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Hemicellulose fermentation by industrial yeast Saccharomyces cerevisiae

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  2010 Pittsburgh, Pennsylvania, June 20 - June 23, 2010  1009508.(doi:10.13031/2013.29920)
Authors:   Ragothaman Avanasi Narasimhan, Ganti S Murthy, Christopher Beatty
Keywords:   Lignocellulosic ethanol, hemicellulose, xylulose utilization, Saccharomyces cerevisiae, chemostat adaptation, high pressure liquid chromatography, xylulose.

A major challenge in ethanol production using lignocellulosic feed stock is inefficient utilization of hemicellulose, which accounts for 20-40% of lignocellulosic biomass. Xylose, often comprises >60% of recoverable sugars from hemicellulose and is a major product of the hemicellulose hydrolysis. Utilization of this carbon source would significantly increase the ethanol yield from an estimated 60 gal/dry ton to 90 gal/dry ton. While xylose is not consumed and fermented efficiently by industrial yeast Saccharomyces cerevisiae, xylulose can be fermented by it. Isomerizing xylose to xylulose can provide an alternative to genetic modification of yeasts for xylose utilization. The objective of this research was to increase xylulose utilization during the fermentation process.

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