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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 (CC BY 3.0).

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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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