Mansoor S.S.,C Abdul Hakeem College |
Shafi S.S.,Islamiah College
Journal of Molecular Liquids | Year: 2010
The oxidation of benzyl alcohol (BnOH) and a few para-substituted benzyl alcohols by tripropylammonium fluorochromate (TriPAFC) in dimethylsulphoxide (DMSO) leads to the formation of corresponding aldehydes. The reaction is first order each in TriPAFC and the alcohols. The reaction is catalysed by hydrogen ions. The hydrogen ion dependence has the form: kobs = a + b[H +]. The oxidation of α α′-dideuterio benzyl alcohol exhibited a substantial primary kinetic isotope effect (kH/k D = 5.45 at 303 K). Oxidation of benzyl alcohol was studied in 19 different organic solvents. The solvent effect has been analysed using Kamlet's and Swain's multiparametric equation. A mechanism involving a hydride ion transfer via chromate ester is proposed. © 2010 Elsevier B.V. All rights reserved.
Basha S.K.,C Abdul Hakeem College |
Kumari V.S.,Auxilium College
Asian Pacific Journal of Tropical Disease | Year: 2012
Objective: To evaluate the glucose uptake of (antidiabetic activity) crude n-hexane, ethanol, ethanol and aqueous leaf extracts of P. guajava. Methods: P. guajava leaf extracts were subjected to inhibitory effect of glucose utilization using specific standard in vitro procedure. Results: Results in four different leaf extracts revealed that, the methanol extract at a concentration of 50g plant extract/l was found to be more potent than other extracts with the lowest mean glucose concentration of 201+1.69 mg/dl at the end of 27 hrs. Conclusions: The present findings suggest that, the methanolic extract showed a significant inhibitory effect on glucose diffusion in vitro thus validating the traditional claim of the plant. © 2012 Asian Pacific Tropical Medicine Press.
Sheik Mansoor S.,C Abdul Hakeem College |
Syed Shafi S.,Islamiah College
Arabian Journal of Chemistry | Year: 2014
The oxidation kinetics of some para-substituted anilines by benzimidazolium fluorochromate (BIFC) have been studied in aqueous acetic acid media in the presence of perchloric acid. The reaction is first order with respect to both aniline and BIFC and is catalysed by a hydrogen ion. The rate data obey Hammett relationship. The products of oxidation are the corresponding azo benzenes. Based on the kinetic results and product analysis, a suitable mechanism has been proposed for the reaction of BIFC with anilines. © 2010.
Mansoor S.S.,C Abdul Hakeem College
E-Journal of Chemistry | Year: 2011
The kinetics of oxidation of methionine (Met) by tripropylammonium fluorochromate (TriPAFC) has been studied in the presence of chloroacetic acid in aqueous acetic acid medium. The reaction is first order with respect to methionine, TriPAFC and acid. The reaction rate has been determined at different temperatures and activation parameters calculated. With an increase in the amount of acetic acid in its aqueous mixture, the rate increases. The reaction does not induce polymerization of acrylonitrile. A suitable mechanism has been proposed.
Jayaseelan C.,C Abdul Hakeem College |
Rahuman A.A.,C Abdul Hakeem College
Parasitology Research | Year: 2012
The use of acaricides had limited efficacy in reducing tick infestations and is often accompanied by serious drawbacks, including the selection of acaricide resistant ticks, contamination of environment, and milk and meat products with drug residues. The present study was based on assessments of the antiparasitic activities to determine the efficacy of synthesized silver nanoparticles (AgNPs) utilizing aqueous leaf extract of Ocimum canum Sims (Labiatae) against the larvae of Hyalomma anatolicum (a.) anatolicum Koch, 1844 and Hyalomma marginatum (m.) isaaci Sharif, 1928 (Acari: Ixodidae). The synthesized AgNPs results were recorded from UV-vis spectrum, X-ray diffraction (XRD) analysis, Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDX) analysis. The production of the AgNPs synthesized from the leaf extract of O. canum was evaluated through UV- visible spectrophotometer in a range of wavelength from 300 to 600 nm. This revealed a peak at 426 nm in leaf extracts of O. canum, indicating the production of AgNPs. The XRD spectrum compared with the standard confirmed spectrum of silver particles formed in the present experiments were in the form of nanocrystals, as evidenced by the peaks at 2θ values of 27.71©, 32.16©, 38.08©, 46.15©, 54.70©and 57.35©. The FTIR spectra of AgNPs exhibited prominent peaks at 818, 1,045, 1,381 and 1,616 in the region 500-3,000 cm-1. The peaks correspond to the presence of a C-H vibration of the aromatic ring, stretch vibration of C-O, carbonyl groups and flavanones. SEM analyses of the synthesized AgNPs were clearly distinguishable, which measured 25-110 nm in size. It is clear that the rod and cylindrical structures have an average size of 95 nm. The EDX spectra showed the purity of the material and the complete chemical composition of the synthesized AgNPs. Parasite larvae were exposed to varying concentrations of aqueous leaf extract of O. canum and synthesized AgNPs for 24 h. The acaricidal activities of aqueous crude leaf extracts of O. canum against the larvae of H. a. anatolicum and H. m. isaaci have LC50 and LC90 values of 15.31 and 13.85 mg/L, and 62.41 and 48.86 mg/L, respectively. The efficacies of 1 mM AgNO3 solution against H. a. anatolicum and H. m. isaaci were LC50=12.25 and 12.17 mg/L, LC90=49.17 and 46.52 mg/L, respectively, and the maximum efficacy was observed in the synthesized AgNPs against H. a. anatolicum and H. m. isaaci with LC50 and LC90 values of 0.78 and 1.00 mg/L, and 1.51 and 1.68 mg/L, respectively. This method is considered as an innovative alternative approach to control parasites. © Springer-Verlag 2011.