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l-lactic acid production by Bacillus subtilis MUR1

by: Ting Gao, Yukki Wong, Chungkei Ng, Kwokping Ho
Bioresource Technology, Vol. 121 (October 2012), pp. 105-110, doi:10.1016/j.biortech.2012.06.108  Key: citeulike:11023946

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Abstract

Bacillus subtilis MUR1 is a novel lactic acid (LA) producing strain that has the potential for industrial production of LA due to its high productivity of LA, high yield of substrate conversion, and high final concentration of LA produced. B. subtilis MUR1 can produce 99.3 and 183.2 g/l of l-LA in 12 and 52 h respectively with a 98.5% substrate conversion yield and a maximum l-LA production rate of 16.1 g/l/h. Compared with batch culture, and several fed-batch cultures with different initial glucose concentrations, the fed-batch culture with initial 30 g/l glucose produced the highest final concentration and productivity of l-LA. Corn steep liquor can be used to partly replace yeast extract in the production medium for the production of l-LA by B. subtilis MUR1. ⺠A novel mutant strain of Bacillus subtilis can produce a very high concentration of l-lactic acid. ⺠99 and 183 g/l of l-lactic acid was produced in 12 and 52 h, respectively. ⺠The maximum l-lactic acid productivity was 16 g/l/h.


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