Screening of Thermotolerant Yeast Strain for Ethanol Fermentation

Ethanol 발효를 위한 내열성 효모 균주의 Screening

  • Ryu, Beung-Ho (Department of Food Science and Technology, College of Engineering, Kyungsung University) ;
  • Nam, Ki-Du (Laboratory, Il San Trading Co., Ltd.) ;
  • Kim, Hae-Sung (Department of Food Science and Technology, College of Engineering, Kyungsung University) ;
  • Kim, Dong-Seuk (Department of Food Science and Technology, College of Engineering, Kyungsung University) ;
  • Ji, Young-Ae (Department of Food Science and Technology, College of Engineering, Kyungsung University) ;
  • Jung, Soo-Ja
  • Published : 1988.08.01

Abstract

For the purpose of developing new thermotolerant yeast strains for ethanol fermentation, yeasts were isolated from molasses and screened for their fermentation ability at elevated temperatures. Three candidate strains were screened. These strains preferred pH 5.0 and 34$^{\circ}C$ for their ethanol production. Under such conditions the three strains showed average ethanol productivity of 75g ethanol per liter of fermentation broth in n synthetic medium containing glucose as substrate. These strains were identified as Saccharomyces cerevisiae and Kluveromyces marxianus.

고온 알코올 발효에 필요한 새로운 내열성 효모 균주를 개발할 목적으로, 당밀에서 분리하였다. 내열성 효모중 높은 온도에서 알코올 생산능을 검토하여 알코올 생산능이 우수한 3균주를 얻었다. 이들 균주는 pH5.0, 34$^{\circ}C$에서 알코올 발효를 하였을 때 기질로서 포도당을 함유한 합성배지에서 평균 75g/ι의 알코올을 얻을 수 있었다. 이들 균주는 Saccharomyces cerevisiae와 Kluveromyces marxianus로 동정되었다.

Keywords