Electrochemical and catalytic investigations of dopamine and uric acid by modified carbon nanotube paste electrode

被引：147

作者：

Mazloum-Ardakani, Mohammad ^{[1
]}

Beitollahi, Hadi ^{[1
]}

Ganjipour, Bahram ^{[2
]}

Naeimi, Hossein ^{[3
]}

Nejati, Maryam ^{[3
]}

机构：

[1] Yazd Univ, Fac Sci, Dept Chem, Yazd, Iran

[2] Univ Kashan, Inst Nanotechnol, Kashan, Iran

[3] Univ Kashan, Fac Sci, Dept Chem, Kashan, Iran

来源：

BIOELECTROCHEMISTRY | 2009年 / 75卷 / 01期

关键词：

Electrocatalytic; Dopamine; Uric acid; Carbon nanotube; Voltammetry; MODIFIED GLASSY-CARBON; ASCORBIC-ACID; AMPEROMETRIC DETERMINATION; VOLTAMMETRIC DETERMINATION; SENSITIVE DETERMINATION; MOLECULAR ELECTRONICS; SOL-GEL; FILM; ELECTROCATALYSIS; BIOSENSOR;

D O I：

10.1016/j.bioelechem.2008.11.006

中图分类号：

Q5 [生物化学]; Q7 [分子生物学];

学科分类号：

071010 ; 081704 ;

摘要：

The redox response of a modified carbon nanotube paste electrode of 2,2'-[1, 2-ethanediylbis(nitriloethylidyne)]-bis-hydroquinone was investigated. Mixture of dopamine (DA) and uric acid (UA), can be separated from one another with a potential difference of 180 mV between them at a scan rate of 25 mVs(-1) by cyclic voltammetry. These conditions are sufficient to allow determination of DA and UA both individually and simultaneously. The electrocatalytic currents increases linearly with the DA and UA concentrations in the ranges of 0.1-900 mu M and 20-650 mu M, and the detection limits for DA and UA, were 0.087 and 15 mu M. respectively. The diffusion coefficient (D/cm(2) s(-1) = 7.3 x 10(-6)) and the kinetic parameters such as the electron transfer coefficient, (alpha=0.32) and the heterogeneous rate constant, (k'/cm s(-1)=2.21 X 10(-3)) for DA were determined using electrochemical approaches. (c) 2008 Elsevier B.V. All rights reserved.

引用

页码：1 / 8

页数：8

共 43 条

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