초록
<P><I>Clostridium sporogenes</I> BE01, a non-acetone forming butanol producer, can produce hydrogen and volatile fatty acids (VFAs) during butanol fermentation from rice straw hydrolysate. Bio-electrochemical analysis revealed the changes that occurred in the redox microenvironment and electron transport mediators during fermentation at different pH and CaCO<SUB>3</SUB> concentrations. CaCO<SUB>3</SUB> played a very important role in enhancing the production of hydrogen, volatile fatty acids and solvents by stimulating the changes in the electron transport system. The electron transport system mediated by NAD/NADH, flavins, Fe–S clusters, protein bound FAD, and cytochrome complex in <I>C. sporogenes</I> BE01 was analysed by cyclic voltammetry (CV). Electrokinetic analysis revealed that the favorability for redox reactions increased with an increase in pH, and the polarization resistance reduced significantly with CaCO<SUB>3</SUB> supplementation.</P><BR><BR><P>Graphic Abstract</P><P>Hydrogen and VFAs production during butanol fermentation in rice straw hydrolysate by <I>Clostridium sporogenes</I> BE01 and the electron transport mediators involved.<BR><IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c5gc00310e'><BR></P>