An Electrochemical Sensor Based On Graphite Electrode Modified With Silica Containing 1-N-Propyl-3-Methylimidazolium Species For Determination Of Ascorbic Acid

IF 0.7 Q4 CHEMISTRY, ANALYTICAL

Methods and Objects of Chemical Analysis Pub Date : 2019-01-01 DOI:10.17721/MOCA.2019.5-14

A. Tkachenko, M. Onizhuk, O. Tkachenko, L. Arenas, E. Benvenutti, Y. Gushikem, A. V. Panteleimonov

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引用次数: 6

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 μmol L-1 and the limit of detection – 0.1 μmol 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.

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含1- n -丙基-3-甲基咪唑的二氧化硅修饰石墨电极电化学传感器测定抗坏血酸

本文研究了一种基于石墨和二氧化硅电极(SiMImCl/C)的电化学传感器，该电极接枝1-n-丙基-3-甲基咪唑氯，用于药物和食品配方中抗坏血酸(AA)的定量测定。采用循环伏安法和电化学阻抗法对SiMImCl/C电极进行了电化学表征。循环伏安法研究表明，AA在该电极上的氧化是一个不可逆的过程，是通过吸附和扩散限制步骤实现的。采用差分脉冲伏安法建立了测定AA的方法。线性范围为0.3 ~ 170 μmol L-1，检出限为- 0.1 μmol L-1。所提出的SiMImCl/C电极具有长期稳定性，对分析物不表现出电化学活性，通常与AA共存。该传感器已成功用于食品和药品制剂中AA的定量分析。

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来源期刊

Methods and Objects of Chemical Analysis CHEMISTRY, ANALYTICAL-

CiteScore

1.00

自引率

14.30%

发文量

期刊介绍： The journal "Methods and objects of chemical analysis" is peer-review journal and publishes original articles of theoretical and experimental analysis on topical issues and bio-analytical chemistry, chemical and pharmaceutical analysis, as well as chemical metrology. Submitted works shall cover the results of completed studies and shall make scientific contributions to the relevant area of expertise. The journal publishes review articles, research articles and articles related to latest developments of analytical instrumentations.