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Tkac, J. et al.

Tkac, Vostiar, Gorton, Gemeiner, Sturdik,

Improved selectivity of microbial biosensor using membrane coating. Application to the analysis of ethanol during fermentation.

A ferricyanide mediated microbial biosensor for ethanol detection was prepared by surface modification of a glassy carbon electrode. The selectivity of the whole Gluconobacter oxydans cell biosensor for ethanol determination was greatly enhanced by the size exclusion effect of a cellulose acetate (CA) membrane. The use of a CA membrane increased the ethanol to glucose sensitivity ratio by a factor of 58.2 and even the ethanol to glycerol sensitivity ratio by a factor of 7.5 compared with the use of a dialysis membrane. The biosensor provides rapid and sensitive detection of ethanol with a limit of detection of 0.85 microM (S/N=3). The selectivity of the biosensor toward alcohols was better compared to previously published enzyme biosensors based on alcohol oxidase or alcohol dehydrogenases. The biosensor was successfully used in an off-line monitoring of ethanol during batch fermentation by immobilized Saccharomyces cerevisiae cells with an initial glucose concentration of 200 g l(-1).[1]

References

Improved selectivity of microbial biosensor using membrane coating. Application to the analysis of ethanol during fermentation. Tkac, J., Vostiar, I., Gorton, L., Gemeiner, P., Sturdik, E. Biosensors & bioelectronics. (2003) [Pubmed]

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