-situ emulsion polymerization (PMMA/Mt-CTA). The modified montmorillonite (Mt-CTA) is used as hosts for the preparation of poly (methylmethacrylate) nanocomposites with basal distance 1.95nm. Moreover, exfoliated nanocomposite was characterized by X-ray diffraction (XRD), transmission electron microscope (TEM), thermal gravimetric analysis (TGA), and differential scanning calorimetry (DSC). The fashioned nanocomposites exhibited better thermal stability than pristine PMMA which make it suitable for packaging applications. Furthermore, this nanocomposite reveals tremendous affinity for removing pesticides from aquatic solutions. The data obtained from GC/ECD gas liquid chromatography illustrated that the removal efficiency of PMMA/Mt-CTA nanocomposites for organochlorine pesticides (OCPs) varied from 73.65% to 99.36% that make it as a new method for water treatment. Also, the antimicrobial activity of the Mt-CTA and PMMA/Mt-CTA nanocomposites was evaluated by the inhibitory zone tests and revealed good activity against Escherichia coli and Staphylococcus aureus, which makes it suitable materials for packaging applications.

      PubDate: 2017-06-20T05:49:34Z
      DOI: 10.1016/j.arabjc.2015.02.017
       
  • Synthesis and fluorescence of new 3-biphenylpyrrolo[1,2-c]pyrimidines

    • Authors: Marian-Laurentiu Tatu; Emilian Georgescu; Cristian Boscornea; Marcel-Mirel Popa; Eleonora-Mihaela Ungureanu
      Pages: 643 - 652
      Abstract: Publication date: July 2017
      Source:Arabian Journal of Chemistry, Volume 10, Issue 5
      Author(s): Marian-Laurentiu Tatu, Emilian Georgescu, Cristian Boscornea, Marcel-Mirel Popa, Eleonora-Mihaela Ungureanu
      New pyrrolo[1,2-c]pyrimidines derivates having a biphenyl moiety at position 3 have been synthesized by 1,3-dipolar cycloaddition of their corresponding N-ylides with activated alkynes. FTIR, 1H and 13C NMR spectroscopy and elemental analysis have been used to characterize the structures of the new nine pyrrolo[1,2-c]pyrimidine derivates. Absorption and fluorescence spectra have been recorded. The appropriate solvent for the photoluminescence properties of the studied compounds has been found to be chloroform:acetonitrile mixture (1:1). The main spectral features such as molar extinction coefficients (ε), Stokes shifts, quantum yields using quinine sulphate as standard, fluorescence quenching in the presence of benzoquinone and Stern-Volmer constants have been calculated. The substituent effects on intensity of absorption, maximum absorbance wavelengths and fluorescence parameters have been discussed. The highest quantum yield value was found for ethyl 3-(4-biphenylyl)-7-(3,4-dimethoxybenzoyl)pyrrolo[1,2-c]pyrimidine-5-carboxylate (0.55). The obtained results suggest that the studied compounds are promising candidates for future study in order to evaluate their use in practical applications in fluorescent chemical sensors.

      PubDate: 2017-06-20T05:49:34Z
      DOI: 10.1016/j.arabjc.2016.09.013
       
  • Electrochemical measurements for the corrosion inhibition of mild steel in
           1M hydrochloric acid by using an aromatic hydrazide derivative

    • Authors: P. Preethi Kumari; Prakash Shetty; Suma A. Rao
      Pages: 653 - 663
      Abstract: Publication date: July 2017
      Source:Arabian Journal of Chemistry, Volume 10, Issue 5
      Author(s): P. Preethi Kumari, Prakash Shetty, Suma A. Rao
      The influence of an aromatic hydrazide derivative, 2-(3,4,5-trimethoxybenzylidene) hydrazinecarbothioamide (TMBHC) as corrosion inhibitor on mild steel in 1M hydrochloric acid was studied by Tafel polarization and electrochemical impedance spectroscopy (EIS) technique. The results showed that the inhibition efficiency (% IE) of TMBHC increased with increasing inhibitor concentrations and also with increase in temperatures. TMBHC acted as a mixed type of inhibitor and its adsorption on mild steel surface was found to follow Langmuir’s adsorption isotherm. The evaluation of thermodynamic and activation parameters indicated that the adsorption of TMBHC takes place through chemisorption. The formation of protective film was further confirmed by scanning electron microscopy (SEM).

      PubDate: 2017-06-20T05:49:34Z
      DOI: 10.1016/j.arabjc.2014.09.005
       
  • Effects of aniline concentrations on the electrical and mechanical
           properties of polyaniline polyvinyl alcohol blends

    • Authors: J. Bhadra; N.J. Al-Thani; N.K. Madi; M.A. Al-Maadeed
      Pages: 664 - 672
      Abstract: Publication date: July 2017
      Source:Arabian Journal of Chemistry, Volume 10, Issue 5
      Author(s): J. Bhadra, N.J. Al-Thani, N.K. Madi, M.A. Al-Maadeed
      In this work, we present an exclusive study on the effect of the feeding ratio of the monomer (aniline) on the structural, thermal, mechanical and electrical properties of polyaniline (PANI) polyvinyl alcohol (PVA) blends. The films obtained from the blends are characterised to determine their surface properties and structural morphology (elemental analysis, SEM and FTIR), thermal properties (TGA and DSC) and optical properties (UV–Vis spectroscopy). We study the effects of aniline on the mechanical and electrical properties of the composites by performing tensile, four probe and A.C. conductivity measurements, respectively. The SEM images reveal a heterogeneous distribution of conductive PANI particles in the continuous PVA matrix. During this experiment, the tensile strength of the blend films is maintained with an increase in the amount of aniline (up to 25wt%), and this behaviour is attributed to intermolecular hydrogen bonding between PANI and PVA in the presence of the surfactant DBSA. The potential attraction of the experiment lies in the nature of the conductivity (of the blend films), which is found to increase from 10−8 to 10−3 S/cm with a percolation threshold of 0.78wt%.

      PubDate: 2017-06-20T05:49:34Z
      DOI: 10.1016/j.arabjc.2015.04.017
       
  • In-gel detection of esterase-like albumin activity: Characterization of
           esterase-free sera albumin and its putative role as non-invasive biomarker
           of hepatic fibrosis

    • Authors: Areeba Ahmad; Riaz Ahmad
      Pages: 673 - 682
      Abstract: Publication date: July 2017
      Source:Arabian Journal of Chemistry, Volume 10, Issue 5
      Author(s): Areeba Ahmad, Riaz Ahmad
      Albumin is a globular and un-glycosylated multifunctional plasma protein and thus correlated with several human diseases. Owing to esterase contamination, albumin levels are usually misleading. In this study, we propose methodical accuracy for albumin estimation taking healthy and fibrotic rats. Liver fibrosis in rats was generated by N′-Nitrosodimethylamine (NDMA) (10mg/kg body weight) within three weeks followed by its confirmation through H&E and immunohistochemical staining for α-SMA expression. Animal sera were screened by native polyacrylamide gel electrophoresis (native-PAGE) (7.5%). In-gel esterase-like albumin activity was detected using α- and β-naphthyl acetate (5.58×10−3 mM; pH 7.5) as substrate. Sera albumin was purified from unstained PA gel-slices through electroelution. Subsequent to conformation of albumin purity by its molecular weight determination using SDS–PAGE (10%) and peptide mass fingerprinting by MALDI-TOF-MS, samples were treated with different concentrations of urea. Urea-treated albumins were screened for esterase activity, conformational change and, albumin levels by immunoblotting. Our results demonstrate that esterase-like albumin activity in rat sera albumin is located in domain-III. The esterase-like activity remains detectable up to 4M urea, which diminishes with increasing urea concentrations. Further, immunoblotting of urea-treated albumin samples displays a significant decline in purified protein bands, indicating hypoalbuminemia during hepatic fibrosis in rats. In conclusion, the present approach of albumin separation and estimation is of potential interest and may be recommended for diagnostic purposes.

      PubDate: 2017-06-20T05:49:34Z
      DOI: 10.1016/j.arabjc.2014.10.016
       
  • Efficient treatment of lead-containing wastewater by
           hydroxyapatite/chitosan nanostructures

    • Authors: Ahmad M. Mohammad; Taher A. Salah Eldin; Mohamed A. Hassan; Bahgat E. El-Anadouli
      Pages: 683 - 690
      Abstract: Publication date: July 2017
      Source:Arabian Journal of Chemistry, Volume 10, Issue 5
      Author(s): Ahmad M. Mohammad, Taher A. Salah Eldin, Mohamed A. Hassan, Bahgat E. El-Anadouli
      The development of hydroxyapatite nanorods (nHAp) and hydroxyapatite/chitosan nanocomposite (nHApCs) was sought as potential sorbents for the removal of lead ions from aqueous lead-containing solutions in a batch adsorption experiment. The high resolution transmission electron microscopy, energy dispersive X-ray analysis, X-ray diffraction, Fourier transform infrared spectrophotometry and Zeta potential measurements were all combined to reveal the morphology, composition, crystal structure, functionality and stability of the prepared sorbents. The equilibrium concentration of Pb2+ ions was identified by the atomic absorption spectrophotometry. The kinetics of the sorption process was investigated together with the influence of initial lead ions concentration, sorbent dosage and solution pH on the sorption capacity. The sorption process followed pseudo-second-order kinetics, where 20min was quite enough to attain equilibrium. Two models of adsorption isotherms (Freundlich and Langmuir) were employed to correlate the data in order to understand the adsorption mechanism. Interestingly, in one of the experiments, for a 200mL solution (pH=5.6) containing 100ppm lead ions, a sorbent dosage of 0.4g nHAp could achieve a complete removal for lead ions. However, typically, the sorption capacities of nHAp and nHApCs to lead ions were 180 and 190mg/g respectively, which appear excellent for lead removal.
      Graphical abstract image

      PubDate: 2017-06-20T05:49:34Z
      DOI: 10.1016/j.arabjc.2014.12.016
       
  • Morinda citrifolia (Noni): A comprehensive review on its industrial uses,
           pharmacological activities, and clinical trials

    • Authors: Reem Abou Assi; Yusrida Darwis; Ibrahim M. Abdulbaqi; Arshad A. khan; Lim Vuanghao; M.H. Laghari
      Pages: 691 - 707
      Abstract: Publication date: July 2017
      Source:Arabian Journal of Chemistry, Volume 10, Issue 5
      Author(s): Reem Abou Assi, Yusrida Darwis, Ibrahim M. Abdulbaqi, Arshad A. khan, Lim Vuanghao, M.H. Laghari
      Traditional medical practitioners in Hawaii and Polynesia have used Morinda citrifolia L. (Noni) for centuries to cure or prevent varieties of illnesses. The popularity of M. citrifolia as a dietary supplement, a food functional ingredient, or as a natural health enhancer is increasing throughout the world. M. citrifolia contains phytochemicals that own antibacterial, antiviral, antifungal, antitumor, anthelminthic, analgesic, hypotensive, anti-inflammatory and immune enhancing effects. Moreover, the increasing vogue of M. citrifolia has attracted industries to employ it as a part of various products and for wide applications such as a natural source of medicines and chemical reagents as well as a green insecticidal. The wide spread of M. citrifolia in tropical climate of the globe, from USA to Brazil reaching to Tahiti, Malaysia and Australia, contributed in enriching its uses and potentials due to the variation in harvest locations. M. citrifolia parts including fruits, seeds, barks, leaves, and flowers are utilized on their own for individual nutritional and therapeutical values, however, the fruit is considered to contain the most valuable chemical compounds. This review discusses in details the industrial uses and the pharmacological activities of M. citrifolia fruit, seed, leaf and root, along with their isolated phytochemical compounds, through describing the conducted in vitro and in vivo studies as well as clinical data.

      PubDate: 2017-06-20T05:49:34Z
      DOI: 10.1016/j.arabjc.2015.06.018
       
  • Probing the molecular orientation of chemically polymerized
           polythiophene-polyrotaxane via solid state NMR

    • Authors: Mujeeb Khan; Gunther Brunklaus; Shahzada Ahmad
      Pages: 708 - 714
      Abstract: Publication date: July 2017
      Source:Arabian Journal of Chemistry, Volume 10, Issue 5
      Author(s): Mujeeb Khan, Gunther Brunklaus, Shahzada Ahmad
      Polyrotaxanes have attracted significant attention of scientific community and are being explored towing to its electro-optical properties. The orientation and the molecular structure of polyrotaxanes influence its final properties. Thus a, detail understanding of the structure of such compounds at the molecular level will provide an opportunity to further tune and optimize their properties. Here chemically polymerized polythiophene polyrotaxane i.e. Thiophene [2]Rotaxane which is the rotaxane like compound consisting of several macrocycle, was studied in the powdered form. This allowed us to investigate the molecular structure of polyrotaxane and to obtain the detail insights into its structure property relationship via solid state NMR. The as-obtained polymer has also been characterized via various other techniques including UV spectroscopy, solution NMR and so on. We elucidated the structure of the Thiophene [2]Rotaxane monomer remained intact even after polymerization.

      PubDate: 2017-06-20T05:49:34Z
      DOI: 10.1016/j.arabjc.2017.01.003
       
  • Facile and efficient synthesis of benzoxazole derivatives using novel
           catalytic activity of PEG-SO3H

    • Authors: Rupesh V. Chikhale; Amit M. Pant; Sunil S. Menghani; Pankaj G. Wadibhasme; Pramod B. Khedekar
      Pages: 715 - 725
      Abstract: Publication date: July 2017
      Source:Arabian Journal of Chemistry, Volume 10, Issue 5
      Author(s): Rupesh V. Chikhale, Amit M. Pant, Sunil S. Menghani, Pankaj G. Wadibhasme, Pramod B. Khedekar
      A highly efficient, simple and rapid method for the preparation of various 2-aminobenzoxazoles and other benzoxazole derivatives using a catalytic amount of poly (ethylene glycol)-bound sulfonic acid (PEG-SO3H) is described. PEG-SO3H is found to be an economical and reusable catalyst with low catalytic loading. The percent yield was found to be satisfactory, experimental set up and purification of final products are facile and easy.

      PubDate: 2017-06-20T05:49:34Z
      DOI: 10.1016/j.arabjc.2014.06.011
       
  • Influence of sonication process parameters to the state of liquid
           concentration of extracted rebaudioside A from Stevia (Stevia rebaudiana
           bertoni) leaves

    • Authors: Mohammed Abdalbasit A. Gasmalla; Ruijin Yang; Abubakr Musa; Xiao Hua; Fayin Ye
      Pages: 726 - 731
      Abstract: Publication date: July 2017
      Source:Arabian Journal of Chemistry, Volume 10, Issue 5
      Author(s): Mohammed Abdalbasit A. Gasmalla, Ruijin Yang, Abubakr Musa, Xiao Hua, Fayin Ye
      The purpose of this work was to develop a process to obtain Stevia extract of a better quality and quantity under influence of ultrasound technique. The chemical compositions, anti-nutritional factor and heavy metals of raw material were tested firstly in (ww− 1) in our previous work. The extraction process was assisted by ultrasonication at power 360W for 12min using three different types of solvents (water, ethanol and isopropyl alcohol) in different concentrations, that is, 10, 20, 30, 40, 50, and 60% (vv− 1) to optimize the extraction process. Stevia leaves extractions, analyzed by HPLC, indicated that isopropyl alcohol (60% vv− 1) gave the highest rebaudioside A yield (35g100g− 1). This optimum concentration was used in the next set of experiments to optimize ultrasonic power and time. Optimum applied power and sonication time was found 18min and 480W, respectively. The extraction yield obtained under optimum process conditions for water, ethanol and isopropyl alcohol were 32.79, 33.85 and 37.10 (g100g− 1), respectively. Compared to classical methods like maceration and heat extraction, the utilization of ultrasound-assisted extraction proved to be a much simpler and efficient way to obtain rebaudioside A from Stevia rebaudiana leaves.

      PubDate: 2017-06-20T05:49:34Z
      DOI: 10.1016/j.arabjc.2014.06.012
       
  • Evaluation of invitro α-amylase and α-glucosidase inhibitory potential
           of N2O2 schiff base Zn complex

    • Authors: Kannan Balan; Periyasamy Ratha; Govindan Prakash; Periyasamy Viswanathamurthi; Sirichai Adisakwattana; Thayumanavan Palvannan
      Pages: 732 - 738
      Abstract: Publication date: July 2017
      Source:Arabian Journal of Chemistry, Volume 10, Issue 5
      Author(s): Kannan Balan, Periyasamy Ratha, Govindan Prakash, Periyasamy Viswanathamurthi, Sirichai Adisakwattana, Thayumanavan Palvannan
      The evaluation of the antioxidant, antibacterial and enzyme inhibition effects of N2O2 Schiff base Zn complex was investigated. The percentage scavenging activity of hydroxyl radical (IC50-0.21μg), ABTS (IC50-0.19μg) and DPPH (IC50-0.25μg) shows that ZnL complex had a potential antioxidant activity. The antibacterial activity of ZnL complex was evaluated. Results showed that MIC value against Staphylococcus aureus and Salmonella typhi was 100 and 200μg/ml, respectively. ZnL complex showed strong inhibition toward α-amylase and α-glucosidase with an IC50 value of 0.18 and 0.23μg, respectively. The inhibition mechanism was analyzed with LB and Dixon plots. The ZnL complex could be a mixed noncompetitive and noncompetitive inhibitor with K i values of 77.8 and 31.6μg for α-amylase and α-glucosidase, respectively. The preliminary assessment of ZnL complex showed that they can be used as an antioxidant, antibacterial and antidiabetic agents.

      PubDate: 2017-06-20T05:49:34Z
      DOI: 10.1016/j.arabjc.2014.07.002
       
  • Study of complex formation process between 4′-nitrobenzo-18-crown-6 and
           yttrium(III) cation in some binary mixed non-aqueous solvents using the
           conductometry method

    • Authors: Mahboobeh Vafi; Gholam Hossein Rounaghi; Mahmood Chamsaz
      Pages: 739 - 745
      Abstract: Publication date: July 2017
      Source:Arabian Journal of Chemistry, Volume 10, Issue 5
      Author(s): Mahboobeh Vafi, Gholam Hossein Rounaghi, Mahmood Chamsaz
      The complexation reaction between Y3+ cation and macrocyclic ligand, 4′-nitrobenzo-18-crown-6 (4′NB18C6), was studied in acetonitrile–methanol (AN–MeOH), acetonitrile–1,2-dichloroethane (AN–DCE), acetonitrile–dimethylformamide (AN–DMF) and acetonitrile–ethylacetate (AN–EtOAc) binary mixed solvent solutions at different temperatures using the conductometric method. The conductance data show that in most cases, the stoichiometry of the complex formed between 4′NB18C6 and Y3+ cation is 1:1 [M:L], but in the case of AN-DCE binary solution (mol% DCE=50) at 15, 25 and 35°C, a 2:1 [M2:L] and also a 2:2 [M2:L2] complexes are formed in solution. The results show that the stoichiometry of the complex formed between 4′NB18C6 and Y3+ cation changes with the composition of the mixed solvents and even with temperature. The stability constant of the 1:1 complex was determined using a computer program, GENPLOT. The stability order of (4′NB18C6.Y)3+ complex in pure studied solvents at 25°C was found to be: EtOAc>AN>MeOH>DMF and in the case of the mixed solvent solutions with 25mol percent of AN at 25°C was: AN-DCE>AN-EtOAc>AN-MeOH∼AN-DMF. The values of stability constant (log K f) of (4′NB18C6.Y)3+ complex which were obtained from conductometric data, show that the stability of the complex is not only affected by the nature and composition of the solvent system, but it is also influenced by the temperature. In all cases, a non-linear behavior is observed for changes of log K f of the (4′NB18C6.Y)3+ complex versus the composition of the binary mixed solvents. The values of standard thermodynamic quantities (ΔH°c and ΔS°c) for the complexation process which were obtained from temperature dependence of the stability constant of (4′NB18C6.Y)3+ complex, show that depending on the solvent system, in most cases, the complex is enthalpy and also entropy stabilized, but in some cases, it is stabilized or destabilized from these view points.

      PubDate: 2017-06-20T05:49:34Z
      DOI: 10.1016/j.arabjc.2014.07.003
       
  • Novel synthesis of biologically active indolo [3,2-C] isoquinoline
           derivatives

    • Authors: Prabhuodeyara M. Veeresha Sharma
      Pages: 746 - 749
      Abstract: Publication date: July 2017
      Source:Arabian Journal of Chemistry, Volume 10, Issue 5
      Author(s): Prabhuodeyara M. Veeresha Sharma
      Indole-2-carboxylates are refluxed with hydrazine hydrate to form 5-substituted-3-phenylindole-2-carboxyhydrazides. These are again converted to corresponding indole-2-carboxyazides. Azides are further converted into carbamates and finally these carbamates are cyclized to form the respective substituted 6H, 11H-indolo [3,2-C] isoquinolin-2-ones (1a–c). These (1a–c) were reacted with phosphorus pentasulfide in refluxing pyridine to yield the respective thiones (2a–c). These thiones (2a–c) on reaction with chloroacetic acid and sodium acetate in acetic acid under refluxing temperature for 5h yielded isoquinoline-thioacetic acids (3a–c). Compounds (3a–c) on reaction with orthopheneylene diamine dihydrochloride in ethylene glycol at refluxing temperature yielded substituted indolo [3,2-C] isoquinolin-2′-yl sulfanyl methylene benzimidazoles (4a–c).

      PubDate: 2017-06-20T05:49:34Z
      DOI: 10.1016/j.arabjc.2014.07.009
       
  • Curing and thermal degradation of diglycidyl ether of bisphenol A epoxy
           resin crosslinked with natural hydroxy acids as environmentally friendly
           hardeners

    • Authors: N. Tudorachi; F. Mustata
      Abstract: Publication date: Available online 21 July 2017
      Source:Arabian Journal of Chemistry
      Author(s): N. Tudorachi, F. Mustata
      The paper presents the curing of diglycidyl ether of bisphenol A (DGEBA) with two natural hydroxy acids and the thermal behavior of the cured products. The kinetics of the curing reactions were evaluated from the differential scanning calorimetry (DSC) curves using Ozawa, Kissinger methods and “Thermokinetics-3” software (Netzsch). Thermal decomposition behavior of the cured products up to 600 °C (in nitrogen) was made using simultaneous TG/FT-IR/MS technique. The kinetic parameters were obtained using the same software which shows that the thermal degradation takes place in three or four consecutive steps. The chemical composition of gases evolved at the thermal decomposition has been identified using FT-IR and MS techniques. The main products are: water, carbon dioxide, acids, anhydrides, aliphatic and aromatic hydrocarbons.

      PubDate: 2017-07-21T11:32:36Z
      DOI: 10.1016/j.arabjc.2017.07.008
       
  • Physical properties, biological applications and biocompatibility studies
           on biosynthesized single phase cobalt oxide (Co3O4) nanoparticles via
           Sageretia thea (Osbeck.)

    • Authors: Ali Talha Khalil; Muhammad Ovais; Ikram Ullah; Muhammad Ali; Zabta Khan Shinwari; Malik Maaza
      Abstract: Publication date: Available online 19 July 2017
      Source:Arabian Journal of Chemistry
      Author(s): Ali Talha Khalil, Muhammad Ovais, Ikram Ullah, Muhammad Ali, Zabta Khan Shinwari, Malik Maaza
      Cobalt oxide nanoparticles were successfully biosynthesized by complete green process using aqueous leaf extracts of Sageretia thea as chelating agent. Diverse techniques were applied for characterization. Antibacterial (with and without UV illumination), antileishmanial, antioxidant and enzyme inhibition applications were assessed, while freshly isolated macrophages and red blood cells were used for biocompatibility studies. Good antibacterial nature and enhancement of bactericidal nature upon UV modulation is reported. Staphylococcus aureus and Escherichia coli are indicated as most susceptible bacterial strains. Significant cytotoxic potential is revealed with IC50 calculated as 12.82 µg/ml and 3.16 µg/ml against the axenic leishmanial promastigote and amastigote cultures respectively. Biogenic cobalt oxide nanoparticles indicated DPPH free radical scavenging potential, while moderate antioxidant capacity and reducing power was demonstrated. Bioinspired cobalt oxide also demonstrated alpha amylase and protein kinase inhibition at higher concentrations. Biogenic cobalt oxide was found as more cytotoxic to macrophages (IC50=58.55 µg/ml) then to RBC’s (IC50> µg/ml). Our results indicate green synthesis as an alternative, effective and eco-friendly method for the biosynthesis of cobalt oxide nanoparticles with numerous biological applications.
      Graphical abstract image

      PubDate: 2017-07-21T11:32:36Z
      DOI: 10.1016/j.arabjc.2017.07.004
       
  • Quinoline derivatives as possible lead compounds for anti-malarial drugs:
           spectroscopic, DFT and MD study

    • Authors: B. Sureshkumar; Y. Sheena Mary; C. Yohannan Panicker; S. Suma; Stevan Armaković; Sanja J. Armaković; C. Van Alsenoy; B. Narayana
      Abstract: Publication date: Available online 18 July 2017
      Source:Arabian Journal of Chemistry
      Author(s): B. Sureshkumar, Y. Sheena Mary, C. Yohannan Panicker, S. Suma, Stevan Armaković, Sanja J. Armaković, C. Van Alsenoy, B. Narayana
      In this work we report spectroscopic characterization and reactivity study by density functional theory (DFT) and molecular dynamics (MD) simulations of two quinoline derivatives. Collected computational results for the two new derivatives have been compared with the pristine quinoline in order to investigate the consequences of modifications by introduction of chlorine atoms and methyl and OH groups. Potential energy distribution (PED) analysis has been performed in order to assign principal vibrational numbers. DFT calculations have been used to obtain global and local quantum-molecular descriptors including frontier molecular orbitals, charge distribution by molecular electrostatic potential (MEP) surface, average local ionization energy (ALIE) surface, and Fukui functions. Natural bond order (NBO) analysis has been performed in order to investigate hyper-conjugative properties. To investigate sensitivity towards autoxidation and hydrolysis we have calculated bond dissociation energies (BDE) and radial distribution functions (RDF). Molecular docking study has also been performed in order to initially assess the potential of target molecules to bind with dehydrogenase inhibitor and these quinoline derivatives can be a lead compounds for developing new anti-malarial drug.

      PubDate: 2017-07-21T11:32:36Z
      DOI: 10.1016/j.arabjc.2017.07.006
       
  • Degradation of PLA/ZnO and PHBV/ZnO composites prepared by melt processing

    • Authors: Alojz Anžlovar; Andrej Kržan; Ema Žagar
      Abstract: Publication date: Available online 12 July 2017
      Source:Arabian Journal of Chemistry
      Author(s): Alojz Anžlovar, Andrej Kržan, Ema Žagar
      Composites of polylactide (PLA) or poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) and ZnO nanoparticles (nZnO) were prepared by melt processing. During extrusion and moulding nano ZnO formed aggregates with sizes between 0.5 and 5 μm in PLA and between 0.5 and 15 μm in PHBV. Nano ZnO acted as a disruptor of PLA crystallization process and shifted the polymer glass transition temperature to lower temperatures. This was explained by degradation of PLA polymer chains during melt processing. SEC, FTIR and 1H NMR confirmed that PLA degradation was correlated to nZnO concentration. The effect of nZnO on crystallization of PHBV matrix was much less intense which was shown by TGA. On the other hand, PHBV showed significantly lower thermal stability than PLA. ZnO participated as a reactant and an accelerator in the degradation reaction of PLA and at a smaller extent with PHBV. The results of this study revealed that addition of pure nZnO in concentrations higher than 0.1 wt.% is not recommended for the preparation of PLA/nZnO composites by melt processing while in the case of PHBV the nZnO concentration may be higher but it should not exceed 1.0 wt.%. The exposure time of these materials to high temperatures during melt processing should also be minimized.

      PubDate: 2017-07-21T11:32:36Z
      DOI: 10.1016/j.arabjc.2017.07.001
       
  • Hierarchical zinc aluminate 3D nanostructures, synthesized by bio-inspired
           ultrasound assisted sonochemical route: Display and dosimetry applications
           

    • Authors: F. Femila Komahal; H. Nagabhushana; G.P. Darshan; B. Daruka Prasad
      Abstract: Publication date: Available online 11 July 2017
      Source:Arabian Journal of Chemistry
      Author(s): F. Femila Komahal, H. Nagabhushana, G.P. Darshan, B. Daruka Prasad
      ZnAl2O4:Tb3+ (0.25 - 5 mol %) nanophosphor were synthesized by ultrasound assisted sonochemical route using bio-sacrificial Aloe Vera (A.V.) gel as a template. The effect of sonication time, A.V. gel concentration, pH value, sonication power and temperature on the morphologies of the prepared samples were systematically explored and discussed. Probable formation mechanism for various morphologies of ZnAl2O4:Tb3+ nanophosphor was discussed. Structural and luminescence properties of the obtained samples were thoroughly investigated. Rietveld refinement of the prepared samples exhibit cubic structure with Fd 3 ¯ m space group. Thermoluminescence (TL) glow curves exhibit a well resolved glow peak at ∼ 197 C. TL intensity was found to increase linearly up to 1 kGy and thereafter it shows sub-linear behavior with increase of dose which indicates that the present phosphor was quite useful for TL dosimetry. Kinetic parameters related with the glow peaks were estimated by different methods. Photoluminescence (PL) spectra shows the characteristic Tb3+ ion peaks at ∼ 488 nm, 542 nm, 584 nm and 622 nm corresponding to 5D4→7FJ (J = 3, 4, 5 and 6) transitions respectively. The chromaticity co-ordinates of all the phosphors were well located in green region. Therefore, the present phosphor was quite useful as green component of white light- emitting diodes.

      PubDate: 2017-07-21T11:32:36Z
      DOI: 10.1016/j.arabjc.2017.07.002
       
  • Studies on the development of activated binary clay and corrosion
           monitoring using embedded sensor

    • Authors: Han-Seung Lee; Seung-Jun Kwon; Subbiah Karthick; Velu Saraswathy; Srinivasan Muralidharan
      Abstract: Publication date: Available online 11 July 2017
      Source:Arabian Journal of Chemistry
      Author(s): Han-Seung Lee, Seung-Jun Kwon, Subbiah Karthick, Velu Saraswathy, Srinivasan Muralidharan
      Bentonite and marconite are the low resistance moisture retaining conductive backfill materials used in earthing applications.Both the products contains some drawbacks: bentonite has limited moisture retaining capacity and marconite has 15-20% impurities which will corrode the earth connections resulting in the loss of the system which are found to be very expensive. Taking into consideration of the above drawbacks, the present study aimed at developing a cost effective and highly conductive backfill material for earthing application with improved performance. For this study, commercially available bentonite and metakaolin (binary) clay was activated through physical, chemical and thermal treatments and the corrosion performance of binary clay was evaluated by using mild steel (MS) and galvanized (GI) steel Among the three activation methods, chemical activation method was found beneficial for mild steel in binary clay media. The conductivity of the chemically activated clay was 204.7 mS/cm, pH was 12.58, and the particle size distribution was found to be 40 to 50 µm indicates the better corrosion resistance and quite suitable for earthing applications. Chemical activation of the clay mainly involves the breaking of bonds and dissolution of the three-dimensional network structure of glass which in turn cause Na+ ions move closer to the center point of crystal structure and the solubility of SiO2 in clay markedly increases. Potential-time studies showed that galvanizing loses its coating property within ten days in all the three type of clays used. Activation process significantly reduced the corrosion rate (3 and 6 times) in the case of thermally activated (TAC) and chemically activated clay (CAC) respectively. Earth excavation studies were conducted to monitor the corrosion of MS and GI using embedded MnO2 sensor. This investigation opens up a lot of scope for utilizing activated binary clay for all earthing applications.

      PubDate: 2017-07-21T11:32:36Z
      DOI: 10.1016/j.arabjc.2017.07.003
       
  • Corrosion behavior of CoCrMoW cast alloy in lactic acid environment for
           surgical applications

    • Authors: A. Banu; M. Marcu; C. Juganaru; P. Osiceanu; M. Anastasescu; L. Capra
      Abstract: Publication date: Available online 21 June 2017
      Source:Arabian Journal of Chemistry
      Author(s): A. Banu, M. Marcu, C. Juganaru, P. Osiceanu, M. Anastasescu, L. Capra
      The corrosion behavior of CoCrMoW alloy in lactic acid environment during 168 hours of immersion at 37°C have been studied and assessed by means of electrochemical techniques (open circuit potential, (OCP) potentiodynamic polarization curves and electrochemical impedance spectroscopy, (EIS)). Further, the oxide film thickness formed after immersion and the quantity of ions released have been evaluated by X-ray photoelectron spectroscopy (XPS) and inductively coupled plasma optical spectroscopy (ICP-OES). A good correlation between the results, related to the oxide film thickness, obtained from these experimental techniques was achieved. The research has also shown that the tendency of growing of oxide film becomes slower as the time of immersion is longer. The higher corrosion resistance of CoCrMoW alloy in lactic acid environment is due to the formation of the oxide film highly enriched in Cr(III) on the alloy surface. With a small corrosion rate, e.g. 45 nm year-1, this alloy is characterizes that “Perfect Stable” according to ISO 8044/2000. Overall, the present study provides additional evidences with respect to the benefic influence of tungsten on passivity, explained by a higher resistance to pitting corrosion of the CoCrMoW alloy in lactic acid with sodium chloride.

      PubDate: 2017-06-27T02:51:14Z
      DOI: 10.1016/j.arabjc.2017.06.003
       
  • Inside Front Cover - Editorial Board

    • Abstract: Publication date: July 2017
      Source:Arabian Journal of Chemistry, Volume 10, Issue 5


      PubDate: 2017-06-20T05:49:34Z
       
  • Synthesis, antimicrobial activity and docking study of some novel
           4-(4,4-dimethyl-2,6-dioxocyclohexylidene)methylamino derivatives carrying
           biologically active sulfonamide moiety

    • Authors: Mostafa M. Ghorab; Aiten M. Soliman; Mansour S. Alsaid; Ahmed A. Askar
      Abstract: Publication date: Available online 6 June 2017
      Source:Arabian Journal of Chemistry
      Author(s): Mostafa M. Ghorab, Aiten M. Soliman, Mansour S. Alsaid, Ahmed A. Askar
      A new series of 4-((4,4-dimethyl-2,6-dioxocyclohexylidene)methylamino)-N-(substituted)benzenesulfonamide 3–17, monosubstituted 2-((4-((4-aminophenyl)sulfonyl)phenyl)amino)methylene 18, and its disubstituted derivative 19 were synthesized from the starting material 2-((dimethylamino)methylene)-5,5-dimethylcyclohexane-1,3-dione 2. The crystal structures of compounds 2, 7 and 13 were reported by us through X-ray crystallography. All the prepared compounds were evaluated for their antibacterial activity against Gram-positive bacteria (Staphylococcus aureus, Bacillus subtilis, Clostridium sporogenes), Gram-negative bacteria (Pseudomonas aeruginosa, Escherichia coli), and antifungal activity against Aspergillus fumigatus, Penicillium chrysogenum, Fusarium oxysporum, Candida albicans. The synthesized compounds displayed interesting antimicrobial activity. Compounds 4 and 12 were the most potent in this study and displayed higher activity compared to the reference drugs, with MIC value of 3.9–31.3μg/mL against a panel of Gram-positive, Gram-negative bacteria and fungi. Molecular modeling was performed inside the active site of dihydropteroate synthase. The synthesized compounds showed similar orientation and binding interactions to that of the co-crystallized ligand inside the binding pocket.
      Graphical abstract image

      PubDate: 2017-06-20T05:49:34Z
      DOI: 10.1016/j.arabjc.2017.05.022
       
  • Toward use of a nano layered double hydroxide/ammonium pyrrolidine
           dithiocarbamate in speciation analysis: one-step dispersive solid-phase
           extraction of chromium species in human biological samples

    • Authors: Behruz Barfi; Alireza Asghari; Maryam Rajabi
      Abstract: Publication date: Available online 10 June 2017
      Source:Arabian Journal of Chemistry
      Author(s): Behruz Barfi, Alireza Asghari, Maryam Rajabi
      Chromium is a controversial element with an important essentiality and toxicity. Depending on its different species, its speciation analysis in bio-origin matrices is of utmost importance. Ammonium pyrrolidine dithiocarbamate (APDC) and layered double hydroxide (LDH) nanoparticles, with the purpose of combining their outstanding performances, were served to speciate chromium ions in human biological samples. The as-obtained sorbent (nano LDH-APDC) - after characterization by X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy, thermal gravimetric analysis (TGA), and scanning electron microscopy (SEM) - was used as a novel pH-sensitive adsorbent in an integrated one-step dispersive solid-phase extraction (I-OS-DSPE), which combines the benefits of the air-assisted microextraction and dispersive solid-phase extraction methods. An interesting feature of the nano LDH-APDC sorbent is that it is dissolved in an aqueous solution when the pH of the solution is lower than 4. Thus the analyte elution step, as required in most of the sorbent-based extraction methods, was obviated by dissolving the sorbent in an acidic solution after extraction and separation from the sample solution. The Cr(VI) ions were first extracted, while the Cr(III) ions remained in the aqueous solution. The extract was then directly injected into a flame atomic absorption spectrometer with a micro-sampling introduction system, and the concentration of the Cr(III) ions was calculated by its subtraction from the total chromium ions present. Several variables including the pH (5), type and amount of the nanosorbent used (30 mg of nano (Zn-Al) LDH-APDC), number of extraction cycles (15 times), and elution conditions (200 µL of 6.0 mol L-1 HNO3) were investigated to achieve the maximum extraction efficiency. Under the optimum experimental conditions, the limit of detection, linear range, consumptive index, and enrichment factor for the Cr(VI) ions were 2.4 μg L−1, 8.0-640 μg L−1, 0.24, and 42.5 ± 1, respectively. These findings suggested that nano (Zn-Al) LDH-APDC could be regarded as a promising adsorbent for an efficient speciation of the chromium species in the human hair, nail, saliva, plasma, and urine samples.

      PubDate: 2017-06-15T05:25:29Z
      DOI: 10.1016/j.arabjc.2017.06.002
       
  • Review of Corrosive Environments for Copper and its Corrosion Inhibitors

    • Authors: A. Fateh; M. Aliofkhazraei; A.R. Rezvanian
      Abstract: Publication date: Available online 8 June 2017
      Source:Arabian Journal of Chemistry
      Author(s): A. Fateh, M. Aliofkhazraei, A.R. Rezvanian
      This review paper deals with corrosion of copper and its alloys in corrosive environments and their corrosion inhibitors. The main corrosion inhibitor groups for copper are introduced and a review of adsorption models is provided. The main part of this work is to investigate different corrosive environments for copper and its alloys and their corrosion inhibitors used in such environments to protect copper. According to literature, the corrosion inhibition behavior of organic corrosion inhibitors and their derivatives in comparison to inorganic ones are further evaluated. Knowing maximum corrosion inhibition efficiency of a specific corrosion inhibitor in a specific corrosive environment is helpful to choose the most appropriate corrosion inhibitor compound.

      PubDate: 2017-06-10T04:15:09Z
      DOI: 10.1016/j.arabjc.2017.05.021
       
  • Polymer-Silica Nanocomposite Membranes for CO2 capturing

    • Authors: Nezar H. Khdary; Mamdouh E. Abdelsalam
      Abstract: Publication date: Available online 8 June 2017
      Source:Arabian Journal of Chemistry
      Author(s): Nezar H. Khdary, Mamdouh E. Abdelsalam
      Reducing carbon dioxide (CO2) is an area of great interest in current international efforts geared towards lowering emissions and combating global warming. In this work, amino-silica composite membranes were prepared and used to capture carbon dioxide. The surface of silica particles was chemically modified with amine to efficiently capture carbon dioxide. The phase separation technique was used to prepare the membranes from a composite containing polyvinylidene-fluoride-hexafluoropropylene (PVDF-HFP), amino-silica particles, acetone and water. SEM images revealed that the membranes composed of multi layers of porous polymer uniformly impregnated with silica particles. Both XRD and FTIR results have validated the perfect integration of silica particles within the polymeric network. The mechanical properties of the membrane is improved by the presence of silica particles as proved by the high tensile strength value (1.5 N/cm2) obtained for the PVDF-HFP/SiO2 membrane compared to (0.9 N/cm2) obtained for bare PVDF-HFP membrane. Also, we succeeded in recording SEM images to show that the plastic deformation of the film associated with the formation of macro-holes. To the best of our knowledge this is the first time for such results to be monitored with SEM to observe the macroscopic evolution of the structure. Additionally, the surface area was significantly increased from (3.8 m2/g) for bare PVDF-HFP membrane to (116.4 m2/g) for PVDF-HFP impregnated with silica particles. Moreover, the CO2 separation efficiency depends on both surface area and the quantity of amino-SiO2 added to the membrane. The addition of amino-silica particles leads to a significant uptake of carbon dioxide compared to non-modified polymer membrane. The results obtained indicated that combing the phase separation with amino silica particles provided a cost effective route to scaling up the synthesis of membranes that were mechanically stable and highly efficient at CO2 capture.
      Graphical abstract image

      PubDate: 2017-06-10T04:15:09Z
      DOI: 10.1016/j.arabjc.2017.06.001
       
  • Regio- and Stereoselective Route to
           Bis-[3-methyl-1,1‘,4‘-triaryl-5-oxo-spiro-pyrazoline-4,5‘-pyrazoline]
           Derivatives via 1,3-Dipolar Cycloaddition under Sonication

    • Authors: Haider Behbehani; Kamal M. Dawood; Hamada Mohamed Ibrahim; Noha S. Mostafa
      Abstract: Publication date: Available online 26 May 2017
      Source:Arabian Journal of Chemistry
      Author(s): Haider Behbehani, Kamal M. Dawood, Hamada Mohamed Ibrahim, Noha S. Mostafa
      Bis-[3-methyl-1,1‘,4‘-triaryl-5-oxo-spiro-pyrazoline-4,5‘-pyrazoline] derivatives are synthesized regio- and stereoselectively via 1,3-dipolar cycloaddition of the bis-hydrazonoyl chlorides with 4-arylidenepyrazol-5-one derivatives. The cycloaddition route is optimized under both ultrasonic irradiation and conventional heating modes. The regio- and stereoselectivity of the cycloadducts are confirmed by spectral and X-ray crystallographic analysis.
      Graphical abstract image

      PubDate: 2017-05-30T23:34:20Z
      DOI: 10.1016/j.arabjc.2017.05.016
       
  • Luminescence properties of yttrium gadolinium orthovanadatew nanophosphors
           and efficient energy transfer from VO43- to Sm3+ via Gd3+ ions

    • Authors: Vishnu V. Jaiswal; Swati Bishnoi; G. Swati; Paramjeet Singh; Naina Lohia; Sivaiah Bathula; D. Haranath
      Abstract: Publication date: Available online 26 May 2017
      Source:Arabian Journal of Chemistry
      Author(s): Vishnu V. Jaiswal, Swati Bishnoi, G. Swati, Paramjeet Singh, Naina Lohia, Sivaiah Bathula, D. Haranath
      In this paper, luminescence properties of orthovanadates, Y1-x-yGdxVO4:ySm3+ (where x = 0.05-0.50, y = 0.01-0.05), and the energy transfer mechanism from VO4 3- to Sm3+ via Gd3+ ions were investigated in detail. X-ray diffraction (XRD) analysis confirmed the crystalline phase for synthesized nanophosphor in a tetragonal structure with l41/amd space group. The average crystallite size estimated from XRD was ∼28 nm. Field-emission scanning electron microscopy coupled with energy dispersive X-ray analysis revealed oval shaped morphology and composition of the nanophosphor, respectively. From high-resolution transmission electron microscopy observations, the particle sizes were found to be in the range 10-80 nm. The photoluminescence studies of Y0.77Gd0.20VO4:0.03Sm3+ nanophosphor under 311 nm excitation exhibits dominant emission peak at 598 nm corresponding to 4G5/2→6H7/2 transition. The energy transfer occurs from VO4 3- to Sm3+ via Gd3+ ions was confirmed by applying Dexter and Reisfeld’s theory and Inokuti-Hirayama model. Moreover, the energy transfer efficiencies and probabilities were calculated from the decay curves. Furthermore, Commission International de l’Eclairage (CIE) color coordinate (0.59, 0.37) has been observed to be in the orange-red (598 nm) region for Y0.77Gd0.20VO4:0.03Sm3+nanophosphor. These results perfectly established the suitability of these nanophosphors in improving the efficiency of silicon solar cells, light emitting diodes, semiconductor photophysics, and nanodevices.

      PubDate: 2017-05-30T23:34:20Z
      DOI: 10.1016/j.arabjc.2017.05.020
       
  • Alkyl-malonate-substituted thiacalix[4]arenes as ligands for bottom-up
           design of paramagnetic Gd(III)-containing colloids with low cytotoxicity

    • Authors: Alexey Stepanov; Irek Nizameev; Rustem Amirov; Sofia Kleshnina; Gulshat Khakimullina; Svetlana Solovieva; Alexandra Voloshina; Anastasya Strobykina; Aidar Gubaidullin; Ramil Nugmanov; Asiya Mustafina
      Abstract: Publication date: Available online 26 May 2017
      Source:Arabian Journal of Chemistry
      Author(s): Alexey Stepanov, Irek Nizameev, Rustem Amirov, Sofia Kleshnina, Gulshat Khakimullina, Svetlana Solovieva, Alexandra Voloshina, Anastasya Strobykina, Aidar Gubaidullin, Ramil Nugmanov, Asiya Mustafina
      The present work introduces thiacalix[4]arene adopting 1,3-alternate conformation with alkyl-malonate terminal substituents as ligands for Gd(III) ions. pH-dependent complex formation of Gd(III) ions via alkyl-malonate substituents in aqueous DMSO solutions results in a precipitation. The precipitated complexes were converted into hydrophilic colloids of “plum-pudding” morphology, where the Gd(III) complexes form hard small (1.5-4 nm) cores included into larger (about 180 nm) soft PSS shells. The precipitate-to-colloid transformation is facilitated by polystyrolsulfonate (PSS) for Gd(III) complexes with thiacalix[4]arene bearing propyl-malonate groups, while the presence of PSS triggers a dissolution of the precipitated complexes for thiacalix[4]arenes with pentyl-malonate substituents. To a lesser extent the similar tendency disturbs the formation of PSS-stabilized colloids on the basis of butyl-malonate substituted thiacalix[4]arene. The PSS-stabilized colloids exhibit high longitudinal and transverse relaxivities (r1=23.8 and r2=29.4 mM-1s-1 at 0.47 T, respectively), while the recoating of the PSS-stabilized colloids with polyethyleneimine is accompanied by the dissolution of the hard cores. High relaxivity along with low cytotoxicity of PSS-stabilized colloids indicates their applicability as contrast agents in MRI.

      PubDate: 2017-05-30T23:34:20Z
      DOI: 10.1016/j.arabjc.2017.05.017
       
  • Effect of synthesis pH on the physicochemical properties of a synthesized
           Bi2WO6 and the type of substrate chosen, in assessing its photo-catalytic
           activities

    • Authors: C. Jaramillo-Páez; J.A. Navío; M.C. Hidalgo
      Abstract: Publication date: Available online 26 May 2017
      Source:Arabian Journal of Chemistry
      Author(s): C. Jaramillo-Páez, J.A. Navío, M.C. Hidalgo
      Crystalline orthorhombic Bi2WO6 powders were synthesized by a hydrothermal method from aqueous solutions of Bi(NO3)3·5H2O and Na2WO4·2H2O over a range of three selected pH values (2.0, 5.0 and 7.0), using NaOH as precipitating agent. The as-prepared catalysts were characterized by XRD, BET, FE-SEM, TEM, XPS and UV-Vis spectroscopy. The effect of pH-synthesis on crystallinity, morphologies, surface area and optical absorption properties, were investigated. Although the pH has a marked influence on morphology, the nature of the precipitating agent (NaOH or TEA) also influences the morphology and surface structure composition, as it is observed in the present work. Three different probe molecules were used to evaluate the photo-catalytic properties under two illumination conditions (UV and Visible): Methyl Orange and Rhodamine B were chosen as dye substrates and Phenol as a transparent substrate. The photo-catalytic activities are strongly dependent not only on the pH used in the synthesis but also on the nature of the chosen substrate in assessing the photo-catalytic activities. Results were compared with those obtained when using TiO2(P25, Evonik) in the same experimental conditions. The photo-catalytic activity of one of the synthesised samples has been evaluated by exposing a mixture of Rhodamine B and Phenol in water, to different illumination conditions. Our results provide new evidences about the issue of whether dyes are suitable substrates to assess the activity of a photo-catalyst.

      PubDate: 2017-05-30T23:34:20Z
      DOI: 10.1016/j.arabjc.2017.05.014
       
  • Synthesis of ferrocene boronic acid-based block copolymers via RAFT
           polymerization and their micellization, redox responsive and glucose
           sensing properties

    • Authors: Muhammad Saleem; Li Wang; Haojie Yu; Zain-ul- Abdin
      Abstract: Publication date: Available online 26 May 2017
      Source:Arabian Journal of Chemistry
      Author(s): Muhammad Saleem, Li Wang, Haojie Yu, Zain-ul- Abdin
      Current study is focused on the synthesis of three novel diblock copolymers poly(2-(methacrylolyoxy)ethyl ferrocene carboxylate-b-polymethyl vinyl amido phenyl boronic acid, poly(2-(methacrylolyoxy) ethyl ferrocene carboxylate-b-poly vinylamido phenyl boronic acid and poly(2-(methacrylolyoxy)ethyl ferrocene carboxylate-b-polystyrene boronic acid by using S-methoxycarbonylphenylmethyl dithiobenzoate as reversible addition–fragmentation chain transfer polymerization agent. The synthesized block copolymers were characterized by gel permeation chromatography, fourier transform infrared spectroscopy, 1H nuclear magnetic resonance spectroscopy, dynamic light scattering, scanning electron microscopy and transmission electron microscopy. Detailed micellization behaviour of poly (2-(methacrylolyoxy)ethyl ferrocene carboxylate-b-polymethyl vinyl amido phenyl boronic acid (in binary organic solvents mixture and aqueous solution) was studied. Comparative studies of micellization showed that the larger aggregates were obtained in binary organic solvents system than during dialysis in aqueous medium. The redox responsive behaviour of poly (2-(methacrylolyoxy)ethyl ferrocene carboxylate-b-polymethyl vinyl amido phenyl boronic acid was investigated by water soluble oxidizing (Ammonium cerium nitrate) and reducing (Sodium hydrogen sulphite) agents. Glucose binding/sensing properties of poly (2-(methacrylolyoxy)ethyl ferrocene carboxylate-b-polymethyl vinyl amido phenyl boronic acid were also explored by micellization. It was found that the increase in polarity and swelling of poly(2-(methacrylolyoxy)ethyl ferrocene carboxylate-b-polymethyl vinyl amidophenyl boronic acid micelles was due to the redox behaviour of ferrocene, while binding of glucose with boronic acids hydroxyls appear as unimers or small aggregates.
      Graphical abstract image

      PubDate: 2017-05-30T23:34:20Z
      DOI: 10.1016/j.arabjc.2017.05.018
       
  • Organic analytes sensitivity in meso-porous silicon electrical sensor with
           front side and backside contacts

    • Authors: F.A. Harraz; A.A. Ismail; M. Faisal; S.A. Al-Sayari; A. Al-Hajry; M.S. Al-Assiri
      Abstract: Publication date: Available online 26 May 2017
      Source:Arabian Journal of Chemistry
      Author(s): F.A. Harraz, A.A. Ismail, M. Faisal, S.A. Al-Sayari, A. Al-Hajry, M.S. Al-Assiri
      Chemical sensors fabricated from porous silicon (PSi) for liquid organic analytes (ethanol, acetonitrile, methanol, acetone) are demonstrated, with an emphasis on the impact of the Ag electrical contact placement on sensor performance. Sensors with front side contact display larger shift in capacitance response (2-3 times more sensitive) compared to the backside sensor design as the solvents immediately interact with the pore openings before infiltration. Much slower response time (7 to 30 minutes range) for front side vs. (50 to 200 seconds scale range) for backside configuration is observed. Both sensor designs exhibit excellent solvent infiltration-evaporation reversible response, indicating no chemical reaction or surface modification occurred. The response time was in the order of ethanol > acetonitrile > methanol > acetone, which correlates well with the solvent vapor pressure. The capacitance shift in both sensor devices is likely related to the interface interaction, revealing a closer correlation with the dipole moments of solvents. This is supported by the photoluminescence quenching upon exposure to organic solvents, with a relative intensity decrease tracks with the dipole moment. The sensitivity remains sufficiently high during the repeated use, with excellent storage stability for backside contact. This comparative study suggests the viability of the current sensor structure and design particularly with backside contact for sensing of various chemical analytes with notably sensitivity and extremely rapid response.

      PubDate: 2017-05-30T23:34:20Z
      DOI: 10.1016/j.arabjc.2017.05.015
       
  • Interaction of Cholesterol with Artificial Bilayer Lipid Membrane System
           and Development of an Electrochemical Sensor

    • Authors: M. Alagappan; A. Kandaswamy; M. Kumaravel; S. Rameshkumar
      Abstract: Publication date: Available online 26 May 2017
      Source:Arabian Journal of Chemistry
      Author(s): M. Alagappan, A. Kandaswamy, M. Kumaravel, S. Rameshkumar
      Interaction of Cholesterol with the bilayer arrangement of phospholipid molecules was studied using electrochemical impedance spectroscopy in Sodium Chloride (NaCl) bath solutions. The membrane resistance (Rm) was decreased from 3.35 GΩ in 1.0M NaCl bath to 0.756 GΩ in 0.01M NaCl bath. The cholesterol molecules were found to penetrate into Bilayer Lipid Membrane (BLM) and fluidized the BLM phase. Due to fluidization, the membrane resistance was decreased. The fluidization effect of cholesterol was dependent on the concentration of bath solutions. In 1.0M NaCl bath solution, the membrane was stable up to 200µM concentration of cholesterol. With the addition of cholesterol in NaCl bath solutions, the membrane capacitance was increased. An impedimetric sensor was developed based on the membrane resistance in the presence of cholesterol at various concentrations. The detection limit of cholesterol by impedimetric sensor was dependent on the concentration of NaCl in the bath.

      PubDate: 2017-05-30T23:34:20Z
      DOI: 10.1016/j.arabjc.2017.05.013
       
  • Ditopic Ditiocarbamate Ligands for the Production of Trinuclear Species

    • Authors: Edgar Marín-Carrillo; Adrián Ruiz-Martinez; Hugo Valdés; Reyna Reyes-Martinez; Simon Hernandez-Ortega; Bethsy Adriana Aguilar-Castillo; David Morales-Morales
      Abstract: Publication date: Available online 26 May 2017
      Source:Arabian Journal of Chemistry
      Author(s): Edgar Marín-Carrillo, Adrián Ruiz-Martinez, Hugo Valdés, Reyna Reyes-Martinez, Simon Hernandez-Ortega, Bethsy Adriana Aguilar-Castillo, David Morales-Morales
      Reactions of group 10 transition metals with the ditopic ligand dipicolyldithiocarbamate (DPDTC) were performed. Thus, 1:2 reactions of [Ni(CH3COO)2], [Pd(COD)Cl2] or [Pt(COD)Cl2] with DPDTC produced monomeric complexes of the type [M(κ2 -SCS-DPDTC)2, M= Ni (1), Pd (2) or Pt (3)] with the dithiocarbamate ligand (DTC) coordinated in a typical chelate κ2 -SCS fashion. Interestingly, the reaction of [NiCl2] with DPDTC, under similar conditions, afforded the organic compound 2-(pyridin-2-ylmethyl)imidazo[1,5-a]pyri-dine-3(2H)-thione (4) as unique product. In order to prove the ditopic nature of the ligand DPDTC, complex [Pd(κ2 -SCS-DPDTC)2] (2) was further reacted with [ZnCl2] in a 1:2 molar ratio, to yield the trinuclear complex [Cl2Zn(κ 2-NN-DPDTC-SCS-κ2 )Pd(κ2 -SCS-DPDTC-NN-κ 2)ZnCl2] (5). The molecular structures of all compounds were determinate by typical analytical techniques including the unequivocal determination of all structures by single crystal X-ray diffraction analysis. As expected, complexes 1-3 are isostructural, the metal centres exhibiting slightly distorted square-planar geometries. While in 5, the trinuclear nature of the complex in confirmed exiting a nice combination of tetrahedral-square planar-tetrahedral geometries for the Zn-Pd-Zn centers respectively.
      Graphical abstract image

      PubDate: 2017-05-30T23:34:20Z
      DOI: 10.1016/j.arabjc.2017.05.019
       
  • HPLC-ICP-MS speciation of selenium in Se-cultivated Flammulina velutipes

    • Authors: Mei Tie; Baorui Li; Tiebiao Sun; Wei Guan; Yanqiu Liang; Huawei Li
      Abstract: Publication date: Available online 22 May 2017
      Source:Arabian Journal of Chemistry
      Author(s): Mei Tie, Baorui Li, Tiebiao Sun, Wei Guan, Yanqiu Liang, Huawei Li
      Selenium is an essential micronutrient required at trace levels for human health, and dietary intake is the only source of selenium, which appears mainly in the form of selenocompounds. In this study, Flammulina velutipes was grown for 80 days in standard medium containing selenite, and the level of total selenium in the organism was then determined by inductively-coupled plasma mass spectrometry (ICP-MS). In Se-cultivated F. velutipes, selenium was mainly distributed in the water-soluble form and the content of soluble selenium-containing species in Se-cultivated F. velutipes was 47.10 mg kg-1, accounted for 72.5% of the total selenium content. The water-soluble proteins in F. velutipes were extracted and precipitated by different ammonium sulfate saturation concentrations. Size-exclusion high performance liquid chromatography (SEC-HPLC) analysis of these proteins revealed the presence of at least six selenium-containing protein species, with molecular weights ranging from 9,000-74,000 Da, Selenium-containing proteins represented about 7.0% of the total soluble selenium. The result of this study suggested that Se-cultivated F. velutipes could potentially be considered as a selenium supplement for human.

      PubDate: 2017-05-26T08:57:17Z
      DOI: 10.1016/j.arabjc.2017.05.012
       
  • Optimization and modeling of synthesis parameters of neodymium(III)
           bromide by dry method using full factorial design analysis

    • Authors: Yassine Bounouri; Madjid Berkani; Abdelmalek Zamouche; Leszek Rycerz
      Abstract: Publication date: Available online 18 May 2017
      Source:Arabian Journal of Chemistry
      Author(s): Yassine Bounouri, Madjid Berkani, Abdelmalek Zamouche, Leszek Rycerz
      The synthesis of neodymium(III) bromide (NdBr3) by sintering brominating of neodymium oxide (Nd2O3) with ammonium bromide (NH4Br) was investigated. The influence of various synthesis parameters (temperature, contact time and stoichiometry) on the reaction yield was studied and optimized. The main interaction effects of the synthesis parameters on the reaction yield were also determined by a full 23 factorial designs with six replicates at the center point. This study showed that the optimum conditions for the synthesis of NdBr3 are following:: contact time t = 60 min, stoichiometry in moles (Nd2O3:NH4Br = 1: 24) and temperature T = 400 °C. The reaction yield for these parameters was equal 97.80%. The first order model was obtained to predict the reaction yield as a function of these three parameters. It was shown that all parameters have a significant positive influence on reaction yield. In addition it was pointed out also that the interaction effects between them are significant.

      PubDate: 2017-05-20T15:17:19Z
      DOI: 10.1016/j.arabjc.2017.05.003
       
  • Towards oxidative denitrogenation of fuel oils: Vanadium oxide-catalysed
           oxidation of quinoline and adsorptive removal of quinoline-N-oxide using
           2,6-pyridine-polybenzimidazole nanofibers

    • Authors: A.S. Ogunlaja; M.S. Abdul-quadir; P.E. Kleyi; E.E. Ferg; P. Watts; Z.R. Tshentu
      Abstract: Publication date: Available online 18 May 2017
      Source:Arabian Journal of Chemistry
      Author(s): A.S. Ogunlaja, M.S. Abdul-quadir, P.E. Kleyi, E.E. Ferg, P. Watts, Z.R. Tshentu
      The study provides a technological method for the removal of nitrogen compounds from fuels, via oxidation and extractive adsorption. The use of batch process resulted in lack of specificity of the quinoline oxidation reaction with several products produced via ring-opening while the flow micro-reactor, presented, a high degree of selectivity to quinoline-N-oxide (67%). The application of molecularly imprinted 2,6-pyridine-polybenzimidazole nanofibers displayed excellent quinoline-N-oxide removal (86%) with an adsorption capacity (qe) of 4.8 mg/g. Isothermal titration calorimetry (ITC) interactions between quinoline-N-oxide and 2,6-PyPBI confirmed a favourable interaction. DFT studies on quinoline-N-oxide vs 2,6-PyPBI further indicated: (i) a hydrogen bonding (through amino group of 2,6-PyPBI and oxygen atoms of the quinoline-N-oxide), (ii) pi-pi stacking and (iii) van der Waals interactions. The selective oxidation and adsorption of nitrogen compounds present in fuel, which has been demonstrated here, would be a sustainable green chemistry technology for the production of clean fuel.

      PubDate: 2017-05-20T15:17:19Z
      DOI: 10.1016/j.arabjc.2017.05.010
       
  • Nanoparticles: Properties, Applications and Toxicities

    • Authors: Ibrahim Khan; Khalid Saeed; Idrees Khan
      Abstract: Publication date: Available online 18 May 2017
      Source:Arabian Journal of Chemistry
      Author(s): Ibrahim Khan, Khalid Saeed, Idrees Khan
      This Review is provided a detailed overview of the synthesis, properties and applications of nanoparticles (NPs) exist in different forms. NPs are tiny materials having size ranges from 1 to 100 nm. They can be classified into different classes based on their properties, shapes or sizes. The different groups include fullerenes, metal NPs, ceramic NPs, and polymeric NPs etc. NPs possess unique physical and chemical properties due to their high surface area and nanoscale size. Their optical properties are reported to be dependent on the size, which imparts different colors due to absorption in the visible region. Their reactivity, toughness and other properties are also dependent on their unique size, shape and structure. Due to these characteristics, they are suitable candidates for various commercial and domestic applications, which include catalysis, imaging, medical applications, energy-based research, environmental applications etc. Heavy metal NPs of lead, mercury and tin are reported to be so rigid and stable that their degradation is not easily achievable, which can lead to many environmental toxicities.
      Graphical abstract image

      PubDate: 2017-05-20T15:17:19Z
      DOI: 10.1016/j.arabjc.2017.05.011
       
  • Synthesis and Characterization of Thin Film Composite Membranes Made of
           PSF-TiO2/GO Nanocomposite Substrate for Forward Osmosis Applications

    • Authors: T. Sirinupong; W. Youravong; D. Tirawat; W.J. Lau; G.S. Lai; A.F. Ismail
      Abstract: Publication date: Available online 18 May 2017
      Source:Arabian Journal of Chemistry
      Author(s): T. Sirinupong, W. Youravong, D. Tirawat, W.J. Lau, G.S. Lai, A.F. Ismail
      Support layer of thin film composite (TFC) membrane plays an important role in forward osmosis (FO) performance. A new type of support layer or nanocomposite substrate was developed by incorporating titanium dioxide (TiO2)/graphene oxide (GO) into polysulfone (PSF) matrix. Prior to performance evaluation, the developed substrates were characterized with respect to surface chemistry, roughness and cross-sectional morphology. The results showed that both surface hydrophilicity and roughness of PSF-based substrates were increased upon incorporation of nanomaterials. Substrates with long finger-like voids extended from the top to the bottom could be developed upon incorporation of TiO2 (SubstrateTiO2) or TiO2/GO mixture (SubstrateTiO2/GO). The improved surface hydrophilicity and favorable structure formed are the main factors leading to higher water flux of nanocomposite substrate. Moreover, the water flux of FO using TFC membranes could be enhanced using this nanocomposite substrate. Comparing to the control TFC membrane, the TFC membranes made of SubstrateTiO2 and SubstrateTiO2/GO exhibited greater water flux with minimum increase in reverse draw solute flux. Based on the results obtained, it can be concluded that the incorporation of TiO2 and/or GO nanoparticles into PSF substrate could potentially improve the TFC membrane performance during FO applications.

      PubDate: 2017-05-20T15:17:19Z
      DOI: 10.1016/j.arabjc.2017.05.006
       
  • Electrochemical oxidation of vanillic acid by electro-Fenton process:
           toward a novel route of protocatechuic acid electrosynthesis

    • Authors: Raouia REKIK; Morched HAMZA; Mohamed JAZIRI; Ridha ABDELHEDI
      Abstract: Publication date: Available online 17 May 2017
      Source:Arabian Journal of Chemistry
      Author(s): Raouia REKIK, Morched HAMZA, Mohamed JAZIRI, Ridha ABDELHEDI
      The electrochemical oxidation of vanillic acid (VA) in acetone-water mixtures, was studied by electro-Fenton (EF) process in an undivided electro-chemical cell equipped with a carbon fiber cloth as cathode and Pt anode. The objective is the conversion of VA into protocatechuic acid (PCA) well known by its high added value. To our knowledge, the EF method was not used in organic electrosynthesis. The influence of several operating parameters, such as applied current, initial VA concentration and volumic percentage of acetone was investigated. The evolution of the concentrations of VA and its main oxidation product PCA during electrolyses was monitored by means of high performance liquid chromatography (HPLC). The experimental data indicated that the kinetics of VA disappearance follow a pseudo first and zero orders for initial VA concentrations respectively equals to 6.5 and (10, 20, 30) mmol L-1. The maximum PCA concentration, increases with volumic percentage of acetone and initial VA concentration. Under optimal experimental conditions of applied current (20 mA) and volumetric percentage of acetone (20%), the increase of the initial VA concentration leads to a linear increase of the maximum of PCA concentration. The very good selectivity rate of the oxidation of VA to PCA by the EF process, was interpreted by the stabilizing effects of acetone and especially the complexation of PCA by the iron ions.

      PubDate: 2017-05-20T15:17:19Z
      DOI: 10.1016/j.arabjc.2017.05.001
       
  • Synthesis and antioxidant study of new polyphenolic hybrid-coumarins

    • Authors: Karina Pérez-Cruz; Mauricio Moncada-Basualto; Javier Morales-Valenzuela; Germán Barriga; Patricio Navarrete-Encina; Luis Núñez-Vergara; J.A. Squella; Claudio Olea-Azar
      Abstract: Publication date: Available online 17 May 2017
      Source:Arabian Journal of Chemistry
      Author(s): Karina Pérez-Cruz, Mauricio Moncada-Basualto, Javier Morales-Valenzuela, Germán Barriga, Patricio Navarrete-Encina, Luis Núñez-Vergara, J.A. Squella, Claudio Olea-Azar
      The antioxidant capacity of hydroxylated coumarins and hydroxybenzoic acids has been widely described. However, there is little information on the antioxidant activity when both systems are functionalized. In this work, new hybrid compounds synthesis with a common coumarin scaffold and hydroxybenzoic acids is described. Their antioxidant capacity was evaluated against reactive oxygen species (ROS) using oxygen radical absorbance capacity-fluorescein (ORAC-FL), electron spin resonance (ESR) spin trapping, quenching of superoxide anion, cellular antioxidant activity (CAA) and a ferric reducing ability of plasma (FRAP assay). Additionally, the local reactivity indicator (Fukui index) was calculated to discriminate different reactive sites in the new molecules in which the oxidative process occurs. Likewise, the BDE values were calculated in order to obtain information about the antioxidant capacity for HAT mechanisms. The insertion of organic phenols in a simple coumarin structure produced new derivatives with an improved antioxidant capacity in relation to coumarin 1a. For compound 3c, a synergy phenomenon in ORAC-FL and the FRAP test was observed. For compound 3b, this phenomenon was observed in the superoxide scavenging test. According to the CAA assay results, the activity of the new compounds is limited to those oxidative processes in lipophilic media (e.g., bio membranes).
      Graphical abstract image

      PubDate: 2017-05-20T15:17:19Z
      DOI: 10.1016/j.arabjc.2017.05.007
       
  • Influence of metal-support interaction on nitrate hydrogenation over Rh
           and Rh-Cu nanoparticles dispersed on Al2O3 and TiO2 supports

    • Authors: Razvan State; Mariana Scurtu; Akane Miyazaki; Florica Papa; Irina Atkinson; Cornel Munteanu; Ioan Balint
      Abstract: Publication date: Available online 17 May 2017
      Source:Arabian Journal of Chemistry
      Author(s): Razvan State, Mariana Scurtu, Akane Miyazaki, Florica Papa, Irina Atkinson, Cornel Munteanu, Ioan Balint
      Well-defined Rh and Rh-Cu nanoparticles (NP's) of 1.6 nm and 1.3 nm, respectively, were synthesized by alkaline polyol method and then dispersed on insulating (Al2O3) and semiconducting (TiO2) supports. Both colloidal NP's and supported NP's were characterized using various experimental methods (TEM, XPS, XRD, etc) to gather information about their specific morphology, structure and chemical state. The effects of size and support on the catalytic behavior of NP's for nitrate hydrogenation reaction were analyzed. Oxide supports, especially TiO2, were found to have a strong positive effect on the catalytic activity of metallic NP's. The non-supported, colloidal, Rh and Rh-Cu NP's are either inactive or posses very low hydrogenation activity. For supported materials, the intimate contact between two metals (i.e. Rh-Cu) is required to attain good hydrogenation activity. The strong metal-support interaction, induced by hydrogen spillover, is a key point in determining hydrogenation activity. The Rh-Cu NP's dispersed on TiO2 are extremely active for NO3 - and NO2 - (intermediate) deep hydrogenation, with high selectivity for NH4 +. The hydrogenation activity of Rh-Cu NP's supported on Al2O3 is hindered considerably, the main products of NO3 - hydrogenation being NO2 - intermediate.

      PubDate: 2017-05-20T15:17:19Z
      DOI: 10.1016/j.arabjc.2017.05.009
       
  • Controlled drug release behavior of metformin hydrogen chloride from
           biodegradable films based on chitosan/poly(ethylene glycol) methyl ether
           blend

    • Authors: M. Sohail Sarwar; Abdul Ghaffar; Atif Islam; Farhat Yasmin; Zehra Oluz; Eylül Tuncel; Hatice Duran; Asif Ali Qaiser
      Abstract: Publication date: Available online 17 May 2017
      Source:Arabian Journal of Chemistry
      Author(s): M. Sohail Sarwar, Abdul Ghaffar, Atif Islam, Farhat Yasmin, Zehra Oluz, Eylül Tuncel, Hatice Duran, Asif Ali Qaiser
      In this study, novel smart drug release films were prepared by blending chitosan with polyethylene glycol methyl ether (PEGME), also named as methoxy polyethylene glycol (mPEG), for controlled drug release applications. The polymeric films were characterized by Fourier transform infra-red for functional groups analysis, scanning electron microscopy for morphology and X-ray photoelectron spectroscopy for chemical and surface analysis followed by mechanical and thermal analysis. The mechanical properties showed that with the addition of PEGME (40 %), the tensile strength and elongation break was increased up to 34.14 Mpa and 26.40 %, respectively as compared to the controlled sample (without PEGME). The developed biodegradable films were tested for Metformin hydrogen chloride release ability at a particular rate in phosphate buffer saline solution at pH 7.4. The results showed that chitosan/PEGME blends could be employed for controlled drug release and other biomedical applications.
      Graphical abstract image

      PubDate: 2017-05-20T15:17:19Z
      DOI: 10.1016/j.arabjc.2017.05.005
       
  • Diazenyl Schiff Bases: Synthesis, Spectral Analysis, Antimicrobial studies
           and Cytotoxic Activity on Human Colorectal Carcinoma Cell Line (HCT-116)

    • Authors: Harmeet Kaur; Siong Meng Lim; Kalavathy Ramasamy; Mani Vasudevan; Syed Adnan Ali Shah; Balasubramanian Narasimhan
      Abstract: Publication date: Available online 17 May 2017
      Source:Arabian Journal of Chemistry
      Author(s): Harmeet Kaur, Siong Meng Lim, Kalavathy Ramasamy, Mani Vasudevan, Syed Adnan Ali Shah, Balasubramanian Narasimhan
      A series of diazenyl schiff bases have been synthesized by reaction of salicylaldehyde containing azo dyes with various substituted aniline derivatives in presence of acetic acid as catalyst. The structures of diazenyl derivatives were determined by FTIR, UV-vis, 1H NMR, 13C NMR, CHN analysis, fluorimetric and mass spectroscopic studies. The synthesized derivatives were screened for their in vitro antimicrobial activity against various Gram-positive (S. aureus, B. subtilis, B. cereus), Gram-negative (S. typhi, S. enterica, E. coli, P. aeruginosa) bacterial and fungal (C. albicans, A. niger and A. fumigatus) strains, using cefadroxil (antibacterial) and fluconazole (antifungal) as standard drugs. The diazenyl schiff bases were also screened for their cytotoxicity against human colorectal carcinoma cell line (HCT-116) using 5-fluorouracil as standard drug by Sulfo-Rhodamine-B Stain (SRB) assay. The schiff bases exhibited significant activity toward both Gram-positive, Gram-negative bacterial and fungal strains. Most of the synthesized derivatives showed high activity against S. enterica. 4-((2,5-Dichlorophenyl)diazenyl)-2-((3-bromophenylimino)methyl)phenol (SBN-40) was found to be very active against S. aureus, B. cereus and E. coli, with MIC=0.69 (µM/ml X 102). The compound, 4-((2-bromophenyl)diazenyl)-2-((4-nitrophenylimino)methyl)phenol (SBN-13) possessed comparable activity (IC50=7.5 µg/ml) to the standard drug 5-fluorouracil (IC50=3.0 µg/ml) against human colorectal carcinoma cell line (HCT-116).
      Graphical abstract image

      PubDate: 2017-05-20T15:17:19Z
      DOI: 10.1016/j.arabjc.2017.05.004
       
  • Impact of Ionic Liquids on Silver Thermoplastic Composite Membrane
           Polyurethane for Propane/Propylene Separation

    • Authors: Yu Wang; Tee Yong Goh; Peter Goodrich; Mert Atilhan; Majeda Khraisheh; David Rooney; Jillian Thompson; Johan Jacquemin
      Abstract: Publication date: Available online 17 May 2017
      Source:Arabian Journal of Chemistry
      Author(s): Yu Wang, Tee Yong Goh, Peter Goodrich, Mert Atilhan, Majeda Khraisheh, David Rooney, Jillian Thompson, Johan Jacquemin
      This work describes newly synthesized composite polymeric membranes and their utilization in propane/propylene separation in a gas mixture. The nonporous composite polymers were successfully synthesized by using thermoplastic polyurethane (TPU) and several silver salts/silver salts with ionic liquids (ILs). Our studies showed that silver bis(trifluoromethanesulfonyl)imide (Ag[Tf2N]) containing membranes outperformed other silver salt containing membranes in terms of selectivity. In addition, to this finding, ILs, as additives for the membranes, enhanced the selectivity by facilitating improved coordination of the olefin with the silver ions in the dense composite polymers.

      PubDate: 2017-05-20T15:17:19Z
      DOI: 10.1016/j.arabjc.2017.05.008
       
  • An experimental design approach to obtain canthinone alkaloid-enriched
           extracts from Simaba aff. paraensis

    • Authors: Aline de S. Ramos; José Luiz P. Ferreira; Jefferson Rocha de A. Silva; Jefferson D. da Cruz; Danielle L. de Oliveira; Maria A. Mpalantinos da Silva; Silvia L. Basso; Ana Claudia F. Amaral
      Abstract: Publication date: Available online 17 May 2017
      Source:Arabian Journal of Chemistry
      Author(s): Aline de S. Ramos, José Luiz P. Ferreira, Jefferson Rocha de A. Silva, Jefferson D. da Cruz, Danielle L. de Oliveira, Maria A. Mpalantinos da Silva, Silvia L. Basso, Ana Claudia F. Amaral
      The species of the genus Simaba (Simaroubaceae) are found in almost all Brazil and they are used by local population for the treatment of ulcers and malaria. The genus is characterized by the presence of quassinoids and canthinone alkaloids. There is a great interest in canthinones due to important biological activities associated with this class of alkaloids. In this study, methods were developed for obtaining enriched fractions of canthinone alkaloids from Simaba aff. paraensis using experimental factorial design analyzed by gas chromatography. Three alkaloids were detected: canthin-6-one, 4,5-dimethoxycanthin-6-one and the major 9-methoxycanthin-6-one. Within the experimental domain, factorial designs 22 helped establish the minimum amount of solvent and minimum time necessary to obtain extracts enriched in canthinone alkaloids from S. aff. paraensis barks by two extraction methods. These results represent a reduction in costs for obtaining canthinone alkaloids described for the first time in S. aff. paraensis.

      PubDate: 2017-05-20T15:17:19Z
      DOI: 10.1016/j.arabjc.2017.05.002
       
 
 
JournalTOCs
School of Mathematical and Computer Sciences
Heriot-Watt University
Edinburgh, EH14 4AS, UK
Email: journaltocs@hw.ac.uk
Tel: +00 44 (0)131 4513762
Fax: +00 44 (0)131 4513327
 
Home (Search)
Subjects A-Z
Publishers A-Z
Customise
APIs
Your IP address: 54.145.101.33
 
About JournalTOCs
API
Help
News (blog, publications)
JournalTOCs on Twitter   JournalTOCs on Facebook

JournalTOCs © 2009-2016