Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/343156
Type: Artigo
Title: An electrochemical sensor based on graphite electrode modified with silica containing 1-n-propyl-3-methylimidazolium species for determination of ascorbic acid
Author: Tkachenko, Anastasiya B.
Onizhuk, Mykyta O.
Tkachenko, Oleg S.
Arenas, Leliz T.
Benvenutti, Edilson, V.
Gushikem, Yoshitaka
Panteleimonov, Anton V.
Abstract: In the present study, an electrochemical sensor based on the electrode (SiMImCl/C) consisting of graphite and silica, grafted with 1-n-propyl-3-methylimidazolium chloride was used for ascorbic acid (AA) quantification in pharmaceuticals and food formulations. Cyclic voltammetry and electrochemical impedance spectroscopy were applied for electrochemical characterization of the SiMImCl/C electrode. The cyclic voltammetry study revealed that the oxidation of AA on this electrode is an irreversible process, realized by adsorption and diffusion limited step. The differential pulse voltammetry was applied to develop a procedure for the AA determination. The linear range was found to be 0.3-170 mu mol L-1 and the limit of detection - 0.1 mu mol L-1. The proposed SiMImCl/C electrode has long term stability and does not show electrochemical activity towards the analytes, which commonly coexist with AA. The sensor was successfully used for quantification of AA in food and pharmaceutical formulations
Subject: Sensor
Country: Ucrânia
Editor: Taras Shevchenko National University
Rights: Fechado
Identifier DOI: 10.17721/moca.2019.5-14
Address: http://www.moca.net.ua/en/19/14_1_1m.html
Date Issue: 2019
Appears in Collections:IQ - Artigos e Outros Documentos

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