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Quality Characteristics of Makgeolli Added with Kiwifruit (Actinidia deliciosa)

키위를 첨가한 막걸리의 품질특성

  • Kim, Eunkyung (Dept. of Culinary Science and Food Service Management, Kyung Hee University) ;
  • Chang, Yoon Hyuk (Dept. of Food and Nutrition, Kyung Hee University) ;
  • Ko, Jae Youn (Dept. of Culinary Science and Food Service Management, Kyung Hee University) ;
  • Jeong, Yoonhwa (Dept. of Food Science and Human Nutrition, Dankook University)
  • 김은경 (경희대학교 조리외식경영학과) ;
  • 장윤혁 (경희대학교 식품영양학과) ;
  • 고재윤 (경희대학교 조리외식경영학과) ;
  • 정윤화 (단국대학교 식품영양학과)
  • Received : 2013.07.01
  • Accepted : 2013.08.05
  • Published : 2013.11.30

Abstract

This study was conducted to investigate the physicochemical and microbial properties of Makgeolli supplemented with kiwifruit (Actinidia deliciosa). Four hundred grams of kiwifruit were added to 3.1 L of distilled water, followed by 2.0 kg of rice, 40.0 g of Nuruk, and 14.0 g of yeast. The mixed rice solution was then fermented at $28^{\circ}C$ for 6 days to prepare the kiwifruit Makgeolli. The pH values of the kiwifruit Makgeolli decreased from 5.31 to 4.37, but the total acidity values increased from 0.05 to 0.34% during fermentation. The total viable cells ($3.18{\times}10^7$ and $2.88{\times}10^7$, respectively), lactic acid bacteria ($1.51{\times}10^6$ and $1.50{\times}10^6$, respectively), and yeast counts ($1.96{\times}10^7$ and $1.90{\times}10^7$, respectively) of the kiwifruit Makgeolli and control were similar throughout the fermentation process. Glucose was the major free sugar in the control and kiwifruit Makgeolli and significantly decreased during fermentation. Succinic acid was the highest organic acid in both the control (24.6 mg/mL) and kiwifruit Makgeolli (26.3 mg/mL). In a volatile compound analysis, 3-methyl-1-butanol, 2-methyl-1-propanol and ethyl acetate were the major volatile compounds in the kiwifruit Makgeolli.

본 연구에서는 키위를 첨가하여 제조한 막걸리의 품질특성을 조사하였다. 발효 6일째의 키위 막걸리와 대조군 알코올 함량은 각각 16.6, 17.0%을 나타내어 시료 간 유의적인 차이가 없었다. 키위 막걸리와 대조군의 pH는 발효 1일째 급감한 후 완만한 증가를 보이고 발효 6일째 각각 4.38 및 4.51로 큰 차이가 없었으며, 총산은 발효 1일째 급격한 증가를 보인 후 완만히 증가하여 발효 6일째 각각 0.34 및 0.27을 나타내었다. 총 균, 유산균, 효모 수는 발효가 진행됨에 따라 점차 증가하였으며 키위 막걸리의 발효 6일째 총 균, 유산균, 효모 수는 대조군과 큰 차이를 나타내지 않았다. 색도(L, a, b)는 발효가 진행됨에 따라 대조군과 키위 막걸리 모두 증가하는 경향을 보였다. 유리당 중 가장 높은 함량을 보인 glucose는 발효가 진행되면서 유의적으로 감소하였고, 유기산 중 succinic acid 함량이 대조군과 키위 막걸리 모두 가장 높았고 발효가 진행됨에 따라 유의적으로 증가하였다. 키위 막걸리에서는 37종의 휘발성 화합물이 검출되었으며, 그중 3-methyl-1-butanol(33.71%), 2-methyl-1-propanol(23.81%) 및 ethyl acetate(19.94%)의 함량이 가장 높았다. 본 연구 결과 막걸리 제조 시 키위의 첨가는 막걸리의 품질특성에 부정적인 영향을 미치지 않는 것으로 평가되어, 키위의 영양학적 효용성을 겸비한 기능성 막걸리의 제조가 가능한 것으로 사료된다.

Keywords

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