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Antioxidative and Antiallergic Effect of Persimmon Leaf Extracts

감잎(Diospyros kaki Thunb) 추출물의 항산화 및 항알레르기 효과

  • 유기환 (수원대학교 생명과학과) ;
  • 정종문 (수원대학교 생명과학과)
  • Published : 2009.12.31

Abstract

The purpose of this study was to investigate the antioxidative and antiallergic effects of persimmon leaf extract. Antioxidative and anti-inflammatory effects of the crude persimmon leaf extract (PLE) and the partially purified persimmon leaf extract (PPLE) were determined in in vitro assays by using 1,1-diphenyl-2-picrylhydrazyl (DPPH) and superoxide anion radicals, and 5-lipoxygenase (5-LO) and cyclooxygenase (COX). Total phenols and total flavonoid levels of PLE and PPLE were $230.0{\pm}19.6$ mg/g and $475.5{\pm}38.7$ mg/g, and $34.8{\pm}6.5$ mg/g and $78.8{\pm}3.6$ mg/g, respectively. DPPH and superoxide radical-scavenging activities ($SC_{50}$) of the PLE and PPLE were $23.8{\pm}3.2$ ppm and $10.0{\pm}1.3$ ppm, and $47.6{\pm}3.4$ ppm and $22.4{\pm}3.3$ ppm, respectively. Inhibitory activities ($IC_{50}$) of PLE and PPLE against 5-LO, COX-1 and COX-2 were $77.1{\pm}11.7$, $38.6{\pm}7.0$ ppm, $47.4{\pm}7.7$, $25.3{\pm}6.3$ ppm, and $129.5{\pm}5.5$, $84.5{\pm}2.3$ ppm, respectively. Moreover, two extracts inhibited dose-dependently NO production in LPS-stimulated RAW 264.7 cells, and also effectively inhibited the cutaneous anaphylaxis reaction activated by anti-dinitrophenyl IgE antibody in mice. These results suggest that PLE and PPLE may be useful for phytochemical materials for prevention and treatment of radical-mediated pathological and allergy diseases.

본 연구에서는 현재까지 연구되어진 감잎 추출물(PLE)의 추출방법을 달리하고 그 추출물을 비 특이적 흡착 resin을 사용하여 부분 정제함으로서 추출물의 활성을 높이고자 하였으며 PLE와 PLE의 부문 정제물(PPLE)의 페놀성 화합물 및 플라보노이드 함량을 측정하였다. 또한 이들의 항산화제와 항알레르기 개선제로써의 유효성을 알아보기 위해 항산화 효과에 관여하는 DPPH 라디칼 포착효능, superoxide 음이온 라디칼 포착효능과 제Ⅰ형 알레르기 반응 억제 효능에 관여하는 5-LO억제 효능, COX억제효능, NO소거효능 및 수동피부아나필락시스 억제 효능(PCA)을 측정하였다. 그 결과 PLE와 PPLE의 페놀성 화합물은 각각 $230.0{\pm}19.6$ mg/g, $475{\pm}38.7$ mg/g이 함유되어 있었고, 플라보노이드는 각각 $34.8{\pm}6.5$ mg/g, $78.8{\pm}3.6$ mg/g 함유되어 있는 것으로 나타났다. 그리고 PLE와 PPLE이 각각 $23.8{\pm}63.2$ mg/g, $10.0{\pm}1.3$ mg/g의 농도에서 DPPH 라디칼을, $47.6{\pm}3.4$ ppm, $22.4{\pm}3.3$ ppm의 농도에서 superoxide 음이온 라디칼을 50% 소거하는 것으로 나타났다. PLE와 PPLE의 항알레르기 효능에 관하여 5-LO의 $IC_{50}$값이 각각 $77.1{\pm}11.7$ ppm, $38.6{\pm}7.0$ ppm으로 양성대조군인 EGCG의 $IC_{50}$($18.9{\pm}5.5ppm$)보다는 높았지만 PLE와 PPLE가 EGCG와 같은 단일물질이 아니라 천연혼합물임을 감안하였을 때 5-LO를 비교 적 낮은 농도에서 억제하고 있다고 볼 수 있다. 또한, COX-2의 선택적 저해율을 COX-1과 COX-2의 비율 비교를 통해 나타낸 결과 양성대조군으로 사용한 EGCG보다는 떨어지는 결과를 나타냈으나 다른 천연물과 비교하였을 때 COX-2를 상당히 선택적으로 저해하고 있음을 확인하였다. 마우스의 대식세포인 RAW 264.7 세포주를 사용하여 낮은 세포독성과 NO소거에도 우수한 효과가 있음을 확인하였고, 마우스를 이용하여 수동피부아나필락시스 반응 억제 효과도 확인하였다. 이상의 결과에 따르면, 감잎 추출물이 항산화 및 항알레르기 효능을 갖고 있어 알레르기성 비염이나 아토피와 같은 알레르기관련 질병 예방 및 개선 또는 건강식품 원료로서 유효하게 사용될 것이라 생각된다.

Keywords

References

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