title: Effects of end products on fermentation profiles in Clostridium carboxidivorans P7 for syngas fermentation.
abstract: Clostridium carboxidivorans P7 is a strict anaerobic bacterium capable of converting syngas to biofuels. However, its fermentation profiles is poorly understood. Here, various end-products, including acetic acid, butyric acid, hexanoic acid, ethanol and butanol were supplemented to evaluate their effects on fermentation profiles in C. carboxidivorans at two temperatures. At 37°C, fatty acids addition likely led to more corresponding alcohols production. At 25°C, C2 and C4 fatty acids supplementation resulted in more corresponding higher fatty acids, while supplemented hexanoic acid increased yields of C2 and C4 fatty acids and hexanol. Supplementation of ethanol or butanol caused increased production of C2 and C4 acids at both temperatures; however, long-chain alcohols were still more likely produced at lower temperature. In conclusion, fermentation profiles of C. carboxidivorans can be changed in respond to pre-added end-products and carbon flow may be redirected to desired products by controlling culture conditions.
authors.affiliation: Department of Biosystems Engineering, Auburn University, Auburn, AL 36849, USA.
authors.forename: Jie
authors.initials: J
authors.lastname: Zhang
authors.affiliation: Department of Biosystems Engineering, Auburn University, Auburn, AL 36849, USA; Center for Bioenergy and Bioproducts, Auburn University, Auburn, AL 36849, USA.
authors.forename: Steven
authors.initials: S
authors.lastname: Taylor
authors.affiliation: Department of Biosystems Engineering, Auburn University, Auburn, AL 36849, USA; Center for Bioenergy and Bioproducts, Auburn University, Auburn, AL 36849, USA. Electronic address: yiwang3@auburn.edu.
authors.forename: Yi
authors.initials: Y
authors.lastname: Wang
mesh_terms: D019342:Acetic Acid / Q000494:pharmacology; D056804:Biofuels / Q000382:microbiology*; D018533:Biomass; D019149:Bioreactors / Q000382:microbiology; D000440:Butanols / Q000494:pharmacology; D002208:Caproates / Q000494:pharmacology; D003013:Clostridium / Q000187:drug effects / Q000254:growth & development / Q000378:metabolism*; D000431:Ethanol / Q000378:metabolism; D005227:Fatty Acids / Q000494:pharmacology; D005285:Fermentation / Q000187:drug effects; D006863:Hydrogen-Ion Concentration; D013696:Temperature
chemical_list: D056804:Biofuels; D000440:Butanols; D002208:Caproates; D005227:Fatty Acids; C037652:hexanoic acid; D000431:Ethanol; D019342:Acetic Acid
keywords: Biofuels; Clostridium carboxidivorans; End product; Fermentation profiles; Syngas fermentation