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Quality Characteristics and Antioxidant Effects during Makgeolli Fermentation by Purple Sweet Potato-rice Nuruk

자색고구마-쌀누룩으로 제조된 막걸리 발효 중 품질 특성과 항산화 효과

  • Cho, Hyeon Kook (Farming Corporation OrumJooga Winery) ;
  • Lee, Ju Young (Farming Corporation OrumJooga Winery) ;
  • Seo, Weon Taek (Department of Food Science, Gyeongnam National University of Science and Technology) ;
  • Kim, Myung Kyu (Department of Mechanicla Engineering, Gyeonam National University of Science and Technology) ;
  • Cho, Kye Man (Department of Food Science, Gyeongnam National University of Science and Technology)
  • 조현국 (영농조합법인 오름주가) ;
  • 이주영 (영농조합법인 오름주가) ;
  • 서원택 (경남과학기술대학교 식품과학부) ;
  • 김명규 (경남기술과학대학교 기계공학과) ;
  • 조계만 (경남과학기술대학교 식품과학부)
  • Received : 2012.04.28
  • Accepted : 2012.08.17
  • Published : 2012.12.31

Abstract

Makgeolli is the oldest Korean traditional wine made from rice, and contains 6-8% alcohol. Also, nuruk is traditionally prepared by exposing moistened ground wheat or rice to the air, and there contained airborne microorganism. In this study, purple sweet potato (PSP) was used as a raw material in the rice nuruk- and makgeolli-making processes. PSP rice nuruk (RN) was made with rice and 0-10% (w/w) PSP, and the characteristics of makgeolli were studied during fermentation. The pH during fermentation decreased from 4.27 (0% PSP-RN), 4.59 (2.5%), 4.50 (5.0%), 4.46 (7.5%), and 4.43 (10.0%) of initial fermentation day to 4.12, 3.82, 3.67, 3.71, and 3.66, respectively, at day 7. The sugar contents increased from $0.4^{\circ}Bx$ of the initial day to $8.0-8.4^{\circ}Bx$, and the levels of alcohol increased to 13.0% (0% PSP-RN), 13.2% (2.5%), 12.8% (5.0, 7.5, and 10.0%) by day 7, respectively. In addition, the contents of soluble anthocyanins and phenolics increased from 0.001-0.121 and 0.2-0.27 g/L on the initial fermentation day to 0.002-0.166 and 1.65-1.87 g/L, corresponding to increases in levels of antioxidant activities of 20-50%, respectively.

막걸리는 한국 전통주로 쌀로부터 알코올 함량 6-8%로 발효시킨 술이다. 누룩은 분쇄된 밀 혹은 쌀에 물을 가하고 성형하여 자연의 미생물로 번식시킨 발효제이다. 본 연구에서는 기능성이 밝혀져 있는 자색고구마를 첨가하여 쌀누룩을 제조하고 이 누룩을 이용하여 막걸리를 제조하였다. 자색고구마-쌀누룩(PSP-RN)은 PSP를 0-10%로 쌀에 첨가하여 제조하였고 막걸리 발효 과정 중 품질 특성과 항산화 효과를 확인하였다. 막걸리 발효 중 pH는 발효 초기 각각 4.27(0% PSP-RN), 4.59(2.5%), 4.50(5.0%), 4.46(7.5%) 및 4.43(10.0%)에서 발효 종기 4.12, 3.82, 3.67, 3.71 및 3.66로 감소하였다. 당도는 발효 초기 $0.4^{\circ}Bx$에서 $8.0-8.4^{\circ}Bx$로 증가하였고 알코올 함량은 발효 종기 13.0%(0% PSP-RN), 13.2% (2.5%) 및 12.8%(5.0-10.0%)로 증가하였다. 한편, 수용성 anthocyanin과 phenolics 함량은 발효 초기 각각 0.001-0.121 g/L와 0.2-0.27 g/L에서 발효 종기 0.002-0.166 g/L와 1.65-1.87 g/L로 증가하였고 이에 상응하여 항산화 활성은 20-50% 증가하였다.

Keywords

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