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  Subjects -> CHEMISTRY (Total: 852 journals)
    - ANALYTICAL CHEMISTRY (52 journals)
    - CHEMISTRY (598 journals)
    - CRYSTALLOGRAPHY (21 journals)
    - ELECTROCHEMISTRY (25 journals)
    - INORGANIC CHEMISTRY (41 journals)
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    - PHYSICAL CHEMISTRY (69 journals)

CHEMISTRY (598 journals)                  1 2 3 | Last

Showing 1 - 200 of 735 Journals sorted alphabetically
2D Materials     Hybrid Journal   (Followers: 10)
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: 38)
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: 251)
ACS Photonics     Full-text available via subscription   (Followers: 12)
ACS Synthetic Biology     Full-text available via subscription   (Followers: 23)
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 Chimica Slovenica     Open Access  
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: 57)
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: 18)
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)
Al-Kimia : Jurnal Penelitian Sains Kimia     Open Access  
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: 66)
American Journal of Biochemistry and Molecular Biology     Open Access   (Followers: 15)
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: 39)
Angewandte Chemie     Hybrid Journal   (Followers: 177)
Angewandte Chemie International Edition     Hybrid Journal   (Followers: 229)
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: 16)
Anti-Infective Agents     Hybrid Journal   (Followers: 3)
Antiviral Chemistry and Chemotherapy     Hybrid Journal   (Followers: 1)
Applied Organometallic Chemistry     Hybrid Journal   (Followers: 7)
Applied Spectroscopy     Full-text available via subscription   (Followers: 22)
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: 325)
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: 122)
Bioorganic & Medicinal Chemistry Letters     Hybrid Journal   (Followers: 84)
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: 5)
Carbohydrate Research     Hybrid Journal   (Followers: 26)
Carbon     Hybrid Journal   (Followers: 68)
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: 5)
ChemBioEng Reviews     Full-text available via subscription   (Followers: 1)
ChemCatChem     Hybrid Journal   (Followers: 8)
Chemical and Engineering News     Free   (Followers: 15)
Chemical Bulletin of Kazakh National University     Open Access  
Chemical Communications     Full-text available via subscription   (Followers: 70)
Chemical Engineering Research and Design     Hybrid Journal   (Followers: 25)
Chemical Research in Chinese Universities     Hybrid Journal   (Followers: 3)
Chemical Research in Toxicology     Full-text available via subscription   (Followers: 21)
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: 56)
Chemie-Ingenieur-Technik (Cit)     Hybrid Journal   (Followers: 24)
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: 42)
Chemistry of Materials     Full-text available via subscription   (Followers: 246)
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: 14)
Chemosensors     Open Access  
ChemPhysChem     Hybrid Journal   (Followers: 10)
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: 6)
Combinatorial Chemistry & High Throughput Screening     Hybrid Journal   (Followers: 4)
Combustion Science and Technology     Hybrid Journal   (Followers: 19)
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: 11)
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)
Corrosion Series     Full-text available via subscription   (Followers: 6)
Critical Reviews in Biochemistry and Molecular Biology     Hybrid Journal   (Followers: 5)
Croatica Chemica Acta     Open Access  
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: 18)
Current Research in Chemistry     Open Access   (Followers: 8)
Current Science     Open Access   (Followers: 64)
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  

        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  [3118 journals]
  • Triazole containing magnetic core-silica shell nanoparticles for Pb2+,
           Cu2+ and Zn2+ removal

    • Authors: Zakaria Mokadem; Sofiane Mekki; Salima Saïdi-Besbes; Geraldine Agusti; Abdelhamid Elaissari; Aicha Derdour
      Pages: 1039 - 1051
      Abstract: Publication date: December 2017
      Source:Arabian Journal of Chemistry, Volume 10, Issue 8
      Author(s): Zakaria Mokadem, Sofiane Mekki, Salima Saïdi-Besbes, Geraldine Agusti, Abdelhamid Elaissari, Aicha Derdour
      The main goal of this work was to investigate the ability of 1,2,3-triazole functionalized magnetic nanoparticles (MNP-Trz) and silica coated MNP homologous (MNPS-Trz) for removal of heavy metal cations. Three steps for efficient synthetic pathway were used for chemical modification of magnetic core based on copper catalyzed 1,3-dipolar cycloaddition. The magnetic nanoparticles were characterized by using various techniques such as X-ray diffraction (WAXD), infrared spectroscopy (FTIR), thermogravimetry analysis (TGA), zeta potential analysis, transmission electron microscopy (TEM) and scanning electron microscopy (SEM). The adsorption of prepared nanosized magnetic nanoparticles toward Cu2+, Pb2+ and Zn2+ ions was examined as a function of various physical-chemistry conditions. Adsorption isotherms and kinetics were studied and discussed by considering various theoretical models. The equilibrium kinetics was found to be second order model irrespective of investigated system. The best corroborating model with the obtained experimental results was found to be Langmuir one with maximum adsorption capacities at pH 5.5 and 25°C for Cu2+, Pb2+ and Zn2+ ions found to be 87.87, 167.78 and 51.20mgg−1, respectively. Similar high maximum uptake tendency was also obtained for magnetic core-silica shell nanoparticles. It is interesting to notice that the regeneration of the used MNP-Trz was successfully achieved by using 0.1M HNO3 since 88% desorption efficiency was reached.
      Graphical abstract image

      PubDate: 2017-12-26T01:49:49Z
      DOI: 10.1016/j.arabjc.2016.12.008
       
  • Comparison between polyvinyl alcohol (PVA) nanofiber and polyvinyl alcohol
           (PVA) nanofiber/hydroxyapatite (HA) for removal of Zn2+ ions from
           wastewater

    • Authors: A.M. Abd El-aziz; Azza El-Maghraby; Nahla A. Taha
      Pages: 1052 - 1060
      Abstract: Publication date: December 2017
      Source:Arabian Journal of Chemistry, Volume 10, Issue 8
      Author(s): A.M. Abd El-aziz, Azza El-Maghraby, Nahla A. Taha
      Nanocomposites in the form of continuous and aligned polyvinyl alcohol (PVA) nanofibers have been obtained by the electrospinning process. These fibers were used as matrix for hydroxyapatite (HA). PVA and PVA/HA nanofibers were fabricated and crosslinked with glutaraldehyde (GA). The hybrid of polymer with ceramics (HA) shows good properties of large surface area and good porosity that were demonstrated by different characterization techniques such as FTIR, SEM, XRD and EDX which illustrate the ratio of HA. The prepared nanofibrous membranes are used for removal of Zn2+ from simulated water. The potential of these synthesized sorbents to remove Zn2 + ions from aqueous solutions was investigated in batch experiments, where several parameters such as the sorbate/sorbent’s contact time, initial Zn2+ ions concentration and sorbent dosage were investigated. The equilibrium concentration of Zn2 + ions was identified by the atomic absorption spectrophotometry and the adsorption process was studied by the isotherm models such as Langmuir, Freundlich and Temkin. The Zn2 + adsorption process for PVA and PVA/HA nanofibrous membranes was fitted to Langmuir and Freundlich isotherm models respectively.

      PubDate: 2017-12-26T01:49:49Z
      DOI: 10.1016/j.arabjc.2016.09.025
       
  • Synthesis, characterization and metal coordination of a potential
           β-lactamase inhibitor:
           5-Methyl-2-phenoxymethyl-3-H-imidazole-4-carboxylic acid (PIMA)

    • Authors: Chiara Romagnoli; Fabio Prati; Rois Benassi; Giulia Orteca; Monica Saladini; Erika Ferrari
      Pages: 1061 - 1069
      Abstract: Publication date: December 2017
      Source:Arabian Journal of Chemistry, Volume 10, Issue 8
      Author(s): Chiara Romagnoli, Fabio Prati, Rois Benassi, Giulia Orteca, Monica Saladini, Erika Ferrari
      Among relevant metal ions in biological systems, zinc and iron play a key role as active partners of the catalytic machinery. In particular, the inhibition of metal enzymes that are involved in physiological and pathological processes has been deeply investigated for the rational design of selective and efficient drugs based on chelators. Since imidazole histidine residue is one of the most versatile sites in proteins, especially in enzymes acting in the presence of metal ions as cofactors, in this work the synthesis and characterization of a new imidazole derivative, namely 5-methyl-2-phenoxymethyl-3-H-imidazole-4-carboxylic acid (PIMA) is reported. PIMA was designed as metallo-β-lactamase inhibitor thanks to its similarity with penicillin V, a β-lactam antibiotic inactivated by metallo-β-lactamase, for which there are no commercially available inhibitors. The evaluation of PIMA coordinating ability toward iron, zinc, and gallium, these latter selected as a non-paramagnetic probe for iron, is performed by theoretical DFT calculations and in solution by experimental techniques, i.e. potentiometry, UV–vis and NMR spectroscopy. PIMA exhibits an efficient metal chelating ability; the prevailing species in physiological condition are ML3 for Fe3+ and Ga3+ and ML2 for Zn2+, in which chelation is due to deprotonated carboxylic oxygen and imidazole nitrogen in the N,O donor set. The demonstrated ability of PIMA to chelate zinc ion, combined with its structure similarity with penicillin V, supports further exploration of this imidazole-4-carboxylate as metallo-β-lactamase inhibitor.

      PubDate: 2017-12-26T01:49:49Z
      DOI: 10.1016/j.arabjc.2015.11.007
       
  • [CTA]Fe/MCM-41: An efficient and reusable catalyst for green synthesis of
           xanthene derivatives

    • Authors: Mahtab Pirouzmand; Adel Mahmoudi Gharehbaba; Zarrin Ghasemi; Sajjad Azizi Khaaje
      Pages: 1070 - 1076
      Abstract: Publication date: December 2017
      Source:Arabian Journal of Chemistry, Volume 10, Issue 8
      Author(s): Mahtab Pirouzmand, Adel Mahmoudi Gharehbaba, Zarrin Ghasemi, Sajjad Azizi Khaaje
      Iron was incorporated into MCM-41 via direct synthesis and wet impregnation methods. Removal of the surfactant occluded in Fe/MCM-41 pores has been performed by using two procedures: solvent extraction and calcination. For comparison, a series of template-containing mesoporous Fe/MCM-41 were also synthesized without surfactant removal. The catalysts were examined in three component reaction to afford benzoxanthene derivative. A high yield of 91% was achieved over template-containing Fe/MCM-41 catalyst. This high activity is due to both lewis acid sites and ionic template. This catalyst could be easily recovered by filtration and reused without loss of its catalytic activity because the organic template does not leach during the reaction. It is also very efficient for the synthesis of a hydroxanthene derivative.

      PubDate: 2017-12-26T01:49:49Z
      DOI: 10.1016/j.arabjc.2016.06.017
       
  • Surfactant and natural sunlight enhanced Photogalvanic effect of Sudan I
           dye

    • Authors: Pooran Koli
      Pages: 1077 - 1083
      Abstract: Publication date: December 2017
      Source:Arabian Journal of Chemistry, Volume 10, Issue 8
      Author(s): Pooran Koli
      Photogalvanic cells (PG) have been extensively studied for solar power and storage at low intensity artificial sunlight. But, PG can be practically significant and applicable in daily life only when they are validated at natural sunlight intensity. Therefore, the present study of photogalvanics of Sudan I-Fructose with efficiency enhancer chemical such as Sodium Lauryl Sulfate (SLS) surfactant in alkaline medium has been used to observe their workable feasibility in natural sunlight with investigation for optimal fabrication parameters. The cell has been found workable in natural sunlight with greatly enhanced optimum cell performance compared to that for reported similar cells. The observed optimum cell performance in terms of maximum power, short-circuit current, open-circuit potential, conversion efficiency and storage capacity (as half change time) is of the order of 1081.1μW, 4200μA, 1048mV, 13.5%, and 31min, respectively.

      PubDate: 2017-12-26T01:49:49Z
      DOI: 10.1016/j.arabjc.2014.11.061
       
  • Developing efficient protocols for synthesis, antiosteoarthritic,
           antiinflammatory assessments and docking studies of nitrogen-containing
           bisphosphonate derivatives

    • Authors: Wafaa M. Abdou; Neven A. Ganoub; Mohamed A.H. Ismail; Eman Sabry; Reham F. Barghash; Athina Geronikaki
      Pages: 1084 - 1097
      Abstract: Publication date: December 2017
      Source:Arabian Journal of Chemistry, Volume 10, Issue 8
      Author(s): Wafaa M. Abdou, Neven A. Ganoub, Mohamed A.H. Ismail, Eman Sabry, Reham F. Barghash, Athina Geronikaki
      We report herein, two synthetic approaches to three types of nitrogen-containing bisphosphonates (N-BPs) in moderate to high yields (58–88%). Ester cleavage of selected bisphosphonates was undertaken to obtain their N-BP-acid analogs. Based on the reported bisphosphonate properties and the prospective biological prediction using computer-assisted molecular modeling (CAMM), new compounds were evaluated in a mouse model of antigen-induced arthritis (AIA) and the delayed-type hypersensitivity granuloma reaction (DTH-GRA) for chronic inflammation. Pharmacological results showed that N-BP-acids are more favorable for antiarthritis activity than N-BP-esters. On the other hand, the majority of N-BPs revealed good antiinflammatory potency compared to their acid analogs. The results also showed that the presence of a free thiol group in a molecule enhances the anti-inflammatory activity. Furthermore, bioscreening results were in good agreement with the prediction investigation. A hypothesis of molecular modeling study, including fitting of the synthesized compounds into 3D-pharmacophore using Discovery Studio 2.5 software and their docking into the human farnesyl pyrophosphate synthase (hFPPS, PDB code: 2F8C protein) showed good results consistent with the observed pharmacological properties.
      Graphical abstract image

      PubDate: 2017-12-26T01:49:49Z
      DOI: 10.1016/j.arabjc.2016.02.019
       
  • Synthesis, characterization and biological evaluation of some novel
           nitrogen and sulphur containing organometallic heterocycles

    • Authors: Humaira Parveen; Raedah Aiyed Suliman Alatawi; Nadia Hussein El Sayed; Sadaf Hasan; Sayeed Mukhtar; Asad U. Khan
      Pages: 1098 - 1106
      Abstract: Publication date: December 2017
      Source:Arabian Journal of Chemistry, Volume 10, Issue 8
      Author(s): Humaira Parveen, Raedah Aiyed Suliman Alatawi, Nadia Hussein El Sayed, Sadaf Hasan, Sayeed Mukhtar, Asad U. Khan
      A series of some novel sulphur and nitrogen containing ferrocenyl linked heterocyclic compounds were synthesized by multistep reactions and evaluated for in vitro antimicrobial activity against 15 ATCC strains out of which 8 were bacterial (Pseudomonas aeruginosa, Streptococcus bovis, Enterococcus faecalis, Klebsiella pneumoniae, Escherichia coli, Enterobacter cloacae, Methicillin-resistant Staphylococcus aureus and Streptococcus mutans) and 7 were fungal (Candida albicans, Candida dubliniensis, Candida glabrata, Candida parapsilosis, Candida tropicalis, Candida kefyr and Candida krusei) strains. The results clearly depict that the compounds (1–12) gave an average antimicrobial activity against the tested strains with an exception of compound 12 which stood out in terms of its activity against the tested organisms. All these compounds gave a range of MIC value between 32–64μg/ml against S. bovis, E. coli and C. tropicalis except compound 12 which gave a MIC of 16μg/ml against each of them. The MIC values of all these compounds against biofilm forming P. aeruginosa and S. mutans were 64–256μg/ml and 64–128μg/ml respectively which is apparently high, concluding that these compounds hold immense potential to be employed as a two in one formulation of antibacterial as well as antifungal agents.

      PubDate: 2017-12-26T01:49:49Z
      DOI: 10.1016/j.arabjc.2015.05.002
       
  • Biogenic synthesis, characterization of antibacterial silver nanoparticles
           and its cell cytotoxicity

    • Authors: V. Gopinath; S. Priyadarshini; Mun Fai Loke; J. Arunkumar; Enrico Marsili; D. MubarakAli; P. Velusamy; Jamuna Vadivelu
      Pages: 1107 - 1117
      Abstract: Publication date: December 2017
      Source:Arabian Journal of Chemistry, Volume 10, Issue 8
      Author(s): V. Gopinath, S. Priyadarshini, Mun Fai Loke, J. Arunkumar, Enrico Marsili, D. MubarakAli, P. Velusamy, Jamuna Vadivelu
      The advanced research and development of silver nanoparticles (AgNPs) is vast due to their incredible applications today. In this work, AgNPs were synthesized using soil derived Pseudomonas putida MVP2. The AgNPs formation on the P. putida cell membrane and its cell free supernatant was studied. The synthesized AgNPs were characterized by UV–visible spectroscopy, scanning transmission electron microscopy (STEM), X-ray diffraction (XRD), energy dispersive X-ray (EDAX) and Fourier transform infrared (FTIR) spectrum analysis. The mode of action of AgNPs on the bacteria was studied against clinically isolated bacterial pathogens, Staphylococcus aureus, Escherichia coli, Bacillus cereus, Pseudomonas aeruginosa and Helicobacter pylori by membrane integrity, and protein leakage using confocal and electron microscopy. Interestingly, AgNPs had no cytotoxicity under 25μg/mL and it was toxic at above 50μg/mL on human epidermoid larynx carcinoma (HEp-2) cells. This study evidenced that biogenic nanoparticles could affect the bacterial replication, protein leakage and eventually cell death. This might be used for active antimicrobial agents for the chronic infections.

      PubDate: 2017-12-26T01:49:49Z
      DOI: 10.1016/j.arabjc.2015.11.011
       
  • Optical and morphological studies of transition metal doped ZnO nanorods
           and their applications in hybrid bulk heterojunction solar cells

    • Authors: Syed Mujtaba Shah; Hina Naz; Rai Nauman Ali; Fakhr-e- Alam; Abid Ali; Muhammad Farooq; Afzal Shah; Amin Badshah; Muhammad Siddiq; Amir Waseem
      Pages: 1118 - 1124
      Abstract: Publication date: December 2017
      Source:Arabian Journal of Chemistry, Volume 10, Issue 8
      Author(s): Syed Mujtaba Shah, Hina Naz, Rai Nauman Ali, Fakhr-e- Alam, Abid Ali, Muhammad Farooq, Afzal Shah, Amin Badshah, Muhammad Siddiq, Amir Waseem
      One of the challenges in improving the efficiency of hybrid solar cells is to remove crystal defects from the semiconducting nanoparticles. Here we report the synthesis, characterization and applications of transition metal doped ZnO nanorods in hybrid bulk heterojunction solar cells. Mn x Zn1 − x O and Ni x Zn1 − x O with dopant concentrations ranging from x =0.01–0.10 were successfully synthesized by a novel facile solution-processed wet chemical method, which gave better yield at low cost and temperature. The morphological and optical properties of the material were investigated by Transmission electron microscopy (TEM), UV–Visible and Fluorescence spectroscopies. TEM measurements confirmed the reduction in size of nanorods upon doping. UV–Visible spectra of doped nanorods showed blue shift with respect to the reference undoped ZnO. The defect emissions were completely disappeared from the fluorescence spectra upon doping at high concentrations. These doped nanorods in combination with P3HT were employed in the hybrid solar cells which gave better current densities than their corresponding undoped counterparts.

      PubDate: 2017-12-26T01:49:49Z
      DOI: 10.1016/j.arabjc.2014.10.001
       
  • Basketing nanopalladium into calix[4]pyrrole as an efficient catalyst for
           Mizoroki-Heck reaction

    • Authors: Anita Kongor; Manthan Panchal; Viren Mehta; Keyur Bhatt; Dehin Bhagat; Devayani Tipre; Vinod K. Jain
      Pages: 1125 - 1135
      Abstract: Publication date: December 2017
      Source:Arabian Journal of Chemistry, Volume 10, Issue 8
      Author(s): Anita Kongor, Manthan Panchal, Viren Mehta, Keyur Bhatt, Dehin Bhagat, Devayani Tipre, Vinod K. Jain
      An approach to synthesize calix[4]pyrrole protected palladium nanoparticles (PdNPs) employed for catalytic Mizoroki-Heck C-C coupling reaction is reported. The nanoparticles are synthesized in water using novel calix[4]pyrrole tetrahydrazide (CPTH) as a reducing as well as stabilizing agent which is a proficient “one-pot” synthesis discouraging the need of an external stabilizer. CPTH-PdNPs have been characterized and studied by UV–Vis spectroscopy, Fourier transform infrared, transmission electron microscopy, energy‐dispersive X‐ray and powder X‐ray diffraction. The synthesized palladium nanoparticles with a size range of 5–9nm show an efficient catalytic activity for Heck cross-coupling reactions giving good yields within short reaction time in comparison with conventional palladium catalyst. Also, a good degree of recyclability is shown by the nanocatalyst with five consecutive catalytic cycles. CPTH-PdNPs also exhibit a potential antimicrobial activity against gram-negative bacteria which shows the biological applicability of the synthesized CPTH-PdNPs.
      Graphical abstract image

      PubDate: 2017-12-26T01:49:49Z
      DOI: 10.1016/j.arabjc.2016.06.019
       
  • Study of polyacrylamide-surfactant system on the water–oil interface
           properties and rheological properties for EOR

    • Authors: S.Z. Mahdavi; J. Aalaie; T. Miri; S.M.R. Razavi; M.R. Rahmani
      Pages: 1136 - 1146
      Abstract: Publication date: December 2017
      Source:Arabian Journal of Chemistry, Volume 10, Issue 8
      Author(s): S.Z. Mahdavi, J. Aalaie, T. Miri, S.M.R. Razavi, M.R. Rahmani
      Nowadays, due to the remarkable oil reduction in oil fields, enhanced oil recovery (EOR) techniques have been considered by a large number of scientists and company. Situ oil extraction is normally done by these techniques with high efficiency. In this particular study, five different surface active agents (surfactant), two kinds of oil with various API, two kinds of sulfonated polyacrylamide, two different electrolyte solutions with various TDS and two distinctive alcohols were tested and evaluated. An optimal formulation in terms of the properties and quantity of materials has to be used in order to enhance oil recovery, achieved by investigation of surface tension and the phase behavior of mentioned substances. Rheological behavior of polymer flooding and surfactant was studied. Employing this formulation, the maximum micro emulsion of oil in water occurred. Due to the synergy between surfactant and alcohol (as a co-surfactant), relatively lower amounts of surfactants were used which led to the dip in the cost of operation, and ultimately the efficiency of operation improved.

      PubDate: 2017-12-26T01:49:49Z
      DOI: 10.1016/j.arabjc.2016.05.006
       
  • Effect of water-based sol gel method on structural, thermal and
           conductivity properties of LiNO3–Al2O3 composite solid electrolytes

    • Authors: M. Sulaiman; A.A. Rahman; N.S. Mohamed
      Pages: 1147 - 1152
      Abstract: Publication date: December 2017
      Source:Arabian Journal of Chemistry, Volume 10, Issue 8
      Author(s): M. Sulaiman, A.A. Rahman, N.S. Mohamed
      Composite solid electrolytes in the system (1−x)LiNO3–xAl2O3, with x =0.0–0.5 were prepared by sol gel method. No organic solvents but water was used as medium for the sol preparation. The obtained materials were characterized by X-ray diffraction, differential scanning calorimetry, scanning electron microscopy, Fourier transform infrared spectroscopy and impedance spectroscopy. Structural analysis evidenced amorphous phase of LiNO3 in all composite samples. Traces of crystalline LiAl5O8 and LiAlO2 were also present in the composite samples with x =0.3–0.5, as indicated by the X-ray diffractograms. The thermal analysis showed that the samples were in a stable phase between ∼48°C – ∼100°C and ∼120°C – ∼220°C. The conductivity values of the composites were in the range of 10−3 Scm−1 at room temperature to 180°C. Our study demonstrates that water is suitable for the preparation of the composite solid electrolytes.

      PubDate: 2017-12-26T01:49:49Z
      DOI: 10.1016/j.arabjc.2015.04.031
       
  • Poly (acrylonitrile-co-methyl methacrylate) nanoparticles: I. Preparation
           and characterization

    • Authors: M.S. Mohy Eldin; M.R. Elaassar; A.A. Elzatahry; M.M.B. Al-Sabah
      Pages: 1153 - 1166
      Abstract: Publication date: December 2017
      Source:Arabian Journal of Chemistry, Volume 10, Issue 8
      Author(s): M.S. Mohy Eldin, M.R. Elaassar, A.A. Elzatahry, M.M.B. Al-Sabah
      This work concerns the preparation and characterization of poly (acrylonitrile-co-methyl methacrylate) Copolymer, P(AN-co-MMA), nano-particles using precipitation polymerization technique. Potassium per-sulfate redox initiation system was used to perform polymerization process in an alcoholic aqueous system. The impact of different polymerization conditions such as comonomer concentration and ratio, polymerization time, polymerization temperatures, initiator concentration and co-solvent composition on the polymerization yield and particle size was studied. Maximum polymerization yield, 70%, was obtained with MMA:AN (90%:10%) comonomer composition. Particle sizes ranging from 16nm to 1483nm were obtained and controlled by variation of polymerization conditions. The co-polymerization process was approved by FT-IR and TGA analysis. The copolymer composition was investigated by nitrogen content analysis. Copolymers with a progressive percentage of PAN show thermal stabilities close to PAN Homopolymer. SEM photographs prove spherical structure of the produced copolymers. The investigated system shows promising future in the preparation of nanoparticles from comonomers without using emulsifiers or dispersive agents.

      PubDate: 2017-12-26T01:49:49Z
      DOI: 10.1016/j.arabjc.2014.10.037
       
  • Structural, morphological, optical, and photoluminescence properties of
           nanocrystalline PbS thin films grown by chemical bath deposition

    • Authors: S. Rajathi; K. Kirubavathi; K. Selvaraju
      Pages: 1167 - 1174
      Abstract: Publication date: December 2017
      Source:Arabian Journal of Chemistry, Volume 10, Issue 8
      Author(s): S. Rajathi, K. Kirubavathi, K. Selvaraju
      The transparent and nanocrystalline lead sulfide (PbS) thin films were prepared by the chemical bath deposition (CBD) technique onto glass substrates deposited at 80°C using aqueous solution of lead acetate and thiourea. The X-ray diffraction pattern proves the crystallinity of deposited films that crystallize in the orthorhombic structure and preferred orientation. The energy band-gap and refractive index were estimated using UV–visible absorption spectra. The variation in band-gap with grain size showed blue-shift typical of electron quantum confinement. The effect of crystal ordering on refractive index was also evident by the linear increase of the refractive index with grain size. The PbS thin films were characterized by XRD, optical and SEM analysis.

      PubDate: 2017-12-26T01:49:49Z
      DOI: 10.1016/j.arabjc.2014.11.057
       
  • Acid–base properties of pillared interlayered clays with single and
           mixed Zr–Al oxide pillars prepared from Tunisian-interstratified
           illite–smectite

    • Authors: Saida Mnasri; Noureddine Hamdi; Najoua Frini-Srasra; Ezzeddine Srasra
      Pages: 1175 - 1183
      Abstract: Publication date: December 2017
      Source:Arabian Journal of Chemistry, Volume 10, Issue 8
      Author(s): Saida Mnasri, Noureddine Hamdi, Najoua Frini-Srasra, Ezzeddine Srasra
      Interstratified illite–smectite clay samples from Tunisia have been used in order to prepare Al, Zr and Zr–Al-pillared clays. Several Al/metal, OH/metal ratios were used in order to investigate the effect on the chemical and physical properties, specifically the point of zero charge (PZC) of the synthesized pillared clays. The structure of the pillared materials is studied by XRD and cationic exchange capacity. The textural property is investigated by the nitrogen adsorption/desorption method. The acid–base chemistry “surface acidity” of these products was analysed by using mass and potentiometric titration in order to determine the PZC and the equilibrium constants (pK a) of each sample. The resulting materials exhibited basal spacings in the range of 17.4–20.5Å, with high surface areas (134–199m2 g−1). Titration curves obtained by acid–base potentiometric titration for the starting material showed an indistinct cross-over point at about pH=7.3, whereas in the case of pillared samples, points were observed at the acidic region between 4 and 6. In addition, the calculated pK as values of pillared clays show a shifting to the acidic values compared to the untreated sample.

      PubDate: 2017-12-26T01:49:49Z
      DOI: 10.1016/j.arabjc.2014.07.004
       
  • Phenylation of aminoindazole derivatives

    • Authors: Abdellah Miloudi; Douniazad El Abed; Gerard Boyer
      Pages: 1184 - 1187
      Abstract: Publication date: December 2017
      Source:Arabian Journal of Chemistry, Volume 10, Issue 8
      Author(s): Abdellah Miloudi, Douniazad El Abed, Gerard Boyer
      The triphenylbismuth diacetate reacted selectively with different aminoindazole derivatives in presence of copper diacetate to engender a new series of mono phenyl aminoindazole compounds in good to high yields. Moreover, the same reagent with 4-chloro-2-methyl-2H-indazol-7-amine led to a mixture of mono- and N,N-diphenylaminoindazoles. However, its combination with 2H-indazol-4-amine provided only one N,1-diphenylaminoindazole compound.

      PubDate: 2017-12-26T01:49:49Z
      DOI: 10.1016/j.arabjc.2014.08.003
       
  • Thermal, photo-oxidation and antimicrobial studies of linalyl acetate as a
           major ingredient of lavender essential oil

    • Authors: Suzan Khayyat
      Abstract: Publication date: Available online 24 December 2017
      Source:Arabian Journal of Chemistry
      Author(s): Suzan Khayyat
      Lavender oil, obtained from the flowers of Lavandula angustifolia (Family: Lamiaceae) by steam distillation, The major component of lavender oil is linalyl acetate was isolated and subjected to oxidation thermally and photochemically using (mcpba and H2O2) respectively to produce mixture of 6,7-epoxy-3,7-dimethyl-1-octene-3-yl acetate (3) and 1,2-epoxy-3,7-dimethyl-6-octene-3-yl acetate (4) photochemicaly, While produced epoxide 4 only thermally . On the other hand, photooxygenation of 1 using different singlet oxygen sensitizers gave two hydroperoxide derivatives of 6-hydroperoxy-3, 7-dimethylocta-1,7-diene-3-yl acetate (5) and 7-hydroperoxy-3,7-dimethylocta-1,5-diene-3-yl acetate (6) in the presence of tetraphenyl porphin (TPP), whereas gave hydroperoxide 6 only using hematoporphyrin (HP). Studies on the antimicrobial especially Microsporum canis and Microsprum gallinna showed that linalyl acetate and its epoxide and hydroperoxide derivatives have a good antibacterial action.

      PubDate: 2017-12-26T01:49:49Z
      DOI: 10.1016/j.arabjc.2017.12.008
       
  • Molybdenum Disulfide (MoS2) Nanosheets Vertically Coated on Titanium for
           Disinfection in the Dark

    • Authors: Kaiwei Tang; Lanyu Wang; Hao Geng; Jiajun Qiu; Huiliang Cao; Xuanyong Liu
      Abstract: Publication date: Available online 24 December 2017
      Source:Arabian Journal of Chemistry
      Author(s): Kaiwei Tang, Lanyu Wang, Hao Geng, Jiajun Qiu, Huiliang Cao, Xuanyong Liu
      Previous studies demonstrated that the antibacterial action of molybdenum disulfide (MoS2) is highly dependent on the light-activated potential of reactive oxygen species (ROS) generation; here vertically aligned molybdenum disulfide nanosheets (MoS2, with or without doping of iron) were coated on titanium (Ti) substrates via a one-step hydrothermal reaction, and their excellent activity against both Escherichia coli (E. coli, ATCC 25922) and Staphylococcus aureus (S. aureus, ATCC 25923) was evidenced under dark conditions. Release of MoO4 2- and generation of MoS2-inspired ROS were found to be the key factors answering for the bactericidal property of the nanosheets. What’s more, iron-doping in terms of FeMoO4 could boost the antibacterial efficacy further, which stems from quick release of Fe2+ and generation of ROS by Fenton-like reactions. Accordingly, it is believed that the dark antibacterial efficacy of the vertically aligned MoS2 nanosheets is guaranteed by uniting ion release and ROS generation. This study provides new insight into design and application of MoS2 coatings for disinfection of biomedical devices, where light is hard to be served.
      Graphical abstract image

      PubDate: 2017-12-26T01:49:49Z
      DOI: 10.1016/j.arabjc.2017.12.013
       
  • Synthesis, characterizations, and antibacterial properties of PbMoO4
           nanocrystals

    • Authors: J.V.B. Moura; T.S. Freitas; A.R.P. Silva; A.T.L. Santos; J.H. da Silva; R.P. Cruz; R.L.S. Pereira; P.T.C. Freire; C. Luz-Lima; G.S. Pinheiro; H.D.M. Coutinho
      Abstract: Publication date: Available online 24 December 2017
      Source:Arabian Journal of Chemistry
      Author(s): J.V.B. Moura, T.S. Freitas, A.R.P. Silva, A.T.L. Santos, J.H. da Silva, R.P. Cruz, R.L.S. Pereira, P.T.C. Freire, C. Luz-Lima, G.S. Pinheiro, H.D.M. Coutinho
      This study reports the synthesis and characterization of PbMoO4 nanocrystals and the antibacterial properties and modulation of their antibiotic activity. Lead molybdate nanocrystals were obtained through the conventional hydrothermal method, and the structural, vibrational and morphological properties of the sample were determined using X-ray diffraction, Raman and infrared spectroscopy, and scanning electron microscopy images. The obtained samples present scheelite-type tetragonal structure (space group I41/a) without secondary phases, and the Raman spectrum shows the formation of PbMoO4 structurally ordered at short-range, confirming the quality of the samples. The antibacterial and antibiotic-modulation activities were performed in triplicate using the microdilution method. The minimum inhibitory concentration (MIC) of antibiotics alone or in association with PbMoO4, were demonstrated using geometric mean. When assayed directly, the PbMoO4 presented a MIC ≥ 1024 μg/mL against all bacterial strains tested. When in association with the gentamicin against Staphylococcus aureus, a synergism was observed reducing 37.5% the MIC. However, in the assays against the Gram-negative strains was observed that the presence of lead affected the effect of the antibiotic, leading to an antagonism.

      PubDate: 2017-12-26T01:49:49Z
      DOI: 10.1016/j.arabjc.2017.12.014
       
  • Broad spectral inhibitory effects of pale green zinc oxide nanophosphor on
           bacterial and fungal pathogens

    • Authors: H.J. Amith Yadav; B. Eraiah; H. Nagabhushana; B. Daruka Prasad; R.B. Basavaraj; M.K. Sateesh; J.P. Shabaaz Begum; G.P. Darshan; G.R. Vijayakumar
      Abstract: Publication date: Available online 21 December 2017
      Source:Arabian Journal of Chemistry
      Author(s): H.J. Amith Yadav, B. Eraiah, H. Nagabhushana, B. Daruka Prasad, R.B. Basavaraj, M.K. Sateesh, J.P. Shabaaz Begum, G.P. Darshan, G.R. Vijayakumar
      Nd3+ doped zinc oxide nanophosphor were prepared by a modified sonochemical route. Adsorption of aloe vera (A.V.) gel by the precursors made the final product with controlled the morphology, that is A.V. gel acted as surfactant. Characterization studies confirmed the pure hexagonal phase with nanostructure, wide-bandgap was reported. Major electronic transitions in the prepared samples were due to 4f shell electrons of Nd3+ions. Emission peaks attributed to 2P3/2→ 4I13/2, 2P3/2→4I15/2, 1I6→3H4, 2P1/2→4I9/2 and 4G7/2→4I9/2 transitions under the excitation wavelength of 421 nm. The emitted wavelengths showed the redshift from blue to pale green region. Further, the prepared samples showed very good control over the growth of microbial pathogens such as Staphylococcus aureus, Escherichia coli, Klebsiella pneumonia, Pseudomonas aeruginosa, Alternaria alternata and Fusarium oxysporum. The proposed mechanism is that the ZnO:Nd3+ intertwinds the bacteria and fungal pores with a heterogeneous range of superstructues, resulting in the local perturbation at cell membrane of fungal cells. This induces the decrease the potential energy at bacterial membrane and the leakage of electrolytes of fungal spores. There is a mechanical wrapping interaction between pathogens and the nanoparticles which locally damages the cell membrane and causes cell lysis. Biocompatible, ZnO:Nd3+ nanostructures possesses antibacterial activity against more multi-resistant bacterial and fungal phytopathogens. This additional information provides useful scientific information to prevent the various crop diseases.

      PubDate: 2017-12-26T01:49:49Z
      DOI: 10.1016/j.arabjc.2017.12.012
       
  • Development and validation of RT-HPLC-DAD method for biogenic amines
           determination in probiotic yogurts

    • Authors: Carla Paulo Vieira; Marion Pereira da Costa; Vitor L.M. Silva; Beatriz da Silva Frasao; Letícia F.M. Campos de Aquino; Yves E.C. de Oliveira Nunes; Carlos Adam Conte-Junior
      Abstract: Publication date: Available online 16 December 2017
      Source:Arabian Journal of Chemistry
      Author(s): Carla Paulo Vieira, Marion Pereira da Costa, Vitor L.M. Silva, Beatriz da Silva Frasao, Letícia F.M. Campos de Aquino, Yves E.C. de Oliveira Nunes, Carlos Adam Conte-Junior
      A new procedure for the determination of biogenic amines (BAs), putrescine, cadaverine, spermidine, spermine and tyramine, based on the purification through precipitation and centrifugation of peptides in an acid extract from the sample is proposed. The novelty of the procedure in relation to the liquid-liquid purification reported in the literature is based on shortening the time of analysis and reducing BAs losses during sample preparation. The procedure permitted better precision, recovery, and sensibility, particularly in lower concentration levels, when compared to extraction without purification before derivatization. The method was applied to the simultaneous determination of the five aforementioned BAs in commercial yogurt samples by reversed-phase high-performance liquid chromatography (RP-HPLC). The procedure presented adjusted correlation coefficients between 0.980 and 0.997, and linear range in samples of 1-50 mg.L-1 (cadaverine), 3-50 mg.L-1 (putrescine, spermidine and spermine) and 5-50 mg.L-1 (tyramine), with accuracy ranging from 67.81% to142.78% in the limit of quantification (LOQ) and from 88.99% to118.26% in other concentration levels. The limit of detection of BAs in yogurt samples was 0.18-4.01 mg.L-1, while LOQ ranged between1-5 mg.L-1. The intraday relative standard deviation was ≤ 15.74% in LOQ and ≤ 10.05% in other concentration levels. The purification step by precipitation was fundamental to eliminate the interferences present in the yogurt samples, and it was relevant to increase the sensitivity of BAs detection when compared to liquid-liquid purification.

      PubDate: 2017-12-26T01:49:49Z
      DOI: 10.1016/j.arabjc.2017.12.010
       
  • Influence of oxygen functionalization on physico-chemical properties of
           imidazolium based ionic liquids - experimental and computational study

    • Authors: Aleksandar Tot; Črtomir Podlipnik; Marija Bešter-Rogač; Slobodan Gadžurić; Milan Vraneš
      Abstract: Publication date: Available online 16 December 2017
      Source:Arabian Journal of Chemistry
      Author(s): Aleksandar Tot, Črtomir Podlipnik, Marija Bešter-Rogač, Slobodan Gadžurić, Milan Vraneš
      In this work, four different oxygen functionalized ionic liquids, 1-(3-hydroxypropyl)-3-methylimidazolium chloride,[OHC3mIm][Cl], 1-(3-hydroxypropyl)-3-ethylimidazolium chloride ([OHC3eIm][Cl], 1-(2-oxobutyl)-3-methylimidazolium chloride,[C2OC2mIm][Cl] and 1-(4-hydroxy-2-oxobutyl)-3-methylimidazolium chloride, [OHC2OC2mIm][Cl] were synthesized in liquid state at room temperature. Detailed physico-chemical characterisation (density, viscosity and conductivity) supported with computational simulations for pure ionic liquid and their aqueous solutions were performed. Based on these examinations, interactions in pure ionic liquids and interactions between water and synthesized ionic liquids were discussed.

      PubDate: 2017-12-26T01:49:49Z
      DOI: 10.1016/j.arabjc.2017.12.011
       
  • A Novel Interfacial Polymerization Approach Towards Synthesis of Graphene
           Oxide-incorporated Thin Film Nanocomposite Membrane with Improved Surface
           Properties

    • Authors: G.S. Lai; W.J. Lau; P.S. Goh; Y.H. Tan; B.C. Ng; A.F. Ismail
      Abstract: Publication date: Available online 15 December 2017
      Source:Arabian Journal of Chemistry
      Author(s): G.S. Lai, W.J. Lau, P.S. Goh, Y.H. Tan, B.C. Ng, A.F. Ismail
      The conventional interfacial polymerization (IP) technique that requires a rubber roller in removing amine aqueous solution is likely to cause uneven distribution of nanomaterials on microporous substrate during thin film nanocomposite (TFN) membrane fabrication. A novel IP technique was developed in this work to pre-coat the substrate with graphene oxide (GO) nanosheets followed by vacuum filtration of amine aqueous solution through the substrate before initiating polyamide cross-linking process. This novel technique was also employed to fabricate a composite membrane that contained no nanomaterials. The results showed that the GO-incorporated TFN membrane exhibited 71.7% and 129.4% higher pure water flux compared to the composite membranes without GO incorporation that were synthesized using conventional and filtration IP technique, respectively. The water enhancement of the TFN membrane could be attributed to the existence of hydrophilic GO that was distributed evenly throughout the substrate surface coupled with the formation of porous selective layer that reduced water transport resistance. Besides exhibiting promising rejection against divalent ions, the newly developed TFN membrane also showed significantly lower water flux deterioration in filtrating bovine serum albumin and Reactive Black 5 solution. The enhanced membrane antifouling resistance was mainly due to the improved membrane surface properties that minimize deposition and adsorption of foulants on the TFN membrane surface.
      Graphical abstract image

      PubDate: 2017-12-26T01:49:49Z
      DOI: 10.1016/j.arabjc.2017.12.009
       
  • Manganese porphyrins as efficient catalysts in solvent-free cyclohexane
           oxidation

    • Authors: Mariana Goes de Araujo Tôrres; Vinicius Santos da Silva; Ynara Marina Idemori; Gilson DeFreitas-Silva
      Abstract: Publication date: Available online 14 December 2017
      Source:Arabian Journal of Chemistry
      Author(s): Mariana Goes de Araujo Tôrres, Vinicius Santos da Silva, Ynara Marina Idemori, Gilson DeFreitas-Silva
      Novel non-symmetric third-generation manganese metalloporphyrins, chlorido(5-(4-nitrophenyl)-10,15,20-triphenyl-2,3,7,8,12,13,17,18 octobromoporphyrinate)manganese(III) (MnBr8P1) and the mixture of isomers chlorido(5,10-(4-nitrophenyl)-15,20-diphenyl-2,3,7,8,12,13,17,18 –octabromopor-phyrinate)manganese(III) and chlorido(5,15-(4-nitrophenyl)-10,20-diphenyl-2,3,7,8,12,13,17,18-octabromoporphyrinate)manganese(III) (cis/trans-MnBr8P2) were obtained from their second-generation analogues (MnP1 and cis/trans-MnP2). These four catalysts were used in cyclohexane oxidation reactions with iodosylbenzene (PhIO) or iodobenzene diacetate (PhI(OAc)2) in the presence or absence of solvent (CH2Cl2). Cyclohexanol (Cy-ol) and cyclohexanone (Cy-one) were the sole reaction products. Regardless of the system, third-generation catalysts MnBr8P1 and cis/trans-MnBr8P2 performed better than second-generation catalysts (MnP1 and cis/trans-MnP2, respectively). In solvent systems, cis/trans-MnBr8P2 afforded a greater total yield (%Cy-ol +%Cy-one) than systems using MnBr8P1, with an increase from 80 to 89% in PhIO and from 47 to 57% in PhI(OAc)2. The systems without solvent, showed to be viable and presented significant yields with PhIO as oxidant, with total yield of 30% for MnBr8P1, and 55% for cis/trans-MnBr8P2. Additionally, in systems with third-generation catalysts without solvent, selectivity was close to 100% for Cy-ol.

      PubDate: 2017-12-26T01:49:49Z
      DOI: 10.1016/j.arabjc.2017.12.007
       
  • Preparation of porous hybrid adsorbents based on fluor(calcium
           silicate)/activated carbon and its application in the removal of iron
           (III) from ammonium phosphate solutions

    • Authors: Xin-hua Zhu; Jun Li; Yang Jin; Yun-hai Guo
      Abstract: Publication date: Available online 13 December 2017
      Source:Arabian Journal of Chemistry
      Author(s): Xin-hua Zhu, Jun Li, Yang Jin, Yun-hai Guo
      The high concentration of Fe3+ ions present in ammonium phosphate solutions have a significant effect on product quality and product morphology. Herein, hybrid adsorbents fluor(calcium silicate)/activated carbon (FCS/AC) combined with fluor(calcium silicate) (FCS) and activated carbon (AC) were prepared, characterized, and applied in the removal of Fe3+ ions from ammonium phosphate solutions. FCS/AC held both advantages of FCS and AC indicating a significant adsorption for Fe3+ ions. The adsorption kinetics, isotherms and thermodynamics of Fe3+ onto FCS/AC were investigated. The effect of solution pH, initial Fe3+ concentration, temperature and contact time on the adsorption of Fe3+ onto FCS/AC were also investigated. Desorption-resorption experiments of FCS/AC for Fe3+ ions were examined by the batch method using different eluents. The results showed that FCS/AC was an excellent, low cost and reusable adsorbent for the removal of Fe3+ ions from ammonium phosphate solutions, and the adsorption process appeared to follow the pseudo-second-order kinetic model and Langmuir isotherm model with a maximum Fe3+ adsorption of 15.41 mg/g. Various thermodynamic parameters such as △G 0, △H 0 and △S 0 were calculated indicating the feasibility of the process and spontaneous nature of the adsorption.

      PubDate: 2017-12-26T01:49:49Z
      DOI: 10.1016/j.arabjc.2017.12.006
       
  • Effect of l-threonine on growth and properties of ammonium dihydrogen
           phosphate crystal

    • Authors: J.H. Joshi; S. Kalainathan; D.K. Kanchan; M.J. Joshi; K.D. Parikh
      Abstract: Publication date: Available online 13 December 2017
      Source:Arabian Journal of Chemistry
      Author(s): J.H. Joshi, S. Kalainathan, D.K. Kanchan, M.J. Joshi, K.D. Parikh
      Ammonium dihydrogen phosphate (ADP) is an important nonlinear optical (NLO) material used for electro-optical applications and finds various NLO applications using Nd:YAG and Nd:YLF Lasers. The Amino acids have properties like molecular chirality and zwitter ionic nature helps to improve NLO properties of ADP. The pure and l-threonine doped ADP crystals are grown using slow solvent evaporation technique at room temperature. The Powder XRD spectra suggest tetragonal crystal system and slight shifting of peak. The FT-IR spectra verify the presence of various functional groups of pure and doped ADP crystals. The FT-Raman shows strong absorption peak at 922 cm−1 due to asymmetric stretching of PO4 3− for all samples without shifting indicating the single phase nature of all samples. The photoluminescence study suggests the presence of defects in doped samples compared to the pure one due to increase of Stokes shift and vibrational energy relaxation phenomena. The presences of constituent elements are indentified using CHN analysis. The optical transmittance, energy band gap, skin depth, refractive index and extinction coefficient is study using UV–Visible spectroscopy and the dispersive behaviour of refractive index below absorption edge is study using Wemple-DiDomenico single oscillator model. The variation of capacitance and conductance is study using complex admittance spectroscopy. All the grown crystals have possessed negative photoconductivity. The second and third harmonic generation efficiency is increased nearly to double for l-threonine doped ADP crystals compared to pure Potassium dihydrogen phosphate (KDP). The laser damage threshold is measure for pure and doped ADP crystals.

      PubDate: 2017-12-26T01:49:49Z
      DOI: 10.1016/j.arabjc.2017.12.005
       
  • Understanding the Adsorption of newly Benzylidene-aniline derivatives as a
           Corrosion Inhibitor for Carbon steel in Hydrochloric acid solution:
           Experimental, DFT and Molecular Dynamic Simulation Studies

    • Authors: M.E. Belghiti; S. Bouazama; S. Echihi; A. Mahsoune; A. Elmelouky; A. Dafali; K.M. Emran; B. Hammouti; M. Tabyaoui
      Abstract: Publication date: Available online 11 December 2017
      Source:Arabian Journal of Chemistry
      Author(s): M.E. Belghiti, S. Bouazama, S. Echihi, A. Mahsoune, A. Elmelouky, A. Dafali, K.M. Emran, B. Hammouti, M. Tabyaoui
      Corrosion inhibition of carbon steel in hydrochloric acid solution was inspected using newly Benzylidene-aniline derivatives namely: (E)-N(2-Chlorobenzylidene)-2-Fluorobenzenamine (NCF) and (E)-N(2-Chlorobenzylidene)-3-Chloro-2-Methylbenzenamine (NCCM), by potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) techniques. The experimental results showed that both NCF and NCCM are good inhibitors for carbon steel in 1M HCl.The inhibition efficiency increases with inhibitors concentration rise, reaching a value up to 89.72% at 10-3 M for the inhibitor NCF. Electrochemical impedance data show a frequency distribution of the capacitance, simulated as constant phase element (CPE). Polarization curves study revealed that both inhibitors are mixed type. The adsorption on the carbon steel surface follows Langmuir isotherm model with negative values of Δ G ads 0 .Thermodynamics data for the adsorption process are calculated and discussed.The effect of molecular structure on inhibition efficiency was investigated by quantum chemical calculations using density function theory (DFT). Furthermore, Monte Carlo simulation technique incorporating molecular mechanics and molecular dynamic was applied to search for the best configurationally space for (NCCM or NCF)/100H2O/α-Fe2O3(111) systems. The results indicate that the adsorption energy of NCF was greater than NCCM which is in accordance with the experimentally determined inhibition efficiency.

      PubDate: 2017-12-26T01:49:49Z
      DOI: 10.1016/j.arabjc.2017.12.003
       
  • Synergism of thiocyanate ions and microinterfacial surface as driving
           forces for heavy multi-metals extraction

    • Authors: Daniela Cadar; Nicoleta Liliana Olteanu; Elena Adina Andrei; Adina Roxana Petcu; Cosmina Andreea Marin; Aurelia Meghea; Maria Mihaly
      Abstract: Publication date: Available online 9 December 2017
      Source:Arabian Journal of Chemistry
      Author(s): Daniela Cadar, Nicoleta Liliana Olteanu, Elena Adina Andrei, Adina Roxana Petcu, Cosmina Andreea Marin, Aurelia Meghea, Maria Mihaly
      A comprehensive study has been carried out to evaluate the extraction of heavy metals mixture (Co2+, Cr3+, Cu2+, Ni2+) from aqueous media by Winsor II non-ionic microemulsion, containing polyoxyethylene (4) lauryl ether as non-ionic surfactant and butyl acetate as organic phase. The extraction mechanism is based on the formation of thiocyanate complexes of metals and their transfer from aqueous to microemulsion phase, either towards the interfacial film of surfactant (Co2+) or into the core of micelles (Cr3+, Cu2+, Ni2+). The value of the distribution coefficient for Co2+ was higher than for the other studied metals and its extraction efficiency was not dependent on the working conditions, showing a maximum value (99.99%) in all cases. By using successive extractions, chromium, nickel and copper ions that remained in the aqueous phase after first extraction were transported into the microemulsion phase, leading to an increase in the extraction efficiency up to 99.99% for chromium and copper, and 85% for nickel. Based on pH influence, a selective extraction of Co2+ and Cr3+ can be achieved, since the cobalt ions were completely extracted into the microemulsion phase at pH = 1, and the chromium ions still remained in the aqueous phase.

      PubDate: 2017-12-26T01:49:49Z
      DOI: 10.1016/j.arabjc.2017.11.018
       
  • Ganoderma applanatum-mediated green synthesis of silver nanoparticles:
           structural characterization and in vitro and in vivo biomedical and
           agrochemical properties

    • Authors: Sudisha Jogaiah; Mahantesh Kurjogi; Mostafa Abdelrahman; Hanumanthappa Nagabhushana; Lam-Son Phan Tran
      Abstract: Publication date: Available online 8 December 2017
      Source:Arabian Journal of Chemistry
      Author(s): Sudisha Jogaiah, Mahantesh Kurjogi, Mostafa Abdelrahman, Hanumanthappa Nagabhushana, Lam-Son Phan Tran
      This study presents the use of basidiomycete extracts as an effective platform for “green synthesis” of silver nanoparticles (AgNPs). Out of seven basidiomycete species, Ganoderma applanatum displayed the highest antimicrobial properties against the tested pathogens. Thus, G. applanatum methanol crude extract was fractionated using column chromatography, and the obtained fractions were subjected to an antimicrobial assay followed by phytochemical analyses using high-performance liquid chromatography to select the best fraction for synthesis of AgNPs. Fraction 3 displayed potent antimicrobial activities as evidenced by its high phenolic content, and thus was used for AgNP biosynthesis. The G. applanatum fraction 3-synthesized AgNPs were then characterized using various microscopy, spectroscopy and X-ray diffraction techniques. The characteristic features of the synthesized AgNPs indicated the spherical shape of AgNPs with an average size of 20-25 nm. The synthesized AgNPs exhibit high antioxidant capacity, in vitro antibacterial activity against Staphylococcus aureus and Escherichia coli, and in vivo antifungal properties against Botrytis cinerea and Colletotrichum gloeosporioides in tomato and strawberry leaflet assays, respectively. Our results demonstrated that G. applanatum can be efficiently used in synthesis of AgNPs with potent antimicrobial properties, which can be used for both clinical and agrochemical purposes.

      PubDate: 2017-12-26T01:49:49Z
      DOI: 10.1016/j.arabjc.2017.12.002
       
  • Remarkable effect of L-Ascorbic acid on crystal morphology, structural,
           crystalline perfection, optical, Photoluminescence and dielectric
           properties of Zinc(tris) thiourea sulphate (ZTS) single crystals

    • Authors: Mohd. Shkir; V. Ganesh; S. AlFaify; I.S. Yahia; K.K. Maurya
      Abstract: Publication date: Available online 8 December 2017
      Source:Arabian Journal of Chemistry
      Author(s): Mohd. Shkir, V. Ganesh, S. AlFaify, I.S. Yahia, K.K. Maurya
      Large size growth of Zinc(tris) thiourea sulphate (ZTS) crystals has been successfully done through slow evaporation technique in presence of L-Ascorbic acid (LAA). The possibility of any extra phase due to presence of LAA was ruled out through structural analysis. The deviation in lattice parameters and shift in peaks position indicates the interaction of LAA with ZTS. Crystalline perfection of grown crystals was judged by High-resolution X-ray diffraction (HRXRD) study and found that the crystalline perfection of ZTS in presence of 10 wt% LAA is enhanced compared to others. The low optical absorbance and high band gap confirms its application in optoelectronic devices. A burly blue emission band at 460 nm was observed in Photoluminescence spectra of ZTS crystals grown in presence of LAA when excited at 310 and 358 nm both. However, when these specimens were excited at 385 nm this blue emission band is observed at 470 nm. The remarkable enhancement of blue band emission intensity was noted which may be attributed due to presence of defects (color centers). Further the dielectric measurement was done and shows that the dielectric constant has been improved due to presence of dye. The enhanced optical band gap, photoluminescence intensity and dielectric constant suggests that the LAAZTS single crystals are suitable for electro-optic device applications.

      PubDate: 2017-12-26T01:49:49Z
      DOI: 10.1016/j.arabjc.2017.12.001
       
  • Directly grown of 3D-Nickel oxide nano flowers on TiO2 nanowire arrays by
           hydrothermal route for electrochemical determination of naringenin
           flavonoid in vegetable samples

    • Authors: M. Siva Prasad; R. Chen; Hongwei Ni; K. Kiran Kumar
      Abstract: Publication date: Available online 8 December 2017
      Source:Arabian Journal of Chemistry
      Author(s): M. Siva Prasad, R. Chen, Hongwei Ni, K. Kiran Kumar
      A novel an electrochemical sensor is constructed based on three-dimensional Nickel oxide nano flowers (3D-NiO) and TiO2-nanowire arrays (TiO2NWA) by hydrothermal route. Initially TiO2-NWA were produced on titanium foil using hydrothermal method in the presence of 1.0 M NaOH solution at 180°C for 20 h, then 3D-nickel oxide nano (NiO) flowers (up to 3 µM) are directly grown on TiO2 NWA using hydrothermal reaction in the presence of glucose, urea and nickel acetate mixer solution at 150°C for 5h, followed by N2 gas assisted annealing at 500°C for 2h. The resultant nanostructures are characterized by CV, XRD, FESEM-EDX and TEM. The as prepared electrodes are used as electrochemical sensors for investigating electrochemical behavior of naringenin (NRG) flavonoid. Further differential pulse voltammetry is used to determine the NRG in vegetable (tomato and ginger) samples at optimized conditions, such as accumulation potential, time, the applied sample volume, pH of the buffer and the step potential. The finest oxidation peaks are observed for NRG in acidic condition (phosphate buffer solution) at around 0.35 V. The obtained oxidation peaks were observed at low current values over the concentration of 1.50×10-8 M to 2.35×10-4 M with lower detection limit of 0.025 nM for NRG. Mainly the presence of carbon (glucose) enhanced the conductivity and surface area of the as prepared electrode (NiO/TiO2NWA). The nano composite modified electrode (NiO/TiO2NWA) displays good stability, high sensitivity and reproducibility. The recommended method is effectively applied an economical and simple sensor for the present investigation.

      PubDate: 2017-12-26T01:49:49Z
      DOI: 10.1016/j.arabjc.2017.12.004
       
  • N-haloacetyl phenothiazines and derivatives: Preparation, characterization
           and structure-activity relationship for antifungal activity

    • Authors: Gabriela P. Sarmiento; M. Florencia Martini; Roxana G. Vitale; Lucas E. Fabian; Javier Afeltra; Daniel Vega; Graciela Y. Moltrasio; Albertina G. Moglioni
      Abstract: Publication date: Available online 5 December 2017
      Source:Arabian Journal of Chemistry
      Author(s): Gabriela P. Sarmiento, M. Florencia Martini, Roxana G. Vitale, Lucas E. Fabian, Javier Afeltra, Daniel Vega, Graciela Y. Moltrasio, Albertina G. Moglioni
      A serie of N-acetyl phenothiazines and related compounds was synthesized by means of the acetylation reaction of the corresponding phenothiazine with the appropriate reagent using microwave irradiation. Structural elucidation of these heterocyclic derivatives was done using 1H, 13C NMR spectra. The equilibra between conformationals enantiomers were studied as a possible atropisomerism case. The single crystal X-ray diffraction of some derivatives was also recorded and the presence of enantiomers could be confirmed. The antifungal activity evaluation of all N-acetyl phenothiazines prepared by us in this and in a previous work, was performed in vitro against 163 isolated human pathogenic yeasts and filamentous fungi, including: Cryptococcus neoformans, Candida albicans, Candida non-albicans, Aspergillus and Acremonium-Fusarium. The most promising compounds were those bearing one chlorine or bromine atom attached to the N-acetyl group. These compounds were as active as 5-fluorocitosine (5-FC) or fluconazole (FCZ), currently in clinical use. A structure-activity relationship (SAR) and a quantitative structure-activity relationship (QSAR) for antifungal activity of each genus were established.
      Graphical abstract image

      PubDate: 2017-12-26T01:49:49Z
      DOI: 10.1016/j.arabjc.2017.11.019
       
  • Design and development a novel uranyl sensor based on FePt/ZnIn2S4
           core-shell semiconductor nanostructures

    • Authors: Hossein Zeynali; Mohammadhassan Motaghedifard; B.F.O. Costa; Hossein Akbari; Zohreh Moghadam; Morteza Babaeianfar; Mohammad Javad Rashidi
      Abstract: Publication date: Available online 2 December 2017
      Source:Arabian Journal of Chemistry
      Author(s): Hossein Zeynali, Mohammadhassan Motaghedifard, B.F.O. Costa, Hossein Akbari, Zohreh Moghadam, Morteza Babaeianfar, Mohammad Javad Rashidi
      In this study, the FePt core, ZnIn2S4 shell and FePt-ZnIn2S4 core-shell nanostructures were successfully synthesized using solvothermal process. Temperature dependent hysteresis behavior of as-synthesized nanoparticles (NPs) FePt and FePt/ZnIn2S4 showed super paramagnetic response at 300 K and ferromagnetic properties with a coercive field (H c) of 2830 Oe and 970 Oe at 2 K, respectively. Also, the blocking temperature (T B) estimating by the peak in ZFC curves was about 26 K for FePt and about 46 K for FePt/ZnIn2S4 NPs. After the identification process of nanostructure, using electrochemical methods, the behavior of FePt-ZnIn2S4 core-shell@PGE was studied in 0.1 M phosphate buffer solution (PBS) containing 5.0 mM [Fe(CN)6]3−/4−. The EIS complex plane plots showed a drastic change in the charge transfer resistance of the probe redox reaction as a function of UO2 2+ concentration. This behavior was used for construction of the calibration curve, and a linear range from 0.5 to 10.0 μM UO2 2+ with a detection limit of 71.7 nM.

      PubDate: 2017-12-26T01:49:49Z
      DOI: 10.1016/j.arabjc.2017.11.014
       
  • Carnivorous plants used for green synthesis of silver nanoparticles with
           broad-spectrum antimicrobial activity

    • Authors: Rafal Banasiuk; Marta Krychowiak; Daria Swigon; Wojciech Tomaszewicz; Angelika Michalak; Agnieszka Chylewska; Magdalena Ziabka; Marcin Lapinski; Barbara Koscielska; Magdalena Narajczyk; Aleksandra Krolicka
      Abstract: Publication date: Available online 2 December 2017
      Source:Arabian Journal of Chemistry
      Author(s): Rafal Banasiuk, Marta Krychowiak, Daria Swigon, Wojciech Tomaszewicz, Angelika Michalak, Agnieszka Chylewska, Magdalena Ziabka, Marcin Lapinski, Barbara Koscielska, Magdalena Narajczyk, Aleksandra Krolicka
      In this study, we exploit the anti-oxidative potential of four carnivorous plants to produce uniform and biologically active silver nanoparticles. The use of polyvinylpyrrolidone promoted synthesis of quasi-spherical nanoparticles characterized by stability and high uniformity. Their activity was tested against three human pathogens and three species of plant pathogenic bacteria. The study demonstrates the influence of synthesis method (microwave irradiation or heat radiation) and plant extract composition on nanoparticle activity. The total anti-oxidative potential of the plant extract, as well as the applied method of silver ions reduction proved to be crucial for antimicrobial activity. The highest minimal bactericidal concentration (mean value = 10 µg/mL) was obtained for silver nanoparticles synthesized with the use of water extract from Dionaea muscipula tissue.

      PubDate: 2017-12-26T01:49:49Z
      DOI: 10.1016/j.arabjc.2017.11.013
       
  • Enhanced Sunlight driven photocatalytic performance and visualization of
           latent fingerprint by green mediated ZnFe2O4–RGO nanocomposite

    • Authors: V.S. Amrutha; K.S. Anantharaju; D.S. Prasanna; Dinesh Rangappa; Krushitha Shetty; H. Nagabhushana; K. Ashwini; Y.S. Vidya; G.P. Darshan
      Abstract: Publication date: Available online 2 December 2017
      Source:Arabian Journal of Chemistry
      Author(s): V.S. Amrutha, K.S. Anantharaju, D.S. Prasanna, Dinesh Rangappa, Krushitha Shetty, H. Nagabhushana, K. Ashwini, Y.S. Vidya, G.P. Darshan
      The present study reveals a simple and efficient method for the green reduction of graphene oxide (GO) employing Emblica officinalis fruit extract as a reducing agent. Here, a green sol–gel method has been reported for the preparation of ZnFe2O4 and ZnFe2O4-reduced graphene oxide (RGO) nanocomposite (NCO) using Aloe Vera extract as a capping agent. PXRD, FT-IR, SEM, TEM and HRTEM confirmed the analytical aspects of synthesized samples. The band gaps of prepared samples were estimated by UV–Vis analysis. PL quenching appears due to the interaction between the surface of the ZnFe2O4 and RGO sheets. The photoluminescence analysis indicates that the present NCO is an effective white component in display applications. The NCO was found to be an alternate to traditional luminescent powder for a safe detection and qualitative improvement of latent fingerprints deposited onto different surfaces. Further, excellent photocatalytic properties of NCO when compared to that of the commercial P25 for various other dye degradation under Sunlight can be attributed to its specific electrical properties and well connected arrangement derived from the structural support of ZnFe2O4 and RGO. This results in significant electron-acceptor/transport of RGO material that are able to decrease the photo-generated electron–hole recombination thus enhancing the photocatalytic performance.
      Graphical abstract image

      PubDate: 2017-12-26T01:49:49Z
      DOI: 10.1016/j.arabjc.2017.11.016
       
  • Inside Front Cover - Editorial Board

    • Abstract: Publication date: December 2017
      Source:Arabian Journal of Chemistry, Volume 10, Issue 8


      PubDate: 2017-12-26T01:49:49Z
       
  • Nanocomposites based on cationic polyelectrolytes and silver
           nanoparticles: Synthesis, characterization, molybdate retention and
           antimicrobial activity

    • Authors: Manuel Palencia; Alexander Córdoba; Manuel F. Melendrez
      Abstract: Publication date: Available online 1 December 2017
      Source:Arabian Journal of Chemistry
      Author(s): Manuel Palencia, Alexander Córdoba, Manuel F. Melendrez
      The objective of this work was to synthesize nanocomposites based on cationic polyelectrolytes and silver nanoparticles using poly(N-vinylbenzyl-N-triethylammonium chloride) as polymer phase. For that, a nanostructured crosslinker was synthesized from silver nanoparticles (AgNPs) and acrylic acid. Molybdate retention properties of nanocomposites were studied in function of pH and ionic strength. In addition, their antimicrobial properties were evaluated against E. coli and S. aureus. It was evidenced that AgNPs can be stabilized using acrylic acid and that this material can be incorporated to the polymer phase during polymerization by free radical of cationic monomers. The effect of pH on retention of molybdate, by the nanostructured polymer, was significant only to low ionic strength (the order seen was pH 5.0 > pH 7.0 > pH 9.0 for 0.0% NaCl). Results suggest that the main interaction influencing the molybdate retention is electrostatic in nature. Finally, antimicrobial activity was enhanced by incorporation of polymerizable nanostructured crosslinker based on AgNPs.

      PubDate: 2017-12-26T01:49:49Z
      DOI: 10.1016/j.arabjc.2017.11.020
       
  • Influence of different 3-D electrodes towards the performance of gold
           recovery by using an electrogenerative process

    • Authors: Nurul Ashikin Roslan; Faiz Bukhari Mohd Suah; Norita Mohamed
      Abstract: Publication date: Available online 28 November 2017
      Source:Arabian Journal of Chemistry
      Author(s): Nurul Ashikin Roslan, Faiz Bukhari Mohd Suah, Norita Mohamed
      In this study, gold was recovered by using an electrogenerative process employing a batch cell. This system is based on Galvanic cell which it does not require any external power supply but it produces an electrical energy by a spontaneous chemical reaction in which gold is reduced at cathode and zinc is oxidized at anode. The performances of three-dimensional electrodes, reticulated vitreous carbon (RVC) and porous graphite sheet (PG) were used as cathodes and investigated based on the time and percentage of gold recovery. In batch cell system, RVC served as the best cathode material, having the highest recovery rate with >99% of gold being recovered in 1 h operation for gold concentration of 100 mg L−1. Cyclic voltammetry and mass transfer studies were conducted to study the characteristics of these cathodes for gold deposition. Based on the cyclic voltammograms, RVC and PG undergoes redox reaction within range 1200 mV to −600 mV. Finally, based on the cyclic voltammograms, it was found that gold reduction was observed at 0.2–0.1 V of potential range while oxidation peak was occurred at a potential range between 0.8 and 1.0 V.

      PubDate: 2017-12-26T01:49:49Z
      DOI: 10.1016/j.arabjc.2017.11.015
       
  • Selenotriapine – An isostere of the most studied thiosemicarbazone with
           pronounced pro-apoptotic activity, low toxicity and ability to challenge
           phenotype reprogramming of 3-D mammary adenocarcinoma tumors

    • Authors: Nenad R. Filipović; Snežana K. Bjelogrlić; Sveva Pelliccia; Vesna B. Jovanović; Milan Kojić; Milan Senćanski; Giuseppe La Regina; Romano Silvestri; Christian D. Muller; Tamara R. Todorović
      Abstract: Publication date: Available online 28 November 2017
      Source:Arabian Journal of Chemistry
      Author(s): Nenad R. Filipović, Snežana K. Bjelogrlić, Sveva Pelliccia, Vesna B. Jovanović, Milan Kojić, Milan Senćanski, Giuseppe La Regina, Romano Silvestri, Christian D. Muller, Tamara R. Todorović
      Triapine, the most studied α-N-heterocyclic thiosemicarbazone, revealed potent activity against advanced leukemia, but was ineffective against a variety of solid tumors. Moreover, methemoglobinemia, which is a side effect of triapine administration, may limits all clinical application. To enhance anticancer activity and reduce side effects, we applied an isosteric replacement of sulfur to selenium atom was performed by synthesis and characterization of selenium triapine analog, 3-aminopyridine-2-carboxaldehyde selenosemicarbazone (selenotriapine). Compared to triapine, selenotriapine revealed superior pro-apoptotic activity with activation of intrinsic apoptotic pathway in both human monocytic leukemia (THP-1) and mammary adenocarcinoma (MCF-7) cell lines. For MCF-7 2-D cultures, selenotriapine induced notable increase in mitochondrial superoxide radical generation and dissipation of mitochondrial transmembrane potential. A significant delay in growth of MCF-7 spheroids (3-D culture) was accompanied by phenotypic stem cell reprogramming (Oct-4 expression). Additionally, selenotriapine demonstrated a very low toxicity profile as compared to triapine, confirmed over alleviated extent of methemoglobin formation and higher IC50 value in brine shrimp cytotoxicity assay.

      PubDate: 2017-12-26T01:49:49Z
      DOI: 10.1016/j.arabjc.2017.11.017
       
  • Fabrication of β-cyclodextrin and sialic acid copolymer by single pot
           reaction to site specific drug delivery

    • Authors: Parbeen Singh; Xiaohong Ren; Yaping He; Li Wu; Caifen Wang; Haiyan Li; Vikramjeet Singh; Jiwen Zhang
      Abstract: Publication date: Available online 24 November 2017
      Source:Arabian Journal of Chemistry
      Author(s): Parbeen Singh, Xiaohong Ren, Yaping He, Li Wu, Caifen Wang, Haiyan Li, Vikramjeet Singh, Jiwen Zhang
      The fabrication of supramolecular host in combination biomolecules is an interesting idea in modern drug delivery for development of new polymer with advanced chemical and biological properties. Herein, hyper-crosslinked copolymer was fabricated from β-cyclodextrin (β-CD) and sialic acid (SA) monomers, which can be undoublty considered as a new class of copolymer. The as-synthesized copolymer has complexation properties, which could cover the drug within the structure and deliver to the site of action. The well-known inclusion capability of β-CD and targeted efficacy of SA made it more appropriate for targeted drug delivery. The copolymer was characterized using a wide range of spectroscopic and microscopic techniques such as synchrotron radiation based FTIR spectroscopy (SR-FTIR), differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), and powder X-ray diffraction (PXRD). The surface area and porosity were calculated by using Nitrogen adsorption method. Doxorubicin (Dox) was selected as a model drug to evaluate the loading efficiency and cellular penetration ability of the copolymer. The copolymer showed high adsorption towards Dox with no significant cytotoxic effects on HeLa cells as proved by cell viability assay. High cellular penetration of Dox loaded copolymer was also recorded by confocal microscopy when compared with free Dox in HeLa cells at 4 h of exposure. Thus, β-CD-SA copolymer could be a useful carrier for targeted drug delivery of cancer and has the potential for further investigation in viral and nervous disease due to the targeting ability of SA.

      PubDate: 2017-12-26T01:49:49Z
      DOI: 10.1016/j.arabjc.2017.11.011
       
  • Green synthesis and fabrication of an electrochemical and colorimetric
           sensor based on self-assembled peptide-Au nanofibril architecture

    • Authors: Wensi Zhang; Jundan Xi; Yongcao Zhang; Zhiqiang Su; Gang Wei
      Abstract: Publication date: Available online 24 November 2017
      Source:Arabian Journal of Chemistry
      Author(s): Wensi Zhang, Jundan Xi, Yongcao Zhang, Zhiqiang Su, Gang Wei
      Owing to the excellent self-assembly properties and chemical flexibility, amyloid peptide were employed to build multifunctional architectures. Herein, we demonstrated the self-assembly of gold nanoparticles (AuNPs) in assistant of a sequence-designed peptide. As both surface ligands and self-assembly scaffolds of AuNPs, the formation of amyloid peptide nanofibrils could drive the self-assembly of AuNPs to form a fibrous hybrid architecture, which exhibits excellent electrochemical and colorimetric sensing performances. As a result, the electrochemical sensing towards H2O2 achieved a linear response range of from 0.1 to 25.85 mM (R2 = 0.997), and the detection limit was calculated to be 3.43 μM (S/N = 3). This self-assembled nanofiber was also employed for Hg2+ detection. The sensor produced a color change which can readout with naked eye and UV–visual spectroscopy, with a linear detection range of 10–70 μM of Hg2+ ion sample (R2 = 0.991).

      PubDate: 2017-12-26T01:49:49Z
      DOI: 10.1016/j.arabjc.2017.11.012
       
  • Lanthanum oxide nanoparticles immobilized reduced graphene oxide polymer
           brush nanohybrid for environmental vitiation of organic dyes

    • Authors: Navin Kumar Mogha; Saransh Gosain; Dhanraj T. Masram
      Abstract: Publication date: Available online 21 November 2017
      Source:Arabian Journal of Chemistry
      Author(s): Navin Kumar Mogha, Saransh Gosain, Dhanraj T. Masram
      In the present work, uniformly distributed Lanthanum Oxide nanoparticles on poly (tetrahydrofurfuryl methacrylate) brushes spread over the surface of reduced graphene oxide (La2O3/PTHF/rGO) are synthesized. La2O3/PTHF/rGO is used as catalyst for the degradation of Rhodamine B (RhB), Methyl Orange (MO) and Eosine Y (ESY) dyes. Catalyst has shown excellent catalytic activity as evident by the apparent Rate constant (kapp), which is found to be 26.8, 28.6, and 20.5 (×10−3 s−1), for RhB, MO and ESY respectively, much higher than the reported in literature. The catalyst is recycled for five times without any significant loss in its activity, which makes it suitable for the applications in catalysis and waste water management.
      Graphical abstract image

      PubDate: 2017-12-26T01:49:49Z
      DOI: 10.1016/j.arabjc.2017.11.008
       
  • A highly active copper-based metal-organic framework catalyst for a
           friedel–crafts alkylation in the synthesis of bis(indolyl)methanes under
           ultrasound irradiation

    • Authors: Huong T.D. Nguyen; The T. Nguyen; Phuong T.K. Nguyen; Phuong Hoang Tran
      Abstract: Publication date: Available online 21 November 2017
      Source:Arabian Journal of Chemistry
      Author(s): Huong T.D. Nguyen, The T. Nguyen, Phuong T.K. Nguyen, Phuong Hoang Tran
      A robust copper-based metal-organic framework (MOF) catalyst, termed MOF-891, was successful applied to the synthesis of the family of bioactive compounds, bis(indolyl)methanes, through a Friedel–Crafts alkylation under ultrasound irradiation. The remarkable catalytic activity of MOF-891 was proven by the successful synthesis of bis(indolyl)methanes in high yield (up to 96%) and purity. In MOF-891, there exist two types of copper clusters, one discrete and one infinite rod, both are formed through water molecules triggering hydrogen bonds demonstrated the participation as catalytic active site for the Friedel–Crafts alkylation reaction. The well-defined construction of hydrogen bonds in MOF-891 along with Lewis copper sites attributed a stable catalysis activity and exhibited the heterogeneous nature with no significant loss of catalytic performance after six cycles.
      Graphical abstract image

      PubDate: 2017-12-26T01:49:49Z
      DOI: 10.1016/j.arabjc.2017.11.009
       
  • Chemically functionalized activated carbon with 8-hydroxyquinoline using
           aryldiazonium salts/diazotization route: Green chemistry synthesis for
           oxins-carbon chelators

    • Authors: Nawader F. AlQadhi; Awadh O. AlSuhaimi
      Abstract: Publication date: Available online 21 November 2017
      Source:Arabian Journal of Chemistry
      Author(s): Nawader F. AlQadhi, Awadh O. AlSuhaimi
      The past few years witnessed the emergence of aryldiazonium salts as versatile coupling agents for the functionalization of carbon and other substrates. Although the approach has demonstrated extensive applications in many fields, its use for the synthesis of chelating resins has not been explored. In this work, the concept has been exploited to develop an ecofriendly synthetic method for carbon based chelators. Herein, the p-nitroanline aryldiazonium salt was generated (in situ) in presence of hypophosphorous acid and covalently grafted onto activated carbon (AC) to allow addition of 8-hydroxyquinoline (8-HQ) via diazo coupling. The successfulness of the functionalization was confirmed by DRIR, XPS, and TGA. The risen was packed into cartridges and used with standard solid phase extraction (SPE) apparatus for the extraction of trace metals; Cd(II), Ni(II), Mn(II), Zn(II) and Pb(II) from groundwater samples prior to their measurement by ICPMS. The resin exhibited more 50% enhancement in capacity exchange relative to the plain AC. Under the optimum conditions the sorption capacity of the sorbent was 0.393, 0.170, 0.345, 0.092, 0.314 mmol g−1 for Mn(II), Cd(II), Ni(II), Pb(II) and Zn(II) respectively. The sorbent showed efficient performance when applied for SPE of trace metals from groundwater certified reference materials BCR-609 and groundwater real samples from AlMadinah AlMumnawarah, Saudi Arabia.

      PubDate: 2017-12-26T01:49:49Z
      DOI: 10.1016/j.arabjc.2017.11.010
       
  • High resolution LC-MS characterization of phenolic compounds and the
           

    • Authors: Tanmay Kumar Koley; Zareen Khan; Dasharath Oulkar; B.K. Singh; Arti Maurya; B. Singh; Kaushik Banerjee
      Abstract: Publication date: Available online 16 November 2017
      Source:Arabian Journal of Chemistry
      Author(s): Tanmay Kumar Koley, Zareen Khan, Dasharath Oulkar, B.K. Singh, Arti Maurya, B. Singh, Kaushik Banerjee
      This study reports qualitative profiling of the phenolic compounds in an indigenously developed purple radish genotype VRRAD-151 using ultra performance liquid chromatography with quadrupole time of flight mass spectrometry. The root and leaf samples were harvested at the horticultural maturity stage of the genotype. Roots were divided into the periderm, and xylem, and the leaf samples were divided into petiole, and lamina, and these were separately extracted with methanol before the LC-MS analysis. A total of 66 compounds, including 23 flavonols, 1 dihydroflavonols, 4 flavonones, 4 flavones, 28 anthocyanins, 2 isoflavonoids, 3 phenolic acids, and 1 hydroxybenzaldehyde were putatively identified based on high resolution accurate mass analysis with the data processing through UNIFI®, which is a comprehensive compound identification software solution. An in-house developed database comprising the secondary metabolites of polyphenols was used for the screening purpose, and each phenolic compound was identified based on the detection of the precursor ion, and at least one characteristic fragment ion, each with less than 5 ppm of mass error. Anthocyanins were the most abundant type of phenolics exhibiting 59% in leaf petiole, 80% in root periderm, and 90% in root xylem. The relative concentration of anthocyanins was lower (11%) in the leaf lamina. Cyanidins were the most predominant anthocyanins accounting for 54, 100, 90 and 65%, in leaf lamina, leaf petiole, root periderm and root xylem, respectively. Eight anthocyanins and 25 flavonols (except kaempferol-3-O-p-coumaryl-shophoroside-7-O-glucoside) are tentatively new identifications and reported for the first time in radish. Flavonols were found to be the predominant group of phenolic compounds in the leaf lamina, and interestingly, the gradient of antioxidant activity followed the (relative) concentration gradient of flavonols in the samples. The relative antioxidant activity of various fractions when compared with each other, followed the trend: leaf lamina > root periderm > leaf petiole ≈ root xylem. Based on the results it can be reflected that this genotype can be utilized as a functional food for management of various human and animal diseases. Since the detected anthocyanins were mostly present in acylated forms, this genotype can function as a potential source of stable natural colorants.

      PubDate: 2017-12-26T01:49:49Z
      DOI: 10.1016/j.arabjc.2017.11.007
       
  • Tandem chalcone-sulfonamide hybridization, cyclization and further
           Claisen–Schmidt condensation: Tuning molecular diversity through
           reaction time and order and catalyst

    • Authors: Mirian R.C. de Castro; Raquel Ferreira Naves; Aline Bernardes; Cameron Capeletti da Silva; Caridad Noda Perez; Andrea Felinto Moura; Manoel Odorico de Moraes; Felipe Terra Martins
      Abstract: Publication date: Available online 16 November 2017
      Source:Arabian Journal of Chemistry
      Author(s): Mirian R.C. de Castro, Raquel Ferreira Naves, Aline Bernardes, Cameron Capeletti da Silva, Caridad Noda Perez, Andrea Felinto Moura, Manoel Odorico de Moraes, Felipe Terra Martins
      We here report the synthesis of novel chalcone-sulfonamide compounds based on the hybridization at 2′ position and nitro substitution at the side chalcone phenyl ring followed by tandem cyclization into quinolinone derivatives and then a further aldol condensation only as a function of the reaction time. Therefore, for the first time, we have controlled the sequential preparation of chalcone-sulfonamide hybrids, quinolinones and then (E)-3-ene-2,3-dihydroquinolinones simply stopping reaction over increasing time periods. Furthermore, a new molecular scaffold based on a chalcone-(bis)sulfonamide hybrid has been gotten through changing the sequence of coupling reactions and catalyst. This study means practical and useful ways of constructing in high yields new biologically active compounds bearing diversified molecular scaffolds.
      Graphical abstract image

      PubDate: 2017-12-26T01:49:49Z
      DOI: 10.1016/j.arabjc.2017.11.005
       
  • Synthesis, characterization and quantum yields of multichromic
           poly(azomethine)s containing carbazole unit

    • Authors: İsmet Kaya; Esra Kılavuz; Kevser Temizkan
      Abstract: Publication date: Available online 16 November 2017
      Source:Arabian Journal of Chemistry
      Author(s): İsmet Kaya, Esra Kılavuz, Kevser Temizkan
      Poly(azomethine)s containing phosphor, silane and carbazole were synthesized with multiple stage and examined through different photophysical, electrochemical, and thermal behaviours. Following substances were synthesized as an initial step: N-hexyl-carbazole (CH) and N-hexyl-carbazolaldehyde (CHDA), via elimination reaction in argon media and N-hexyl-carbazole azomethine (CHA) via condensation reaction of CHDA with 4-aminophenol also poly(azomethine)s (P-Si-CHA, P-P-CHA) containing silane and phosphor via elimination reaction. The structures of synthesized compounds were confirmed by Fourier-transform infrared spectroscopy (FT-IR), Ultraviolet–visible spectroscopy (UV–Vis) and nuclear magnetic resonance spectroscopy (NMR). Electrochemical properties of compounds were examined with cyclic voltammetry (CV) technique. Fluorescence measurements were utilized to investigate the photochemical behaviors by photoluminescence (PL) analysis. CHA compound surprisingly presented multicolor emission behavior (when excited at 370, 420, 480, 540 and 580 nm, the solution emitted blue, green, yellow, orange and red lights, respectively) with relatively high quantum yield (19.9%) in DMF solvent. Additionally, thermal behaviors of all compounds were determined by TG and DSC techniques. Surface morphologies of polymers were imaged with scanning electron microscope (SEM).
      Graphical abstract image

      PubDate: 2017-12-26T01:49:49Z
      DOI: 10.1016/j.arabjc.2017.11.004
       
  • Phosphoric acid functionalized graphene oxide: A highly dispersible
           

    • Authors: Masoumeh Zakeri; Ebrahim Abouzari-lotf; Mikio Miyake; Shahram Mehdipour-Ataei; Kamyar Shameli
      Abstract: Publication date: Available online 16 November 2017
      Source:Arabian Journal of Chemistry
      Author(s): Masoumeh Zakeri, Ebrahim Abouzari-lotf, Mikio Miyake, Shahram Mehdipour-Ataei, Kamyar Shameli
      Carbon-based catalysts are gained significant interest for improving a number of catalytic processes due to their unique set of benefits. However, a few of such catalysts are proper for synthesis of organic compounds in water. Therefore, there is a strong need for developing water-tolerant and dispersible catalysts. Here, we demonstrate a simple and efficient method for the preparation of highly dispersible phosphonic acid functionalized carbocatalyst. The applied functionalization method was flexible in controlling the functionalization level. The prepared nanocatalyst exhibited superior catalytic performance toward multicomponent synthesis of pyrano[2,3-c]pyrazole, with 80–90% yield within 15 min in water. Moreover, this water-tolerant solid acidcatalyst could be simply retrieved and after 6 successive cycles of reactions, the reaction time and yield still keeps within the same level.
      Graphical abstract image

      PubDate: 2017-12-26T01:49:49Z
      DOI: 10.1016/j.arabjc.2017.11.006
       
  • Correlation between crystallite size and photocatalytic performance of
           micrometer-sized Monoclinic WO3 particles

    • Authors: Asep Bayu Dani Nandiyanto; Rena Zaen; Rosi Oktiani
      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
      DOI: 10.1016/j.arabjc.2017.10.010
       
  • A Theoretical Assessment of Antioxidant Capacity of Flavonoids by means of
           Local Hyper–Softness

    • Authors: Claudia Sandoval-Yañez; Carolina Mascayano; Jorge I. Martínez-Araya
      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
      DOI: 10.1016/j.arabjc.2017.10.011
       
 
 
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