NDLI: Sweet Sorghum Juice and Bagasse as Feedstocks for the Production of Optically Pure Lactic Acid by Native and Engineered Bacillus coagulans Strains

Content Provider	Springer Nature Link
Author	Ou, Mark S. Awasthi, Deepika Nieves, Ismael Wang, Liang Erickson, John Vermerris, Wilfred Ingram, L. O. Shanmugam, K. T.
Copyright Year	2015
Abstract	Sweet sorghum is a bioenergy crop that produces large amounts of soluble sugars in its stems (3–7 Mg ha$^{−1}$) and generates significant amounts of bagasse (15–20 Mg ha$^{−1}$) as a lignocellulosic feedstock. These sugars can be fermented not only to biofuels but also to bio-based chemicals. The market potential of the latter may be higher given the current prices of petroleum and natural gas. The yield and rate of production of optically pure d-(−)- and l-(+)-lactic acid as precursors for the biodegradable plastic polylactide was optimized for two thermotolerant Bacillus coagulans strains. Strain 36D1 fermented the sugars in unsterilized sweet sorghum juice at 50 °C to l-(+)-lactic acid (∼150 g L$^{−1}$; productivity, 7.2 g L$^{−1}$ h$^{−1}$). B. coagulans strain QZ19-2 was used to ferment sorghum juice to d-(−)-lactic acid (∼125 g L$^{−1}$; productivity, 5 g L$^{−1}$ h$^{−1}$). Carbohydrates in the sorghum bagasse were also fermented after pretreatment with 0.5 % phosphoric acid at 190 °C for 5 min. Simultaneous saccharification and co-fermentation of all the sugars (SScF) by B. coagulans resulted in a conversion of 80 % of available carbohydrates to optically pure lactic acid depending on the B. coagulans strain used as the microbial biocatalyst. Liquefaction of pretreated bagasse with cellulases before SScF (L + SScF) increased the productivity of lactic acid. These results show that B. coagulans is an effective biocatalyst for fermentation of all the sugars present in sweet sorghum juice and bagasse to optically pure lactic acid at high titer and productivity as feedstock for bio-based plastics.
Starting Page	123
Ending Page	131
Page Count	9
File Format	PDF
ISSN	19391234
Journal	BioEnergy Research
Volume Number	9
Issue Number	1
e-ISSN	19391242
Language	English
Publisher	Springer US
Publisher Date	2015-08-30
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Bacillus coagulans Fermentation Lactic acid Sorghum bicolor Plant Sciences Plant Genetics & Genomics Plant Breeding/Biotechnology Plant Ecology Wood Science & Technology
Content Type	Text
Resource Type	Article
Subject	Renewable Energy, Sustainability and the Environment Agronomy and Crop Science

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