Abstract
This study was carried out to investigate the antioxidative capacity of Ampelopsis brevipedunculata 95% ethanol extracts. The concentration of A. brevipedunculata extract at which DPPH radical scavenging activity was inhibited by 50% was 0.42 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 A. brevipedunculata extract at the concentrations of 0.1 and 1 mg/mL were 0.65 and 3.71 mM Trolox equivalents, respectively. Oxygen radical absorbance capacities of A. brevipedunculata extract at the concentrations of 5 and $100\;{\mu}g/mL$ were 22.75 and $131.25\;{\mu}M$ gallic acid equivalents, respectively. Superoxide scavenging activities of A. brevipedunculata extract at the concentrations of 0.1 and 1 mg/mL were 27.7 and 56.0%, respectively. Total phenolic contents of A. brevipedunculata extract at the concentrations of 0.5 and 2.0 mg/mL were 0.55 and 2.06 mM gallic acid equivalents, respectively. A. brevipedunculata extract at the concentration of 0.1 mg/mL inhibited 0.2 mM and 0.5 mM tert-butyl hydroperoxide induced cyototoxicity by 36.2 and 23.3%, respectively, in HepG2 cell culture system. Thus strong antioxidant and cytotoxicity-inhibiting effects of A. brevipedunculata 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 개머루덩굴 95% 에탄올추출물의 항산화 효과를 조사하였다. Pyrogallol의 억제율을 100%로 기준하였을 때, DPPH 라디칼을 50% 억제시키는데 필요한 개머루덩굴 추출물의 농도는 0.42 mg/mL이었다. 총항산화 활성은 ABTS 라디칼에 대한 항산화능으로 측정하였다. 개머루덩굴 추출물 0.1 및 1 mg/mL의 총항산화능은 각각 0.65 및 3.71 mM Trolox와 동등한 수준이었다. 개머루덩굴 추출물 5 및 $100\;{\mu}g/mL$의 peroxyl radical 소거능은 각각 22.75 및 $131.25\;{\mu}M$ gallic acid와 동등한 수준이었다. 개머루덩굴 추출물 0.1 및 1 mg/mL의 superoxide 소거능은 각각 27.7 및 56.0%이었다. 개머루덩굴 추출물 0.5 및 2 mg/mL의 총페놀 함량은 각각 0.55 및 2.06 mM gallic acid와 동등한 수준이었다. 또한, HepG2 세포주를 이용한 세포배양에서 개머루덩굴 추출물 0.1 mg/mL 농도의 첨가는 0.2 및 0.5 mM tert-butyl hydroperoxide로 유도된 세포독성을 각각 36.2 및 23.3% 감소시켰다. 따라서, 본 연구 결과들은 개머루덩굴 추출물의 강력한 항산화 효과와 세포독성 억제 효과를 나타내며, 이러한 효능은 적어도 자유라디칼의 산화 억제와 높은 총페놀 함량에 기인하는 것으로 사료된다.
