Modified electrode using multi-walled carbon nanotubes and a metallopolymer for amperometric detection of L-cysteine

被引：26

作者：

Correa, Catia Crispilho ^{[1
,3
]}

Venturinelli Jannuzzi, Sergio Augusto ^{[2
]}

Santhiago, Murilo ^{[1
,3
]}

Timm, Ronaldo Adriano ^{[1
,3
]}

Barboza Formiga, Andre Luiz ^{[2
]}

Kubota, Lauro Tatsuo ^{[1
,3
]}

机构：

[1] Univ Estadual Campinas, Inst Chem, Dept Analyt Chem, BR-13083970 Campinas, SP, Brazil

[2] Univ Estadual Campinas, Inst Chem, Dept Inorgan Chem, BR-13083970 Campinas, SP, Brazil

[3] Univ Estadual Campinas, Natl Inst Sci & Technol Bioanalyt, BR-13083970 Campinas, SP, Brazil

来源：

ELECTROCHIMICA ACTA | 2013年 / 113卷

基金：

巴西圣保罗研究基金会;

关键词：

MWCNTs; Metallopolymer; L-Cysteine detection; Sensors; Poly(4-vinylpyridine); ELECTROCATALYTIC OXIDATION; COMPLEXES; POLY(4-VINYLPYRIDINE); NANOPARTICLES; FLUORESCENCE; COMPOSITES; PLATFORM; FILM;

D O I：

10.1016/j.electacta.2013.09.050

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

This work describes for the first time the modification of a glassy carbon electrode with a hybrid material formed by the dispersion of multi-walled carbon nanotubes in the metallopolymer P4VP-Fe(CN)5. The reversible redox couple of the material was formed at relatively low overpotential and showed a good electrocatalytic activity toward cysteine electrooxidation. The cathodic shift of the oxidation process for the modified electrode was 500 mV compared to the bare glassy carbon electrode. The rate constant (K-obs) for the chemical reaction between the redox mediator and cysteine was found to be 8.95 x 10(3) Lmol(-1) s(-1). The analytical curve was found to be linear from 20.5 up to 151 nmol L-1, with a sensitivity of 0.996 nA L nmo1(-1) and response time of 0.1 s. (C) 2013 Elsevier Ltd. All rights reserved.

引用

页码：332 / 339

页数：8

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