Bacillus stearothermophilus for thermophilic production of l-lactic acid |
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Authors: | Danner H. Neureiter M. Madzingaidzo L. Gartner M. Braun R. |
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Affiliation: | (1) Department for Environmental Biotechnology, Institute for Agrobiotechnology Tulln (IFA-Tulln), Konrad Lorenz Str. 20, A-3430 Tulln, Austria |
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Abstract: | A process for the continuous production of high purityL-lactic acid in a membrane bioreactor at 65°C has been developed. Two differentBacillus stearothermophilus strains have been tested in batch experiments. Lactic acid yields are between 60 and more than 95% of theoretical yields. The amounts of ethanol, acetate, and formate formed varied between 0 and 0.4, 0 and 0.1, and 0 and 0.5, respectively (mol/mol glucose). All byproducts are valuable and may be separated easily by rectification of the fermentation broth. Complete cell retention enables high volumetric productivity (5 g/Lh), and a minimum of growth supplements. The high temperature of 65°C allows the autoselective fermentation without problems with contamination. |
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Keywords: | KeywordHeading" >Index Entries Bacillus stearothermophilus font-variant:small-caps" >L-lactic acid thermophilic continuous fermentation |
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