Abstract
Acetobacter pasteurianus LMG 1635 was studied for its potential application in the enantioselective oxidation of alcohols. Batch cultivation led to accumulation of acetic acid and loss of viability. These problems did not occur in carbon-limited chemostat cultures (dilution rate = 0.05 h−1) grown on mineral medium supplemented with ethanol, L-lactate or acetate. Nevertheless, biomass yields were extremely low in comparison to values reported for other bacteria. Cells exhibited high oxidation rates with ethanol and racemic glycidol (2,3-epoxy-1-propanol). Ethanol- and glycidol-dependent oxygen-uptake capacities of ethanol-limited cultures were higher than those of cultures grown on lactate or acetate. On all three carbon sources, A. pasteurianus expressed NAD-dependent and dye-linked ethanol dehydrogenase activity. Glycidol oxidation was strictly dye-linked. In contrast to the NAD-dependent ethanol dehydrogenase, the activity of dye-linked alcohol dehydrogenase depended on the carbon source and was highest in ethanol-grown cells. Cell suspensions from chemostat cultures could be stored at 4°C for over 30 days without significant loss of ethanol- and glycidol-oxidizing activity. It is concluded that ethanol-limited cultivation provides an attractive system for production of A. pasteurianus biomass with a high and stable alcohol-oxidizing activity.
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Salgueiro Machado, S., Luttik, M.A.H., van Dijken, J.P. et al. Regulation of alcohol-oxidizing capacity in chemostat cultures of Acetobacter pasteurianus . Appl Microbiol Biotechnol 43, 1061–1066 (1995). https://doi.org/10.1007/BF00166926
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DOI: https://doi.org/10.1007/BF00166926