Korean Journal of Food Science and Technology (한국식품과학회지)

Korean Society of Food Science and Technology (한국식품과학회)
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Physicochemical Properties and Composition of Ginsenosides in Red Ginseng Extract as Revealed by Subcritical Water Extraction

아임계수 추출에 의한 홍삼 추출물의 진세노사이드 조성 및 이화학적 특성

  • Lee, Joo-Mi (Research and development center, Woongjin Foods Co., Ltd.) ;
  • Ko, Min-Jung (Department of Food Science and Engineering, Ewha Womans University) ;
  • Chung, Myong-Soo (Department of Food Science and Engineering, Ewha Womans University)
  • 이주미 (웅진식품(주) 중앙연구소) ;
  • 고민정 (이화여자대학교 식품공학과) ;
  • 정명수 (이화여자대학교 식품공학과)
  • Received : 2015.10.02
  • Accepted : 2015.12.11
  • Published : 2015.12.31
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Abstract

Red ginseng was treated by subcritical water extraction (SWE) whose two parameters were the extraction temperature ($105-150^{\circ}C$) and time (5-20 min) under a high pressure. The oBrix value, solid content, color difference, and turbidity of the red ginseng extract increased with increasing extraction time and temperature, while the pH decreased. The total concentration of ginsenosides in the red ginseng extract was maximal at $120^{\circ}C$ and 20 min. The concentrations of ginsenosides Rg3 and Rh1 were maximal at $150^{\circ}C$ and 15 min. The concentrations of Rg3 and Rh1 were respectively 3.5-5 times and 2-2.5 times higher than those treated by conventional extraction methods with hot water, ethanol, and methanol. SWE is a particularly effective method for the selective extraction of less-polar ginsenosides such as Rg3 which is well known to exert strong anticancer effects.

홍삼의 신규 추출 방법으로 아임계수 추출(subcritical water extraction, SWE)을 적용하여 홍삼 추출물의 이화화적 특성 및 진세노사이드 추출 특성을 조사함으로써 최적 아임계수 추출 조건을 결정하고 기존 추출 방법과 비교함으로써 산업적 이용 효율을 평가하였다. 아임계수 추출에 의한 홍삼 추출물의 당도, 고형분 함량, 색차 및 탁도는 추출 온도가 높아지고 추출 시간이 길어질수록 증가하였고 pH는 낮아졌으며, 조 사포닌은 $120^{\circ}C$, 20분에서 최대였다. TLC 및 HPLC 분석 결과, 총 및 극성 진세노사이드 농도는 $120^{\circ}C$, 20분에서 최대였고 홍삼 특유의 저극성 진세노사이드 Rg3, Rh1 등은 $150^{\circ}C$, 15분에서 최대 농도였다. 또한 최적 아임계수 추출과 열수, 에탄올 및 메탄올을 용매로 환류 냉각 추출하여 비교한 결과, 저극성 진세노사이드의 추출 이행률은 $150^{\circ}C$, 15분의 아임계수 추출에서 가장 높았고 특히 Rg3는 3.5-5배, Rh1은 2-2.5배의 높은 농도로 나타났다. 홍삼의 특이 사포닌으로 극미량 존재하는 Rg3 및 Rh1은 강력한 항암 효과 등이 보고되면서 최근 화학적, 물리적, 생물학적 방법에 의한 전환연구가 활발히 진행되고 있으나 낮은 선택성과 생산성의 저하, 부 반응으로 인한 환경 공해 및 대량 생산의 한계 등으로 산업적 적용에 제약이 존재하여 왔다. 본 연구에서는 아임계 상태에서의 물의 특성 변화를 이용한 아임계수 추출을 적용하여 홍삼으로부터 특히 저극성 진세노사이드의 선택적 추출 및 전환에 효과적인 대체 기술로서 가능성을 확인하였다.

Keywords

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