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Impact of zinc supplementation on the improvement of ethanol tolerance and yield of self-flocculating yeast in continuous ethanol fermentation

Paper ID Volume ID Publish Year Pages File Format Full-Text
24756 43535 2009 6 PDF Available
Title
Impact of zinc supplementation on the improvement of ethanol tolerance and yield of self-flocculating yeast in continuous ethanol fermentation
Abstract

The effects of zinc supplementation were investigated in the continuous ethanol fermentation using self-flocculating yeast. Zinc sulfate was added at the concentrations of 0.01, 0.05 and 0.1 g l−1, respectively. Reduced average floc sizes were observed in all the zinc-supplemented cultures. Both the ethanol tolerance and thermal tolerance were significantly improved by zinc supplements, which correlated well with the increased ergosterol and trehalose contents in the yeast flocs. The highest ethanol concentration by 0.05 g l−1 zinc sulfate supplementation attained 114.5 g l−1, in contrast to 104.1 g l−1 in the control culture. Glycerol production was decreased by zinc supplementations, with the lowest level 3.21 g l−1, about 58% of the control. Zinc content in yeast cells was about 1.4 μMol g−1 dry cell weight, about sixfold higher than that of control in all the zinc-supplemented cultures, and close correlation of zinc content in yeast cells with the cell viability against ethanol and heat shock treatment was observed. These studies suggest that exogenous zinc addition led to a reprogramming of cellular metabolic network, resulting in enhanced ethanol tolerance and ethanol production.

Keywords
Continuous ethanol fermentation; Ethanol/thermal tolerance; Self-flocculating yeast; Zinc supplement
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Impact of zinc supplementation on the improvement of ethanol tolerance and yield of self-flocculating yeast in continuous ethanol fermentation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Biotechnology - Volume 139, Issue 1, 1 January 2009, Pages 55–60
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
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Don't Miss Today's Special Offer
Price was $35.95
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Price after discount Only $4.95
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