A Study on Adsorption of Electrogenerated Cystine Precipitate onto An Electrode using Electrochemical Quartz Crystal Impedance System

作     者：You Yu ZHANG Qing Ji XIE Yang Hui GUO Xiang Jun WANG Shou Zhuo YAO(Chemical Research Institute. Hunan Normal University, Changsha 410081) 

出 版 物：《Chinese Chemical Letters》 (中国化学快报（英文版）)

年 卷 期：1999年第10卷第12期

页      面：0-0,0-0页

核心收录：

学科分类：081704[工学-应用化学] 07[理学] 08[工学] 0817[工学-化学工程与技术] 070303[理学-有机化学] 0703[理学-化学] 

主　　题：Electrochemical quartz crystal impedance system adsorption of electrogeneratedprecipitate. cystine/cysteine Fe(CN)_6 3-/Fe(CN)_6,4-. 

摘      要：An electrochemical quartz crystal impedance system has been applied to monitorgeneration of precipitate and adsorption of the precipitate onto An electrode during electrochmicaloxidation and Fe(CN)_6,3-/Fe(CN),6 4- electrochemical catalytic oxidation of L-cysteine in phosphateaqueous buffer (pH 7.4). Significant decreases in the resonant frequency and increases in themotional resistance and the static capacitance were found during the precipitate adsorption, and thefrequency shift found in solution was ca. 2 times that in air. Similar responses of quartz crystalimpedance and a white precipitate were obtained during redox titration of L-cysteine solutionusing K_3Fe(CN)_6 solution. FT-IR analysis indicated that the white precipitate is cystine. Theelectrode collection efficiency of the electrogenerated cystine was estimated.