Journal
APPLIED BIOCHEMISTRY AND BIOTECHNOLOGY
Volume 168, Issue 8, Pages 2387-2397Publisher
SPRINGER
DOI: 10.1007/s12010-012-9944-9
Keywords
Bacillus coagulans; Lactic acid; Xylose; Non-sterilized fermentation; Biomass
Funding
- National Natural Science Foundation of China [31070513]
- Excellent Youth Foundation of Jiangsu Province of China [BK2012038]
- Major Program of the Natural Science Foundation of Jiangsu Higher Education of China [10KJA22019]
- Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
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Xylose is the major pentose and the second most abundant sugar in lignocellulosic feedstock. Its efficient utilization is regarded as a technical barrier to the commercial production of bulk chemicals from lignocellulosic biomass. This work aimed at evaluating the lactic acid production from the biomass-derived xylose using non-sterilized fermentation by Bacillus coagulans NL01. A maximum lactic acid concentration of about 75 g/L was achieved from xylose of 100 g/L after 72 h batch fermentation. Acetic acid and levulinic acid were identified as important inhibitors in xylose fermentation, which markedly reduced lactic acid productivity at 15 and 1.0 g/L, respectively. But low concentrations of formic acid (< 2 g/L) exerted a stimulating effect on the lactic acid production. When prehydrolysate containing total 25.45 g/L monosaccharide was fermented with B. coagulans NL01, the same preference for glucose, xylose, and arabinose was observed and18.2 g/L lactic acid was obtained after 48 h fermentation. These results proved that B. coagulans NL01 was potentially well-suited for producing lactic acid from underutilized xylose-rich prehydrolysates.
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