Abstract
This study was carried out to elucidate the antiinflammatory effect of 70% methanol extract obtained from the dried fruit of Forsythia suspensa Vahl and its active principles. F. suspensa was extracted with 70% methanol and freeze-dried to give a powdered extract. The methanol extract was then dissolved in water and extracted with n-hexane, and the n-hexane fraction was evaporated to dryness under vacuum; the water fraction was freeze-dried to give a powdered extract. The antiinflammatory activity of the extract and fractions was investigated on acetic acid-induced vascular permeability and writhing symptoms in mice, as well as on carrageenin-induced edema and cotton pellet-induced granuloma formation in rats. The methanol extract and the n-hexane fraction (p.o.) showed the antiinflammatory effect and analgesic effect, but the water fraction did not. These results suggested that the antiinflammatory and analgesic activity induced by the methanol extract shifted to the n-hexane fraction and the active principles may be lipophilic compounds.
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