Abstract
Thermotolerant yeast strains were isolated from nuruk, a traditional Korean fermentation starter in which variety of microorganisms are present. Among the isolates, the MBY1358 identified as yeast Pichia kudriavzevii showed significantly higher growth rate (0.59±0.00 1/h) at 44°C than other strains. Maximum ethanol concentration of 8.35±0.03g/L was obtained from 20g/L glucose with yield of 0.44±0.01g/g at 44°C, which is 1.14 times ethanol production of the control strain of P. kudriavzevii. The MBY1358, which was significantly more thermotolerant than the control strain and fermented 200g/L glucose to 107.33±5.03g/L ethanol at 44°C, was deposited to Korean Collection for Type Cultures (KCTC) under the accession number 27654.
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