Arabian Journal of Chemistry

Description

  • Impact factor
    2.27
  • 5-year impact
    0.00
  • Cited half-life
    2.00
  • Immediacy index
    0.34
  • Eigenfactor
    0.00
  • Article influence
    0.00
  • ISSN
    1878-5352

Publications in this journal

  • Arabian Journal of Chemistry 01/2015;
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    ABSTRACT: This work concerns 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 alcoholic aqueous system. The impact of different polymerization conditions such as co-monomer concentration and ratio, polymerization time, polymerization temperatures, initiator concentration and co-solvent composition on the polymerization yield and particle size were studied. Maximum polymerization yield, 70%, was obtained with MMA:AN (90%:10%) comonomer composition. Particles size ranged from 16 nm to 1483 nm was obtained and controlled by variation polymerization conditions. The co-polymerization process was proved through FT-IR and TGA analysis. The copolymer composition was investigated by nitrogen content analysis. Copolymers with 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 preparation of nanoparticles from comonomers without using emulsifiers or dispersive agents.
    Arabian Journal of Chemistry 01/2015;
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    ABSTRACT: We have synthesized 2, 5-diformyl-1H-pyrrole)bis(methan-1-yl-1-ylidene)dimalonohydrazone (DPBMD) and characterized by elemental analysis, FT-IR, UV-Vis, Mass, 1H and 13CNMR spectroscopy. Theoretical calculations were performed by ab initio RHF and density functional theory (DFT) / B3LYP method, 6-31G(d,p) and 6-311++G(d,p) basis sets. The calculated scaled vibrational frequencies values have been compared with experimental FT-IR spectrum. The calculated result shows excellent agreement between experimental and calculated frequencies at B3LYP method and 6-311++G(d,p) basis set. The thermodynamics properties, NBO, nonlinear optical properties and mulliken charges of DPBMD have also been analyzed. Involvement of nitrogen [N8 / N18] and [N14 / N24] lone pairs of electron with [π∗(C9-O10), π∗(C6-N7) / π∗(C16-N17), π∗(C19-O20)] and [(π∗(C12-O13) / π∗(C22-O23)] leads to an enormous stabilization of 84.6 / 84.6 and 64.1 / 64.1 kcal/mol of the molecule. A combined experimental and theoretical stretching wavenumbers symmetric (3003, 3332 cm-1) and asymmetric (3276, 3398 cm-1) analysis confirms free NH2 groups in DPBMD. The calculated first hyperpolarizability (β0 = 5.80 x 10-30 esu) at B3LYP method and 6-311++G(d,p) basis sets indicates that DPBMD can be used as an attractive material for non–linear optical. The electronic descriptor analysis indicates that DPBMD is a good precursor for heterocyclic synthesis and as ligand for metal complex formation. The preliminary bioassay suggested that the DPBMD compound exhibits relatively good antibacterial and fungicidal activity against Escherichia coli, Pseudomonas aeruginosa, Staphylococcus aureus, Streptococcus pyogenes, Candida albicans, Aspergillus niger.
    Arabian Journal of Chemistry 01/2015;
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    ABSTRACT: A new and simple strategy is applied to resolve kinetic profile for the reaction of an analyte in unknown matrices, using standard addition method (SAM). The proposed method uses kinetic spectrophotometric data obtained by standard addition of analyte into unknown mixtures followed by the reaction of analyte with a proper reagent. The proposed method extracts kinetic profile for the reaction of an analyte by averaging the kinetic profiles obtained by subtraction of kinetic profiles after and before standard addition. The rate constant can be obtained using computational curve fitting. The performance of method was evaluated by using synthetic data as well as several experimental data sets. The proposed method can be applied to obtain kinetic profiles of the reactions in the presence of additive interference as well as multiplicative interferences. Hydroxylation reaction of diphenylcarbazide (DPCI) in the presence of diphenylcarbazone (DPCO) as a real system at various pHs was also studied by the present method. The rate constant and the order of the hydroxylation reaction were determined from extracted kinetic profiles.
    Arabian Journal of Chemistry 12/2014; 78.
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    ABSTRACT: Since Reactive Blue 21 (RB21) is one of the dye compounds which is harmful to human’s life, a simple and sensitive method to remove this pollutant from wastewater is using Nano Zero-Valent Iron (NZVI) catalyst. In this paper, a Central Composite Rotatable Design (CCRD) was employed for response surface modeling to optimize experimental conditions of the RB21 removal from aqueous solution. The significance and adequacy of the model was analyzed using analysis of variance (ANOVA). Four independent variables- i.e. catalyst amount (0.1-0.9 g), pH (3.5-9.5), removal time (30-150 s) and dye concentration (10-50 mg/L)- were transformed to coded values and consequently second order quadratic model was built to predict the responses. The result showed that under optimized experimental conditions the removal of RB21 was over 95%.
    Arabian Journal of Chemistry 12/2014; 6.
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    ABSTRACT: The present study is part of the evaluation of extracts of Glycine max L. Merr and Hibiscus L. Sabdariffa as antioxidants. A comparative study was performed with extracts of yellow Tea and commercial Red Wine, two foods known for their antioxidant activity. The method applied is free radical scavenging using the 1, 1-diphenyl-2-picrylhydrazyl (DPPH°). The antioxidant properties were identified and measured by the determining the anti-radical activity reducing index, expressed in percentage % RSA (Radical Scavenger Activity), and by the determination of the Colouring Intensity (IC50). All results are compared to those of ascorbic acid as reference antioxidant. The results indicate the following order for the antioxidant power of the extracts tested. % RSA (Tea) > % RSA (Glycine max) % > RSA (Red Wine) % > RSA (Sabdariffa Hibiscus), and Colouring intensities (IC50) ranging from 4.62 μM (ascorbic acid) to 1.10 μM (Hibiscus sabdariffa) correlated with their chemical structure and the content of phenolic compounds.
    Arabian Journal of Chemistry 12/2014; 3.
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    ABSTRACT: Lepisorus thunbergianus (Kaulf.) (LET) is an evergreen fern found on rocks and tree trunks that is distributed in East and Southeast Asia. Our previous study showed that the methanol extract from LET had significant anti-oxidant activity, but the active components of LET are still unclear. In the present study, isovitexin, orientin, isoorientin and chlorogenic acid were isolated from LET under the guidance of antioxidant activity. In addition, the structure of isovitexin, orientin, isoorientin and chlorogenic acid were characterized using matrix-assisted laser desorption/ionization time of flight mass spectrometry (MALDI-TOF-MS) and nuclear magnetic resonance spectroscopy (NMR). Orientin and isoorientin presented similar activities toward the DPPH, with half maximal inhibitory concentrations (IC50) of 15–17 μmol, and inhibition of reactive oxygen species (ROS) production by 50% at 100 μmol. Chlorogenic acid significantly inhibited intracellular ROS and nitric oxide (NO) production and had a strong effect toward DPPH. Furthermore, chlorogenic acid demonstrated decreased iNOS, COX-2, IFN-β and TNF-α gene expression. These findings demonstrate the potential anti-inflammatory effects of chlorogenic acid. Isoorientin, at a concentration of 100 μmol, showed 50% inhibition of human liver cancer cells (Huh7 and HepG2). These results suggest that compounds isolated from LET have potential to prevent liver cancer cell lines.
    Arabian Journal of Chemistry 12/2014; 90.
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    ABSTRACT: The aqueous and hydroalcoholic extracts of borage (Borago officinalis) leaves from Annaba region (Algeria) were preliminary analyzed for their phenolic profile (total phenolics, total flavonoids, total flavanols, total tannins and total anthocyanins). These extracts were evaluated for their antioxidant properties by different methods such as DPPH radical scavenging, test NBT and total antioxidant activity. The two extracts have exhibited a high antiradical capacity. Indeed, the ethanolic extract showed the lower IC50 values and the highest amount of phenolics (94.09 ± 1.72 mg gallic acid/g dry extract). Using LC-MS/MS analysis, it was possible to identify phenolic acids, flavonoids, sterol and for the first time oleuropein was identified in the aqueous extract of the plant. The obtained results have demonstrated that phenolic compounds are the major contributor to the antioxidant activity of plants.
    Arabian Journal of Chemistry 12/2014;
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    ABSTRACT: The object of this work is to develop a simple and selective method for efficient extraction of Au(III) ions in aqueous solution using a new solid-phase extraction sorbent. Polyethylenimine (PEI) ion-exchange polymer was coated on alumina in the presence of NaNO3. The method is based on sorption of Au3+ ions on 50 mg PEI/Al2O3. A solution of 0.5 M thiourea, then 1.0 M HCl effectively eluted the gold ion and then aspirated into flame atomic absorption spectroscopy (FAAS). The influence of flow rate of sample solution and eluent, the pH effect, eluent type and sorption capacity was investigated. The effects of various diverse ions for preconcentration and separation of the gold ion were investigated. Relative standard deviation of 4.0 μg mL−1 of gold was 1.46% (n = 10). The detection limit was 26.2 ng L−1 in original solution. The method has been applied successfully for the recovery of trace amount of Au(III) ions from water samples.
    Arabian Journal of Chemistry 11/2014; 33.
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    ABSTRACT: New nanomeric 3-thioxo-5-methoxy-4,5-dihydro-6-methyl-9-unsubstituted/substituted-1,2,4-triazino[5,6-b]indoles (2a–c) and 3-thioxo-5-methoxy-4,5-dihydro-6,7-dihydroxy-1,2,4-triaino[5,6]-cyclobut-6-ene (3) were prepared via reaction of thiosemicarbazide with 5-unsubstitutedand/substituted-indol-2,3-diones and/or 3,4-dihydroxycyclobutane-1,2-dione in methanol–concentrated HCl at room temperature. A series of mercury(II)–ligand salts e.g. compound 4b and Hg(II) complexes 5a,b and 6 of cyclic Schiff base were prepared. Structures of these compounds were established by elemental analysis and spectral measurements. The redox characteristics of selected compounds were studied for use as chelating agents for stripping voltammetric determination of mercuric(II) ions in aqueous media. The compounds were also screened for their use as molluscicidal agents against Biomophalaria Alexandrina Snails responsible for Bilhariziasis.
    Arabian Journal of Chemistry 11/2014;
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    ABSTRACT: Photochemical reaction is a chemical reaction initiated by the absorption of energy in the form of light resulting in the different types of reaction. Chromones, bischromones and anthraquinones are the bichromophoric molecules which contain carbonyl group and double bond in conjugation. Photochemical reactions of these compounds result in the formation of such molecules which are not obtained via conventional methods. This review article describes the photochemical transformations of chromones, bischromones and anthraquinone derivatives and here main emphasis has been laid upon the intramolecular photochemical H-abstraction reactions that provide many exotic heterocyclics as the final photoproducts.
    Arabian Journal of Chemistry 11/2014;
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    ABSTRACT: Emergence of antibiotic resistance has become an increasingly important public health issue. Although several new antibiotics have been developed in the last few decades, none of them shows improved activity against multidrug-resistant bacteria. Silver nanoparticles (AgNPs) have long been known for their broad-spectrum antibacterial effects. The development of a rapid, dependable, simple, cost-effective, biocompatible, and environmentally friendly method to synthesize nanoparticles is an essential aspect of current biomedical research. This paper describes the extracellular biochemical synthesis of AgNPs using supernatants from Bacillus cereus cultures and characterization of the synthesized AgNPs, using several analytical techniques. The nanoparticles showed a maximum absorbance at 420 nm in ultraviolet-visible spectra. Particle size analysis by dynamic light scattering and transmission electron microscopy revealed the formation of homogeneous and well-dispersed nanoparticles with an average size of 10 nm. We investigated the dose-dependent antibacterial activity of AgNPs against Escherichia fergusonii and Streptococcus mutans. In addition, the efficiency of AgNPs with various broad-spectrum antibiotics against these test strains was evaluated. The results show that the combination of antibiotics with AgNPs has significant antimicrobial effects. The greatest enhancement was observed with gentamycin and vancomycin against E. fergusonii and S. mutans, respectively. This work supports that AgNPs can be used to enhance the activity of existing antibiotics against Gram-negative and Gram-positive bacteria.
    Arabian Journal of Chemistry 11/2014;
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    ABSTRACT: The efficiency of stearate as a corrosion inhibitor for magnesium alloy ZE41 has been studied in sodium sulfate medium, employing electrochemical techniques like potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). The results of polarization study imply that stearate functions as a mixed-type corrosion inhibitor with a predominant anodic control. The adsorption of stearate on alloy surface is found to obey the Langmuir adsorption isotherm. The proposed inhibition mechanism involved adsorption of stearate onto metal surface, followed by precipitation of magnesium stearate within the microdefects of Mg(OH)2 surface film which enhanced the barrier effect of an otherwise porous partially protective film.
    Arabian Journal of Chemistry 11/2014;
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    ABSTRACT: Novel 1,4-dihydropyridines (1,4- DHPs) are prepared efficiently via Hantzsch reaction using aldehydes, benzylacetoacetate and catalytic amount of iron(III) phosphate under solvent-free conditions in good yields.
    Arabian Journal of Chemistry 11/2014;
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    ABSTRACT: Phytochemical investigation of the antidiabetic chloroform fraction of the ethanolic extract obtained from the aerial parts of Callistemon lanceolatus DC led to the isolation of three new phytoconstituents, one flavone, 8-(1’’-hydroxyisopranyl)-5,6-dihydroxy-7,4’-dimethoxy flavone (1) and two phenolic esters, 2, 3, 4-trihydroxyphenethyl tetracontanoate (2) and 2, 3, 4-trihydroxyphenethyl tetracontanoate-4-β-xylopyranoside (3). The isolated compound 1 exhibited significant in vivo blood glucose lowering effect comparable to the standard drugs Pioglitazone and Rosiglitazone in streptozotocin induced diabetic rats without causing any toxic effect on pancreas and liver. Compound 1 showed a glide score of -7.89 against PPAR-γ target in molecular docking studies which is significantly higher than the glide score of reference molecule Rosiglitazone (glide score of -5.77). Compound 1 also exhibited moderate in vitro PPAR-γ transactivation activity of 48.52% in comparison to standard drugs rosiglitazone and pioglitazone, which showed a transactivation activity of 80.47 and 65.27% respectively.
    Arabian Journal of Chemistry 11/2014;
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    ABSTRACT: Non-noble metal Ni with different loadings was coated on precipitated CeO2-ZrO2 support by sonochemistry method and examined for catalytic wet air oxidation of phenol. The structure of the nanocatalysts was determeined by BET, FESEM, XRD, and FTIR analyses. The results showed non-uniform morphology of the nanocatalyst at lower Ni contents changed to homogenous morphology with spherical nano particles at higher Ni contents. While the size of NiO crystals remained constant with rising Ni content, the crystallinity of NiO significantly increased. If the crystallinity of NiO was 100% in 20%wt Ni/CeO2-ZrO2, the crystallinity of NiO in 5%wt Ni was found 41.13%. The average particle size in Ni(15%)/CeO2-ZrO2 was 77 nm in which 85.71% of particle diameters were less than 100 nm. Catalytic we air oxidation of phenol with different Ni loadings indicated improvement of phenol destruction at higher amount of active phase. Removal of phenol increased with increasing catalyst loading from 4 to 9.0 g/l but further increase of catalyst loading to 10 g/l declined the catalyst reactivity.
    Arabian Journal of Chemistry 11/2014;
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    ABSTRACT: The effects of cement dust on the yield and chemical composition of the essential oil were investigated in Cupressus sempervirens. Exposure to cement dust resulted in significant increase in the essential oil yields. Significant factory distance-related changes in qualitative and quantitative composition of the essential oil were observed. Increasing pollution with dust increased the content of monoterpene hydrocarbons concomitant to increase of α-pinene, suggesting a redirection of the secondary metabolism of C. sempervirens towards biosynthesis of monoterpenes. By contrast, oxygenated monoterpenes and sesquiterpene hydrocarbons were strongly reduced. These results provide an overall picture of the different response of monoterpenes and sesquiterpenes to air pollution caused by cement dust. They also reveal the suitability of using C. sempervirens in the creation of green areas around cement factories and encourage the use of dusted plants as potential source of valuable natural products.
    Arabian Journal of Chemistry 11/2014;
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    ABSTRACT: The oxidation of 3,4,5-trimethoxy benzaldehyde (TMBA), benzaldehyde (BA) and dimethylamino benzaldehyde (DMABA) in N,N-dimethyl formamide (DMF) by tetraethylammonium bromochromate (TEABC) resulted in the formation of the corresponding acids. The reaction is first order with respect to both TEABC and the aldehydes. The reaction is catalyzed by toluene-p-sulfonic acid (p-TsOH). The hydrogen ion dependence has the form: kobs = a + b [H+]. The reaction has been studied in different percentage of DMF - acetic acid mixture. The effect of dielectric constant of the medium indicate that the reaction to be of ion-dipole type. Various thermodynamic parameters for the oxidation have been reported and discussed along with the validity of isokinetic relationship. Reason for high rate in the case of oxidation of N,N-dimethylamino benzaldehyde is also described. A mechanism involving formation of a chromate ester intermediate in the slow step has been proposed.
    Arabian Journal of Chemistry 11/2014;