Improved Ethanol and Reduced Xylitol Production from Glucose and Xylose Mixtures by the Mutant Strain of <Emphasis Type="Italic">Candida shehatae</Emphasis> ATCC 22984 |
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Authors: | Yuan Li Jeung-yil Park Riki Shiroma Masakazu Ike Ken Tokuyasu |
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Institution: | (1) National Food Research Institute, National Agriculture and Food Research Organization, 2-1-12 Kannondai, Tsukuba Ibaraki, 305-8642, Japan |
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Abstract: | A mutant Cs3512, which showed better fermentation of xylose and the mixtures of xylose and glucose, was obtained through mutation
of Candida shehatae ATCC 22984 and screening with a medium containing antimycin A and TTC (2,3,5-triphenyltetrazolium chloride). Cs3512 produced
44.4 g/l of ethanol from 121.3 g/l of xylose, which was 13% higher than that by ATCC 22984. At the same time, xylitol production
was reduced by 38% to 10.2 g/l from 16.3 g/l by ATCC 22984. Cs3512 also showed 8% increase in ethanol yield from 0.39 to 0.42 g/g
comparing to ATCC 22984 when fermenting the sugar mixture composed of 52.9 g/l glucose and 21.2 g/l xylose. When Cs3512 was
used in the simultaneous saccharification and fermentation of lime pretreated rice straw via CaCCO (calcium capturing by carbonation)
process, it produced ethanol at 77% of the theoretical yield. The results imply that Cs3512 is a potential non-recombinant
yeast strain for ethanol production from lignocellulosic biomass. |
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