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Electrochemical Comparative Study of Riboflavin, FMN and FAD Immobilized on the Silica Gel Modified with Zirconium Oxide

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Author(s): Yamashita Miyuki | Rosatto Simone S. | Kubota Lauro T.

Journal: Journal of the Brazilian Chemical Society
ISSN 0103-5053

Volume: 13;
Issue: 5;
Start page: 635;
Date: 2002;
Original page

Keywords: flavin | carbon paste electrode | silica gel | zirconium oxide

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, Eº, 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 Eº values remained pH dependent with certain invariance for riboflavin between 4 and 5. The composition of the supporting electrolyte did not affect the Eº 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.
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