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Type: Artigo de periódico
Title: Congo red immobilized on a silica/aniline xerogel: Preparation and application as an amperometric sensor for ascorbic acid
Author: Pavan, FA
Ribeiro, ES
Gushikem, Y
Abstract: Congo red (CR) was immobilized on a silica/aniline xerogel through electrostatic interaction. The dye is strongly retained and is not easily leached from the xerogel matrix. The material containing the adsorbed dye was used to prepare a carbon paste electrode and the electrochemical properties of the hybrid material were investigated using cyclic voltammetry and amperometry. The modified electrode was used to study the electrochemical oxidation of ascorbic acid. The adsorbed dye mediates ascorbic acid oxidation at the solid electrode surface-solution interface at an anodic potential of 0.18 V at pH 7, in a 0.5 cool L-1 KCl solution. This novel modified carbon paste electrode shows good analytical performance for the determination of ascorbic acid in commercial Vitamin C tablets.
Subject: congo red
silica/aniline xerogel
amperometric sensor
ascorbic acid
Country: Alemanha
Editor: Wiley-v C H Verlag Gmbh
Rights: fechado
Identifier DOI: 10.1002/elan.200403132
Date Issue: 2005
Appears in Collections:Artigos e Materiais de Revistas Científicas - Unicamp

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