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Researchers from Auburn University Report Findings in Ethanol (Impact of pseudo-continuous fermentation on the ethanol tolerance of Scheffersomyces...

August 26, 2014



Researchers from Auburn University Report Findings in Ethanol (Impact of pseudo-continuous fermentation on the ethanol tolerance of Scheffersomyces stipitis)

By a News Reporter-Staff News Editor at Life Science Weekly -- Investigators discuss new findings in Ethanol. According to news originating from Auburn, Alabama, by NewsRx correspondents, research stated, "In this work we conducted the pseudo-continuous fermentation, i.e., continuous fermentation with cell retention, using Scheffersomyces stipitis, and studied its effect on ethanol tolerance of the strain. During the fermentation experiments, S. stipitis was adapted to a mild concentration of ethanol (20-26 g/L) for two weeks."

Our news journalists obtained a quote from the research from Auburn University, "Two substrates (glucose and xylose) were used in different fermentation experiments. After fermentation, various experiments were performed to evaluate the ethanol tolerance of adapted cells and unadapted cells. Compared to the unadapted cells, the viability of adapted cells increased by 8 folds with glucose as the carbon source and 6 folds with xylose as the carbon source following exposure to 60 g/L ethanol for 2 h. Improved ethanol tolerance of the adapted cells was also revealed in the effects of ethanol on plasma membrane permeability, extracellular alkalization and acidification. The mathematical modeling of cell leakage, extracellular alkalization and acidification revealed that cells cultured on glucose show better ethanol tolerance than cells cultured on xylose but the differences become smaller for adapted cells."

According to the news editors, the research concluded: "The results show that pseudo-continuous fermentation can effectively improve cell's ethanol tolerance due to the environmental pressure during the fermentation process."

For more information on this research see: Impact of pseudo-continuous fermentation on the ethanol tolerance of Scheffersomyces stipitis. Journal of Bioscience and Bioengineering, 2013;116(3):319-26. (Elsevier - www.elsevier.com; Journal of Bioscience and Bioengineering - www.elsevier.com/wps/product/cws_home/505516)

The news correspondents report that additional information may be obtained from M. Liang, Dept. of Chemical Engineering, Auburn University, Auburn, AL 36849, United States. Additional authors for this research include M.H. Kim, Q.P. He and J. Wang (see also Ethanol).

Keywords for this news article include: Auburn, Alabama, Alcohols, United States, Ethanolamines, North and Central America.

Our reports deliver fact-based news of research and discoveries from around the world. Copyright 2014, NewsRx LLC


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Source: Life Science Weekly


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