Electrochemical behavior Of L-cysteine and its detection at carbon nanotube electrode modified with platinum

被引：244

作者：

Fei, SD ^{[1
]}

Chen, JH ^{[1
]}

Yao, SZ ^{[1
]}

Deng, GH ^{[1
]}

He, DL ^{[1
]}

Kuang, YF ^{[1
]}

机构：

[1] Hunan Univ, Coll Chem & Chem Engn, State Key Lab Chemobiosensing & Chemometr, Changsha 410082, Peoples R China

来源：

ANALYTICAL BIOCHEMISTRY | 2005年 / 339卷 / 01期

基金：

中国国家自然科学基金;

关键词：

L-cysteine; electrocatalytic oxidation; carbon nanotubes; platinum;

D O I：

10.1016/j.ab.2005.01.002

中图分类号：

Q5 [生物化学];

学科分类号：

071010 ; 081704 ;

摘要：

The electrochemical behavior of L-Cysteine (CySH) on platinum (Pt)/carbon nanotube (CNT) electrode was investigated by cyclic voltammetry. CNTs used in this study were grown directly on graphite disk by chemical vapor deposition. Pt was electrochemically deposited on the activated CNT/graphite electrode by electroreduction of Pt(IV) complex ion on the surface of CNTs. Among graphite, CNT/graphite, and Pt/CNT electrodes, improved electrochemical behavior of CySH oxidation was found with Pt/CNT electrode. On the other hand, a sensitive CySH sensor was developed based on Pt/CNT/graphite electrode. A linear calibration curve can be observed in the range of 0.5 mu M-0.1 mM. The detection limit of the Pt/CNT electrode is 0.3 mu M (signal/nose = 3). Effects of pH, scan rate, and interference of other oxidizable amino acids were also investigated and discussed. Additionally, the reproducibility, stability, and applicability of the Pt/CNT electrode were evaluated. (c) 2005 Elsevier Inc. All rights reserved.

引用

页码：29 / 35

页数：7

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