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Effect of zinc supplementation on acetone–butanol–ethanol fermentation by Clostridium acetobutylicum

Paper ID Volume ID Publish Year Pages File Format Full-Text
23578 43453 2013 4 PDF Available
Title
Effect of zinc supplementation on acetone–butanol–ethanol fermentation by Clostridium acetobutylicum
Abstract

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 ZnSO4·7H2O 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 ZnSO4·7H2O will be an economically competitive strategy for improving butanol production.

► Acetone–butanol–ethanol (ABE) fermentation by Clostridium acetobutylicum. ► Zinc supplementation stimulated cell growth and initiated solventogenesis earlier. ► Both butanol and ABE productivities were significantly improved.

Keywords
Clostridium acetobutylicum; ABE fermentation; Zinc supplementation; Oxidation–reduction potential; Productivity
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Effect of zinc supplementation on acetone–butanol–ethanol fermentation by Clostridium acetobutylicum
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Biotechnology - Volume 165, Issue 1, 10 May 2013, Pages 18–21
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
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Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
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Any Questions? feel free to contact us