title: Enhancement of butanol production in Clostridium acetobutylicum SE25 through accelerating phase shift by different phases pH regulation from cassava flour.
abstract: A prominent delay with 12h was encountered in the phase shift from acidogenesis to solventogenesis in butanol production when the substrate-glucose was replaced by cassava flour. To solve this problem, different phase of pH regulation strategies were performed to shorten this delay time. With this effort, the phase shift occurred smoothly and the fermentation time was shortened. Under the optimal conditions, 16.24g/L butanol and 72h fermentation time were achieved, which were 25.3% higher and 14.3% shorter than those in the case of without pH regulation. Additionally, the effect of CaCO3 on "acid crash" and butanol production was also investigated. It was found that organic acids reassimilation would be of benefit to enhance butanol production. These results indicated that the simple but effective approach for acceleration of phase shift is a promising technique for shortening the fermentation time and improvement of butanol production.
authors.affiliation: College of Bioscience and Engineering, Jiangxi Agricultural University, Jiangxi Engineering Laboratory for the Development and Utilization of Agricultural Microbial Resources, Nanchang 330045, China; The Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi 214122, China.
authors.forename: Han-guang
authors.initials: HG
authors.lastname: Li
authors.affiliation: College of Bioscience and Engineering, Jiangxi Agricultural University, Jiangxi Engineering Laboratory for the Development and Utilization of Agricultural Microbial Resources, Nanchang 330045, China. Electronic address: zqh_net@163.com.
authors.forename: Qing-hua
authors.initials: QH
authors.lastname: Zhang
authors.affiliation: The Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi 214122, China.
authors.forename: Xiao-bin
authors.initials: XB
authors.lastname: Yu
authors.affiliation: The Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi 214122, China.
authors.forename: Luo
authors.initials: L
authors.lastname: Wei
authors.affiliation: The Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi 214122, China.
authors.forename: Qiang
authors.initials: Q
authors.lastname: Wang
mesh_terms: D020001:1-Butanol / Q000378:metabolism*; D001709:Biotechnology; D046969:Clostridium acetobutylicum / Q000254:growth & development / Q000378:metabolism*; D005285:Fermentation; D006863:Hydrogen-Ion Concentration; D002365:Manihot
chemical_list: D020001:1-Butanol
keywords: ABE fermentation; Cassava flour; Clostridium acetobutylicum; Phase shift; pH regulation strategy