약주 제조를 위한 저온 적응성 효모의 특성
Characteristics of yeast with low temperature adaptation for Yakju brewed
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초록
발효식품에서 분리한 효모 482균주의 저온적응성 및 알코올 생성능을 확인하고 β-glucosidase와 cerulenin, TFL저항성을 실험하여 저온적응성이 우수하고 향기성분 활성이 좋은 Y297 균주를 선발하였다. 26s rRNA 염기서열을 분석한 결과, Y297은 Saccharomyces cerevisiae로 동정되었다. 선발된 균주는 15℃에서는 25℃에 비해 정지상으로에 도달하는 시간은 오래 걸리지만 보다 많은 균수를 유지하였다. YPD 액체배지에 알코올 농도 10%와 glucose 60% 그리고 NaCl 8%가 포함된 배지에서 내성을 확인할 수 있었다. YPD(glucose 25%)배지에서 배양한 효모의 세포질 단백질을 추출하여 β-glucosidase와 esterase의 활성을 측정한 결과 시판효모보다 우수한 활성을 나타냈다. 이러한 결과를 통해 선발된 Y297는 약주제조에 적합한 종균효모로써의 가능성을 확인할 수 있었다.
Abstract
The objectives of this study were to isolate and characterize low temperature adaptation yeast and to obtain suitable yeasts strains for manufacturing Yakju. In this study, we isolated 482 wild yeasts from fermented foods. Out of these, 5 yeast strains were selected based on increased growth at low temperature (15℃) and high β-glucosidase activity. To screen the aromatic level of isolates, media containing cerulenin and 5,5,5-trifluor-DL-leucine (TFL) were used. Y297 strain demonstrated tolerance against TFL and produced more than 13% alcohol. Y297 strain was identified a Saccharomyces cerevisiae based on the 26S rDNA gene sequences. Maximum cell growth was observed after 19 hr and 38 hr of incubation at 25℃ and 15℃, respectively. The exponential phase was followed by a lengthy stationary phase, at 15℃, when the cells remained high viable. Y297 strain demonstrated tolerance against alcohol (10%), glucose (60%) and salt(NaCl, 8%). β-glucosidase and esterase activity in Y297 were higher than those of controls at 15℃. Overall, these results indicated that using wild yeast strain, isolated from fermented food, affects the chemical characteristics of the brewed Yakju.
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