Amperometric ascorbate sensor based on conducting polymer:: Poly(N-methylaniline) versus polyaniline

被引：34

作者：

Brazdziuvien, K. ^{[1
]}

Jureviciute, I. ^{[1
]}

Malinauskas, A. ^{[1
]}

机构：

[1] Inst Chem, LT-01108 Vilnius, Lithuania

来源：

ELECTROCHIMICA ACTA | 2007年 / 53卷 / 02期

关键词：

ascorbate sensor; electrocatalysis; polyaniline; poly(N-methylaniline); electroanalysis;

D O I：

10.1016/j.electacta.2007.07.054

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Electrocatalytic oxidation of ascorbate (vitamin C) at poly (N-methyl aniline) modified electrode has been studied and compared with that proceeding at polyaniline modified sensor. A sigmoid-shaped anodic current transient as a response to addition of ascorbate was found for polyaniline modified electrode in pH-neutral solution, whereas a 'normal-shaped' current transient was found to be characteristic for poly(N-methylaniline) modified electrode. Based on this, a hypothesis on the autocatalytic mechanism for electrochemical oxidation of ascorbate was confirmed. It has been shown that poly(N-methlaniline) modified electrode can be used as an amperometric ascorbate sensor, operating in slightly acidic or pH-neutral buffer solutions at a controlled potential of 0.1-0.5 V versus Ag/AgCl, and the dependencies of current response on ascorbate concentration, the thickness of a polymer layer, and operating potential have been analyzed. (c) 2007 Elsevier Ltd. All rights reserved.

引用

页码：785 / 791

页数：7

共 27 条

[1] Non-spectrophotometric methods for the determination of Vitamin C [J].