ON THE ADSORPTION AND ELECTROCHEMICAL OXIDATION OF DNA AT GLASSY-CARBON ELECTRODES

被引：134

作者：

BRETT, CMA ^{[1
]}

BRETT, AMO ^{[1
]}

SERRANO, SHP ^{[1
]}

机构：

[1] UNIV SAO PAULO,INST QUIM,BR-05508 SAO PAULO,BRAZIL

来源：

JOURNAL OF ELECTROANALYTICAL CHEMISTRY | 1994年 / 366卷 / 1-2期

关键词：

D O I：

10.1016/0022-0728(93)02994-S

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

New experimental results concerning the adsorption and anodic oxidation of DNA denatured in acid at glassy carbon electrodes using differential pulse, square wave and cyclic voltammetry, and impedance have been obtained, in the pH range 0-12 and as a function of adsorption potential and time of adsorption. The assumption up until now of a completely irreversible oxidation of guanine and adenine residues is shown not to be true. An explanation for these and previous results, based on desorption of the oxidation products and their diffusion away from the electrode surface, physically impeded for multilayer adsorption of DNA residues, is proposed. This situation corresponds to long adsorption times, as is the case here, and is corroborated by scanning electron microscopy.

引用

页码：225 / 231

页数：7

共 22 条

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