만병초(Rhododendron brachycarpum) 추출물의 항산화 효과
The Antioxidative Effects of Rhododendron brachycarpum Extracts
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본 연구에서는 만병초 95% 에탄올추출물의 항산화 효과를 조사하였다. 총항산화 활성은 ABTS 라디칼에 대한 항산화능으로 측정하였다. 만병초 추출물 0.2 및 1 mg/mL의 총항산화능은 각각 0.33 및 2.26 mM Trolox와 동등한 수준이었다. 만병초 추출물 0.2 및 1 mg/mL의 superoxide 소거능은 각각 45.0 및 77.0%이었다. 만병초 추출물 5 및 100 μg/mL의 산소라디칼 소거능은 각각 40.88 및 131.00 μM Trolox와 동등한 수준이었다. 만병초 추출물 0.2 및 1 mg/mL의 총페놀 함량은 각각 0.37 및 1.25 mM gallic acid와 동등한 수준이었다. 또한, HepG2 세포주를 이용한 세포배양에서 만병초 추출물 0.1 mg/mL 농도의 첨가는 0.2 및 0.5 mM tert-butyl hydroperoxide로 유도된 세포독성을 각각 52.1 및 30.3% 감소시켰다. 따라서, 본 연구 결과들은 만병초 추출물의 강력한 항산화 효과와 세포독성 억제 효과를 나타내며, 이러한 효능은 적어도 자유라디칼의 산화 억제와 높은 총페놀 함량에 기인하는 것으로 사료된다.
Abstract
The objective of this study was to investigate the antioxidative capacity of Rhododendron brachycarpum 95% ethanol extracts. Total antioxidant status was examined by total antioxidant capacity against ABTS radical reactions. Total antioxidant capacities of R. brachycarpum extract at the concentrations of 0.2 and 1 mg/mL were 0.33 and 2.26 mM Trolox equivalents, respectively. Superoxide scavenging activities of R. brachycarpum extract at the concentrations of 0.2 and 1 mg/mL were 45.0 and 77.0%, respectively. Oxygen radical absorbance capacities of R. brachycarpum extract at the concentrations of 5 and 100 μg/mL were 40.88 and 131.00 μM Trolox equivalents, respectively. Total phenolic contents of R. brachycarpum extract at the concentrations of 0.2 and 1 mg/mL were 0.37 and 1.25 mM gallic acid equivalents, respectively. R. brachycarpum extract at the concentration of 0.1 mg/mL inhibited 0.2 mM and 0.5 mM tert-butyl hydroperoxide induced cyototoxicity by 52.1 and 30.3%, respectively, in HepG2 cell culture system. Thus, strong antioxidant and cytotoxicity-inhibiting effects of R. brachycarpum 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.
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