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Title: Simple electrochemical sensor for caffeine based on carbon and Nafion-modified carbon electrodes
Authors: Torres, A. Carolina 
Barsan, Madalina M. 
Brett, Christopher M. A. 
Keywords: Caffeine; Glassy carbon; Nafion coating; Modified electrodes; Food analysis
Issue Date: 15-Apr-2014
Publisher: Elsevier
Citation: TORRES, A. Carolina; BARSAN, Madalina M.; BRETT, Christopher M. A. - Simple electrochemical sensor for caffeine based on carbon and Nafion-modified carbon electrodes. "Food Chemistry". ISSN 0308-8146. Vol. 149 (2014) p. 215-220
Serial title, monograph or event: Food Chemistry
Volume: 149
Abstract: 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), Nafion, and multi-walled carbon nanotubes were tested in order to evaluate possible sensor performance enhancements, Nafion 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.
ISSN: 0308-8146
DOI: 10.1016/j.foodchem.2013.10.114
Rights: openAccess
Appears in Collections:FCTUC Química - Artigos em Revistas Internacionais

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