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Antioxidant activity of Artemisia capillaris Thunberg
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    초록·키워드

    In our continuous study on the biological activities of natural resources, the solvent extracts of Artemisia capillaris Thunb. were evaluated for their potential to scavenge the 1,1-diphenylpicrylhydrazyl (DPPH) free radical and authentic peroxynitrite (ONOO-) and inhibit the generation of ONOOfrom 3-morpholinosydnomimine (SIN-1). The methanol (MeOH) extract of A. capillaris Thunb. showed the strongest antioxidant activity while the dichloromethane (CH₂Cl₂) extract showed the marginal activity in the DPPH system and then the combined extract of the MeOH and CH₂Cl₂ extracts was fractionated with several organic solvents such as, n-hexane, 85% aqueous MeOH, and n-butanol (n-BuOH). The n-BuOH soluble fraction exhibiting the most potent antioxidant activity in DPPH and authentic ONOO model systems was further purified by repeated silica gel column chromatography and RP-HPLC to give 3,4-dicaffeoylquinic acid. The structure of isolated compound 1was elucidated by extensive 2D NMR experiments such as 1H COSY, NOESY, HSQC and HMBC as well as by comparison with the published spectral data.

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