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Effect of Milling Degree on the Physicochemical and Sensory Quality of Sogokju

도정도에 따른 소곡주의 품질 및 기호도 변이

  • Chun, A-Reum (National Institute of Crop Science, Rural Development Administration) ;
  • Kim, Dae-Jung (National Institute of Crop Science, Rural Development Administration) ;
  • Yoon, Mi-Ra (National Institute of Crop Science, Rural Development Administration) ;
  • Oh, Sea-Kwan (National Institute of Crop Science, Rural Development Administration) ;
  • Choi, Im-Soo (National Institute of Crop Science, Rural Development Administration) ;
  • Hong, Ha-Cheol (National Institute of Crop Science, Rural Development Administration) ;
  • Kim, Yeon-Gyu (National Institute of Crop Science, Rural Development Administration)
  • 천아름 (농촌진흥청 국립식량과학원) ;
  • 김대중 (농촌진흥청 국립식량과학원) ;
  • 윤미라 (농촌진흥청 국립식량과학원) ;
  • 오세관 (농촌진흥청 국립식량과학원) ;
  • 최임수 (농촌진흥청 국립식량과학원) ;
  • 홍하철 (농촌진흥청 국립식량과학원) ;
  • 김연규 (농촌진흥청 국립식량과학원)
  • Received : 2011.07.18
  • Accepted : 2011.12.29
  • Published : 2012.01.31

Abstract

Sogokju, a Korean glutinous rice wine and one of the oldest Korean traditional wines, is famous for its unique taste acquired from a 100-day incomplete fermentation process. This study investigated the effects of the degree of rice milling on the physicochemical and sensory characteristics of Sogokju. It evaluated the physicochemical characteristics, pasting and color properties, and structural properties of starch using four different degrees of milled rice (Oryza sativa L.) cultivar Dongjinchalbyeo. Samples of brown rice with milling yields of 92%, 84%, 76%, and 68% were produced using both abrasive and friction whiteners. This study showed that the protein, lipid, and ash content of milled rice decreased as the degree of milling increased. The lower hardness of the kernel below milling yield 92% suggested that milling may be related to the lower protein content of the kernel. The pasting curve showed a significant increase in viscosity properties as the degree of milling increased. This is due to the decrease in protein and lipid content, the increase in starch content, and the difference in amylopectin chain-length distribution. Further milling of white rice, based on 92% milling yield, had an effect on the amylopectin chain-length distribution due to the degree of polymerization (DPn) of 37~60. The long chain of amylopectin also contributed to the viscosity. The increase in the degree of milling decreased the glucose and total sugar content of Sogokju. However, it increased the total acidity of Sogokju. Moreover, the lightness of Sogokju decreased while its yellowness increased. These results indicate that the degree of milling can alter the taste and color of Sogokju. The sensory evaluation showed that the increase in the degree of milling decreased consumer preference for Sogokju. The sensory score for Sogokju was positively correlated with its brix degree, glucose content, pH, and protein content of raw rice.

한국 전통주인 '한산 소곡주'의 품질 연구를 위해 원료인 찰벼의 도정 정도에 따른 주질 특성을 살펴보았다. 소곡주의 원료로 주로 사용되는 동진찰벼를 현미 중량을 기준으로 92%(10분도), 84%(20분도), 76%(30분도), 68%(40분도) 수준으로 도정하여 소곡주를 제조하여 그 원료곡과 소곡주의 품질 특성과 그에 따른 기호도 변화를 분석하였다. 먼저 원료곡의 품질 특성은 도정도가 증가할수록 단백질, 지방 및 회분 함량이 급격히 감소하였으며 색 및 형태적인 변화를 수반하였고, 이는 기존의 보고와 일치하는 결과였다. 도정도에 따른 수분함량의 차이는 없었으며, 10분도를 제외하고는 물리적인 경도 차이도 나타나지 않아, 10분도 이상 시료의 경도 감소는 주로 단백질 함량의 감소와 연관된 것으로 판단되었다. 호화특성 또한 도정도가 증가할수록 전체적인 점성이 증가하는 양상을 뚜렷이 보임을 알 수 있었다. 이는 일차적으로 호화를 억제하는 단백질, 지방 성분들의 감소에 따른 것으로 판단되었으며, 이차적으로 아밀로펙틴 분지 구조가 도정도 증가에 따라 중쇄는 증가하고 장쇄는 감소하는 변화를 나타내어 이에 따른 영향이 있을 것으로 추정되었다. 도정도에 따른 소곡주 품질은 먼저 전분함량의 증가에 따라 제조수율이 증가하였으며, 알코올 함량의 유의한 차이는 없었으나, 당도와 유리당 함량이 감소하고 총 산도는 증가하여 단맛이 감소하고 신맛이 증가함을 확인할 수 있었다. 색 특성도 20분도 이상부터 명도는 감소하고 황색도가 증가하는 경향이 뚜렷하였으나 소곡주 색 특성에 대한 연구가 전무하여 관련 연구가 필요할 것으로 판단되었다. 도정도별로 소곡주의 소비자 기호도 검사를 실시한 결과 원료곡의 도정도가 증가할수록 소곡주의 소비자 기호도가 떨어지는 것으로 나타났다. 또한 소비자 기호도와 도정도에 따른 소곡주 품질의 상관관계 분석 결과, 소비자 기호도가 소곡주의 당도 및 포도당 함량, pH 및 원료곡의 단백질 함량과 상관관계를 나타내어, 원료곡 도정에 따른 소곡주 고유의 달고 풍부한 맛의 감소가 낮은 소비자 기호도의 원인인 것으로 판단되었다.

Keywords

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