Korean Journal of Food Science and Technology (한국식품과학회지)

Korean Society of Food Science and Technology (한국식품과학회)
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Characteristics of Microwave-assisted Extraction for Catechins from Grape Seed

포도씨 카테킨류의 마이크로웨이브 추출특성

  • Lee, Eun-Jin (Korea Food & Drug Administration) ;
  • Choi, Sang-Won (Department of Food Science and Nutrition, Catholic University of Daegu) ;
  • Kim, Hyun-Ku (Korea Food Research Institute) ;
  • Kwon, Joong-Ho (Department of Food Science and Technology, Kyungpook National University)
  • Published : 2008.10.31
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Abstract

Microwave energy was applied to the extraction of functional catechins from grape seed. The solvent, absolute ethanol, reached the boiling point when exposed for less than 3 min microwave treatment at 100 W. The effects of independent variables in microwave-assisted extraction (MAE), including microwave power (0-160W, $X_1$), ethanol concentration (0-100%, $X_2$) and extraction time (1-5 min, $X_3$), were investigated on each response variable ($Y_n$), and the contents of catechin and its derivatives were determined via response surface methodology, thereby allowing us to predict their optimal extraction conditions. The predicted maximal values of (+)-catechin, procyanidin $B_2$, (-)-epicatechin, and (-)-epicatechin gallate were 137.99, 72.78, 222.38, and 9.59 mg%, respectively, under different MAE conditions. The predicted extraction conditions for maximum catechin responses were as follows: 104.10 W of microwave power, 45.35% of EtOH, and 4.89 min of extraction time for (+)-catechin (137.99 mg%), 133.16 W, 46.16% and 4.49 min for procyanidin $B_2$ (72.78 mg%), 136.00 W, 41.37% and 4.39 min for (-)-epicatechin (222.38 mg%), 143.20 W, 37.51% and 1.88 min for (-)-epicatechin gallate (9.59 mg%), respectively. The contents of (+)-catechin, procyanidin 1B2 and (-)-epicatechin in MAE were similarly influenced by three independent variables, whereas (-)-epicatechin gallate was influenced less profoundly by ethanol concentration and extraction time.

포도씨에 함유된 기능성 카테킨류를 효과적으로 추출하기 위해서 마이크로웨이브 에너지를 이용하였다. 에탄올의 마이크로웨이브 가열특성을 확인하였을 때 100W에서 3분 이내에 끓는점에 도달하였다. 중심합성계획에 따라 추출조건(microwave power 0-120W, 에탄올 농도 0-100%, 추출시간 1-5분)을 설계하고, 조건별 추출물의 카테킨류 함량을 회귀분석함으로써 최적 추출조건을 예측하였다. (+)-Catechin의 최적 추출조건은 microwave power 104.10W, 에탄올 농도 45.35%, 추출시간 4.89분으로, 예측된 정상점은 최대점을 보이면서 최대 추출 값이 137.99 mg%였다. Procyanidin $B_2$의 최적 추출조건은 133.16W, 46.16%, 4.49분이며, 최대 추출 값은 72.78 mg%으로 예측되었다. 또한 (-)-epicatechin은 136.00W, 41.37%, 4.39분에서 최대 222.38 mg%를 추출할 수 있으며, (-)-epicatechin gallate는 143.20W, 37.51% 및 1.88min에서 9.59mg%를 추출할 수 있는 것으로 예측되었다. 이때 (+)-catechin, procyanidin $B_2$ 및 (-)-epicatechin은 microwave power, 에탄올 농도, 추출시간 등 3가지 독립변수에 모두 유사하게 영향을 받았지만, (-)-epicatechin gallate는 microwave power에만 주로 영향을 받는 것으로 나타났다.

Keywords

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