Electrochemical behavior of ascorbic acid and rutin on poly(L-arginine)-graphene oxide modified electrode

Abstract

<span style="mso-bidi-font-size:12.0pt" lang="EN-GB">The electrochemical behavior of ascorbic acid and rutin using a poly(L-arginine)-graphene oxide modified glassy carbon electrode (PLA-GO/GCE) has been studied by cyclic voltammetry and chronoamperometry. The modified electrode succeeds in distinguishing the electrochemical responses of ascorbic acid and rutin in a mixture solution due to its high electron transfer rate and good catalytic ability. The number of electrons involved in the reaction of ascorbic acid and rutin are calculated to be 1.994 and 1.968, respectively. The redox reaction of rutin is mainly an adsorption controlled process and the oxidation of ascorbic acid is a diffusion controlled process in <i>p</i>H 2.0 phosphate buffer. The diffusion coefficient of ascorbic acid is found to be 3.003×10^-6 cm² s^-1.

In the case of rutin, the surface coverage concentration is 6.17×10^-9 mol cm^-2, and the electron transfer coefficient is 0.51, while the rate constant of electrode reaction is 0.967 s^-1. The PLA-GO/GCE electrode is of high sensitivity and selectivity, and has been successfully applied for simultaneous determination of ascorbic acid and rutin.

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