蛋氨酸在长链硫醇修饰电极上的电化学行为研究

Electrochemical Properties of DL-Methoinine on the Long-chain Alkanethiol Self-Assembled Monolayer Derivatized Gold Electrodes

研究了蛋氨酸（ＤＬ－Ｍｅｔ）在ＨＳ（ＣＨ）１１ＮＨ２，ＨＳ（ＣＨ２）１１ＣＯＯＨ，ＨＳ（ＣＨ２）１１ＯＨ，ＨＳ（ＣＨ２）１１ＣＨ３４种不同末端官能团长链硫醇修饰电极上的电化学行为，结果表明ＤＬ－Ｍｅｔ不仅可以渗透自组单分子层膜（ＳＡＭｓ），而且ＤＬ－Ｍｅｔ在不同末端官能团的ＳＡＭｓ上的渗透速率不同．另外，本文还研究了ＤＬ－Ｍｅｔ在金电极上的电化学反应机理，结果表明ＤＬ－Ｍｅｔ的电化学氧化是快速的、不可逆的单电子转移反应，ＤＬ－Ｍｅｔ在金电极上的阳极氧化反应的速率常数、传递系数、最大吸附量等都被测得．

The electrochemical properties of DL-Methoinine have been investigated on the long-chain alkanethiol self-assembled monolayer(SAM) derivatized gold electrodes. The alkanethiols used were HS(CH 2) 11 NH 2, HS(CH 2) 11 COOH, HS(CH 2) 11 OH, HS(CH 2) 11 CH 3, respectively. It is indicated that DL Met can permeate into the monolayer assemblies, and its permeation rate is influenced by the electrostatic interaction between the charged DL Met and the charged surface of the monolayer assemblies. The mechanism of anodic oxidation of DL Met on a bare gold electrode was also studied, and some electrochemical parameters of DL Met were obtained.