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https://hdl.handle.net/10316/27131
Título: | Simple electrochemical sensor for caffeine based on carbon and Nafion-modified carbon electrodes | Autor: | Torres, A. Carolina Barsan, Madalina M. Brett, Christopher M. A. |
Palavras-chave: | Caffeine; Glassy carbon; Nafion coating; Modified electrodes; Food analysis | Data: | 15-Abr-2014 | Editora: | Elsevier | Citação: | 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 | Título da revista, periódico, livro ou evento: | Food Chemistry | Volume: | 149 | Resumo: | 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. | URI: | https://hdl.handle.net/10316/27131 | ISSN: | 0308-8146 | DOI: | 10.1016/j.foodchem.2013.10.114 | Direitos: | openAccess |
Aparece nas coleções: | FCTUC Química - Artigos em Revistas Internacionais |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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Simple electrochemical sensor for caffeine based on carbon.pdf | 460.25 kB | Adobe PDF | Ver/Abrir |
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