Simple electrochemical sensor for caffeine based on carbon and Nafion-modified carbon electrodes

被引：88

作者：

Carolina Torres, A. ^{[1
]}

Barsan, Madalina M. ^{[1
]}

Brett, Christopher M. A. ^{[1
]}

机构：

[1] Univ Coimbra, Fac Ciencias & Tecnol, Dept Quim, P-3004535 Coimbra, Portugal

来源：

FOOD CHEMISTRY | 2014年 / 149卷

关键词：

Caffeine; Glassy carbon; Nafion coating; Modified electrodes; Food analysis; VOLTAMMETRIC DETERMINATION; SENSITIVE DETERMINATION; THEOPHYLLINE; THEOBROMINE; NANOTUBES; COFFEE;

D O I：

10.1016/j.foodchem.2013.10.114

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

A simple, economic, highly sensitive and highly selective method for the detection of caffeine has been developed at bare and Nafion-modified glassy carbon electrodes (GCE). The electrochemical behaviour of caffeine was examined in electrolyte solutions of phosphate buffer saline, sodium perchlorate, and in choline chloride plus oxalic acid, using analytical determinations by fixed potential amperometry, phosphate buffer saline being the best. Modifications of the GCE surface with poly(3,4-ethylenedioxythiophene) (PEDOT), Nation, and multi-walled carbon nanotubes were tested in order to evaluate possible sensor performance enhancements, Nation giving the most satisfactory results. The effect of interfering compounds usually found in samples containing caffeine was examined at GCE without and with Nafion coating, to exclude interferences, and the sensors were successfully applied to determine the caffeine content in commercial beverages and drugs. (C) 2013 Elsevier Ltd. All rights reserved.

引用

页码：215 / 220

页数：6

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