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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,*
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 which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

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.

AMA Style

Castro SSL, Mortimer RJ, De Oliveira MF, Stradiotto NR. Electrooxidation and Determination of Dopamine Using a Nafion®-Cobalt Hexacyanoferrate Film Modified Electrode. Sensors. 2008; 8(3):1950-1959.

Chicago/Turabian Style

Castro, Suely S.L.; Mortimer, Roger J.; De Oliveira, Marcelo F.; Stradiotto, Nelson R. 2008. "Electrooxidation and Determination of Dopamine Using a Nafion®-Cobalt Hexacyanoferrate Film Modified Electrode." Sensors 8, no. 3: 1950-1959.



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