Electrochemical Studies of L-Cysteine

摘要

The electrochemical behavior of L-cysteine has been studied at platinum, gold, and glassy carbon in various media. In 0.10 M KNO3, L-cysteine undergoes a one-electron oxidation at platinum to form cystine. At gold in pH 7.4 phosphate buffer, evidence has been obtained for an abrupt change in surface structure as L-cysteine is added. Addition of L-cysteine to ZnSO_4 in 0.10M KNO_3 has a dramatic impact on both Zn deposition / stripping and the L-cysteine electrochemistry. The electrochemical behavior of L-cysteine in formamide has been found to be somewhat similar to that in aqueous solutions.