期刊
BIORESOURCE TECHNOLOGY
卷 325, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2021.124729
关键词
Chinese distillers' grains; Thermostable cellulase; Biodegradation; Synergistic effect; Co-culture
资金
- Guizhou Province Science and Technology Support Program [[2018]2314]
- Excellent Young Scientific and Technological Talent Program [[2019]5645]
- Science and Technology Platform and Talent Team Project [[2018]5251]
- Zunyi City Innovative Talent Team Project [[2020]9]
- Talent Base of Fermentation Engineering and Liquor Making in Guizhou Province [[2018]3]
- School of Liquor and Food Engineering, Guizhou University
This study found that the thermostable cellulase-producing bacteria Bacillus licheniformis A5 can synergistically improve the degradation of Chinese distillers' grains (CDGs) with Bacillus subtilis B2. Co-culturing these two strains increased the degradation rate of CDGs by 70%, showing potential for more efficient degradation approaches in the Chinese liquor industry.
Lack of effective degradation approaches of Chinese distillers' grains (CDGs) produced by Chinese liquor industry results in environmental pollution and economic waste. Cellulase activity was characterized at different temperatures to find thermostable cellulase-producing bacteria, and microbial co-culture method was used to improve the degradation of CDGs. Incubation of endoglucanase produced by Bacillus licheniformis A5 at 80 degrees C for 120 min showed 82% residual enzyme activity. Notably, enzyme activity increased by 30%-70% after co-culturing Bacillus licheniformis A5 and Bacillus subtilis B2. The two strains increased degradation rate of CDGs by 70% compared with optimized results of Bacillus subtilis B2 culture alone, and increased the reducing sugar content to 16.6 mg/mL. In addition, 2% ethanol increased degradation rate of CDGs by 15% in co-culture. The findings of this study imply that Bacillus licheniformis A5 acts synergistically with Bacillus subtilis B2 to improve degradation of CDGs.
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