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Electrochemical Sensors Based on Organic Conjugated Polymers
Sensors 2008, 8(2), 594-606; doi:10.3390/s8020594
Article

Optimalization of Poly(neutral red) Coated-wire Electrode for Determination of Citrate in Soft Drinks

* , , ,  and
Department of Analytical Chemistry, Institute of Chemical Technology, Technická 5, 166 28 Prague 6 Czech Republic
* Author to whom correspondence should be addressed.
Received: 9 October 2007 / Accepted: 28 January 2008 / Published: 4 February 2008
(This article belongs to the Special Issue Electrochemical Sensors Based on Conductive Polymers)
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Abstract

This report presents an optimization of potentiometric measurements withcitrate-selective electropolymerized poly(neutral red) electrodes. The optimal backgroundelectrolyte for these measurements is a TRIS buffer with nitrate at pH 8.5. The electrodesdescribed here exhibit stable and reproducible near-Nernstian response to citrates with alow detection limit of 6 × 10-6 M. Electrodes polymerized from sulfuric acid andacetonitrile are compared in detail. Simple and sensitive method for quantification ofcitrate in real-life samples by potentiometry with poly(neutral red) electrodes arepresented. Data from potentiometric measurements of citrate are compared with capillaryelectrophoresis.
Keywords: conductive polymer; poly(neutral red); coated-wire electrode; citrate; real-life sample conductive polymer; poly(neutral red); coated-wire electrode; citrate; real-life sample
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Broncová, G.; Shishkanova, T.V.; Krondak, M.; Volf, R.; Král, V. Optimalization of Poly(neutral red) Coated-wire Electrode for Determination of Citrate in Soft Drinks. Sensors 2008, 8, 594-606.

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