Efficient 2,3-Butanediol production from Cassava powder by a crop-biomass-utilizer, enterobacter cloacae subsp. dissolvens SDM

Abstract

Background: 2,3-Butanediol (BD) is considered as one of the key platform chemicals used in a variety of industrial applications. It is crucial to find an efficient sugar-utilizing strain and feasible carbon source for the economical production of BD. Methodology/Principal Findings: Efficient BD production by a newly isolated Enterobacter cloacae subsp. dissolvens SDM was studied using crop-biomass cassava powder as substrate. The culture conditions and fermentation medium for BD production were optimized. Under the optimal conditions, 78.3 g l-1 of BD was produced after 24 h in simultaneous saccharification and fermentation (SSF), with a yield of 0.42 g BD g-1 cassava powder and a specific productivity of 3.3 g l-1 h-1. A higher BD concentration (93.9 g l-1) was produced after 47 h in fed-batch SSF. Conclusions/Significance: The results suggest that strain SDM is a good candidate for the BD production, and cassava powder could be used as an alternative substrate for the efficient production of BD. © 2012 Wang et al.