Antiinflammatory Activity of α-Hederin Methyl Ester from the Alkaline Hydrolysate of the Butanol Fraction of Kalopanax pictus Bark Extract

Three antiinflammatory saponin components were isolated from the alkaline hydrolysate of a butanol-soluble portion of Kalopanax pictus bark extract through an in vivo activity-guided fractionation procedure. The hydrolysate showed inhibition of adjuvant induced arthritis in rats. After further fractionation, the ethyl acetate fraction exhibited antiarthritic activity, which resulted in the isolation of α-hederin, α-hederin methyl ester, and kalopanaxsaponin I. All compounds showed inhibition of vascular permeability in mice, but only α-hederin methyl ester showed anticarrageenan activity in rats and antiarthritic activity in rats and mice.