The electrochemical reaction mechanism of selenocystine on selenium-gold film modified glassy carbon electrode

摘要

A simple and selective voltammetric method based on selenium-gold film modified glassy carbon electrode has been developed for investigating electrochemical reaction mechanism of selenocystine. With N-2 saturated, redox reactions between selenocystine (SeC) and selenocysteine, (SeCys) were judged to be two simple electron-transfer processes. With air saturated, the reduction reaction was diagnosed to be EC catalytic reaction (the chemical oxidation reaction of the SeCys by O-2 (C) following the electron-transfer reaction (E)) and oxidation reaction is a simple electron-transfer process. With pure O-2 saturated, only reduction peak was observed and the reaction was judged to be EC catalytic reaction. The electron-transfer numbers of redox reaction were calculated to be 2 by chronocoulometry and rotating disk electrode. (c) 2006 Elsevier B.V. All rights reserved.