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로스팅 온도에 따른 쥐눈이콩(Rhynchosia nulubilis)의 성분 분석 및 항산화 활성

Physicochemical Composition and Antioxidative Activities of Rhynchosia nulubilis according to Roasting Temperature

초록

본 연구에서는 쥐눈이콩을 골질환 저감화를 위한 커피 대체 음료의 원료로 사용하기 위해 쥐눈이콩을 커피와 유사한 조건으로 로스팅 하였고, 로스팅으로 인한 영양소 함량 및 생리활성에 변화를 주는지 여부를 알아봄으로써 최적의 로스팅 조건을 알아보고자 하였다. 로스팅 온도범위와 시간은 선행 예비실험 결과를 참조하여 온도는 $90^{\circ}C$에서 $120^{\circ}C$ 범위로 한정하고 시간은 20분으로 고정시켰다. 온도별 로스팅 쥐눈이콩 시료의 일반성분 분석결과, 수분 함량만이 로스팅 온도가 높아질수록 감소하는 경향을 나타내었을 뿐 다른 일반성분 함량은 로스팅 온도의 영향을 받지 않은 것으로 나타났다. 로스팅 쥐눈이콩 시료의 DPPH법, ABTS법에 의한 free radical 소거능은 로스팅 온도가 높아질수록 활성이 증가하였다. 총 폴리페놀과 총 플라보노이드 함량 역시 로스팅 온도가 높아질수록 증가하였다. 로스팅 쥐눈이콩 시료의 DPPH법과 ABTS법을 통한 항산화 능력과 총 페놀 및 총 플라보노이드 함량 그리고 isoflavone 함량과의 상관관계를 분석한 결과, 총 페놀 및 총 플라보노이드 함량은 항산화 활성과 밀접한 상관성을 보여주었다. 또한 이소플라본 함량은 총 페놀 및 총 플라보노이드 함량과도 높은 정의 상관관계를 나타냈다. 정리해보면 $110^{\circ}C$, $120^{\circ}C$에서 20분 동안 쥐눈이콩을 로스팅 할 경우 열처리가 생리활성 효과를 증진시킴을 알 수 있었다. 추후 후속연구로 본연구의 쥐눈이콩 최적 로스팅 조건을 이용해서 커피 대체 음료를 제조한다면 기존의 콩음료의 콩비린내를 감소시킴으로써 커피시장에서 소비자의 호응도가 높은 골질환 저감화 커피 대체 음료로 자리매김할 수 있을 것으로 기대된다.

Abstract

This study was conducted to determine the optimal roasting temperature (90, 100, 110, and 120; fixed time of 20 minutes) of small black coffee beans under various roasting conditions. The roasting temperature range and fixed time were the same as our preceding study. After roasting, the general composition, isoflavone contents, and antioxidant activities were measured. As the results of the proximate composition analysis of small black beans according to roasting conditions, only moisture decreased among them, whereas other general compositions were not affected. The DPPH and ABTS radical scavenging activities were the highest at a roasting temperature of $120^{\circ}C$. Total polyphenol and total flavonoid contents were also highest at $120^{\circ}C$. Isoflavone contents showed a positive correlation with DPPH and ABTS radical scavenging activities, as well as total phenol and flavonoid contents. These results suggest that the optimal roasting conditions of small black beans were determined to be $120^{\circ}C$ for 20 minutes.

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