The aim of this study is to evaluate antioxidant activities of Hydrallgea macrophylla var. thunbergii(Sookuk tea) extracts. Hot water extract of Sookuk tea leave was fractionated serially by n-hexane, chloroform, ethyl acetate, and n-butanol. The anti...
The aim of this study is to evaluate antioxidant activities of Hydrallgea macrophylla var. thunbergii(Sookuk tea) extracts. Hot water extract of Sookuk tea leave was fractionated serially by n-hexane, chloroform, ethyl acetate, and n-butanol. The antioxidant activity of each fraction was tested using a DPPH method. The IC50 value for scavenging 50% DPPH radicals was 2.50±0.04 mg/mL for hot water extract of Sookuk tea leave. Among the fractions, the IC50 value of ethyl acetate fraction was the lowest (0.461±0.004 mg/mL) and the residual aqueous fraction was the highest (6.30±0.30 mg/mL). The total polyphenol and flavonoid content of the ethyl acetate fraction were the highest, which supported the strong antioxidant activity of the fraction.