Electrochemical self-assembly of nordihydroguaiaretic acid/Nafion modified electrodes and their electrocatalytic properties for catecholamines and ascorbic acid

被引：34

作者：

Chen, SM ^{[1
]}

Liu, MI ^{[1
]}

机构：

[1] Natl Taipei Univ Technol, Dept Chem Engn, Taipei 106, Taiwan

来源：

JOURNAL OF ELECTROANALYTICAL CHEMISTRY | 2005年 / 579卷 / 01期

关键词：

film modified electrode; nordihydroguaiaretic acid; Nafion; catecholamines; ascorbic acid;

D O I：

10.1016/j.jelechem.2005.02.005

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

Electrochemically active 1,4-bis(3,4-dihydroxyphenyl)-2,3-dimethylbutane (nordihydroguaiaretic acid, NDGA) films can be directly deposited on Nafion modified electrodes from aqueous nordihydroguaiaretic acid. The deposited NDGA/Nafion films are stable, and show obvious electrochemical activity in aqueous solutions with various pH. An electrochemical quartz crystal microbalance and cyclic voltammetry were used to study the in situ growth of the NDGA/Nafion films. When freshly prepared NDGA/Nafion films were transferred to aqueous solutions at various pH, the formal potential was found to be pH dependent. The NDGA/Nafion films electrocatalytically oxidized dopamine, epinephrine, and norepinephrine in aqueous solutions, with the electrocatalytic oxidation current developing through the oxidized form of the NDGA/Nafion film. NDGA/Nafion films also showed reversible electrocatalytic properties. Such films electrocatalytically reduce the oxidation products of dopamine, epinephrine, and norepinephrine resulting from the electrocatalytic oxidation of these compounds by the NDGA/Nafion film. The NDGA/Nafion modified films also electrocatalytically oxidized a mixture of dopamine and ascorbic acid. The chemical reaction of dopamine quinone with ascorbic acid was investigated using the rotating ring-disk electrode method. (c) 2005 Elsevier B.V. All rights reserved.

引用

页码：153 / 162

页数：10

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