BioChem - DOS

Genetic engineering of Clostridium acetobutylicum to enhance isopropanol-butanol-ethanol production with an integrated DNA-technology approach

Renewable energy

Bankar, S.B.; Jurgens, G.; Survase, S.A.; Ojamo, H.; Granstrom, T.

Acetone being a non-fuel solvent produced during the traditional acetone-butanol-ethanol (ABE) fermentation by Clostridium acetobutylicum; reduces the overall fuel alcohol yield. However, the conversion of acetone into isopropanol has been recommended to improve the process economy. The present study aims to develop an engineered C. acetobutylicum DSM 792 strain to convert acetone into isopropanol by introducing the secondary alcohol dehydrogenase gene from Clostridium beijerinckii NRRL B593 using the allele-coupled exchange approach. Batch and continuous fermentation experiments were carried out with a modified strain C. acetobutylicum DSM 792-ADH to improve the isopropanol yield and titer. The growth and production behavior of the modified strain in stationary flask culture and controlled batch culture was studied. Almost 50% of acetone was converted into isopropanol with highest total solvent yield to be 0.39 g g<SUP>-1</SUP> glucose. The modified strain also utilized sugar mixture and SO<SUB>2</SUB>-ethanol-water spent liquor as a substrate to produce the solvents.

2015

Pergamon Press

0960-1481

83

pp.1076-1083

10.1016/j.renene.2015.05.052

http://click.ndsl.kr/servlet/OpenAPIDetailView?keyValue=05787966&target=NART&cn=NART72337934

Clostridia; IBE; Immobilization; Isopropanol; Fermentation; Column reactor