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Journal of Advances in Chemistry
Number of Followers: 8  

  This is an Open Access Journal Open Access journal
ISSN (Print) 2321-807X
Published by CIRWORLD Homepage  [11 journals]
  • Optimization of 6-Gingerol Extraction Assisted by Microwave From Fresh
           Ginger Using Response Surface Methodology

    • Authors: Vedashree M, Madeneni Madhava Naidu
      Pages: 6173 - 6185
      Abstract: The present study investigates optimum conditions for Microwave assisted extraction (MAE) of 6-gingerol. Ginger was dried using a cross flow dryer at 55 ± 2 0C for eight hours. Ginger powder was extracted at three different watts (400 W, 500 W, and 600 W), temperatures (50 0C, 60 0C, 70 0C) and time (10, 20, 30 min) for optimum yield.  6-gingerol content was found to be 21.15 ± 0.13 and 18.81 ± 0.15 mg/g in fresh ginger and dried ginger, respectively.  Optimized condition obtained by RSM for 6-gingerol was 400 W, 70 0C at 10 min extraction time.  The results of MAE are expressed by 2-D contour plot and response surface curve by keeping one variable constant which showed highest yield at 600 W, 70 0C for 30 min extraction time.  Microwave assisted extracts exhibited higher antioxidant activity in comparison with conventional extracts.
      PubDate: 2018-05-30
      DOI: 10.24297/jac.v15i2.7357
      Issue No: Vol. 15, No. 2 (2018)
  • Direct Spectrophotometric Determination of Glimepiride in Pure Form And
           Pharmaceutical Formulations Using Bromocresol Purple

    • Authors: Abdul Aziz Ramadan, Souad Zeino
      Pages: 6186 - 6198
      Abstract: A simple, direct and accurate spectrophotometric method has been developed for the determination of Glimepiride (GLM) in pure and pharmaceutical formulations by complex formation with bromocresol purple (BCP). The method involves the formation of a yellow ion-pair complex between BCP with glimepiride at pH<3,8; after reacting GLM with Na2CO3 to give C24H33N4H+O5NaS which is extracted by chloroform. The formed complex [GLM]:[ BCP] was measured at lmax 418 nm against the reagent blank prepared in the same manner. Variables were studied in order to optimize the reaction conditions. Molar absorptivity (e) for complex was  20600 Beer’s law was obeyed in the concentration range of  1.226 – 46.608   mg.mL-1 in present of 5.0x10-4 mol/l of BCP with good correlation coefficient (R2= 0.9997). The relative standard deviation did not exceed 3.6%. The limit of detection (LOD) and the limit of quantification (LOQ) were 0.15 and 0.46 mg.mL-1, respectively. The proposed method was validated for specificity, linearity, precision and accuracy, repeatability, sensitivity (LOD and LOQ)  and robustness. The developed method is applicable for the determination of GLM in  pure and different dosage forms with average assay of 98.8 to 102.0% and the results are in good agreement with those obtained by the  RP-HPLC reference method.  
      PubDate: 2018-07-04
      DOI: 10.24297/jac.v15i2.7454
      Issue No: Vol. 15, No. 2 (2018)
  • The Electrodeposition rhenium-tellurium alloys from chlorides asides

    • Authors: Elza Salakhova, D. B. Tagiyev, P. E. Kalantarova, A. M. Asgarova
      Pages: 6199 - 6206
      Abstract: There has been investigated the joint electrodeposition of rhenium with tellur from chlorides electrolyte, by measuring the cycling volt-ampere curves there has been determined the field of potentials, at the presence of which the joint electrodeposition of rhenium with sulphur takes place. It has been shown, that the joint deposition of rhenium with tellur goes with a certain depolarization, besides, the depolarization is caused by the energy emanating along formation of ReTe2 compounds. There was studied the influence of current density, temperature and acidity on the composition and quality of cathode sediments. It was established, that with the rise of current density and the temperature of electrolyte the concentration of rhenium in the alloy increases.
      PubDate: 2018-07-04
      DOI: 10.24297/jac.v15i2.7457
      Issue No: Vol. 15, No. 2 (2018)
School of Mathematical and Computer Sciences
Heriot-Watt University
Edinburgh, EH14 4AS, UK
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