Korean Journal of Food Science and Technology (한국식품과학회지)

Korean Society of Food Science and Technology (한국식품과학회)
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Effect of Reflux Conditions on Extraction Properties and Antioxidant Activity of Freeze Dried-Schisandra chinensis

열수추출조건이 동결건조 오미자의 추출 및 항산화 특성에 미치는 영향

  • Park, Eun-Joo (School of Food Science & Biotechnology, Kyungpook National University) ;
  • Ahn, Jae-Jun (School of Food Science & Biotechnology, Kyungpook National University) ;
  • Kwon, Joong-Ho (School of Food Science & Biotechnology, Kyungpook National University)
  • Received : 2013.04.22
  • Accepted : 2013.08.26
  • Published : 2013.10.31
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Abstract

Reflux extraction properties of Schisandra chinensis were investigated with different extraction conditions of ethanol concentration (0-99%), extraction time (2-8 h), and extraction temperature ($40-100^{\circ}C$). Different chemical properties, such as reducing sugars (RS), titratable acidity (TA), Hunter's color values, total phenolic compounds (TPC), and antioxidant activity (DPPH and ABTS assays) were analyzed for the corresponding extracts. The results showed that RS and TA increased as the extraction temperature increased. For each parameter, the maximum value was achieved, when extraction was carried out with 50% ethanol for 8 h at $100^{\circ}C$. Redness ($a^*$) of the extract decreased as all 3 extraction parameters were increased. TPC increased significantly as the extraction time and temperature increased; further, the highest TPC was achieved, when extraction was carried out with 50% ethanol. The same tendency was observed for DPPH and ABTS radical scavenging activities. The highest TPC and antioxidant activity were obtained, when extraction was carried out with 50% ethanol for 4-6 h at $60-80^{\circ}C$, respectively.

오미자 유효성분의 식품 소재화를 위한 기초 자료를 얻기 위해 물과 에탄올을 이용하여 에탄올 농도(%), 추출온도($^{\circ}C$), 추출시간(h)을 달리한 추출물의 이화학적 특성과 항산화 작용을 확인하였다. 환원당 함량은 추출온도가 증가할수록 증가하였고 에탄올 농도는 50%, 추출시간은 4시간 추출하였을 때 높은 함량을 나타내었다. 산도는 에탄올 농도 50%, 추출시간 8시간, 추출온도 $100^{\circ}C$일 때 가장 높은 적정 산도를 나타내었다. 색도는 명도($L^*$)는 추출온도, 추출시간이 증가할수록 감소하는 것을 알 수 있었고, 오미자의 주 색상인 적색도($a^*$)는 에탄올 농도, 추출온도, 추출시간이 증가할수록 감소하는 경향을 보였다. 총 폴리페놀 함량은 50% 에탄올 추출물에서 가장 높은 함량을 나타내었고 추출시간과 온도가 증가할수록 유의적으로 증가하였다. 이와 같은 경향은 DPPH 및 ABTS 라디칼 소거능에서도 유사한 경향을 나타내었다. 각 추출조건별 실험 인자들의 상관성을 분석한 결과, 에탄올 농도는 총 페놀 및 ABTS 항산화능과 매우 높은 상관성을 나타내었다. 추출시간과 온도에 따른 총 페놀함량은 DPPH 및 ABTS 항산화능, 환원당 함량, 적색도, 적정산도에서 강한 상관관계를 나타내었고, 각 실험 항목 사이에서도 모두 높은 상관성을 나타내었다. 이상의 결과로 볼 때 오미자의 최적 추출조건은 용매는 50% 에탄올, 추출시간 4-6시간, 추출온도는 $60-80^{\circ}C$의 조건이 가장 바람직하다고 사료된다.

Keywords

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