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Sensors 2008, 8(3), 1950-1959; doi:10.3390/s8031950
Article

Electrooxidation and Determination of Dopamine Using a Nafion®-Cobalt Hexacyanoferrate Film Modified Electrode

1, 2, 3 and 4,*
1 UERN - FANAT - Departmento de Química, 59600-010 – Mossoró, RN, Brazil 2 Loughborough University - Department of Chemistry, Loughborough, LE11 3TU, UK 3 USP – Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto- Departamento de Química, 14040-901 – Ribeirão Preto, SP, Brazil 4 UNESP – Instituto de Química- Departamento de Química Analítica, 14800-900 – Araraquara, SP, Brazil
* Author to whom correspondence should be addressed.
Received: 29 May 2007 / Accepted: 17 March 2008 / Published: 19 March 2008
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Abstract

The electrocatalysis of dopamine has been studied using a cobalt hexacyanoferrate film (CoHCFe)-modified glassy carbon electrode. Using a rotating disk CoHCFe-modified electrode, the reaction rate constant for dopamine was found to be 3.5 × 105 cm3 mol-1 s-1 at a concentration of 5.0 × 10-5 mol L-1. When a Nafion® film is applied to the CoHCFe-modified electrode surface a high selectivity for the determination of dopamine over ascorbic acid was obtained. The analytical curve for dopamine presented linear dependence over the concentration range from 1.2 × 10-5 to 5.0 × 10-4 mol L-1 with a slope of 23.5 mA mol-1 L and a linear correlation coefficient of 0.999. The detection limit of this method was 8.9 × 10-6 mol L-1 and the relative standard deviation for five measurements of 2.5 × 10-4 mol L-1 dopamine was 0.58%.
Keywords: Cobalt hexacyanoferrate; chemically modified electrode; dopamine; voltammetry; rotating disk electrode. Cobalt hexacyanoferrate; chemically modified electrode; dopamine; voltammetry; rotating disk electrode.
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).
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Castro, S.S.L.; Mortimer, R.J.; De Oliveira, M.F.; Stradiotto, N.R. Electrooxidation and Determination of Dopamine Using a Nafion®-Cobalt Hexacyanoferrate Film Modified Electrode. Sensors 2008, 8, 1950-1959.

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