A comparison of the electrochemical and electroanalytical behavior of ascorbic acid, dopamine and uric acid at bare, activated and multi-wall carbon nanotubes modified glassy carbon electrodes

被引:1
作者
H. R. Zare
N. Nasirizadeh
机构
[1] Yazd University,Department of Chemistry
来源
Journal of the Iranian Chemical Society | 2011年 / 8卷
关键词
Multi-wall carbon nanotubes; Mediator; Promoter; Ascorbic acid; Dopamine; Uric acid;
D O I
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中图分类号
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摘要
The electrochemical oxidation of ascorbic acid (AA), dopamine (DA) and uric acid (UA), as three important biological molecules, have been studied at the bare, activated and multi-wall carbon nanotubes modified glassy carbon electrodes (MWCNTGCE) using different voltammetric methods. MWCNT-GCE not only exhibited both the roles of mediator and promoter for AA oxidation, but also performed the role of an excellent promoter for electrochemical oxidation of DA and UA when compared with bare GCE (BGCE) or activated GCE (AGCE). The results show that the oxidation of AA at MWCNT-GCE exhibits the characteristic shape typical of an EC catalytic (ErCi'anism. In differential pulse voltammetric measurements, MWCNTGCE and AGCE could separate the oxidation peak potentials of AA, DA and UA present in the same solution, though the MWCNT-GCE remarkably improves the sensitivity of determination of the analytes and also reduces the fouling effects as compared to AGCE. Furthermore, the hydrodynamic amperometry at rotating MWCNT-GCE at constant potential was used for determination of AA, DA and UA individually in the presence of the other two species. It has been shown that using MWCNTGCE, these three species can be determined by amperometry with high sensitivity and selectivity. Finally, MWCNT-GCE has been applied to simultaneous determination of AA and DA in the related injection solutions and UA in a human urine sample with satisfactory results.
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页码:S55 / S66
相关论文
共 222 条
[1]  
Iijima S.(1991)undefined Journal of the Iranian Chemical Society 354 56-undefined
[2]  
Iijima S.(1993)undefined Journal of the Iranian Chemical Society 363 603-undefined
[3]  
Ichihashi T.(2005)undefined Journal of the Iranian Chemical Society 50 3049-undefined
[4]  
Gooding J.J.(1996)undefined Journal of the Iranian Chemical Society 41 121-undefined
[5]  
Britto P.J.(2009)undefined Journal of the Iranian Chemical Society 21 1811-undefined
[6]  
Santhanam K.S.V.(2001)undefined Journal of the Iranian Chemical Society 55 855-undefined
[7]  
Ajayan P.M.(2008)undefined Journal of the Iranian Chemical Society 24 518-undefined
[8]  
Jiang L.C.(2002)undefined Journal of the Iranian Chemical Society 73 325-undefined
[9]  
Zhang W.D.(2003)undefined Journal of the Iranian Chemical Society 791 217-undefined
[10]  
Munoz R.A.A.(2003)undefined Journal of the Iranian Chemical Society 75 2075-undefined