TY - JOUR ID - 16483 TI - Sensitive Electrochemical Determination of Gallic Acid: Application in Estimation of Total Polyphenols in Plant Samples JO - Analytical and Bioanalytical Chemistry Research JA - ABCR LA - en SN - AU - Sheikh-Mohseni, Mohammad Ali AD - Shahid Bakeri High Education Center of Miandoab, Urmia University, Urmia, I.R. Iran Y1 - 2016 PY - 2016 VL - 3 IS - 2 SP - 217 EP - 224 KW - Gallic acid KW - Graphene nano-sheets KW - Voltammetry KW - polyphenols KW - Plant samples DO - 10.22036/abcr.2016.16483 N2 - A modified electrode was prepared by modification of the carbon paste electrode (CPE) with graphene nano-sheets. The fabricated modified electrode exhibited an electrocatalytic activity toward gallic acid (GA) oxidation because of good conductivity, low electron transfer resistance and catalytic effect. The graphene modified CPE had a lower overvoltage and enhanced electrical current respect to the bare CPE for the oxidation of GA. The oxidation potential of GA decreased more than 210 mV by the modified electrode. The modified electrode responded to the GA in the concentration range of 3.0 × 10-5-1.5 × 10-4 M with high sensitivity by the technique of differential pulse voltammetry. Also, detection limit of 1.1 × 10-7 M was obtained by this modified electrode for GA. This electrode was used for the successful determination of GA in plant samples. Therefore, the content of total polyphenols in plant samples can be determined by the proposed modified electrode based on the concentration of GA in the sample. UR - https://www.analchemres.org/article_16483.html L1 - https://www.analchemres.org/article_16483_861805d6f8bb1eb6b3642b8a71a88514.pdf ER -