Acidogenesis driven by hydrogen partial pressure towards bioethanol production through fatty acids reduction
메타 데이터
바이오화학분류
바이오플라스틱
플라스틱
바이오정밀화학
용매
화학제품
연료
화장품용 기능성소재
계면활성제⁄증점제
의료용 화학소재
식품첨가제
논문
Acidogenesis driven by hydrogen partial pressure towards bioethanol production through fatty acids reduction
학술지
Energy : technologies, resources, reserves, demands, impact, conservation, management, policy
저자명
Sarkar, Omprakash; Butti, Sai Kishore; Venkata Mohan, S.
초록
<P><B>Abstract</B></P> <P>H<SUB>2</SUB> partial pressure drives the reduction of carboxylic acid (short chain fatty acids) formed as primary metabolites in acidogenic fermentation to form bioalcohols. Microbial catalysis under the influence of H<SUB>2</SUB> partial pressure was evaluated in comparison with a reactor operated at atmospheric pressure under identical conditions. Carboxylic acid reduction gets regulated selectively by the influence of elevated pressures and redox conditions, resulting in the formation of alcohols. The non-equilibrium of the intra and extracellular H<SUB>2</SUB> ions causes the anaerobic bacteria to alter their pathways as a function of interspecies H<SUB>2</SUB> transfer. Ethanol production was quantified, as acetic acid was the major carboxylic acid synthesised during acidogenesis. H<SUB>2</SUB> pressure influenced the electrochemical activity which was reflected in the distinct variation of the electron transfer rates and the catalytic activity of redox mediators (NAD<SUP>+</SUP>/NADH, flavoproteins and iron-sulphur clusters). The bioprocess depicted in this communication depicted a non-genetic regulation of product formation, understanding the acidogenic metabolism and alternate route for alcohol production.</P> <P><B>Highlights</B></P> <P> <UL> <LI> H<SUB>2</SUB> partial pressure in HPR aided in the reduction of carboxylic acids to alcohols. </LI> <LI> Production and consumption rate of VFAs were correlating with alcohol formation. </LI> <LI> Metabolic shift was evident with bioelectrochical analysis. </LI> <LI> NADH/NAD<SUP>+</SUP> ratio and H<SUB>2</SUB> partial pressure coupled in enhanced solventogenesis. </LI> </UL> </P>