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Production of $Makgeolli$ Using Rice Treated with $Gaeryang-Nuruk$ (for Non-steaming Process) Extract

시판 무증자용 개량누룩 추출물로 처리한 쌀을 이용한 막걸리 제조

  • Park, Ji-Hye (Fermentation & Food Processing Division, National Academy of Agricultural Science, RDA) ;
  • Yeo, Soo-Hwan (Fermentation & Food Processing Division, National Academy of Agricultural Science, RDA) ;
  • Choi, Ji-Ho (Fermentation & Food Processing Division, National Academy of Agricultural Science, RDA) ;
  • Jeong, Seok-Tae (Fermentation & Food Processing Division, National Academy of Agricultural Science, RDA) ;
  • Choi, Han-Seok (Fermentation & Food Processing Division, National Academy of Agricultural Science, RDA)
  • 박지혜 (국립농업과학원 발효이용과) ;
  • 여수환 (국립농업과학원 발효이용과) ;
  • 최지호 (국립농업과학원 발효이용과) ;
  • 정석태 (국립농업과학원 발효이용과) ;
  • 최한석 (국립농업과학원 발효이용과)
  • Received : 2011.08.22
  • Accepted : 2011.12.30
  • Published : 2012.02.28

Abstract

The temperature changes and quality characteristics of $Makgeolli$ produced using rice treated with $Gaeryang-Nuruk$ (commercial improved $Nuruk$) extract were investigated. During fermentation, the treated rice maintained a lower temperature than the control and then rose after the fifth mashing day. For all the treatments, the numbers of yeast, LAB and AAB colonies increased on the second mashing day, and then gradually decreased. As the fermentation proceeded, the pH gradually increased from the third mashing day, and eventually became higher than that on the initial mashing day. The total acid contents increased on the first mashing day, but as the fermentation progressed, they showed little change. The amino acidity and soluble solid contents during overall fermentation and reducing-sugar contents was reduced until the first mashing day, and increased from the day after. As for the alcohol content, that of the control was 6.87% on the first mashing day, and then gradually increased, nuruk-extract-treated rice began with 9~10% alcohol content and then increased as the fermentation proceeded. Among the organic acid contents, lactate was the main material. In the sensory evaluation, the 24 h-, 48 h- and 72 h- treated rice samples showed somewhat good response.

무증자 개량누룩 추출물을 흡착처리한 쌀을 이용한 막걸리의 온도변화와 품질특성을 분석 하였다. 술덧 발효 기간 중 대조구에 비해 누룩물처리쌀에서 전반적으로 낮은 품온을 유지하였고, 술덧발효 5일차부터 상승하는 양상을 보였다. 처리구 모두 효모, 젖산균, 초산균의 colony 수는 발효 초기 증가하다가 2일 이후부터 점차 감소하였다. pH는 발효 초기 낮았으나 발효가 진행됨에 따라 발효 3일차부터 상승하기 시작 하여 최종적으로는 초기보다 높은 양상을 보였다. 총산함량은 발효 1일차까지 급격히 증가하다가 그 이후에는 변화가 미미하였다. 전체적으로, 아미노산도와 가용성 고형분은 발효가 진행됨에 따라 증가 하였으며, 환원당은 발효 초기 낮아지다가 1일차부터 증가하였다. 알코올 함량은 대조구는 1일차에 6.87%로 시작하여 점차 증가하였으며, 이에 비해 누룩물처리쌀의 경우 1일차부터 9~11%로 높은 알코올 함량을 보이며 점차 증가하다가 발효 5일차이후에는 알코올 발효가 종료되었다. 최종 발효 후 술덧 내 유기산은 lactic acid가 주를 이루었다. 기호도평가에서는 24, 48, 72시간 누룩물처리쌀이 다른 처리구에 비해 맛과 전반적인 기호도에 있어서 우수한 평가를 받았다.

Keywords

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