Journal of the Korea Academia-Industrial cooperation Society (한국산학기술학회논문지)

The Korea Academia-Industrial cooperation Society (한국산학기술학회)
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A Study on the Quality Characteristics of Rice Beer Using Brewing Yeast isolated from Nuruk

누룩에서 분리한 양조용 효모를 이용한 쌀맥주의 품질특성 연구

  • Lee, Young Bog (Dept. of Convergence Industry, Seoul Venture University) ;
  • Ko, Dong Jun (Dept. of Convergence Industry, Seoul Venture University) ;
  • Cheong, Chul (Dept. of Convergence Industry, Seoul Venture University)
  • 이영복 (서울벤처대학원대학교) ;
  • 고동준 (서울벤처대학원대학교) ;
  • 정철 (서울벤처대학원대학교)
  • Received : 2019.10.28
  • Accepted : 2019.12.06
  • Published : 2019.12.31
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Abstract

This study investigated the brewing properties of rice beer made with yeast isolated from traditional whole wheat nuruk. The experimental method was followed by alcohol fermentation and quality analysis for six months after separating the yeast from nuruk. The yeasts isolated from traditional nuruk showed normal fermentation characteristics, like those of commercial yeast, in terms of alcohol production capability, sugar content, and pH reducing power. Especially, the yeast (KCCM 301) isolated from whole wheat nuruk showed higher contents of glycogen and trehalose than that of commercial yeast, and so KCCM 301 yeast has excellent yeast vitality. Meanwhile, the yeast (KCCM 90301) isolated from traditional Nuruk produced significantly higher alcohol and ester contents than that of commercial yeast. This has a positive effect for supplementing the taste and aroma of rice beer. In conclusion, the yeasts isolated from whole wheat nuruk showed the general alcohol fermentation pattern and aroma content of rice beer. These yeasts seem to be effective in strengthening the flavor of rice beer.

본 연구는 전통 통밀누룩에서 분리된 효모의 쌀맥주 양조적성을 조사하는데 목적이 있다. 실험방법은 누룩에서 효모 분리 후 알코올 발효와 품질분석을 6개월간 진행하였다. 전통누룩에서 분리된 효모들은 알코올 생성능 및 당도, pH 감소력 등에서 상업용 효모와 같이 정상적인 발효특성을 보였다. 또한 연이은 2차, 3차 알코올 발효과정에서는 1차 알코올 발효보다 높은 발효력을 나타내어 발효기간이 1일가량 단축되는 결과를 보였다. 전통누룩에서 분리한 2종의 양조용 효모는 상업용효모 S. cereviaise(W107)와 발효특성을 비교했을 때 유사한 발효패턴을 보여 쌀맥주 양조적성에 적합한 것으로 나타났다. 특히 통밀 누룩에서 분리한 S. cereviaise(KCCM90301)효모의 글리코겐과 트레할로오스 함량이 상업용 효모에 비해 높아 효모활력이 우수한 것으로 나타났다. 또한 주요 아로마 성분인 고급알코올과 에스터 농도는 통밀누룩에서 분리한 효모가 상업용 효모에 비해 유의적으로 높은 농도를 나타냈다. 이는 쌀맥주의 맛과 향을 보완하는데 긍정적인 효과가 있는 것으로 판단된다. 결론적으로, 통밀 전통누룩에서 분리한 효모들은 일반적인 알코올 발효패턴과 맥주에서 나타나는 아로마 함량을 보였고, 상업용 효모에 비해서도 고급알코올과 에스터 성분이 유의적으로 높아 쌀맥주의 다소 밍밍한 맛을 보완하여 풍미를 강화는데 효과가 있는 것으로 판단된다.

Keywords

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