Abstract
The voltammetric behavior of L-cysteine at a silver electrode is described. L-Cysteine can be anodically accumulated at a silver electrode surface as a sparingly soluble silver salt; at more negative potentials, the insoluble compound is stripped cathodically yielding a small current peak at about –1.10 V (vs. SCE). In the presence of cetyl pyridine bromide (CPB), the stripping peak shifts slightly to a more negative potential, and the peak height increases significantly. Thus, the peak becomes more useful for the determination of L-cysteine. In contrast to other surfactants, CPB can improve the accumulation and stripping of L-cysteine obviously. The voltammetric behavior of cysteamine, 3-mercaptopropionic acid and homocysteine is discussed as well.
Similar content being viewed by others
Author information
Authors and Affiliations
Additional information
Received: 19 June 2000 / Revised: 1 November 2000 / Accepted: 4 November 2000
Rights and permissions
About this article
Cite this article
Zeng, B., Zhao, F. Voltammetric behavior of L-cysteine in the presence of CPB at a silver electrode. Fresenius J Anal Chem 369, 433–437 (2001). https://doi.org/10.1007/s002160000651
Issue Date:
DOI: https://doi.org/10.1007/s002160000651