BioChem - DOS

Enhanced butanol production by modulation of electron flow in Clostridium acetobutylicum B3 immobilized by surface adsorption

Bioresource technology : biomass, bioenergy, biowastes, conversion technologies, biotransformations, production technologies

Liu, D.; Chen, Y.; Li, A.; Ding, F.; Zhou, T.; He, Y.; Li, B.; Niu, H.; Lin, X.; Xie, J.; Chen, X.; Wu, J.; Ying, H.

The objective of this study was to improve butanol yield and productivity by redox modulation and immobilization of Clostridium acetobutylicum B3 cells. Stoichiometric network analysis revealed that NAD(P)H that had escaped from the fermentation as H<SUB>2</SUB> limited the butanol yield and led to the accumulation of oxidation byproducts, e.g., acetone. Methyl viologen was used as an electron carrier to divert the electron flow away from H<SUB>2</SUB> production and to reinforce the NAD(P)H supply. Butanol yield was increased by 37.8% with severely diminished acetone production. Immobilization of the cells by adsorption onto a fibrous matrix improved their butanol tolerance and production rate. An average of 15.6g/L butanol was achieved within 12h with a solvent productivity of 1.88g/L/h in repeated batch fermentation. To our knowledge, this is the highest solvent productivity with a relatively high butanol titer produced by a Clostridium strain in batch fermentation.

2013

Elsevier Applied Science

0960-8524

129

pp.321-328

10.1016/j.biortech.2012.11.090

http://click.ndsl.kr/servlet/OpenAPIDetailView?keyValue=05787966&target=NART&cn=NART65520723

Butanol tolerance; Clostridium acetobutylicum; Immobilization; Metabolic flux; NAD(P)H