커피 볶음 정도에 따른 생화학적 성분 및 생리활성의 변화
Changes of biochemical components and physiological activities of coffee beans according to different roasting conditions
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4종류의 커피 원두(CS, Colombia superimo; EY, Ethiopia yirgacheffee; IM, Indonesia mandheling; IMM, India monsooned malabar AA)를 생두(raw coffee bean)와 각각 다른 온도(200, 250℃)와 시간(10, 15, 20 min)으로 로스팅하였으며, 최적의 로스팅 조건을 찾기 위하여 로스팅 중에 변화되는 pyrazine을 비롯한 몇 가지 성분과 항산화, 항당뇨 효과를 조사하였다. Caffeine 함량은 로스팅 정도에 따라 크게 차이를 보이지 않았으나, 5-caffeoylquinic acid와 total phenolic compounds는 대체로 로스팅이 강해질수록 크게 감소하였다. Pyrazine 화합물은 IMM에서 가장 많이 생성되었으며, 250℃에서는 시간이 경과할수록 급격히 줄어들었다. DPPH 라디칼 소거활성은 같은 처리농도에서의 BHT와 α-tocopherol의 활성에 비하여 대부분 80% 이상의 효과를 나타내었다. 한편 FRAP assay에서는 로스팅 정도가 강해질수록 활성이 약간 감소하였다. α-Glucosidase 저해활성은 유의할 만한 수준이었으나, 250℃에서 20분 roasting할 경우에는 활성이 80% 이상 줄어들었으며, α-amylase 저해활성도 유사한 경향이었다. 이러한 결과로 로스팅 정도에 따른 생리활성과 커피의 고소한 향과 초콜릿 향을 내는 pyrazine 화합물의 생성을 종합적으로 보았을 때, 200℃에서 15분정도 로스팅하는 것이 가장 최적의 조건인 것으로 판단하였다. 따라서 이러한 결과는 커피산업에서 로스팅 조건을 달리한 원두커피의 향과 생리활성이 높은 커피를 생산하는데 활용될 수 있을 것이라 기대된다.
Abstract
Four different kinds of coffee beans (CS, Colombia supremo; EY, Ethiopia yirgacheffee; IM, Indonesia mandheling; and IMM, India monsooned malabar) were roasted at 200 and 250℃ for 10, 15, and 20 min. To determine the optimum roasting conditions, various components of the coffee beans such as pyrazines produced during the roasting, and their antioxidant and antidiabetic effects were analyzed. The different roasting condition did not affect on the concentration of caffeine. However, the amount of 5-caffeoylquinic acid and the total phenolics decreased significantly, at a greater temperature and a longer roasting time. The greatest amount of pyrazines was produced from the IMM however, the amount of pyrazines decreased rapidly at 250℃ according to increasing in roasting time. The DPPH free radical scavenging activity was mostly 80% more effective than that of BHT and α-tocopherol activities at the same concentration. In the case of the FRAP assay, the reducing power of the coffee slightly decreased at a greater temperature pand longer time. While the inhibitory effect on α-glucosidase was negligible, the activity decreased by more than 80% when the coffee beans were roasted at 250℃ for 20 min. The inhibitory effect on α-amylase showed similar results. Taken together, the optimum roasting conditions were determined to be 200℃ and 15 min, which provided the best physiological activity and nutty and chocolatey aromas from the pyrazine of coffee.
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