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BY-NC-ND 3.0 license Open Access Published by De Gruyter Open Access January 29, 2016

New methods for positive selection of yeast ethanol overproducing mutants

  • Kostyantyn V. Dmytruk , Barbara V. Kshanovska , Charles A. Abbas and Andriy Sibirny
From the journal Bioethanol


Fuel ethanol is an environmentally friendly alternative liquid fuel to the widely used petroleum derived transportation liquid fuels. Since 2007, worldwide fuel ethanol production has increased. Currently ethanol is primarily produced from carbohydrates such as sucrose and starch by fermentation using the yeast Saccharomyces cerevisiae. In this work, new approaches for the selection of S. cerevisiae strains with increased ethanol production from hydrolyzed corn meal are described. An industrial production strain of Saccharomyces cerevisiae AS400 was subjected to positive selection of mutants resistant to toxic concentrations of oxythiamine, trehalose, 3-bromopyruvate, glyoxylic acid, and glucosamine. The selected mutants are characterized by 5-8% increase in ethanol yield (g g-1 of consumed glucose) as compared to the parental industrial ethanol-producing strain. A three-step selection approach that consisted of the use of glyoxylic acid, glucosamine and bromopyruvate resulted in a 12% increase in ethanol yield during fermentation on industrial media. These results indicate that the selected strains are promising candidates for industrial ethanol production.


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Received: 2014-12-11
Accepted: 2015-6-29
Published Online: 2016-1-29
Published in Print: 2016-1-1

© 2016 Kostyantyn V. Dmytruk et al.

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

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