High-efficient n-butanol production by co-culturing Clostridium acetobutylicum and Saccharomyces cerevisiae integrated with butyrate fermentative supernatant addition.
Butanol is not only an important chemical intermediate and solvent in pharmaceutical and cosmetics industries, but also considered as an advanced biofuel. Although species of the natural host Clostridium have been engineered, butanol titers in the anaerobe seem to be limited by its intolerance to butanol less than 13 g/L. Here we aimed to develop a technology for enhancing butanol production by a co-culture system with butyrate fermentative supernatant addition. First, when adding 4.0 g/L butyrate into the acetone-butanol-ethanol (ABE) fermentation broth with single-shot at 24 h, the "acid crash" phenomenon occurred and the ABE fermentation performance deteriorated. Subsequently, we found that adding certain amino acids could effectively enhance butyrate re-assimilation, butanol tolerance and titer (from 11.1 to 14.8 g/L). Additionally, in order to decrease the raw material cost, butyrate fermentative supernatant produced by Clostridium tyrobutyricum was applied to butanol production in the Clostridium acetobutylicum/Saccharomyces cerevisiae co-culture system, instead of adding synthetic butyrate. Final butanol and total ABE concentrations reached higher levels of 16.3 and 24.8 g/L with increments of 46.8 and 37.8%, respectively. These results show that the proposed fermentation strategy has great potential for efficiently butanol production with an economic approach.
School of Life Science and Food Engineering, Huaiyin Institute of Technology, Huaian, 223003, China. hzluo@hyit.edu.cn.|The Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi, 214122, China. hzluo@hyit.edu.cn.
Hongzhen
http://orcid.org/0000-0002-2111-0917
H
Luo
School of Life Science and Food Engineering, Huaiyin Institute of Technology, Huaian, 223003, China.
Qingwei
Q
Zeng
School of Life Science and Food Engineering, Huaiyin Institute of Technology, Huaian, 223003, China.
Shuo
S
Han
School of Life Science and Food Engineering, Huaiyin Institute of Technology, Huaian, 223003, China.
Zhaoyu
Z
Wang
School of Life Science and Food Engineering, Huaiyin Institute of Technology, Huaian, 223003, China.
Qing
Q
Dong
School of Life Science and Food Engineering, Huaiyin Institute of Technology, Huaian, 223003, China.
Yanhong
Y
Bi
School of Life Science and Food Engineering, Huaiyin Institute of Technology, Huaian, 223003, China.
Yuping
Y
Zhao
D020001:1-Butanol / Q000378:metabolism*; D000596:Amino Acids / Q000378:metabolism; D061249:Batch Cell Culture Techniques / Q000379:methods; D056804:Biofuels; D019149:Bioreactors / Q000382:microbiology; D002087:Butyrates / Q000378:metabolism*; D046969:Clostridium acetobutylicum / Q000254:growth & development* / Q000378:metabolism; D018920:Coculture Techniques / Q000379:methods*; D003470:Culture Media / Q000737:chemistry; D005285:Fermentation; D007218:Industrial Microbiology; D012441:Saccharomyces cerevisiae / Q000254:growth & development* / Q000378:metabolism
D000596:Amino Acids; D056804:Biofuels; D002087:Butyrates; D003470:Culture Media; D020001:1-Butanol
ABE fermentation; Amino acids; Butyrate; Co-culture; N-Butanol