쌀 품종에 따른 약주의 발효 및 품질 특성
Fermentation and Quality Characteristics of Yakju According to Different Rice Varieties
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초록
쌀 가공용 품종의 활용도 증진을 위해 일반계통 3종, 가공용계통 2종 및 태국산쌀 1종을 선택하여 양조 적성을 확인한 결과는 다음과 같다. 약주의 시료구별 pH는 일미벼와 한아름벼로 담금한 약주의 pH가 4.14와 4.07로 높았고, 총산 함량은 태국산쌀의 인디카 품종으로 담금한 약주의 총산 함량이 0.56%로 가장 높았다. 총 유리당 함량은 태국산 인디카 품종으로 담금한 약주가 1,822.38 mg%로 가장 높았고, 주요 유리당은 glucose이었다. 환원당 함량은 국내산 일반계통 품종과 가공용통 품종은 2.12～2.59%로 비슷하였으나, 태국산 인디카 품종은 3.59%로 다른 시료구에 비해 다소 높았다. ethanol 함량은 가공용 품종인 한아름벼를 이용해 담금한 약주가 19.14%로 가장 높았고, 태국산 인디카 품종으로 담금한 약주는 13.97%로 가장 낮았다. 약주의 향기성분은 총 21종의 향기성분이 검출되었고, 주요 향기 성분으로는 ethanol, acetic acid, 1-methyl-1-propanol이었다. 품종에 따른 약주의 관능검사 결과 향과 색은 가공용 품종인 한아름벼를 이용해 담금한 약주가 가장 좋은 기호도를 보였고, 맛에 대한 평가에서 단맛과 신맛은 가공용 품종인 안다벼를 이용해 담금한 약주가 6.0과 6.7로 가장 높은 기호도를 보였다. 쓴맛은 시료구별 유의적 차이를 보이지 않았고, 전체 기호도는 가공용 품종인 한아름벼와 안다벼를 이용해 담금한 약주가 일반계 품종인 일미벼, 호평벼 및 호품벼로 담금한 약주 보다 높았다.
Abstract
This study was performed to improve quality of traditional Yakju and compares quality of Yakju according to different rice cultivars. The pHs of Ilmi Yakju and Hanarum Yakju showed 4.14 and 4.07, respectively and the other Yakju's pHs were ranged from 3.92 to 3.98. The content of total acid of Yakju using Indica rice imported from Thailand was the highest among the samples. The major components of free sugar was glucose and the highest content of total free sugars was found in Indica Yakju. The content of reducing sugars in Yakju using Indica rice was the higher than other samples. The ethanol content of Hanarum Yakju showed higher than those Yakju's and the lowest ethanol content found for the indica Yakju. The volatile compounds from the rice Yakju were identified by GC-MS. Twenty-one volatile compounds were found in rice Yakju. And the major volatile compounds were ethanol, acetic acid, 1-methyl-1-propanol, 2-methyl-butane, 3-methyl-1-butanol, iso-amylalcohol and 1-hexanol from Yakju. As the result of sensory test, higher scores for smell and color were found for the Yakju used Hanarum Yakju. The highest score sweat and acid were found for the Anda rice Yakju in sensory test. The result of sensory evaluation indicated that Hanarum Yakju and Anda Yakju were better than the other samples, and the value of bitterness was no significant in this test.
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