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Title: Assessing the potential of wild yeasts for bioethanol production
Authors: Ruyters, Stefan ×
Mukherjee, Vaskar
Verstrepen, Kevin
Thevelein, Johan
Willems, Kris
Lievens, Bart #
Issue Date: Jan-2015
Publisher: Published by Stockton Press on behalf of the Society for Industrial Microbiology
Series Title: Journal of Industrial Microbiology & Biotechnology vol:42 issue:1 pages:39-48
Abstract: Bioethanol fermentations expose yeasts to a new, complex and challenging fermentation medium with specific inhibitors and sugar mixtures depending on the type of carbon source. It is, therefore, suggested that the natural diversity of yeasts should be further exploited in order to find yeasts with good ethanol yield in stressed fermentation media. In this study, we screened more than 50 yeast isolates of which we selected five isolates with promising features. The species Candida bombi, Wickerhamomyces anomalus and Torulaspora delbrueckii showed better osmo- and hydroxymethylfurfural tolerance than Saccharomyces cerevisiae. However, S. cerevisiae isolates had the highest ethanol yield in fermentation experiments mimicking high gravity fermentations (25 % glucose) and artificial lignocellulose hydrolysates (with a myriad of inhibitors). Interestingly, among two tested S. cerevisiae strains, a wild strain isolated from an oak tree performed better than Ethanol Red, a S. cerevisiae strain which is currently commonly used in industrial bioethanol fermentations. Additionally, a W. anomalus strain isolated from sugar beet thick juice was found to have a comparable ethanol yield, but needed longer fermentation time. Other non-Saccharomyces yeasts yielded lower ethanol amounts.
ISSN: 1367-5435
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Bioengineering Technology TC, Technology Campus De Nayer Sint-Katelijne-Waver
Centre of Microbial and Plant Genetics
Molecular Microbiology and Biotechnology Section - miscellaneous
Technologiecluster Bioengineering Technologie
× corresponding author
# (joint) last author

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