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论文类型： 期刊论文

发表时间： 2013-05-10

发表刊物： JOURNAL OF BIOTECHNOLOGY

收录刊物： SCIE、EI、PubMed、Scopus

卷号： 165

期号： 1

页面范围： 18-21

ISSN号： 0168-1656

关键字： Clostridium acetobutylicum; ABE fermentation; Zinc supplementation; Oxidation-reduction potential; Productivity

摘要： In this article, effect of zinc supplementation on acetone-butanol-ethanol (ABE) fermentation by Clostridium acetobutylicum was studied. It was found that when 0.001 g/L ZnSO4 center dot 7H(2)O was supplemented into the medium, solventogenesis was initiated earlier, with 21.0 g/L ABE (12.6 g/L butanol, 6.7 g/L acetone and 1.7 g/L ethanol) produced with a fermentation time of 40 h, compared to 19.4 g/L ABE (11.7 g/L butanol, 6.4 g/L acetone and 1.3 g/L ethanol) produced with a fermentation time of 64 h in the control without zinc supplementation, and correspondingly ABE and butanol productivities were increased to 0.53 and 0.32 g/L/h from 0.30 and 0.18 g/L/h, increases of 76.7% and 77.8%, respectively, but their yields were not compromised. The reason for this phenomenon was attributed to rapid acids re-assimilation for more efficient ABE production, which was in accordance with relatively high pH and ORP levels maintained during the fermentation process. The maximum cell density increased by 23.8%, indicating that zinc supplementation stimulated cell growth, and consequently facilitated glucose utilization. However, more zinc supplementation exhibited an inhibitory effect, indicating that zinc supplementation at very low levels such as 0.001 g/L ZnSO4 center dot 7H(2)O will be an economically competitive strategy for improving butanol production. (C) 2013 Elsevier B. V. All rights reserved.