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Efficient conversion of xylose to ethanol by stress-tolerant Kluyveromyces marxianus BUNL-21
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Efficient conversion of xylose to ethanol by stress-tolerant Kluyveromyces marxianus BUNL-21
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Journal Article
Efficient conversion of xylose to ethanol by stress-tolerant Kluyveromyces marxianus BUNL-21
2016
Overview
The fermentation ability of thermotolerant
Kluyveromyces marxianus
BUNL-21 isolated in Laos was investigated. Comparison with thermotolerant
K. marxianus
DMKU3-1042 as one of the most thermotolerant yeasts isolated previously revealed that the strain possesses stronger ability for conversion of xylose to ethanol, resistance to 2-deoxyglucose in the case of pentose, and tolerance to various stresses including high temperature and hydrogen peroxide.
K. marxianus
BUNL-21 was found to have ethanol fermentation activity from xylose that is slightly lower and much higher than that of
Scheffersomyces stipitis
(
Pichia stipitis
) at 30 °C and at higher temperatures, respectively. The lower ethanol production seems to be due to large accumulation of acetic acid. The possible mechanism of acetic acid accumulation is discussed. In addition, it was found that both
K. marxianus
strains produced ethanol in the presence of 10 mM hydroxymethylfurfural or furfural, at a level almost equivalent to that in their absence. Therefore,
K. marxianus
BUNL-21 is a highly competent yeast for high-temperature ethanol fermentation with lignocellulosic biomass.
Publisher
Springer International Publishing,Springer Nature B.V
