Abstract
A robust microbial biosensor was constructed from a bionanocomposite prepared by a direct mixing of bacterial cells of Gluconobacter oxydans and carbon nanotubes with ferricyanide employed as a mediator for enhanced sensitivity of ethanol oxidation. A successful integration of the device into flow injection analysis mode of operation provided a high sensitivity of detection of (74 ± 2.7) μA mM−1 cm−2, a low detection limit of 5 μM and a linear range from 10 μM up to 1 mM. A short response time of the biosensor allowed a sample throughput of 67 h−1 at 0.3 ml min−1. The biosensor exhibited high operational stability with a decrease in the biosensor response of 1.7% during 43 h of continuous operation. The device was used to analyse ethanol in fermentation samples with a good agreement with a HPLC method.
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Acknowledgments
The financial support from SAV-FM-EHP-2008-04-04 and from VEGA 2/0127/10 was acknowledged. This contribution/publication was the result of the project implementation: Centre for materials, layers and systems for applications and chemical processes under extreme conditions—stage II, supported by the Research and Development Operational Program funded by the ERDF.
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Šefčovičová, J., Filip, J., Mastihuba, V. et al. Analysis of ethanol in fermentation samples by a robust nanocomposite-based microbial biosensor. Biotechnol Lett 34, 1033–1039 (2012). https://doi.org/10.1007/s10529-012-0875-x
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DOI: https://doi.org/10.1007/s10529-012-0875-x