A strategy for the determination of dopamine at a bare glassy carbon electrode:: p-Phenylenediamine as a nucleophile

被引：61

作者：

Ke, Nei Jin ^{[1
]}

Lu, Shao-Sheng ^{[1
]}

Cheng, Shu-Hua ^{[1
]}

机构：

[1] Natl Chi Nan Univ, Dept Appl Chem, Puli 545, Nantou Hsien, Taiwan

来源：

ELECTROCHEMISTRY COMMUNICATIONS | 2006年 / 8卷 / 09期

关键词：

dopamine; p-phenylenediamine; electrochemical oxidation; 1,4-Michael addition; selective sensing; electrochemical determination;

D O I：

10.1016/j.elecom.2006.07.007

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Electrochemical oxidation of dopamine (DA) in the presence of p-phenylenediamine (PPD) as a nucleophile in aqueous buffered solutions was studied. The results indicate that the o-dopaminoquinone (o-DQ) electrochemically derived from DA participates in 1,4-Michael addition with PPD to form the corresponding new derivative (P2), which is present as the oxidized state (Q2) at the electrolysis applied potential. This reaction pathway inhibits the cyclization of o-DQ and thus, the formation of polymerized films on the electrode surface. The reduction current for Q2 to P2 can be used to determine DA concentration. A selective sensing and quantitative determination of DA by adding PPD and using a bare glassy carbon electrode in the presence of a high concentration of ascorbic acid was verified. (c) 2006 Elsevier B.V. All rights reserved.

引用

页码：1514 / 1520

页数：7

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