1. Achieving efficient and rapid high-solids enzymatic hydrolysis for producing high titer ethanol with the assistance of di-rhamnolipids.
- Author
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Qiao, Hui, Ma, Zewen, Wang, Yan, Zheng, Zhaojuan, and Ouyang, Jia
- Subjects
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CORN stover , *ETHANOL , *XYLANS , *HYDROLYSIS , *TITERS , *FORMIC acid , *FERMENTATION - Abstract
[Display omitted] • High proportion of di-rhamnolipid can enhance enzymatic hydrolysis. • Incorporation of di-rhamnolipid in enzymatic hydrolysis yielded 196 g/L glucose. • 89.1 g/L ethanol was obtained from the fermentation of enzymatic hydrolysate. High-solids enzymatic hydrolysis is the premise of obtaining high concentration ethanol by fermentation. In this study, corn stover was first pretreated with formic acid under mild conditions, and more than 70 % of xylan and lignin were removed within the first hour. 173.0 g/L glucose was achieved from total 30 % solid of the pretreated corn stover via fed-batch mode. Moreover, the glucose concentration rose to 194.5 g/L and the hydrolysis time was significantly reduced by 42.9 % with the addition of di-rhamnolipid. On this basis, 89.1 g/L ethanol was obtained by fermentation, and the presence of di-rhamnolipid had no negative effect on fermentation. The effective conversion of corn stover to high titer ethanol provides support for the conversion of stover to ethanol in industrial production. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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