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Sensors 2012, 12(3), 3562-3577; doi:10.3390/s120303562

Electrochemical Oxidation of Cysteine at a Film Gold Modified Carbon Fiber Microelectrode Its Application in a Flow—Through Voltammetric Sensor

Department of Medical Chemistry, Chia Nan University of Pharmacy and Science, 60 Erh-Jen Road, Section 1, Jen Te, Tainan 71743, Taiwan
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Received: 22 February 2012 / Revised: 6 March 2012 / Accepted: 12 March 2012 / Published: 14 March 2012
(This article belongs to the Section Chemical Sensors)
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Abstract

A flow-electrolytical cell containing a strand of micro Au modified carbon fiber electrodes (CFE) has been designedand characterized for use in a voltammatric detector for detecting cysteine using high-performance liquid chromatography. Cysteine is more efficiently electrochemical oxidized on a Au /CFE than a bare gold and carbon fiber electrode. The possible reaction mechanism of the oxidation process is described from the relations to scan rate, peak potentials and currents. For the pulse mode, and measurements with suitable experimental parameters, a linear concentration from 0.5 to 5.0 mg·L−1 was found. The limit of quantification for cysteine was below 60 ng·mL−1. View Full-Text
Keywords: micro Au-modified carbon fiber electrode; pulse amperometric detection; cysteine micro Au-modified carbon fiber electrode; pulse amperometric detection; cysteine
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Wang, L.-H.; Huang, W.-S. Electrochemical Oxidation of Cysteine at a Film Gold Modified Carbon Fiber Microelectrode Its Application in a Flow—Through Voltammetric Sensor. Sensors 2012, 12, 3562-3577.

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