Abstract
Bioelectrocatalytic oxidation of ethanol by whole cells and membrane fraction of Gluconobacteroxydans bacteria is studied on modified graphite-paste electrodes in mediator biosensors. Ferrocene derivatives are used as electron transport mediators for effective coupling of enzymatic and electrochemical processes on graphite electrodes. Electrochemical kinetics of the processes are studied; the obtained data are interpreted in the terms of the mechanism of two-substrate enzymatic reaction. It is shown that mediators of ferrocene series are promising compounds for development of mediator biosensors based both on whole cells of Gluconobacter oxydans bacteria and on membrane fractions of these bacteria. Bioelectrocatalytic processes of ethanol oxidation on graphite paste electrodes occur more efficiently when the bacterial membrane fraction is used as a biocatalyst and ferrocenemonocarboxylic acid is used as a mediator.
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