Journal
GLOBAL CHANGE BIOLOGY BIOENERGY
Volume 14, Issue 11, Pages 1150-1161Publisher
WILEY
DOI: 10.1111/gcbb.12992
Keywords
acetic acid; cellulosic ethanol; hemp; kenaf; lignocellulosic biomass; Saccharomyces cerevisiae; xylose fermentation
Funding
- Rural Development Administration [PJ01577003]
- National Research Foundation of Korea [NRF-2022R1I1A1A01072158]
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This study demonstrates that alkaline deacetylation prior to acid pretreatment is effective in improving fermentation performance of Saccharomyces cerevisiae for biofuel production from lignocellulosic biomass. Acetate inhibition can be overcome by this treatment, resulting in increased ethanol productivity.
Lignocellulosic hydrolysates contain acetic acid derived from hemicellulose. Acetate released during acid pretreatment interferes with enzymatic saccharification of the biomass and inhibits yeast fermentation, caused by cellular oxidation and stress. This study used alkaline deacetylation prior to acid pretreatment and evaluated its influence on the fermentation performance of Saccharomyces cerevisiae using two different lignocellulosic biomasses, hemp (Cannabis sativa) and kenaf (Hibiscus cannabinus). They are valuable for biofuel production. The maximal acetate removal with minimal sugar loss was obtained with 1% (w/v) NaOH treatment for both biomasses. Deacetylation pretreatment under this condition was effective both in enzymatic saccharification and simultaneous saccharification and fermentation. This resulted in improved ethanol production by xylose-consuming yeast (S. cerevisiae SR8) by removing 4.7 g/L of acetate from hemp and 6.3 g/L from kenaf, thus resulting in the ethanol productivities of 0.79 and 0.67 g/L-h from hemp and kenaf, respectively. This suggests that strategies to overcome acetate inhibition are necessary to efficiently use the lignocellulosic biomass as a source for bioenergy production.
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