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Simultaneous Voltammetric Determination of Gallic and Protocatechuic Acids in Mango Juice Using a Reduced Graphene Oxide-Based Electrochemical Sensor

1
Unit of Electrochemistry Applications (UEA), Department of Chemistry, Faculty of Science, Sohag University, Sohag 82524, Egypt
2
SPO, INRA, Montpellier Supagro, Montpellier University, UMR 1083, F-34060 Montpellier, France
*
Author to whom correspondence should be addressed.
Beverages 2019, 5(1), 17; https://doi.org/10.3390/beverages5010017
Received: 1 October 2018 / Revised: 22 January 2019 / Accepted: 23 January 2019 / Published: 6 February 2019
(This article belongs to the Special Issue Fruit Juices: Technology, Chemistry, and Nutrition)
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Abstract

A simple and sensitive reduced graphene oxide-modified glassy carbon electrode-based electrochemical sensor was used for the concomitant determination of gallic acid (GA) and protocatechuic (PA) acid. The prepared sensor showed a significant enhancement in synergetic electro-catalytic performance towards GA and PA oxidation. A good resolution of the voltammetry peaks was obtained and a method of square wave voltammetry was developed for detection. The modified electrode was characterized by electrochemical techniques. The optimal experimental parameters were considered. GA and PA exhibited a linear increase in the peak currents with their concentrations in the range from 20 to 144 µmol·L−1 for GA and from 20 to 166 µmol·L−1 for PA, with limits of detection (S/N = 3) of 30.8 µmol·L−1 for GA and 10.2 µmol·L−1 for PA. The sensor applicability was simultaneously tested for the analytical determination of GA and PA in mango juice and exhibited a robust functionality. View Full-Text
Keywords: voltammetry; reduced graphene oxide; electrochemical sensor; phenolic acids; mango juice voltammetry; reduced graphene oxide; electrochemical sensor; phenolic acids; mango juice
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MDPI and ACS Style

Abdel-Hamid, R.; Bakr, A.; Newair, E.F.; Garcia, F. Simultaneous Voltammetric Determination of Gallic and Protocatechuic Acids in Mango Juice Using a Reduced Graphene Oxide-Based Electrochemical Sensor. Beverages 2019, 5, 17.

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