Korean Journal of Plant Resources (한국자원식물학회지)

The Plant Resources Society of Korea (한국자원식물학회)
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In vitro Antioxidant Activity of Sanguisorbae Radix Ethanol Extracts

지유 에탄올추출물의 생체외 항산화 활성

  • Rhim, Tae-Jin (Department of Animal Biotechnology in Division of Animal and Life Resources, Sangji University)
  • 임태진 (상지대학교 동물생명자원학부 동물생명공학전공)
  • Received : 2012.07.06
  • Accepted : 2012.10.29
  • Published : 2013.04.30
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Abstract

The objective of this study was to investigate the antioxidative capacity of ethanol extracts from Sanguisorbae officinalis L. root (Sanguisorbae radix) in vitro. The concentration of Sanguisorbae radix extract at which DPPH radical scavenging activity was inhibited by 50% was 0.33 mg/mL, which was similar to $IC_{50}$ of ${\alpha}$-tocopherol (0.40 mg/mL), as compared to 100% by pyrogallol as a reference. Total antioxidant status was examined by total antioxidant capacity against ABTS radical reactions. Total antioxidant capacities of Sanguisorbae radix extract were significantly (p<0.05) higher than those of ${\alpha}$-tocopherol. Superoxide scavenging activities of Sanguisorbae radix extract were significantly (p<0.05) higher than those of catechin. Oxygen radical absorbance capacities of Sanguisorbae radix extract were significantly (p<0.05) higher than those of ascorbic acid. Cupric reducing antioxidant capacities of Sanguisorbae radix extract were significantly (p<0.05) higher than those of ${\alpha}$-tocopherol. Sanguisorbae radix extract prevented supercoiled DNA strand breakage induced by hydroxyl radical and peroxyl radical. Total phenolic contents of Sanguisorbae radix extract at concentrations of 0.5 and 5 mg/mL were 0.50 and 3.33 mM gallic acid equivalents, respectively. Sanguisorbae radix extract at concentration of 0.01, 0.1 and 0.5 mg/mL inhibited 0.2 mM tert-butyl hydroperoxide-induced cytotoxicity by 33.8, 79.1 and 96.9%, respectively, in HepG2 cell culture system. Thus, strong antioxidant and cytotoxicity-ihnibiting effects of Sanguisorbae radix extract seem to be due to, at least in part, the prevention from free radicals-induced oxidation as well as high levels in total phenolic contents.

본 연구에서는 지유 에탄올추출물의 항산화 효과를 조사하였다. Pyrogallol의 억제율을 100%로 기준하였을 때, DPPH 라디칼을 50% 억제시키는데 필요한 지유 추출물의 농도는 0.33 mg/mL으로 ${\alpha}$-tocopherol의 $IC_{50}$(0.40 mg/mL)과 유사하게 나타났다. 지유 추출물의 총항산화능은 ${\alpha}$-tocopherol에 비해 높게 나타났다. 지유 추출물의 superoxide 소거활성은 catechin에 비해 높게 나타났다. 지유 추출물의 peroxyl 라디칼 소거활성은 ascorbic acid에 비해 높게 나타났다. 지유 추출물의 구리이온 환원력은 ${\alpha}$-tocopherol에 비해 높게 나타났다. 지유 추출물은 hydroxyl 라디칼 및 peroxyl 라디칼로 유발된 supercoiled DNA strand의 절단을 억제시켰다. 지유 추출물 0.5 및 5 mg/mL의 총페놀 함량은 각각 0.50 및 3.33 mM gallic acid와 동등한 수준이었다. 또한, HepG2 세포주를 이용한 세포배양에서 지유 추출물 0.01, 0.1 및 0.5 mg/mL 농도의 첨가는 0.2 mM t-BHP로 유도된 세포독성을 각각 33.8, 79.1 및 96.9% 감소시켰다. 따라서, 본 연구 결과들은 지유 추출물의 강력한 항산화 효과와 세포독성 억제효과를 나타내며, 이러한 효능은 적어도 자유라디칼의 산화억제와 높은 총페놀 함량에 기인하는 것으로 사료된다.

Keywords

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