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  Subjects -> CHEMISTRY (Total: 845 journals)
    - ANALYTICAL CHEMISTRY (51 journals)
    - CHEMISTRY (595 journals)
    - CRYSTALLOGRAPHY (21 journals)
    - ELECTROCHEMISTRY (25 journals)
    - INORGANIC CHEMISTRY (41 journals)
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    - PHYSICAL CHEMISTRY (67 journals)

CHEMISTRY (595 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: 34)
ACS Chemical Neuroscience     Full-text available via subscription   (Followers: 18)
ACS Combinatorial Science     Full-text available via subscription   (Followers: 23)
ACS Macro Letters     Full-text available via subscription   (Followers: 24)
ACS Medicinal Chemistry Letters     Full-text available via subscription   (Followers: 39)
ACS Nano     Full-text available via subscription   (Followers: 244)
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: 8)
Adsorption Science & Technology     Full-text available via subscription   (Followers: 5)
Advanced Functional Materials     Hybrid Journal   (Followers: 51)
Advanced Science Focus     Free   (Followers: 3)
Advances in Chemical Engineering and Science     Open Access   (Followers: 56)
Advances in Chemical Science     Open Access   (Followers: 13)
Advances in Chemistry     Open Access   (Followers: 15)
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: 16)
Advances in Heterocyclic Chemistry     Full-text available via subscription   (Followers: 9)
Advances in Materials Physics and Chemistry     Open Access   (Followers: 21)
Advances in Nanoparticles     Open Access   (Followers: 15)
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: 17)
Advances in Protein Chemistry and Structural Biology     Full-text available via subscription   (Followers: 20)
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: 27)
American Journal of Plant Physiology     Open Access   (Followers: 14)
American Mineralogist     Hybrid Journal   (Followers: 14)
Analyst     Full-text available via subscription   (Followers: 40)
Angewandte Chemie     Hybrid Journal   (Followers: 203)
Angewandte Chemie International Edition     Hybrid Journal   (Followers: 219)
Annales UMCS, Chemia     Open Access   (Followers: 1)
Annals of Clinical Chemistry and Laboratory Medicine     Open Access   (Followers: 4)
Annual Reports in Computational Chemistry     Full-text available via subscription   (Followers: 3)
Annual Reports Section A (Inorganic Chemistry)     Full-text available via subscription   (Followers: 4)
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: 15)
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: 4)
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: 310)
Biochemistry Insights     Open Access   (Followers: 6)
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: 5)
Bioorganic & Medicinal Chemistry     Hybrid Journal   (Followers: 118)
Bioorganic & Medicinal Chemistry Letters     Hybrid Journal   (Followers: 91)
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: 3)
Canadian Journal of Chemistry     Hybrid Journal   (Followers: 10)
Canadian Mineralogist     Full-text available via subscription   (Followers: 4)
Carbohydrate Research     Hybrid Journal   (Followers: 26)
Carbon     Hybrid Journal   (Followers: 66)
Catalysis for Sustainable Energy     Open Access   (Followers: 7)
Catalysis Reviews: Science and Engineering     Hybrid Journal   (Followers: 8)
Catalysis Science and Technology     Free   (Followers: 7)
Catalysis Surveys from Asia     Hybrid Journal   (Followers: 3)
Catalysts     Open Access   (Followers: 8)
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: 14)
Chemical Bulletin of Kazakh National University     Open Access  
Chemical Communications     Full-text available via subscription   (Followers: 72)
Chemical Engineering Research and Design     Hybrid Journal   (Followers: 24)
Chemical Research in Chinese Universities     Hybrid Journal   (Followers: 3)
Chemical Research in Toxicology     Full-text available via subscription   (Followers: 20)
Chemical Reviews     Full-text available via subscription   (Followers: 183)
Chemical Science     Open Access   (Followers: 22)
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: 58)
Chemie-Ingenieur-Technik (Cit)     Hybrid Journal   (Followers: 26)
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: 146)
Chemistry - An Asian Journal     Hybrid Journal   (Followers: 15)
Chemistry and Materials Research     Open Access   (Followers: 20)
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: 44)
Chemistry of Materials     Full-text available via subscription   (Followers: 258)
Chemistry of Natural Compounds     Hybrid Journal   (Followers: 9)
Chemistry World     Full-text available via subscription   (Followers: 22)
Chemistry-Didactics-Ecology-Metrology     Open Access   (Followers: 1)
ChemistryOpen     Open Access   (Followers: 2)
Chemkon - Chemie Konkret, Forum Fuer Unterricht Und Didaktik     Hybrid Journal  
Chemoecology     Hybrid Journal   (Followers: 4)
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)
Clay Minerals     Full-text available via subscription   (Followers: 10)
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: 7)
Combinatorial Chemistry & High Throughput Screening     Hybrid Journal   (Followers: 4)
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: 3)
Copernican Letters     Open Access   (Followers: 1)
Critical Reviews in Biochemistry and Molecular Biology     Hybrid Journal   (Followers: 5)
Crystal Structure Theory and Applications     Open Access   (Followers: 4)
CrystEngComm     Full-text available via subscription   (Followers: 13)
Current Catalysis     Hybrid Journal   (Followers: 2)
Current Metabolomics     Hybrid Journal   (Followers: 5)
Current Opinion in Colloid & Interface Science     Hybrid Journal   (Followers: 9)
Current Opinion in Molecular Therapeutics     Full-text available via subscription   (Followers: 17)
Current Research in Chemistry     Open Access   (Followers: 8)
Current Science     Open Access   (Followers: 61)
Dalton Transactions     Full-text available via subscription   (Followers: 23)
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: 3)
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: 3)
Environmental Chemistry     Hybrid Journal   (Followers: 7)
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  [3051 journals]
  • Synthesis, physicochemical elucidation, biological screening and molecular
           docking studies of a Schiff base and its metal(II) complexes

    • Authors: Abdur Rauf; Afzal Shah; Abdul Aziz Khan; Aamir Hassan Shah; Rashda Abbasi; Irfan Zia Qureshi; Saqib Ali
      Pages: 155 - 167
      Abstract: Publication date: Available online 10 October 2017
      Source:Arabian Journal of Chemistry
      Author(s): Abdur Rauf, Afzal Shah
      A Schiff base 1-((3-nitrophenylimino)methyl)naphthalen-2-olate (HL) and its two novel complexes with Zn(II) and Co(II) metals were successfully synthesized and characterized by FTIR, 1H NMR, 13C NMR, elemental analysis, magnetic susceptibility, TGA and EIS-MS. Crystal of Schiff base was also characterized by X-ray analysis and experimental parameters were found in line with the theoretical parameters. Quantum mechanical approach was also used to compare structural and calculated parameters and to ensure the geometry of metal complexes. The photometric behaviors of all the synthesized compounds were investigated in a wide pH range using BR buffers. Appearance of isosbestic point suggested the existence of Schiff base molecules in different tautomeric forms. Binding of synthesized complexes with calf thymus DNA was explored by photometric and voltammetric titrations and binding constants were calculated. The results indicated that ligand and its metal complexes bind to DNA by intercalation mode. Docking studies indicate their binding possibilities with topoisomerase II. Moreover, all these prepared compounds were screened for enzyme inhibition, antibacterial, cytotoxic and in vivo antidiabetic activities and found active against one or other activity. This effort just provides preliminary data for some biological properties and which can act as foundation stone for their application in drug development.

      PubDate: 2017-10-10T23:09:49Z
      DOI: 10.1016/j.saa.2017.01.018
      Issue No: Vol. 176 (2017)
       
  • Potentiometric and surface topography studies of new carbon-paste sensors
           for determination of thiamine in Egyptian multivitamin ampoules

    • Authors: Yousry M. Issa; Fekria M. Abou Attia; Omaima E. Sherif; Ahmed S. Abo Dena
      Pages: 751 - 760
      Abstract: Publication date: September 2017
      Source:Arabian Journal of Chemistry, Volume 10, Issue 6
      Author(s): Yousry M. Issa, Fekria M. Abou Attia, Omaima E. Sherif, Ahmed S. Abo Dena
      We report here for the first time two potentiometric carbon-paste sensors for determination of thiamine chloride hydrochloride in aqueous solutions. The proposed sensors use the ion-pair of thiamine with tetraphenylborate as an electro-active species and dibutyl phthalate (sensor I) or o-nitrophenyloctyl ether (sensor II) as solvent mediators. The effect of solvent mediator was studied using dibutyl phthalate, o-nitrophenyloctyl ether, ethylhexyl adipate, dioctyl phthalate, tricresyl phosphate and paraffin oil. The slopes of the calibration graphs are 29.49±0.24 and 29.60±0.15mV/decade for sensors (I) and (II), respectively. The sensors are able to detect down to 5.25×10−6 and 3.57×10−6 for (I) and (II), respectively. Both sensors show reasonable thermal stability and fast response time. The selectivity coefficients obtained from the matched potential method indicate high selectivity of the proposed sensors toward thiamine over commonly interfering cations. Sensor (I) has a lifetime of only 1–2days; however, sensor (II) remains usable for up to one month. Analytical applications to pure solutions and Egyptian multivitamin ampoules show excellent recovery values ranging from 97.92 to 103.72% and 97.21 to 102.19% for sensors (I) and (II), respectively. Moreover, the precision and reproducibility of the sensors are indicated from the low values of %RSD of five replicate measurements. In addition, the surface topography of the sensors was studied using scanning electron microscopy to investigate the effect of chemical modification on the surface structure.

      PubDate: 2017-09-06T14:51:18Z
      DOI: 10.1016/j.arabjc.2016.11.012
       
  • Synthesis, characterization, thermal and catalytic properties of a novel
           carbazole derived Azo ligand and its metal complexes

    • Authors: Selma Bal; Joseph Donald Connolly
      Pages: 761 - 768
      Abstract: Publication date: September 2017
      Source:Arabian Journal of Chemistry, Volume 10, Issue 6
      Author(s): Selma Bal, Joseph Donald Connolly
      This work explains the synthesis of a new azo-Schiff base compound, derived from condensation between N-ethylcarbazole-3-carbaldehyde and 1,3-diaminopropane, followed by azo coupling reaction with the diazonium salt of 2-amino-4-methyl phenol. The newly synthesized azo-Schiff base was further reacted with the acetate salts of Copper, Cobalt and Nickel to give three coordination compounds. All synthesized compounds have been characterized through spectral analysis. The coordination compounds have been examined for their thermal and catalytic features. Good and moderate yields were obtained for the oxidation of styrene and cyclohexene. Thermal features of the ligand and its complexes have been explained and the results obtained have supported the proposed structures.

      PubDate: 2017-09-06T14:51:18Z
      DOI: 10.1016/j.arabjc.2015.11.012
       
  • DFT analysis and bioactivity of 2-((E)-(4-methoxybenzylimino)methyl)phenol
           and its Ni(II) and Pd(II) complexes

    • Authors: Amalina Mohd Tajuddin; El Hassane Anouar; Kalavathy Ramasamy; Bohari M. Yamin; Abdulrahman I. Alharthi; Hadariah Bahron
      Pages: 769 - 780
      Abstract: Publication date: September 2017
      Source:Arabian Journal of Chemistry, Volume 10, Issue 6
      Author(s): Amalina Mohd Tajuddin, El Hassane Anouar, Kalavathy Ramasamy, Bohari M. Yamin, Abdulrahman I. Alharthi, Hadariah Bahron
      This paper reports the synthesis, characterisation and DFT analysis of an N,O bidentate Schiff base, ((E)-(4-methoxybenzylimino)methyl)phenol, (L1c) and its Ni(II) and Pd(II) complexes. The structures were elucidated via elemental analysis, UV–Visible, NMR, IR and single crystal X-ray diffraction. Complexation of L1c with Ni(II) and Pd(II) was observed to induce different degrees of bathochromic effect on n→π∗ and π→π∗ electronic transitions. A comparison of the experimental data of UV–Visible, NMR, IR and X-ray with those calculated using DFT and TD-DFT methods where five hybrid functionals were tested in gas, IEF-PCM and SS-PCM models was also carried out. The results show that the reproduction of maximum absorption bands n→π∗ and π→π∗ is strongly related to the tested hybrid functionals and solvatochromic effects. Relatively good concordance was obtained between experimental and calculated NMR chemical shifts, IR and X-ray parameters. A bioactivity evaluation against HCT116 and Escherichia coli displayed that the parent ligand L1c is a more superior anticancer and antibacterial agent than the positive controls of 5FU and gentamicin respectively. However, both complexes showed poor activity as anticancer agent and no activity observed against tested bacteria.

      PubDate: 2017-09-06T14:51:18Z
      DOI: 10.1016/j.arabjc.2016.11.005
       
  • Correlation between crystallite size and photocatalytic performance of
           micrometer-sized Monoclinic WO3 particles

    • Abstract: Publication date: Available online 14 November 2017
      Source:Arabian Journal of Chemistry
      Author(s): Asep Bayu Dani Nandiyanto, Rena Zaen, Rosi Oktiani
      The correlation between crystallite size and the characteristics of micrometer-sized photocatalyst particles was investigated. As a model of photocatalyst, monoclinic tungsten trioxide particles with controllable crystallite sizes were used. The crystallite size was controlled independently in the constant particle outer diameters to comprehend the crystallite size parameters precisely. To minimize the misleading photocatalytic measurements due to the over-dominancy of other catalytic parameters (such as excessive surface area and quantum confinement effect), the present study utilized micrometer-sized particles. The results revealed that in the constant process condition, the photocatalytic properties were strongly dependent on the material crystallinity. Increases in the crystallite sizes had a strong influence to the enhancement of the photodecomposition rate of organic material. The tendency for the impact of crystallite size was also confirmed by varying the number of catalysts in the photocatalytic process. To confirm the analysis of photocatalysis, the study was completed with the theoretical consideration and the proposal of the particle formation as well as the phenomena that happen during the photocatalytic process.

      PubDate: 2017-11-16T08:54:52Z
       
  • A Theoretical Assessment of Antioxidant Capacity of Flavonoids by means of
           Local Hyper–Softness

    • Abstract: Publication date: Available online 13 November 2017
      Source:Arabian Journal of Chemistry
      Author(s): Claudia Sandoval-Yañez, Carolina Mascayano, Jorge I. Martínez-Araya
      A theoretical reactivity descriptor to estimate local reactivity on molecules was tested to assess the antioxidant capability of some flavonoids. It was validated by comparison with experimental precedents published already by Firuzi et al. (2005). The aforementioned reactivity index is called local hyper-softness (LHS). This parameter was applied on HO- substituent groups on the same set of flavonoids within each subclassification: flavones (apigenin and baicalein), flavonols (fisetin, galangin, 3–OH flavone, kaempferol, myricetin, and quercetin), flavanones (hesperetin, naringenin, taxifolin) and isoflavones (daidzein and genistein). Experimental values of both techniques, ferric reducing antioxidant power (FRAP) and anodic oxidation potential (Eap) were retrieved from Firuzi et al. (2005) with the purpose of validating the calculated LHS values. Excepting myricetin, the LHS values of all these compounds matched in a similar order relationship experimentally obtained by means of Eap and FRAP from Firuzi et al. (2005). Our results revealed that LHS is a suitable theoretical parameter to get an insight concerning to the antioxidant capacity of these compounds, in particular, LHS allows explaining experimentally obtained values of FRAP along with Eap values in terms of reactivity of HO- substituent groups belonging these molecules theoretically computed without including experimental parametes.

      PubDate: 2017-11-16T08:54:52Z
       
  • In-vitro cytotoxicity evaluation of surface design luminescent lanthanide
           core/shell nanocrystals

    • Abstract: Publication date: Available online 11 November 2017
      Source:Arabian Journal of Chemistry
      Author(s): Anees A. Ansari, Shahanavaj Khan, A. Aldalbahi, Abdul K. Parchur, B. Kumar, Ashok Kumar, Mohammad Raish, S.B. Rai
      Lanthanide nanocrystals (NCs) are the most promising luminescent materials for bioapplications, but their use is hindered by difficulties in obtaining biocompatible and photoluminescence lanthanide NCs. To solve this problem, a simple and versatile strategy was developed for improving the luminescence efficiency with the hydrophilicity of the lanthanide NCs. In this study, the effects of shell formation on structural, morphological, and optical properties (optical absorption, band-gap energy, excitation, emission, and luminescent decay time) were evaluated. To improve the luminescence efficiency and aqueous dispersion, luminescent core-NCs were encapsulated with inert NaGdF4 and amorphous silica layers. These surface coating layers significantly improved the luminescence efficiency and dispersion of the core/shell NCs in which the silica surface provides a negatively charged surface to the NCs at physiological pH. Optical properties of these NCs strongly depend on the external change of NCs, demonstrating the impact of coating in improving the luminescence efficiency. The outcomes can be ascribed to the development of surface chemical bonds betweencore/shell and noncrystalline SiO2 shell via Gd–O–Si bridges, activating the ‘dormant’ Ce3+ and Tb3+ ions on the surface of NCs. An intensive emission and good hydrophilic property from the active functional groups in solutions show a great potential for applications such as multi-analyte fluorescent biolabeling, optical biosensing, staining, display, and other optical technologies. The core/shell/SiO2 NCs showed higher nontoxicity and biocompatibility with respect to the core NCs because of biocompatible silica surface modification, facilitating entry into the living cells. Therefore, this developed synthesis approach might advance the field of biomolecule-based nanotechnology in near future.

      PubDate: 2017-11-16T08:54:52Z
       
  • Optimization and Detailed Stability Study on Pb Doped Ceria Nanocubes for
           Enhanced Photodegradation of Several Anionic and Cationic Organic
           Pollutants

    • Abstract: Publication date: Available online 11 November 2017
      Source:Arabian Journal of Chemistry
      Author(s): Shajahan Shanavas, Arumugam Priyadharsan, Rajendran Ramesh, Ponnusamy Munusamy Anbarasan
      A series of Pb doped CeO2 nanocubes with seven different Pb loadings (2-12 mol%) were synthesized via modified hydrothermal technique. The prepared samples were characterized by XRD, XPS, FT-IR, TGA, SEM, HR-TEM, EDS and UV-Vis DRS analysis. According to XRD analysis, the crystalline structure of synthesized pure CeO2 and Pb-doped CeO2 samples are cubic structure. The ceria nanocubes showed an increase in amount of oxygen vacancies with increasing the dopant concentrations. When the doping level of Pb is 6 mol%, the optical band gap of Pb-CeO2 is smaller than that of pure CeO2 nanocubes. The HR-TEM results confirms the cubic structure of 6% Pb-CeO2 with average crystallite size of about 15 nm. The photocatalytic ability of Pb-CeO2 catalysts were studied by degrading several anionic and cationic organic pollutants like methylene blue (MB), methylene orange (MO), methylene red (MR), rhodamine B (RhB), reactive blue 160 (RB160), salicylic acid (SA), coumarin and phenol. The 6% Pb-CeO2 nanocubes shows better photocatalytic performance against anionic dyes especially for MB. To find the optimum condition for better photocatalytic performance of 6% Pb-CeO2 nanocubes, the photocatalytic process was conducted in different initial reaction conditions like reaction temperature, catalytic dosage, dye concentration and pH of the reaction solution. The stability and recyclability of 6% Pb-CeO2 photocatalyst was studied by XRD, FT-IR and EDS analysis after 5 cycles of MB degradation. The hydroxyl radical estimation and trapping experiments were conducted to observe the photocatalytic mechanism process in 6% Pb-CeO2 nanocubes. The perfect doping concentration for better organic pollutant degradation by Pb-CeO2 is found to be 6 mol% of Pb.

      PubDate: 2017-11-16T08:54:52Z
       
  • Influence of a ligand nature on the in situ laser-induced synthesis of the
           electrocatalytically active copper microstructures

    • Abstract: Publication date: Available online 10 November 2017
      Source:Arabian Journal of Chemistry
      Author(s): Lev S. Logunov, Maxim S. Panov, Liubov A. Myund, Ilya I. Tumkin, Evgeniia M. Khairullina, Mikhail N. Ryazantsev, Irina A. Balova, Vladimir A. Kochemirovsky
      In this work we demonstrate the role of a ligand in formation of the conductive and electrocatalytically active copper microstructures produced using the in situ laser-induced metal deposition technique. For this purpose, the alkaline solutions of different concentrations containing copper(II) chloride and Rochelle salt, which is used as ligand and exhibits both coordination and reduction properties, were studied by ATR-FTIR, UV-Vis, and Raman spectroscopy. According to spectroscopic studies and theoretical considerations, it was observed that at certain concentrations and proportion of copper(II) chloride and sodium potassium tartrate, and also within pH range between 7 and 13 the components of the plating copper solution forms tartrate copper complex, in which copper ion is coordinated by four hydroxyl groups of the ligand and two hydroxyl groups of the environment. As a result, the laser-induced deposition from solutions, where copper coordination occurs via hydroxyls rather than through other functional groups (e.g. carboxylate), results in the synthesis of sensory active materials. Furthermore, we figured out that the presence of the reducing agents such as polyols in the plating copper solution also enhances the electrical conductivity and electrochemical characteristics of the resulting copper microdeposits, among which sorbitol displays the most attractive results. Thus, it was shown that the regime of copper coordination in an organic ligand and number of hydroxyl groups in a ligand and a reducing agent directly affect the properties of the synthesized copper microstructures. In addition, the overall results obtained in this study are quite useful for better understanding the mechanisms of the laser-induced metal deposition process, and very perspective for development and design of new non-enzymatic electrochemical sensors and biosensors.
      Graphical abstract image

      PubDate: 2017-11-16T08:54:52Z
       
  • Layered magnetite nanoparticles modification –synthesis, structure, and
           magnetic characterization

    • Abstract: Publication date: Available online 9 November 2017
      Source:Arabian Journal of Chemistry
      Author(s): U. Klekotka, D. Satula, P. Nordblad, B. Kalska-Szostko
      Core-shell and multilayered nanoparticles based on magnetite core with different metallic spacing and over-layers are prepared in one pot synthesis and characterized. The spacer layers were made from Au, Cu or Ag precursors. The nanoparticles were fabricated by a modified chemical seed based method. The obtained nanoparticles were examined by X-ray diffraction, Energy-dispersive X-ray spectroscopy, Transmission Electron Microscopy, Differential Scanning Calorimetry and Infrared spectroscopy. Magnetic properties of the nanoparticles were tested by Mössbauer spectroscopy and Magnetometry. Magnetization and Mössbauer measurements show that the presence of the metallic layers influences the magnetic state of the particles. XRD and EDX confirm layered structures of nanoparticles. Proposed synthesis allows for fabrication of layered particles with controlled morphology and register properties changes which are related to the nature of each subsequent layer.

      PubDate: 2017-11-16T08:54:52Z
       
  • Synthesis of novel naphtho[1,2-e][1,3]oxazines bearing an arylsulfonamide
           moiety and their anticancer and antifungal activity evaluations

    • Abstract: Publication date: Available online 2 November 2017
      Source:Arabian Journal of Chemistry
      Author(s): Seyed Gholamhossein Mansouri, Hassan Zali-Boeini, Kamiar Zomorodian, Bahman Khalvati, Razie Helali Pargali, Ali Dehshahri, Hadi Amiri Rudbari, Mehdi Sahihi, Zahra Chavoshpour
      A series of novel naphtho[1,2-e][1,3]oxazines bearing arylsulfonamide moiety have been synthesized via a one-pot approach and in a green reaction medium. These new naphtho[1,2-e][1,3]oxazine derivatives have been characterized by their 1H NMR, 13C NMR and the X-ray single crystallography method for compound 7a. All the newly synthesized compounds were examined for their in vitro anticancer activity against breast (MCF-7), colon (HCT116), and B-CLL (Waco3-CD5) cancers. Some of these compounds such as 7j and 7l showed remarkable activities against MCF-7 (breast) and HCT116 (colon) cancers with comparable IC50 (The half maximal inhibitory concentration) values as that of known drugs such as 5-fluorouracil (5-FU). In vitro antimicrobial activities of all compounds were also evaluated against five human pathogenic fungi strains and two bacteria (one gram positive and one gram negative). The best MICs (Minimum Inhibitory Concentrations) were found against the C. albicans.
      Graphical abstract image

      PubDate: 2017-11-16T08:54:52Z
       
  • Evaluation of non-covalent interactions of chlorambucil (monomer and
           dimer) and its interaction with biological targets: Vibrational frequency
           shift, electron density topological and automated docking analysis

    • Abstract: Publication date: Available online 2 November 2017
      Source:Arabian Journal of Chemistry
      Author(s): T. Karthick, Poonam Tandon, Karnica Srivastava, Swapnil Singh
      Chlorambucil is a well-known chemotherapy drug that is being used to treat chronic myelogenous leukemia. As it contains ten flexible rotational bonds, the possible spatial conformations have been identified theoretically. The spectral signatures of monomer and dimer structures of chlorambucil and the frequency shifts due to non-covalent interactions (NCIs) have been illustrated using FT-IR and FT-Raman spectra. The bond correlation between carbon and hydrogen nuclei of chlorambucil has been obtained using 2D-HSQC NMR spectrum. The assignments of harmonic normal modes have been done in order to find the vibrational contributions of each functional group. Besides the spectroscopic studies, the electron density based quantum topological atoms in molecule analysis have been performed to explore the possible interactions between the non-bonded atoms. The reduced density gradient and isosurface plots have been used in this study to understand the strength of NCIs. The charge delocalization patterns of monomer and dimer structures were explained so as to investigate the chemical stability profile. The active sites for the electrophilic and nucleophilic attack on the monomer conformers have been determined by applying Hirshfeld charges and atomic spin densities into Fukui and Parr functions, respectively. From the automated docking analysis, it is found that chlorambucil interacts with the aldo-keto reductase family 1 (AKR1B1, AKR1B10, AKR1B15) and FAD-linked sulfhydryl oxidase ALR proteins through strong hydrogen bonds and shows a potential inhibition. In order to take into account the interactions ranging from short to long range, the modern density functionals viz. M06-2X, wB97XD, B97D which includes dispersion-corrected repulsion terms have been employed and the theoretical results were found coincide with the experimental observations.

      PubDate: 2017-11-16T08:54:52Z
       
  • Electrocatalytic activity of starch/Fe3O4/zeolite bionanocomposite for
           oxygen reduction reaction

    • Abstract: Publication date: Available online 6 November 2017
      Source:Arabian Journal of Chemistry
      Author(s): Nurul Hidayah Abdullah, Kamyar Shameli, Pooria Moozarm Nia, Mohammad Etesami, Ezzat Chan Abdullah, Luqman Chuah Abdullah
      The present work demonstrated an eco-friendly and facile method for the preparation of starch/Fe3O4/zeolite-bionanocomposite (BNC) at moderate temperature. Zeolite and starch were used as solid support and stabilizer. The analysis of UV-vis showed the appearance of surface plasmon resonance. From PXRD analysis, the incorporation of magnetite nanoparticles (NPs) in zeolite substrate results in reducing of intensities and broadening of the zeolite peaks of BNC. The TEM analysis showed the formation of highly distributes spherical Fe3O4-NPs with an average diameter and standard deviation of 9.24 ± 3.57 nm. The FESEM and EDX analyses imply that Fe3O4-NPs were homogeneously formed on the surface of the zeolite substrate. VSM analysis illustrated the as prepared BNC possessed magnetic behaviour with a saturation magnetization and coercivity of 1.84 emu.g-1 and 17.76 G, respectively. The prepared BNC showed potential applicability in energy as low-cost electrode material. The BNC was used as a non-precious catalyst for oxygen reduction reaction (ORR) in the alkaline medium. The presence of starch and zeolite promoted long term stability up to 1000 cycles and avoid the dissolution and agglomeration of iron oxide. The ORR commences at the onset potential of 0 V follows by the two successive reduction peaks at −0.48 V and −1.00 V.

      PubDate: 2017-11-09T10:19:12Z
       
  • Adsorption thermodynamics of cationic dyes (methylene blue and crystal
           violet) to a natural clay mineral from aqueous solution between 293.15 and
           323.15 K

    • Abstract: Publication date: Available online 4 November 2017
      Source:Arabian Journal of Chemistry
      Author(s): Omer SakinOmer, Mohammed Ali Hussein, Belal H.M. Hussein, ArbiMgaidi
      Wastewater from dyestuff production is one of the main water pollutants. Several methods have been applied for the remediation of contaminated water. Currently, adsorption using a cheap, abundant, and environmental-friendly adsorbent such as natural clay is the simplest and most useful method. This study aimed to determine the enthalpies of adsorption of the organic cationic dyes, methylene blue (MB) and crystal violet (CV), from polluted water onto a natural clay mineral. Early on, we performed mineralogical and textural analyses of a clay sample using various techniques, namely X-ray diffraction, scanning electron microscopy/energy dispersive X-ray spectroscopy, Brunauer-Emmett-Teller analysis, Fourier-transform infrared spectroscopy, and differential scanning calorimetry, before and after adsorption. The experimental results showed that this adsorbent is a mesoporous and non-swelling clay with illite and kaolinite as the major components. The effects of various parameters such as contact time, pH, and temperature were examined. The experimental data were analyzed using the linear forms of the Langmuir and Freundlich isotherm models and showed a good fit with the Langmuir equation for MB adsorption. Thermodynamic parameters such as the changes in Gibbs free energy, enthalpy, and entropy were determined from batch experiments. Results revealed that the adsorption of MB onto illitic clay was endothermic, while that of CV was an exothermic and spontaneous process.

      PubDate: 2017-11-09T10:19:12Z
       
  • Sodium alginate-g-poly(acrylic acid-co-2-hydroxyethyl
           methacrylate)/montmorillonite superabsorbent composite: Preparation,
           swelling investigation and its application as a slow-release fertilizer

    • Abstract: Publication date: Available online 4 November 2017
      Source:Arabian Journal of Chemistry
      Author(s): El-Refaie kenawy, Mohamed M. Azaam, Esraa M. El-nshar
      Sodium alginate-g-poly(acrylic acid-co-2-hydroxyethyl methacrylate)/montmorillonite superabsorbent composites (SACs) were prepared by graft copolymerization of acrylic acid (AA) and 2-hydroxyethyl methacrylate (HEMA) onto sodium alginate (Na-Alg) in the presence of montmorillonite (MMT) using N,N'-methylenebisacrylamide (MBA) as a crosslinker and potassium persulfate (KPS) as an initiator in aqueous solution. The composite structures were characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), Thermal Gravimetric Analysis (TGA) and Scanning Electron Microscope (SEM). The effect of % initiator, crosslinker amount and clay ratio on the swelling capacity was investigated. The results indicated that the highest swelling capacity of the composites in distilled water was 752 g/g by using 1.25 % KPS and 0.06 % MBA, 75 % AA, 6.25 % HEMA and 12.5 % Na-Alg. Different samples were loaded with urea to evaluate their release potentials, and the release was studied by measuring the conductivity. The amount of urea release increased with increasing MMT amount.

      PubDate: 2017-11-09T10:19:12Z
       
  • Inside Front Cover - Editorial Board

    • Abstract: Publication date: November 2017
      Source:Arabian Journal of Chemistry, Volume 10, Issue 7


      PubDate: 2017-11-09T10:19:12Z
       
  • Speed of sound and isentropic compressibility of benzonitrile,
           chlorobenzene, benzyl chloride and benzyl alcohol with benzene from
           various models at temperature range 298.15–313.15K

    • Abstract: Publication date: November 2017
      Source:Arabian Journal of Chemistry, Volume 10, Issue 7
      Author(s): R.K. Shukla, Atul Kumar, Naveen Awasthi, Urvashi Srivastava, Kirti Srivastava
      Densities and speed of sound were measured for the binary liquid mixtures formed by benzonitrile, chlorobenzene, benzyl chloride and benzyl alcohol with benzene at 298.15, 303.15, 308.15 and 313.15K and atmospheric pressure over the whole concentration range. Prigogine–Flory–Patterson model (PFP), Ramaswamy and Anbananthan (RS) model and model suggested by Glinski, were utilized to predict the associational behavior of weakly interacting liquids. The measured properties were fitted to Redlich–Kister polynomial relation to estimate the binary coefficients and standard errors. An attempt has also been made to study the molecular interactions involved in the liquid mixture from observed data. Furthermore, the McAllister multi body interaction model was also used to correlate the binary properties. These models were compared and tested for different systems showing that the associated processes yield fair agreement between theory and experiment as compared to non-associated processes.

      PubDate: 2017-11-09T10:19:12Z
       
  • Determination of macro, essential trace elements, toxic heavy metal
           concentrations, crude oil extracts and ash composition from Saudi Arabian
           fruits and vegetables having medicinal values

    • Abstract: Publication date: November 2017
      Source:Arabian Journal of Chemistry, Volume 10, Issue 7
      Author(s): Hana R. Alzahrani, Hope Kumakli, Emmanuel Ampiah, Tsdale Mehari, Austin J. Thornton, Carol M. Babyak, Sayo O. Fakayode
      The concentrations of essential elements (Mg, Ca, Na, K, Fe, Zn, Se, Al, Ni, and Cu) and toxic heavy metals (Pb, As, Cr, Cd, and Cr) from Saudi Arabian fruits and vegetables were determined by inductively coupled plasma optical emission spectrophotometry (ICP/OES). Two types of butters, Caralluma munbayana and Caralluma hesperidum, Vigna (Vigna unguiculata), common fig (Ficus carica), Annona seeds (Annonaceae seeds), Annona fruits (Annonaceae fruits), Fennel (Foeniculum vulgare), and Fennel flowers (Nigella sativa) were investigated, because they are used by indigenous groups as traditional medicines with Soxhlet-extraction and dry-ashing protocol. The estimated daily dietary element intake in food samples was further calculated in order to evaluate the element dietary intake and fruit and vegetable consumption pattern of the indigenes of Saudi Arabia. The crude oil and ash compositions varied widely, but suggested that most of the foods were good sources of oils and minerals. The figures-of-merit of the ICP-OES calibration curves were excellent with good linearity (R 2 >0.9921). The use of ICP-OES in this study allowed the accurate analysis and the detection of the elements at low levels. Essential elements (K, Ca, Na, and Mg) had the highest concentrations while toxic heavy metals (As, Pb, and Cd) had the lowest in the foods. Essential element pairs (Mg-Na, Mg-Ca, Fe-Al) were highly correlated, suggesting that these foods are sources of multiple nutrients. Toxic element pairs (Pb-Cd, Pb-As, and Cd-As), however, were poorly correlated in the foods, suggesting that these elements do not have a common source in these foods. Average consumption of these foods should provide the recommended daily allowances of essential elements, but will not expose consumers to toxic heavy metals. The ICP-OES method was validated by determining method detection limits and percent recoveries of laboratory-fortified blanks, which were generally 90–100%.

      PubDate: 2017-11-09T10:19:12Z
       
  • Elaboration of modified poly(NiII-DHS) films as electrodes by the
           electropolymerization of Ni(II)-[5,5′-dihydroxysalen] onto indium tin
           oxide surface and study of their electrocatalytic behavior toward
           aliphatic alcohols

    • Abstract: Publication date: November 2017
      Source:Arabian Journal of Chemistry, Volume 10, Issue 7
      Author(s): Ali Ourari, Bouzid Ketfi, Larbi Zerroual
      Nickel(II)-DHS complex was obtained from N,N′-bis(2,5-dihydroxybenzylidene)-1,2-diaminoethane (H2DHS) ligand and nickel acetate tetrahydrated in ethanolic solution with stirring under reflux. This complex, dissolved in an alkaline solution, was oxidized to form electroactive films strongly adhered on the ITO (indium tin oxide) electrode surface. In this alkaline solution, the poly-[NiII-DHS]/ITO films showed the typical voltammetric response of (Ni2+/Ni3+) redox couple centers which are immobilized in the polymer-film. The modified electrodes (MEs) obtained were also characterized by several techniques such as scanning electronic microscopy, atomic force microscopy and electrochemical methods. The electrocatalytic behavior of these MEs toward the oxidation reaction of some aliphatic alcohols such as methanol, ethanol, 2-Methyl-1-propanol and isopropanol was investigated. The voltammograms recorded with these alcohols showed good electrocatalytic efficiency. The electrocatalytic currents were at least 80 times higher than those obtained for the oxidation of methanol on electrodes modified with nickel hydroxide films in alkaline solutions. We noticed that these electrocatalytic currents are proportional to the concentration of methanol (0.050–0.30μM). In contrast, those recorded for the oxidation of other aliphatic short chain alcohols such as ethanol, 2-methyl-1-propanol and isopropanol are rather moderately weaker. In all cases the electrocatalytic currents presented a linear dependence with the concentration of alcohol. These modified electrodes could be applied as alcohol sensors.

      PubDate: 2017-11-09T10:19:12Z
       
  • Rapid synthesis of a corncob-based semi-interpenetrating polymer network
           slow-release nitrogen fertilizer by microwave irradiation to control water
           and nutrient losses

    • Abstract: Publication date: November 2017
      Source:Arabian Journal of Chemistry, Volume 10, Issue 7
      Author(s): Peng Wen, Yajie Han, Zhansheng Wu, Yanhui He, Bang-Ce Ye, Jun Wang
      This paper presents the rapid synthesis of a corncob-based semi-interpenetrating polymer network (semi-IPN) slow-release nitrogen fertilizer (SRFs) with bentonite additives via microwave irradiation at 320W for 4.5min. The SRFs were based on urea incorporated in a polymer matrix composed of corncob-g-poly(acrylic acid)/bentonite network and linear polyvinylpyrrolidone. The structure and properties of the sample were characterized. Swelling measurements and water-retention studies indicated that the water absorbency of the SRFs was 1156g/g in distilled water and that the water-retention capacity of the soil with 2% SRFs was 20.3% after 30days. In addition, the SRFs possessed lower N leaching loss amount (13.2%) and N migrate-to-surface loss amount (6.8%) compared with urea. The SRFs could effectively reduce the N release rate (56.6% of N was released after 30days) and consequently facilitate the growth of cotton plants. Thus, the high-performance SRFs capable of controlling water and N losses could be widely applied to agricultural fields, and microwave irradiation could be a significant strategy to produce SRFs.

      PubDate: 2017-11-09T10:19:12Z
       
  • Role of heterojunction ZrTiO4/ZrTi2O6/TiO2 photocatalyst towards the
           degradation of paraquat dichloride and optimization study by Box–Behnken
           design

    • Abstract: Publication date: November 2017
      Source:Arabian Journal of Chemistry, Volume 10, Issue 7
      Author(s): Nur Afiqah Badli, Rusmidah Ali, Wan Azelee Wan Abu Bakar, Leny Yuliati
      This study revealed that the existence of heterojunction of ZrTiO4/ZrTi2O6/TiO2 in the photocatalyst system has significantly enhanced the photodegradation of paraquat dichloride with respect to the increment of it thermal stability as shown in the XRD and XPS analyses. Several parameters such as ZrO2/TiO2 ratios (10:90, 20:80 and 30:70) and catalyst dosage (0.1–0.4g) have been studied to achieve the optimum degradation of paraquat dichloride. The kinetic study was determined by using various ZrO2/TiO2 ratios calcined at 750°C and showed that the photodegradation of paraquat over ZrO2/TiO2 photocatalyst follows a pseudo first-order kinetic. The optimum condition was obtained using ZrO2/TiO2 (20:80), calcined at 750°C and with 0.3g catalyst dosage which gave 84.41% degradation after 240min under UV irradiation, λ UV =365nm. The N2 adsorption–desorption analysis shows the mixture of Type III and IV isotherms with hysteresis loop type H2(b). Meanwhile, the Box–Behnken design showed the optimum photodegradation of paraquat was obtained at the calcination temperature of 750°C, with the ZrO2/TiO2 ratio of 20:80 and 0.3g catalyst dosage which was 0.24% lower than our experimental verification result.

      PubDate: 2017-11-09T10:19:12Z
       
  • Disperse dyeing and antibacterial properties of nylon and wool fibers
           using two novel nanosized copper(II) complexes bearing phosphoramide
           ligands

    • Abstract: Publication date: November 2017
      Source:Arabian Journal of Chemistry, Volume 10, Issue 7
      Author(s): Zahra Shariatinia, Shahla Shekarriz, Hourieh Sadat Mirhosseini Mousavi, Narges Maghsoudi, Zahra Nikfar
      Disperse dyeing of nylon and wool fibers with two new nanosized copper(II) complexes including phosphoric triamide ligands with formula Cu(NO3)2L2 (1) and Cu(CH3COO)2L2 (2) where L=4-NO2C6H4NHP(O)(NC4H8O)2 (A) was performed successfully. Both complexes 1 and 2 produced yellow and green colored nylon and wool fabrics, respectively. The complexes were synthesized by ultrasonic method and characterized by 1H, 13C, 31P NMR, Fourier-transform infrared, photoluminescence, ultraviolet–visible spectroscopy, X-ray diffraction, field-emission microscopy and elemental analysis. The FE-SEM micrographs revealed that the nanoparticles of these compounds are spherical in morphology and ∼17–20nm in size. Very appropriate washfastness while poor lightfastness results were deduced for the dyed fibers. The in vitro antibacterial activities of the dyes 1, 2 and dyed wool/nylon fibers against the Gram-positive Bacillus subtilis bacterium illustrated increasing in the antibacterial effect by increasing the dye concentration from 0.1% to 0.5% o.w.f. on both wool and nylon dyed fibers.

      PubDate: 2017-11-09T10:19:12Z
       
  • Characterization of a low cost Lagenaria vulgaris based carbon for
           ranitidine removal from aqueous solutions

    • Abstract: Publication date: November 2017
      Source:Arabian Journal of Chemistry, Volume 10, Issue 7
      Author(s): Danijela Bojić, Milan Momčilović, Dragan Milenković, Jelena Mitrović, Predrag Banković, Nena Velinov, Goran Nikolić
      Practical aspects of Lagenaria vulgaris shell conversion to activated carbon were examined along with its use in ranitidine adsorption. Kinetics and isotherms of adsorption onto Lagenaria vulgaris carbon (LVC) were correlated to several theoretical adsorption models. The best fit was found in the case of Langmuir and pseudo-second-order model indicating monolayer adsorption. The influence of pH under kinetic study showed slightly hindered adsorption below pH 4. The optimal adsorbent dosage was set to 1g/L. LVC was characterized by several complementary techniques, including wet chemical techniques such as Boehm’s titrations and determination of pHPZC and pH of LVC, which revealed neutral nature of the adsorbent. N2 sorptometry determined specific surface area of 665m2/g and significant ratio of micropores in the sample with maximum wall’s diameter of 2.2nm. Fourier transform infrared spectroscopy (FTIR) confirmed the role of lignin and cellulose in the formation of the final LVC structure. Porous structure of the material was proved by using scanning electron microscopy. Preparation of LVC material drew attention as an easy and low-cost process for production of a highly efficient adsorbent which exhibited fast kinetics of ranitidine removal in the first minutes of contacting and large adsorption capacity (315.5mg/g) at equilibrium.

      PubDate: 2017-11-09T10:19:12Z
       
  • Mechanistic study of oxidation of d-arabinose by N-bromophthalimide in
           presence of micro-amount of chloro-complex of Ru(III) as a homogeneous
           catalyst

    • Abstract: Publication date: November 2017
      Source:Arabian Journal of Chemistry, Volume 10, Issue 7
      Author(s): Neerja Sachdev, Ajaya Kumar Singh, Alpa Shrivastava, Yokraj Katre, Aftab Aslam Parwaz Khan
      The kinetics and mechanism of Ru(III)-catalyzed oxidation of d-arabinose (d-Ara) by N-bromophthalimide (NBP) in a acidic medium were investigated using titrimetric method for the redox reaction in the temperature range of 303–323K. The reaction was first order with respect to [NBP] and [Ru(III)]. In both cases, the reaction followed identical kinetics with positive fractional order for [d-Ara] and [H+]. Negative effect with increase in [Cl−], [CH3COOH] and [acetonitrile] could also be observed. Erythronic acid and formic acid were identified as main oxidation products of the reaction. Reduced product of the oxidant i.e. phthalimide did not show significant effect on oxidation rate. Various activation parameters have also been evaluated. Finally a plausible mechanism has been proposed from the kinetic results, reaction stoichiometry and product analysis.

      PubDate: 2017-11-09T10:19:12Z
       
  • Influence of metal-support interaction on nitrate hydrogenation over Rh
           and Rh-Cu nanoparticles dispersed on Al2O3 and TiO2 supports

    • Abstract: Publication date: November 2017
      Source:Arabian Journal of Chemistry, Volume 10, Issue 7
      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 1.6nm and 1.3nm, 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: 2017-11-09T10:19:12Z
       
  • Preparation of silica doped titania nanoparticles with thermal stability
           and photocatalytic properties and their application for leather surface
           functionalization

    • Abstract: Publication date: November 2017
      Source:Arabian Journal of Chemistry, Volume 10, Issue 7
      Author(s): Carmen Gaidau, Aurora Petica, Madalina Ignat, Laura Madalina Popescu, Roxana Mioara Piticescu, Ioan Albert Tudor, Radu Robert Piticescu
      Doped nanoparticles based on titanium dioxide are of interest for their multifunctional properties and enlarged photocatalytic activity in visible domain. Silica doped titanium dioxide nanoparticles were prepared by hydrothermal method and their structural characteristics and photocatalytic activity were determined, in order to be used for leather coating as alternative to halogen based flame retardants and dry cleaning solvents. A range of concentrations from 2% to 20% silica doped titanium dioxide nanoparticles (% denotes the theoretical weight percent of Si) was synthesized and characterized by ICP-OES, FT-IR, UV-vis spectroscopy, XRD, HRTEM and DLS. Titanium dioxide network penetration was supported by Si-O-Ti and OH identification in FT-IR spectra mainly on surface of 10% and 20% silica doped titanium dioxide nanoparticles. The increase of Si-O-Ti bonds with Si dopant concentration acts as efficient barriers against sinterization and growth of TiO2 particles and explains the low particle size identified in HRTEM analyses as compared to undoped TiO2NPs. UV-vis diffuse reflectance spectra of doped titanium dioxide nanoparticles showed the shifting of absorption band to visible domain for 10% silica doped titanium dioxide nanoparticles. The crystallite sizes were calculated from XRD spectra, ranging between 16.2 and 18.1nm. HRTEM measurement of hydrothermally synthesized titanium dioxide nanoparticles showed anatase crystallites in the range of 8.8–27nm, while in the 20% silica doped titanium dioxide nanoparticle sample smaller crystallite with sizes between 2.7nm and 3.5nm was identified due to the constraints of the SiO2-based amorphous matrix. Nano sizes of 64nm and 72nm were found in water dispersions of 10% and 20% silica doped titanium dioxide nanoparticles and the Zeta potentials were of −53.6mV and −52.9mV, which indicate very good stabilities. The leather surface treated with composites of film forming polymers and 10% silica doped titanium dioxide nanoparticles displayed photocatalytic properties against methylene blue dye under UV and visible light exposure, attributed to reactive species generation with effect on surface hydrophilicity increase. The activation energies for decomposition of leathers treated with 10% and 20% silica doped titanium dioxide nanoparticles were 2.083×104 J/mol and 2.36×104 J/mol respectively, as compared to 6.576×103 J/mol for untreated leathers, showing increased thermal stability according to DSC measurements. The hydrothermal route for silica doped nanoparticle preparation proved advantages in enhancing photocatalytic properties in the visible domain and thermal resistance, with prospect for multifunctional applications.

      PubDate: 2017-11-09T10:19:12Z
       
  • Quenched polyelectrolytes with hydrophobicity independent from chemical
           charge fraction: A SANS and SAXS study

    • Abstract: Publication date: November 2017
      Source:Arabian Journal of Chemistry, Volume 10, Issue 7
      Author(s): Souha Ben Mahmoud, Wafa Essafi, Amira Abidelli, Michel Rawiso, François Boué
      We investigate by SANS and SAXS the structure of semidilute aqueous hydrophobic quenched polyelectrolyte solutions, in which we can vary independently the hydrophobicity and the chemical/electrostatic charge fraction (above the Manning condensation threshold 36%). Such a de-correlation is the original point of the work, reached using statistical tri-copolymers poly(acrylamide-co-styrene-co-2-acrylamido-2-methylpropane-sodium sulfonate), poly(AM x -co-ST y -co-AMPS z ). The hydrophobicity is brought by ST, the chemical electrostatic charge by AMPS and solubility without charge by AM. We consider that although these copolymers have chemical structure different from partially sulfonated polystyrene sulfonate, PS-co-SSNa, made of two monomers, one charged, one hydrophobic, they have however vicinal behavior. The variation of chemical charge, has no strong consequence on the structure properties which is in agreement with the fact that it is always larger than the Manning threshold. The dependence of q ∗ with AM content shows that AM reduces hydrophobicity. The similarity with PS-co-SSNa, for which pearl necklace-like conformations were directly measured by SANS (form factor using ZAC method), suggests that pearl necklace conformations are also adopted by these tri-copolymers and that this behavior could be so generalized to a much larger range of synthetic hydrophobic polyelectrolytes using simple copolymerization.
      Graphical abstract image

      PubDate: 2017-11-09T10:19:12Z
       
  • Corrosion and tribological performance of quasi-stoichiometric titanium
           containing carbo-nitride coatings

    • Abstract: Publication date: November 2017
      Source:Arabian Journal of Chemistry, Volume 10, Issue 7
      Author(s): Catalin Iulian Pruncu, Mariana Braic, Karl D. Dearn, Cosmin Farcau, Robert Watson, Lidia Ruxandra Constantin, Mihai Balaceanu, Viorel Braic, Alina Vladescu
      Zr, Nb and Si doped TiCN coatings, with (C+N)/(metal+Si) ratios of approximately 1, were deposited on stainless steel and Si wafer substrates using a cathodic arc technique in a mixture of N2 and CH4 gases. The coatings were comparatively analysed for elemental and phase composition, adhesion, anticorrosive properties and tribological performance at ambient and 250°C. Zr, Nb and Si alloying contents in the coatings were in the range 2.9–9.6at.%. All the coatings exhibited f.c.c. solid solution structures and had a 〈111〉 preferred orientation. In the adhesion tests conducted, critical loads ranged from 20 to 30N, indicative of a good adhesion to substrate materials. The Ti based coatings with Nb or Si alloying elements proved to be resistant to corrosive attack in 3.5% NaCl and of these coatings the TiNbCN was found to have the best corrosion resistance. TiCN exhibited the best tribological performance at 250°C, while at ambient temperatures it was TiNbCN. Abrasive and oxidative wear was found to be the main wear mechanism for all of the coatings. Of the tested coatings, TiNbCN coatings would be the most suitable candidate for severe service (high temperature, corrosive, etc.) applications.

      PubDate: 2017-11-09T10:19:12Z
       
  • A simple reversed phase high-performance liquid chromatography (HPLC)
           method for determination of in situ gelling curcumin-loaded liquid
           crystals in in vitro performance tests

    • Abstract: Publication date: November 2017
      Source:Arabian Journal of Chemistry, Volume 10, Issue 7
      Author(s): Bruno Fonseca-Santos, Maria Palmira Daflon Gremião, Marlus Chorilli
      A simple, rapid, and sensitive analytical procedure has been developed and validated for the in vitro measurement of curcumin in samples from mucosae retention studies. Curcumin was analyzed by HPLC using a C18 column with UV detection at 425nm. The mobile phase was acetonitrile and water (50:50 v/v) acidified with 2% acetic acid at a flow rate of 1.2mLmin−1. The curve range was linear for the receptor solution concentration range 0.5–75μgmL−1. The specificity showed no interference with the biological matrix and excipients of the acceptor media. Intra and inter-day accuracy, and precision values were lower than 5% and were not statically different (P <0.05). Recoveries ranged from 99.7% to 108%. The limits of detection and quantitation were 11.61 and 500ngmL−1, respectively. The method is adequate to assay curcumin from esophageal porcine samples, enabling the determination of penetration profiles for in situ gelling curcumin-loaded liquid crystals by in vitro studies, and fulfilled the requirements for reliability and feasibility for application to the quantitative analysis of curcumin in porcine esophageal mucosae.

      PubDate: 2017-11-09T10:19:12Z
       
  • Silica-based chelating resin bearing dual 8-Hydroxyquinoline moieties and
           its applications for solid phase extraction of trace metal analysis from
           seawater by ICP-MS

    • Abstract: Publication date: Available online 31 October 2017
      Source:Arabian Journal of Chemistry
      Author(s): Awadh O. AlSuhaimi, Salman M. AlRadaddi, Adeeb K. Al-Sheikh Ali, Amjad M. Shraim, Thamer S. AlRadaddi
      Solid phase extraction (SPE) using chelating resins has been established as a convenient technique for samples pretreatment prior to trace metal analysis from complex matrices. Oxine chelating agents (e.g., 8-Hydroxyquinoline (8-HQ)) are popular moitiees in the synthesis of chelating resins, due to their characteristic coordination chemistry. So far most of the reported silica -oxine chelators encompasses a single oxine molecule per spacer arm. In this work, two 8-HQ moieties have been covalently attached onto silica surface throughout a single linkage. The synthesized resin characterized with FTIR, elemental analysis and SEM. The main parameters affecting SPE procedures, such as pH, and sorption kinetics, investigated using batch experiments. The capacity exchange of the produced resin under optimized conditions was 0.219 and 0.161 mmolg-1 for Cu(II) and Mn(II) respectively. The resin packed into 10 ml standard cartridges and used with a typical SPE manifold for matrix removal prior to an ICP-MS analysis of transition metals (i.e., Cu, Cd, Ni, Pb, Zn, and Co) in seawater certified reference material samples and real samples from high saline seawater near the discharge zone of Yanbu desalination plant. The obtained results confirm the usefulness of the method.

      PubDate: 2017-11-01T09:47:01Z
       
  • Effect of deashing on physico-chemical properties of wheat and rice straw
           biochars and potential sorption of pyrazosulfuron-ethyl

    • Abstract: Publication date: Available online 31 October 2017
      Source:Arabian Journal of Chemistry
      Author(s): Suman Manna, Neera Singh, T.J. Purkayastha, Anne E. Berns
      Wheat (WBC) and rice straw biochars (RBC) prepared at 400 and 600°C and their deashed counterparts were characterized for their physico-chemical properties using CHN analysis, Benner–Emmer–Teller (BET), X-ray fluorescence (XRF), scanning electron microscopy (SEM), 13C-nuclear magnetic resonance (NMR), x-ray diffraction (XRD) and Fourier transform infrared (FT-IR) techniques. Pyrazosulfuron-ethyl sorption data on normal and deashed biochars could be well fitted to the Freundlich model. The characteristics of biochars and their adsorption capacities for pyrazosulfuron-ethyl were affected by the pyrolysis temperature and nature of feedstock. Rice biochars had higher sorption capacities than the wheat biochars. Deashing of biochars further enhanced their herbicide adsorption potential by a factor of 2-3. Sorption of herbicide on both normal and deashed biochars was concentration dependent (1/n < 1) and decreased with increase in the herbicide concentration in solution, indicating a saturation of sorption sites. The non-linearity of the isotherms increased with increasing pyrolysis temperature and deashing. Furthermore, adsorption of pyrazosulfuron-ethyl was affected by the pH, surface area and pore volume of biochars. Results of this study suggested that the mineral fraction of biochars significantly affected pyrazosulfuron-ethyl sorption.

      PubDate: 2017-11-01T09:47:01Z
       
  • Structural, morphological, optical and sensing properties of SnSe and
           SnSe2 thin films as a gas sensing material

    • Abstract: Publication date: Available online 28 October 2017
      Source:Arabian Journal of Chemistry
      Author(s): Kawther Assili, Oriol Gonzalez, Khaled Alouani, Xavier Vilanova
      In this work, orthorhombic tin selenide thin films were grown onto three different substrates using an organophosphorus precursor (Ph3PSe) via chemical vapor deposition. Structural, microstructural and morphological properties of the as-grown films were systematically investigated using XRD, ESEM and AFM respectively. Grain size, microstrain and dislocation were calculated and correlated with different factors. The effects of selenization temperature and substrate type on different film properties and gas sensing response of films deposited onto alumina substrates were investigated. XRD analysis reveals the appearance of a mixed phase as a function of temperature. Furthermore, substrate type plays a key role in the rate of appearance of each phase. EDAX analysis confirms the existence of the desired elements and detect the evaporation of selenium and the appearance of oxygen at higher temperatures. Atomic force microscopy (AFM) was used to investigate the surface topography of the grown thin films. Optical properties of the films grown onto glass and silicon substrates were studied. From the recorded optical data, a direct optical band gap in the range of 0.9-1.3 eV was obtained with an absorption coefficient α >104 cm-1 throughout large spectral regions. Optical studies were remarkably affected by the obtained phase as well as the selenization temperature. Gas sensing properties of the samples deposited onto alumina substrates were examined as a new sensing material for detection of methane gas at different concentrations. SnSe sensors show high sensitivity, are reversible and exhibit fast response and recovery times compared to SnSe2 sensors.
      Graphical abstract image

      PubDate: 2017-11-01T09:47:01Z
       
  • Application of HPLC to measure vanadium in environmental, biological and
           clinical matrices

    • Authors: Iman Boukhobza; Debbie C. Crans
      Abstract: Publication date: Available online 16 October 2017
      Source:Arabian Journal of Chemistry
      Author(s): Iman Boukhobza, Debbie C. Crans
      Vanadate and vanadium compounds exist in many environmental, biological and clinical matrices, and despite the need only limited progress has been made on the analysis of vanadium compounds. The vanadium coordination chemistry of different oxidation states is known, and the result of the characterization and speciation analysis depends on the subsequent chemistry and the methods of analysis. Many studies have used a range of methods for the characterization and determination of metal ions in a variety of materials. One successful technique is high performance liquid chromatography (HPLC) that has been used mainly for measuring total vanadium level and metal speciation. Some cases have been reported where complexes of different oxidation states of vanadium have been separated by HPLC. Specifically reversed phase (RP) HPLC has frequently been used for the measurement of vanadium. Other HPLC methods such as normal phase, anion-exchange, cation-exchange, size exclusion and other RP-HPLC modes such as, ion-pair and micellar have been used to separate selected vanadium compounds. We will present a review that summarizes and critically analyzes the reported methods for analysis of vanadium salts and vanadium compounds in different sample matrices. We will compare various HPLC methods and modes including sample preparation, chelating reagents, mobile phase and detection methods. The comparison will allow us to identify the best analytical HPLC method and mode for measuring vanadium levels and what information such methods provide with regard to speciation and quantitation of the vanadium compounds.

      PubDate: 2017-10-18T00:12:44Z
      DOI: 10.1016/j.arabjc.2017.10.003
       
  • Identification and inhibitory activities of ellagic acid- and
           kaempferol-derivatives from Mongolian oak cups against α-glucosidase,
           α-amylase and protein glycation linked to type II diabetes and its
           complications and their influence on HepG2 cells’ viability

    • Authors: Peipei Yin; Lingguang Yang Qiang Xue Miao Fan Yao Liwei
      Abstract: Publication date: Available online 10 October 2017
      Source:Arabian Journal of Chemistry
      Author(s): Peipei Yin, Lingguang Yang, Qiang Xue, Miao Yu, Fan Yao, Liwei Sun, Yujun Liu
      This study was to characterize phenolic composition of 50% ethanol crude extract (ECE) by UPLC-QTOF-MS/MS and to investigate anti-diabetic activities of the ECE and its four fractions from Mongolian oak cups. The results show that 24 phenolics were identified from the ECE, and ellagic acid (EA)- and kaempferol-derivatives were the main phenolic components in oak cups. Dominant constituents in each of the four fractions were subsequently characterized by HPLC fingerprints. Acid hydrolysis exhibited that oak cups contained both ellagitannins and gallotannins, and ellagitannins were the dominant hydrolysable tannins. Furthermore, ECE and its four fractions exhibited much more drastic inhibitory activities against α-glucosidase than α-amylase, and formation of advanced glycation end-products was inhibited differently by ECE and Frs I-IV. Overall, EA- and kaempferol-derivatives in oak cups were the main anti-diabetic contributors, and EA-derivatives exhibited superior inhibition against α-glucosidase and glycation while kaempferol-derivatives showed stronger α-amylase inhibitory activity. In addition, Frs I-IV affected cell viability differently and kaempferol-derivatives in Fr. IV resulted in its highest anticancer activity. Aforementioned results first indicated that oak cups, being underutilized plant byproducts, should be a novel dietary phytonutrient for diabetes management with inhibitory activities against α-glucosidase, α-amylase and formation of AGEs, as well as for cancer treatment.

      PubDate: 2017-10-10T23:09:49Z
       
  • A Review on multi-component green synthesis of N-containing heterocycles
           using mixed oxides as heterogeneous catalysts

    • Authors: Sandeep V.H.S.; Bhaskaruni Suresh Maddila Kranthi Kumar Gangu Sreekantha Jonnalagadda
      Abstract: Publication date: Available online 9 October 2017
      Source:Arabian Journal of Chemistry
      Author(s): Sandeep V.H.S. Bhaskaruni, Suresh Maddila, Kranthi Kumar Gangu, Sreekantha B. Jonnalagadda
      The use of mixed oxides is a well-appreciated approach in the fields of material science and synthesis, due to remarkable tunable surface properties such as acidic and basic characteristics, oxidation/reduction capabilities, and high agility of lattice oxygen, which makes them ideal choices as heterogeneous catalysts. The activity of the mixed oxides broadly relies on the nature of support and active material used and on the preparation method, calcination temperatures. Wide range of techniques for preparation of mixed oxide materials are adoptable, viz. sol-gel, co-precipitation, wet impregnation, microwave irradiation and hydrothermal methods. Use of mixed oxides as solid catalysts have gained popularity in many valued organic transformations, via alkylation, oxidation, condensation, dehydration, dehydrogenation, cycloaddition and isomerization. Application of mixed oxides in the area of green organic synthesis is a valuable strategy, which contributed significantly to the design of many novel heterocyclic scaffolds. The chemistry of N-heterocycle scaffolds, which generally possess five and six membered rings, is an interesting area for both synthetic and medicinal chemistry research constituting over 60% organics used in various arenas. The position and number of nitrogen atoms in the rings, distinguish them as pyrroles, pyrazoles, imidazoles, triazoles, pyridines and pyramidines classes. In this review, we focus on the scope, importance and versatile applications of mixed metal oxides and their synergetic effects as heterogeneous catalysts in the synthesis of variety of N-heterocyclic derivatives. The scientific aspects of the mixed oxides as catalytic active materials to design efficient synthetic protocols for the organic transformations is also discussed.
      Graphical abstract image

      PubDate: 2017-10-10T23:09:49Z
       
  • Biocidal mechanism of green synthesized thyme loaded silver nanoparticles
           (GTAgNPs) against immune evading tricky methicillin-resistant
           Staphylococcus aureus 090 at a homeostatic environment

    • Authors: H.M. Manukumar; Yashwanth Umesha Venkateswara Rao
      Abstract: Publication date: Available online 9 October 2017
      Source:Arabian Journal of Chemistry
      Author(s): H.M. Manukumar, B. Yashwanth, S. Umesha, J. Venkateswara Rao
      The tricky defense mechanism of methicillin-resistant Staphylococcus aureus (MRSA) 090 easily evades innate immune system to establish its journey in the body. Till today, the exact mechanism and toxicity of green silver nanoparticles to bacteria is an elusive question. To address this issue, synthesized a green thyme loaded silver nanoparticles (GTAgNPs), characterized and its toxicity to MRSA 090 was evaluated. The synthesized GTAgNPs showed controlled the particle size of 75 nm having anti-microbial property effective at 1 mg/mL confirmed by membrane destabilization validated by surface alterations through bioelectrochemistry, SEM., and AFM. The GTAgNPs showed negligible toxicity to PMBC and anti-cancer property against A549 and MCF-7 cell lines. The blood compatibility of GTAgNPs, delaying coagulation, and down-regulating the virulence genes MRSA 090 such as Coa and SpA. These studies conclude the GTAgNPs tested the first time against MRSA 090 and strongly presume that designing of the anti-staphylococcal drug from an active molecule of thyme plant being a natural source can gain more attention for medicine against MRSA infections in future.
      Graphical abstract image

      PubDate: 2017-10-10T23:09:49Z
       
  • Synthesis and biological evaluation of novel coumarin-chalcone derivatives
           containing urea moiety as potential anticancer agents

    • Authors: Belma Zengin; Kurt Nur Ozten Kandas Aydan Dag Fatih Sonmez
      Abstract: Publication date: Available online 7 October 2017
      Source:Arabian Journal of Chemistry
      Author(s): Belma Zengin Kurt, Nur Ozten Kandas, Aydan Dag, Fatih Sonmez, Mustafa Kucukislamoglu
      The increasing interest on new drug discovery is constantly up to date as drugs do not increase survival adequately against increasing cancer cases worldwide. Based on the reported anticancer activity of coumarin, chalcone and urea derivatives, the present investigation dealt with the design and synthesis of coumarin derivatives bearing diversely substituted chalcone-urea moieties 5a-k. Through a structure-based molecular hybridization approach, a series of novel coumarin-chalcone derivatives containing urea moiety was synthesized and screened for their in vitro antiproliferative activities against the cancer cell lines (H4IIE and HepG2). In addition, the synthesized compounds were tested on a cell line that was not cancerous (CHO) and the damage, it could give to normal cells was determined. Among the synthesized compounds, 5k exhibited better inhibition of H4IIE compared to Sorafenib. 5j also showed better inhibition against HepG2 than Sorafenib. In particular, 5k induced H4IIE apoptosis, arrested cell cycle at the S phase. Therefore, 5k and 5j may be potent antitumor agents, representing a promising lead for further optimization.

      PubDate: 2017-10-10T23:09:49Z
       
  • Composition and Biological Activity of the Algerian Plant Rosa canina L.
           by HPLC-UV-MS

    • Authors: Fetni Samira; Bertella Nabil Ouahab Ammar Jose Miguel Martinez Zapater
      Abstract: Publication date: Available online 6 October 2017
      Source:Arabian Journal of Chemistry
      Author(s): Fetni Samira, Bertella Nabil, Ouahab Ammar, Jose Miguel Martinez Zapater, Sonia De Pascual-Teresa Fernandez
      The present study was carried out in order to identify and characterize the compounds of Rosa canina fruits by HPLC-UV-MS. The total phenolic determiner by a new Fast Blue method (FBBB), which detects phenolic directly,reported an average total phenolic concentration of 1.7 folds greater than Folin-Ciocalteu(F-C), which indicates that an indirect detection method of total phenolic should be replaced in future studies by the FBBB method.TPC of the ethanolic extract was positively correlated with 1,1-diphenyl-2-picryl-hydrazyl (DPPH) free radical scavenging effect. The DPPH activity of R. canina extract which is higher than the IC50 of the ascorbic acid and Butylated Hydroxytoluene(BHT), but lower than the IC50 of quercetin and trolox. The determination of intracellular reactive oxygen species (ROS) proved the antioxidant effect of the extract on HepG2 and SH-SY5Y cells. A concentration of 1.63 μg/ml on HepG2 cells had an oxidizing effect instead of the antioxidant effect, which is due to the existence of a tert-butyl group in sesquiterpene identified by HPLC-UV-MS method. These results indicate that the fruits of R.canina can be used as a natural source of antioxidants against oxidative stress and some types of cancer.

      PubDate: 2017-10-10T23:09:49Z
       
  • Facile LaOF: Sm3+ based labeling agent and their applications in residue
           chemistry of latent fingerprint and cheiloscopy under UV-visible light

    • Authors: Suresh Nagabhushana; G.P. Darshan R.B. Basavaraj Kavyashree S.C. Sharma Arulmozhi
      Abstract: Publication date: Available online 6 October 2017
      Source:Arabian Journal of Chemistry
      Author(s): C. Suresh, H. Nagabhushana, G.P. Darshan, R.B. Basavaraj, D. Kavyashree, S.C. Sharma, A. Arulmozhi, B. Daruka Prasad, H.J. Amith Yadav
      Luminescent lanthanum oxyfluoride nano inorganic materials were considered to be prospective building blocks for multifunctional applications. This offers new potentials in surface-based science comprising of visualization of latent fingerprint (LFPs) and lips print on non-porous surfaces. Traditional visualization techniques possess high backward hindrance, low sensitivity, complicated setup and poor visibility. To overcome with these problems, LaOF: Sm3+ (5 mol%) nanopowder (NPsS) prepared via sonochemical route were explored. Photoluminescence (PL) emission spectra exhibit strong emission peaks at ∼ 566 nm, 607 nm, 653 nm and 708 nm attributed to 4G5/2 → 6H5/2, 4G5/2 → 4H7/2, 4G5/2 → 6H9/2 and 4G5/2 → 6H11/2 intra-4f orbital transitions of Sm3+ ions respectively. Estimated photometric properties confirm that the material emits warm orange red color. Therefore, the synthesized phosphor materials may quite useful for LFPs recovery, cheiloscopy and optoelectronics applications.
      Graphical abstract image

      PubDate: 2017-10-10T23:09:49Z
       
  • Influence of Neen Oil Pretreatment on the Dyeing and Antimicrobial
           Properties of Wool and Silk Fibers with Some Natural Dyes

    • Authors: E.M. El-Khatib; N.F. Ali; R.S.R. El-Mohamedy
      Abstract: Publication date: Available online 27 September 2017
      Source:Arabian Journal of Chemistry
      Author(s): E.M. El-Khatib, N.F. Ali, R.S.R. El-Mohamedy
      Wool and silk fibers pretreated with neem oil and dyed with chlorophyll, saffron red and yellow natural dyes using economic methods such as microwave heating and ultrasonic energy. The effect of neem oil concentrations on color strength (K/S) was measured. The results indicated that, wool and silk fibers pretreated with neem oil recorded higher color strength values than the untreated fibers. Fastness properties and the color yield of the dyes under investigation on wool and silk fibers were evaluated. The results indicated that, color fastness to rubbing, washing and perspiration of all dyes are excellent to good and are approximately the same in microwave and ultrasonic method. The antimicrobial activity against bacteria and fungi were tested, and the results indicated that the samples pretreated exhibited higher inhibition percent than the untreated fibers. The morphologies structure of the untreated and treated wool fibers were examined by scanning electron microscopy (SEM). The untreated samples have a rough surface. The pretreated samples of wool fibers were swelling compared to the untreated fibers .The diameter of the fibers increased and have smooth and even surfaces. The changes in the surface morphology due to the effect of active ingredients of treatment with neem oil. This behavior as swelling and increase in diameter of the fibers leads to high penetration of the dyes in the fibers.

      PubDate: 2017-10-01T20:35:21Z
      DOI: 10.1016/j.arabjc.2017.09.012
       
  • 3D-QSAR, docking, molecular dynamics simulation and free energy
           calculation studies of some pyrimidine derivatives as novel JAK3
           inhibitors

    • Authors: Anand Balupuri; Pavithra K. Balasubramanian; Seung Joo Cho
      Abstract: Publication date: Available online 24 September 2017
      Source:Arabian Journal of Chemistry
      Author(s): Anand Balupuri, Pavithra K. Balasubramanian, Seung Joo Cho
      Janus kinase 3 (JAK3) is a promising drug target for the treatment of inflammatory diseases, autoimmune disorders, organ transplant rejection and various cancers. In the present study, 3D-QSAR, docking, MD simulation and MM/PBSA studies were performed on a series of pyrimidine-based JAK3 inhibitors. A reliable COMSIA (q 2 = 0.717 and r 2 = 0.986) model was developed and validated using external validation test set, bootstrapping, progressive scrambling and r m 2 metrics analyses. Structural requirements identified through contour maps of the model were strategically utilized to computationally design 170 novel JAK3 inhibitors with improved potency. Docking studies were performed on the selected data set and newly designed compounds to show their binding mode and to identify important interacting residues inside the active site of JAK3. In addition, docking results of the selected designed compounds inside the active sites of JAK1, JAK2 and TYK2 indicated their JAK3 selectivity. MD simulation (100 ns) on the docked complex of compound 28 (one of highly active compounds of the data set) assisted in the further exploration of the binding interactions. Some crucial residues like Lys830 (glycine-rich loop), Val836, Ala853, Leu905 (hinge region), Cys909, Asn954, Leu956 and Ala966 were identified. Hydrogen bond interactions with hinge residue Leu905 were critical for the binding of JAK3 inhibitors. Additionally, MM/PBSA calculation provided the binding free energy of the compound 28. Newly designed molecules showed promising results in the preliminary in silico ADMET evaluations. Outcomes of the study can further be exploited to develop potent JAK3 inhibitors.
      Graphical abstract image

      PubDate: 2017-09-24T18:47:12Z
      DOI: 10.1016/j.arabjc.2017.09.009
       
  • Selective cyclodimerization of epichlorohydrin to dioxane derivatives over
           MOFs

    • Authors: Bibimaryam Mousavi; Somboon Chaemchuen; Suphot Phatanasri; Cheng Chen; Cheng Zeng; Rakesh Ganguly; Serge Zhuiykov; Francis Verpoort
      Abstract: Publication date: Available online 23 September 2017
      Source:Arabian Journal of Chemistry
      Author(s): Bibimaryam Mousavi, Somboon Chaemchuen, Suphot Phatanasri, Cheng Chen, Cheng Zeng, Rakesh Ganguly, Serge Zhuiykov, Francis Verpoort
      Glycerol can be converted to valuable products such as epichlorohydrin which is an important intermediate applied in various industries. For example, dioxane derivatives, which are important pharmaceuticals, can be obtained from epichlorohydrin. In the present study, ZIF-8, ZIF-67, MIL-100, and UiO-66 were applied for the direct cyclodimerization of epichlorohydrin. These MOFs were selected because they were already applied as active catalysts in ring opening of epoxides. Among them, ZIF-8 showed the highest activity and selectivity in the absence of any solvent or co-catalyst. Using ZIF-8 as a catalyst, the cyclodimer product (1,4-dioxane 2,5-bis-chloromethyl) was obtained in a yield of about 70% which was significantly superior to previous homo or heterogeneous catalysts for this reaction. Due to ZIF-8 structure and the proposed mechanism, the cyclodimerization reaction catalyzed either by the defects in the structure and/or on the surface. Furthermore, acidic-basic characteristics were also in play. The NH3 and CO2 temperature-programed desorption technique were utilized to identify the active sites and thereby reaction mechanism. Moreover, because of similar properties of ZIF-8 to zeolites, the activity of commercial ZSM-5 for the same reaction was also investigated in this work.
      Graphical abstract image

      PubDate: 2017-09-24T18:47:12Z
      DOI: 10.1016/j.arabjc.2017.09.011
       
  • Identification of Two Aromatic Isomers between 3- and 4- Hydroxy Benzoic
           Acid by Their Perturbation on the Potential Oscillations of a
           Belousov-Zhabotinsky System

    • Authors: Waqar Uddin; Gang Hu; Xuanxuan Sun; Hui Zhang; Yegui Wang; Lin Hu
      Abstract: Publication date: Available online 22 September 2017
      Source:Arabian Journal of Chemistry
      Author(s): Waqar Uddin, Gang Hu, Xuanxuan Sun, Hui Zhang, Yegui Wang, Lin Hu
      A novel method for identification of two aromatic isomers of mono hydroxy benzoic acid (HBA) was reported by using their different perturbation effects on the potential oscillations of a Belousov-Zhabotinsky (BZ) system. In such a system, a macrocyclic complex of Cu [CuL](ClO4)2 was used as catalyst in which ligand L is 5,7,7,12,14,14-hexamethyl-1,4,8,11-tetraazacyclotetradeca-4,11-diene. To the BZ system, 3-hydroxy benzoic acid (3-HBA) could temporarily quench and regenerate potential oscillations with damping characters after inhibition time (tin) while 4-hydroxy benzoic acid (4-HBA) could only change the oscillation amplitude (ΔA) to give damping oscillations with no inhibition time. Thus, these two isomers of HBA were identified. Reaction mechanisms of BZ have been proposed by FKN model. An explanation of perturbation mechanism is that, although 3-HBA reacted with BrO2 • while 4-HBA reacted with BrO3 -, they all produced 1,4-quinone.
      Graphical abstract image

      PubDate: 2017-09-24T18:47:12Z
      DOI: 10.1016/j.arabjc.2017.09.010
       
  • Method to Control the Optical properties: Band Gap Energy of Mixed Halide
           Organolead Perovskites

    • Authors: Blessing N. Ezealigo; Assumpta C Nwanya; Sabastine Ezugwu; Solomon Offiah; Daniel Obi; Rose U. Osuji; R. Bucher; Malik Maaza; Paul Ejikeme; Fabian I. Ezema
      Abstract: Publication date: Available online 21 September 2017
      Source:Arabian Journal of Chemistry
      Author(s): Blessing N. Ezealigo, Assumpta C Nwanya, Sabastine Ezugwu, Solomon Offiah, Daniel Obi, Rose U. Osuji, R. Bucher, Malik Maaza, Paul Ejikeme, Fabian I. Ezema
      In this work, we studied the effect of varying the volume of mixed halide perovskites on the structural, morphological and optical properties of deposited thin films. A two-step process of spin coating and dipping technique was employed so as to enhance deposition of the films. The samples were subjected to heat treatment after each deposition cycle in order to increase the crystalinity and grain size of the films. The band gap, refractive index, dielectric constant and optical conductivity of the mixed halide perovskites were calculated. The single term Wemple DiDomenico oscillator formulae were applied in determining the expression of the parameter n below the optical band gap in relation to the energy. A significant observation in this study was that the band gap of mixed halide perovskites was extremely lowered compared to the high band energy of its halide perovskite, which reveals the band gap alteration effect of mixed halide perovskites. The refractive index and dielectric constant of the halide and mixed halide perovkites showed results in the wavelength range of 300 – 600 nm, which is significant for photovoltaic materials.
      Graphical abstract image

      PubDate: 2017-09-24T18:47:12Z
      DOI: 10.1016/j.arabjc.2017.09.002
       
  • In vitro antitumor activity of water-soluble copper(I) complexes with
           diimine and monodentate phosphine ligands

    • Authors: Marina Porchia; Francesco Tisato; Mirella Zancato; Valentina Gandin; Cristina Marzano
      Abstract: Publication date: Available online 21 September 2017
      Source:Arabian Journal of Chemistry
      Author(s): Marina Porchia, Francesco Tisato, Mirella Zancato, Valentina Gandin, Cristina Marzano
      Copper(I) complexes including diimine ligands of the bicinchoninic acid (BCA) and bathocuproinedisulfonic acid (BCS) families and water-soluble phosphines have been synthetized, characterized and investigated for their in vitro anticancer potential against human tumor cell lines representing examples of lung, breast, pancreatic and colon cancers and melanoma. All copper complexes exhibited moderate to high cytotoxic activity and the ability to overcome cisplatin resistance. Remarkably, growth-inhibitory effects evaluated in human non-transformed cells revealed a preferential cytotoxicity versus neoplastic cells. The remarkable cytotoxic effect towards BxPC3 pancreatic cancer cells, notoriously poor sensitive to cisplatin, was not related to a DNA or proteasome damage.

      PubDate: 2017-09-24T18:47:12Z
      DOI: 10.1016/j.arabjc.2017.09.003
       
  • WO3 Decorated Carbon Nanotube Supported PtSn Nanoparticles with Enhanced
           Activity towards Electrochemical Oxidation of Ethylene Glycol in Direct
           Alcohol Fuel Cells

    • Authors: Krzysztof Miecznikowski
      Abstract: Publication date: Available online 14 September 2017
      Source:Arabian Journal of Chemistry
      Author(s): Krzysztof Miecznikowski
      This paper describes the concept of the utilization of metal oxide (WO3) modified multi-walled carbon nanotubes (MWCNT) for supporting and activating PtSn nanoparticles (PtSn/WO3-MWCNT and PtSn/MWCNT) for ethylene glycol oxidation. The resulting nanocomposite was developed and characterized using electrochemical and microscopic (TEM, SEM-EDS) techniques, as well as XRD analysis. The electrocatalytic currents measured under voltammetric and chronoamperometric conditions were greater than those found with the commercially available Vulcan-supported Pt3Sn nanoparticles, which were used as reference catalysts. In situ FTIR spectroscopy was used to detect the formation of oxidation intermediates or products during the ethylene glycol oxidation. Combining the transition metal oxide species with Pt-based nanoparticles can generate –OH groups at low potentials. These groups participate in the oxidation of passivating CO adsorbates on the Pt surface, and can also potentially break C-H bonds. Further, the effectiveness of synthesized catalyst has been assessed through testing both catalysts in the single fuel cell. A single fuel cell with a PtSn/WO3-MWCNT anode gave a better performance than one with a pristine PtSn/Vulcan anode, with a current density of around 79.8 mA cm-2 and an output power density of 20.5 mW cm-2.

      PubDate: 2017-09-18T17:13:36Z
      DOI: 10.1016/j.arabjc.2017.09.005
       
  • Enhanced photocatalytic activity of ZnO nanoparticles by surface
           modification with KF using thermal shock method

    • Authors: Tien Khoa Le; Thi Minh Tram Nguyen; Huu Thinh Pham Nguyen; Thi Kieu Loan Nguyen; Torben Lund; Huu Khanh Hung Nguyen; Thi Kieu Xuan Huynh
      Abstract: Publication date: Available online 14 September 2017
      Source:Arabian Journal of Chemistry
      Author(s): Tien Khoa Le, Thi Minh Tram Nguyen, Huu Thinh Pham Nguyen, Thi Kieu Loan Nguyen, Torben Lund, Huu Khanh Hung Nguyen, Thi Kieu Xuan Huynh
      ZnO nanoparticles were modified with KF using thermal shock method at various temperatures in order to improve the photocatalytic activity of ZnO under both UVA and visible light irradiation. The influences of KF-modification on the crystal structure, morphology, UV-visible absorption, specific surface area as well as surface structure of ZnO were respectively characterized by XRD, FE-SEM, UV-Visible diffuse reflectance, N2 adsorption and XPS spectroscopy. The photocatalytic activity was evaluated via the degradation of methylene blue under UVA irradiation. According to the results, the thermal shock process with KF did not modify the structure, the particle size and the optical properties of ZnO nanoparticles but successfully increase their UVA and visible light induced photocatalytic activity. This enhancement of activity may be attributed to the increase of surface hydroxyl groups and zinc vacancies of modified ZnO samples.

      PubDate: 2017-09-18T17:13:36Z
      DOI: 10.1016/j.arabjc.2017.09.006
       
  • Effect of temperature on the size of biosynthesized silver nanoparticle:
           deep insight into microscopic kinetics analysis

    • Authors: Hongyu Liu; Huan Zhang; Jie Wang; Junfu Wei
      Abstract: Publication date: Available online 14 September 2017
      Source:Arabian Journal of Chemistry
      Author(s): Hongyu Liu, Huan Zhang, Jie Wang, Junfu Wei
      Lacking of microscopic insight into quantitative nucleation and growth kinetics analysis, the effect of temperature on particle size in wet chemical synthesis of metal nanoparticles is still not fully understood. Firstly, we investigated the influence of temperature on the nucleation kinetics constant k1 and growth kinetics constant k2. Based on the microscopic quantitative kinetics analysis, the influence of temperature on size of nanoparticles was discussed and concluded in detail. In order to test and verify the conclusions, synthesis of AgNPs under sufficient and insufficient Ag+ precursors respectively was carried out. Temperature exhibits different effect on the size of nanoparticles under sufficient and insufficient Ag+ precursors due to its impressively different influence on the nucleation kinetics constant k1 and growth kinetics constant k2. It is the first time to discuss the effect of temperature on size of nanoparticles in detail based on the microscopic quantitative kinetics analysis. Our work provides useful deep insight into microscopic kinetics analysis of the effect of temperature on size distribution of AgNPs.

      PubDate: 2017-09-18T17:13:36Z
      DOI: 10.1016/j.arabjc.2017.09.004
       
  • Synthesis and special characterization through X-ray analysis of
           1,8-dioxooctahydroxanthenes

    • Authors: Milene Lopes da Silva; Róbson Ricardo Teixeira; Lucas de Azevedo Santos; Felipe Terra Martins; Teodorico Castro Ramalho
      Abstract: Publication date: Available online 9 September 2017
      Source:Arabian Journal of Chemistry
      Author(s): Milene Lopes da Silva, Róbson Ricardo Teixeira, Lucas de Azevedo Santos, Felipe Terra Martins, Teodorico Castro Ramalho
      Pyran moiety containing heterocyclic compounds have the capability for binding to either side to cyclohex-2-enone rings and to form xanthene derivatives (1,8-dioxooctahydroxanthenes also known as xanthenodiones). These xanthene derivatives display a wide range of biological activities and find applications in laser technologies and photodynamic therapy. This paper describes the preparation, X-ray structural analysis, and theoretical investigation of a series of 1,8-dioxooctahydroxanthenes. The compounds were synthesized via Knoevenagel condensation between different aldehydes and β-diketones. The reactions were performed free of solvents and the 1,8-dioxooctahydroxanthenes were obtained in good yields (70%−92%). All the compounds were fully characterized by NMR and IR spectroscopy as well as mass spectrometry. Among the synthesized compounds, seven had their crystal structures elucidated for the first time. In all the new crystal structures, the three fused rings did form an almost completely planar xanthenodione core, except for the side rings that adopt half-chair conformation with both carbons at the flaps oriented toward to the aromatic substituent, or with one of the two carbons pointing opposite to the substituent. Another conformational difference among the new compounds investigated by X-ray diffraction resides in the rotation around the bond axis connecting the xanthenodione core to its aromatic substituent. It was found that different bent levels resulted from weak intermolecular contact patterns. In addition, theoretical calculations for single molecule and dimmers have provided insights into the balance between intramolecular and intermolecular forces driving both conformational features.

      PubDate: 2017-09-12T16:04:37Z
      DOI: 10.1016/j.arabjc.2017.09.001
       
  • Inside Front Cover - Editorial Board

    • Abstract: Publication date: September 2017
      Source:Arabian Journal of Chemistry, Volume 10, Issue 6


      PubDate: 2017-09-06T14:51:18Z
       
 
 
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