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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Danner, H., Neureiter, M., Madzingaidzo, L. et al. Bacillus stearothermophilus for thermophilic production of l-lactic acid. Appl Biochem Biotechnol 70, 895–903 (1998). https://doi.org/10.1007/BF02920200
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DOI: https://doi.org/10.1007/BF02920200