Efficient l-lactic acid production from sweet sorghum bagasse by open simultaneous saccharification and fermentation
2016
Wang, Y. | Wang, M. | Cai, D. | Wang, B. | Wang, Z. | Qin, P. | Tan, T.
As an important industrial feedstock with various applications, most lactic acid is currently fermented from refined food carbohydrates. To research the feasibility of using non-food feedstock for l-lactic acid production, sweet sorghum bagasse (SSB) as an important lignocellulosic biomass was used by Bacillus coagulans LA1507 in open simultaneous saccharification and fermentation (SSF). In the fed-batch SSF process with a stepwise controlled pH, a cellulase dose of 25 FPU g⁻¹ pretreated SSB and 15 g L⁻¹ corn steep liquor powder (CSLP) were used to produce l-lactic acid from 17.5% (w/v) stover, and B. coagulans LA1507 provided a balanced result which contained a product titer of 111 g L⁻¹, a yield of 0.437 g g⁻¹ crude SSB and an average productivity of 1.59 g L⁻¹ h⁻¹. The process introduces an effective way to produce l-lactic acid from abundant SSB.
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