Meldola's blue immobilized on a SiO2/SnO2/Phosphate xerogel, a new sensor for determination of ascorbic acid in medicine and commercial fruit juice

被引：10

作者：

de Castilho, Rodrigo Ferrari ^{[1
]}

Ribeiro de Souza, Eloana Benassi ^{[1
]}

da Silva Alfaya, Reni Ventura ^{[1
]}

da Silva Alfaya, Antonio Alberto ^{[1
]}

机构：

[1] Univ Estadual Londrina, Dept Quim, BR-86051990 Londrina, PR, Brazil

来源：

ELECTROANALYSIS | 2008年 / 20卷 / 02期

关键词：

Meldola's blue; SiO2/SnO2/Phosphate xerogel; sol-gel process; amperometric sensor; ascorbic acid;

D O I：

10.1002/elan.200704029

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

A modified carbon paste electrode with SiO2/SnO2/Phosphate/Meldol a's blue, SSPMelB, was used to study the electrocatalytic oxidation of ascorbic acid by cyclic vottammetry and chronoamperometry. The adsorbed dye mediates ascorbic acid oxidation at an anodic potential of 0.04 V vs. saturated calomel electrode (SCE) at pH 7.0, in 0.5 mol L-1 solution. The linear range of the sensor is between 4.0 x 10(-7) and 2.0 x 10(-3) mol L-1, with a limit of detection of 4.0 x 10(-7) mol L-1. This novel electrode shows good analytical performance for determination of ascorbic acid in medicine and commercial fruit juice.

引用

页码：157 / 162

页数：6

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