Voltammetric behavior of L-cysteine in the presence of CPB at a silver electrode.
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.
Zeng
B
B
Department of Chemistry, Wuhan University, Wuhan 430072, P.R. China.
Zhao
F
F
D015097:3-Mercaptopropionic Acid; D002594:Cetylpyridinium; D003543:Cysteamine / Q000737:chemistry; D003545:Cysteine / Q000737:chemistry*; D004563:Electrochemistry / Q000379:methods*; D004566:Electrodes; D006710:Homocysteine / Q000737:chemistry; D012834:Silver; D013501:Surface-Active Agents
D013501:Surface-Active Agents; D006710:Homocysteine; D012834:Silver; D003543:Cysteamine; D015097:3-Mercaptopropionic Acid; D002594:Cetylpyridinium; D003545:Cysteine