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Fermentation
Volume 6
Issue 4
10.3390/fermentation6040107
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Article

Abatement of Inhibitors in Recycled Process Water from Biomass Fermentations Relieves Inhibition of a Saccharomyces cerevisiae Pentose Phosphate Pathway Mutant †

by
Nancy N. Nichols
*,
Ronald E. Hector
,
Jeffrey A. Mertens
and
Sarah E. Frazer
USDA Agricultural Research Service, National Center for Agricultural Utilization Research, Bioenergy Research Unit, 1815 N, University Street, Peoria, IL 61604, USA
*
Author to whom correspondence should be addressed.
†
Mention of trade names or commercial products in this article is solely for the purpose of providing specific information and does not imply recommendation or endorsement by the US Department of Agriculture. USDA is an equal opportunity employer.
Fermentation 2020, 6(4), 107; https://doi.org/10.3390/fermentation6040107
Submission received: 30 September 2020 / Revised: 30 October 2020 / Accepted: 6 November 2020 / Published: 10 November 2020
(This article belongs to the Special Issue Ethanol and Value-Added Co-Products 2.0)
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Abstract

Understanding the nature of fermentation inhibition in biomass hydrolysates and recycled fermentation process water is important for conversion of biomass to fuels and chemicals. This study used three mutants disrupted in genes important for tolerance to either oxidative stress, salinity, or osmolarity to ferment biomass hydrolysates in a xylose-fermenting Saccharomyces cerevisiae background. The S. cerevisiaeZWF1 mutant with heightened sensitivity to fermentation inhibitors was unable to ferment corn stover dilute-acid hydrolysate without conditioning of hydrolysate using a fungal strain, Coniochaeta ligniaria, to consume inhibitors. Growth of two other strains, a salt-sensitive HAL4 mutant and a GPD1 mutant sensitive to osmotic stress, was not negatively affected in hydrolysate compared to the parent xylose-metabolizing strain. In recycled fermentation process water, inhibition of the ZWF1 mutant could again be remediated by biological abatement, and no effect on growth was observed for any of the mutants compared to the parent strain.
Keywords: biomass; fermentation; inhibitors; ethanol biomass; fermentation; inhibitors; ethanol

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MDPI and ACS Style

Nichols, N.N.; Hector, R.E.; Mertens, J.A.; Frazer, S.E. Abatement of Inhibitors in Recycled Process Water from Biomass Fermentations Relieves Inhibition of a Saccharomyces cerevisiae Pentose Phosphate Pathway Mutant. Fermentation 2020, 6, 107. https://doi.org/10.3390/fermentation6040107

AMA Style

Nichols NN, Hector RE, Mertens JA, Frazer SE. Abatement of Inhibitors in Recycled Process Water from Biomass Fermentations Relieves Inhibition of a Saccharomyces cerevisiae Pentose Phosphate Pathway Mutant. Fermentation. 2020; 6(4):107. https://doi.org/10.3390/fermentation6040107

Chicago/Turabian Style

Nichols, Nancy N., Ronald E. Hector, Jeffrey A. Mertens, and Sarah E. Frazer. 2020. "Abatement of Inhibitors in Recycled Process Water from Biomass Fermentations Relieves Inhibition of a Saccharomyces cerevisiae Pentose Phosphate Pathway Mutant" Fermentation 6, no. 4: 107. https://doi.org/10.3390/fermentation6040107

APA Style

Nichols, N. N., Hector, R. E., Mertens, J. A., & Frazer, S. E. (2020). Abatement of Inhibitors in Recycled Process Water from Biomass Fermentations Relieves Inhibition of a Saccharomyces cerevisiae Pentose Phosphate Pathway Mutant. Fermentation, 6(4), 107. https://doi.org/10.3390/fermentation6040107

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