J. Tong, M. Nie, Hu-lin Li
Aug 15, 1997
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Influential Citations
18
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Journal
Journal of Electroanalytical Chemistry
Abstract
Abstract The electrochemical oxidation of l -cysteine catalyzed by 10-ethylphenothiazine at a glassy carbon electrode in 0.1 M NaClO4 ethanol + water (1:1, v/v) solution has been studied. Cystine was the oxidation product which has been verified by melting-point measurement and thin layer chromatography. The rate constant for the catalytic reaction was evaluated as (1.59 ± 0.05) × 103 M−1 s−1 by chronoamperometry. The 10-ethylphenothiazine cation radical produced by electrochemical oxidation of neutral 10-ethylphenothiazine is stable in either acidic or neutral solutions of KCl, NH4Cl and NaClO4. Experimental conditions, which maximize the current efficiency of this electrochemical oxidation, such as pH value and the concentration of the catalyst, were also investigated and discussed in this paper.