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Characterization of Hexose Fermentation Capability of the Pentose-Fermenting Yeast Candida guilliermondii FTI 20037

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Title: Characterization of Hexose Fermentation Capability of the Pentose-Fermenting Yeast Candida guilliermondii FTI 20037
Author: Wen, Xin
Department: School of Environmental Sciences
Program: Environmental Sciences
Advisor: Lee, Hung
Abstract: The highest ethanol concentrations produced from either glucose or xylose by wild type strains of native pentose-fermenting yeasts typically do not exceed 5% (w/v) in defined media. Candida guilliermondii FTI 20037 is a naturally occurring yeast known for its ability to produce xylitol from xylose. This research, conducted in a defined medium, showed that strain FTI 20037 can ferment 14.4% – 25.9% (w/v) of hexose sugars (glucose, mannose or galactose) individually to ethanol ranging in concentrations from 6% – 9.3% (w/v). This is the first report of a native non-modified xylose-fermenting yeast that can produce such high levels of ethanol from any monomeric sugar in a defined medium. The strain tolerated the inhibitors better than several other pentose-fermenting yeasts in a non-detoxified lodgepole pine (Pinus contorta) hydrolysate. Strain FTI 20037 fermented the sugars to 2% (w/v) ethanol within 24 h in this hydrolysate when it was diluted to 70% (v/v).
URI: http://hdl.handle.net/10214/8618
Date: 2014-12
Rights: Attribution-NonCommercial-NoDerivs 2.5 Canada
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Attribution-NonCommercial-NoDerivs 2.5 Canada Except where otherwise noted, this item's license is described as Attribution-NonCommercial-NoDerivs 2.5 Canada