Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/65155
Type: Artigo de periódico
Title: Electrochemical comparative study of riboflavin, FMN and FAD immobilized on the silica gel modified with zirconium oxide
Author: Yamashita, M
Rosatto, SS
Kubota, LT
Abstract: Modified carbon paste electrodes were prepared by the adsorption of flavin on a silica gel modified with zirconium oxide ( Si: Zr: flavin). The electrochemical behavior of immobilized riboflavin, FMN and FAD was investigated. The formal potentials, E-o',for the flavins in these electrodes were found to be - 0.46 V vs. SCE, this being similar to their values obtained in solution. Their E-o' values remained pH dependent with certain invariance for riboflavin between 4 and 5. The composition of the supporting electrolyte did not affect the E-o' with exception of Ca2+, but in buffer systems and especially in phosphate a good rate of electron transfer was observed. The differences verified in the electrochemical behavior and UV-visible absorption spectra among the immobilized flavins are discussed in terms of different kinds of interaction.
Subject: flavin
carbon paste electrode
silica gel
zirconium oxide
Country: Brasil
Editor: Soc Brasileira Quimica
Rights: aberto
Identifier DOI: 10.1590/S0103-50532002000500015
Date Issue: 2002
Appears in Collections:Unicamp - Artigos e Outros Documentos

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