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Use of dry yeast cells as a cheap nitrogen source for lactic acid production by thermophilic Bacillus coagulans WCP10-4
Received date: 24 Jul 2015
Accepted date: 04 Sep 2015
Published date: 30 Sep 2015
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Dry yeast cells (DYC) were used as a cheap nitrogen source to replace expensive yeast extract (YE) for L-lactic acid production by thermophilic Bacillus coagulans. Cassava starch (200 g·L−1) was converted to L-lactic acid by simultaneous saccharification and fermentation using Bacillus coagulans WCP10-4 at 50 °C in the presence of 20 g·L−1 of DYC, giving 148.1 g·L−1 of L-lactic acid at 27 h with a productivity of 5.5 g·L−1·h−1 and a yield of 92%. In contrast, 154.4 g·L−1 of lactic acid was produced at 24 h with a productivity of 6.4 g·L−1·h−1 and a yield of 96% when equal amount of YE was used under the same conditions. Use of pre-autolyzed DYC at 50 °C for overnight slightly improved the lactic acid titer (154.5 g·L−1) and productivity (7.7 g·L−1·h−1) but gave the same yield (96%).
Kim Yng Ooi , Jin Chuan Wu . Use of dry yeast cells as a cheap nitrogen source for lactic acid production by thermophilic Bacillus coagulans WCP10-4 [J]. Frontiers of Chemical Science and Engineering, 2015 , 9(3) : 381 -385 . DOI: 10.1007/s11705-015-1534-2
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