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자귀나무(A. julibrissin) 수피 추출물의 생리활성

The Physiological Activities of Bark Extract of Albizia julibrissin

  • 투고 : 2010.09.03
  • 심사 : 2011.01.07
  • 발행 : 2011.02.28

초록

한방생약재로 사용되고 있는 자귀나무 수피를 천연 항산화제 및 기능성 식품이나 제품을 개발하기 위한 연구의 일환으로 자귀나무 수피를 물을 용매로 $80^{\circ}C$$110^{\circ}C$의 고온에서 추출된 물 추출물(AW)과 열수 추출물(AHW) 그리고 70% 에탄올을 용매로 $60^{\circ}C$에서 추출된 에탄올 추출물(AE)에 대한 생리활성 물질의 함량과 효과를 측정하였다. 자귀나무 수피의 열수 추출물인 AHW에서 가장 많은 8.57 mg/g의 플라보노이드와 108.67mg/g의 폴리페놀 화합물을 함유하였다. SOD 유사활성은 1.0 mg/mL의 농도에서 10.46~16.73%였으며, 아질산염 소거능은 pH 1.2의 조건에서 49.86~60.82%로 AHW에서 가장 높은 소거효과를 보였으며 $IC_{50}$$770.18\;{\mu}g$/mL였다. DPPH를 이용한 전자공여능 측정 결과에서는 0.3 mg/mL의 농도에서 AHW가 92.30%로 가장 우수한 활성을 보였으나, $IC_{50}$은 AW($31.31\;{\mu}g$/mL)와 AHW($36.22\;{\mu}g$/mL)가 ascorbic acid ($39.10\;{\mu}g$/mL)보다 낮은 농도에서 50%의 전자공여능을 나타내었다. XO에 대한 저해효과를 측정한 결과에서도 AHW가 94.05%의 저해율와 127.78 ug/mL의 $IC_{50}$ 농도를 나타내었다. 이상의 결과 합환피 한약재명으로 사용되고 자귀나무 수피는 물을 용매로 $110^{\circ}C$에서 추출된 열수 추출물(AHW)이 세가지 추출물 중 가장 많은 플라보노이드와 폴리페놀 화합물을 함유하며, 생리활성 효과에서도 우수하며 특히 전자공여능은 낮은 농도에서도 ascorbic acid보다 높은 활성을 나타내어 자귀나무 수피는 천연 생리활성 물질로서 식품과 기능성 제품에 활용 가능성이 있는 약용식물자원으로 생각된다.

Three bark extracts of Albizia julibrissin were prepared using water (AW), 70% (v/v) ethanol (AE), and hot water (AHW). Organic solvent fractions were analyzed for total flavonoids and polyphenols, antioxidant activities, and inhibitory activities against xanthine oxidase. Total flavonoid and polyphenol contents of the AHW extract were 8.57 mg/g and 108.67 mg/g, respectively. The SOD-like activities of all extracts, assayed at 1.0 mg/mL, were 10.46-16.73%. The nitrite-scavenging ability of the AHW extract, assayed at pH 1.2, was 60.82%, and the $IC_{50}$ value was $770.18\;{\mu}g$/mL. The electron-donating ability of the AHW extract, at 0.3 mg/mL, was 92.30%; the $IC_{50}$ values of the AW and AHW extracts were $31.31\;{\mu}g$/mL and $36.22\;{\mu}g$/mL, respectively; thus higher than that of ascorbic acid ($39.06\;{\mu}g$/mL). Xanthine oxidase inhibition by the AHW extract, at 1.0 mg/mL, was 94.05%. These results indicate that the AHW of A. julibrissin has potential as a natural antioxidant, for addition to foods and nutraceuticals.

키워드

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