A new aurone glycoside from the whole plant of Bidens pilosa L.
Ten compounds were isolated from the 95％ethanol extract of the whole plant of Bidens pilosa L.by silica gel column chromatography,polyamide column chromatography,Sephadex LH-20 column chromatography,MCI column chromatography,and semi-preparative HPLC methods.Based on its physicochemical properties and spectral data(UV,IR,MS,NMR),the structures of the isolates were identified as bidpilaurone glycoside A(1),Z-6-O-(4"-O-acetyl-6"-O-p-coumariny 1-β-D-glucopyranosyl)-6,7,3',4'-tetrahydroxyaurone(2),okanin 4'-O-β-D-(4",6"-diacetyl)glucopyranoside(3),Z-6-O-(6"-O-acetyl-β-D-glucopyranosyl)-6,7,3',4'-tetrahydroxyaurone(4),6,7,3,4'-tetrahydroxyaurone(5),Z-6-O-(6-O-coumarinyl-β-D-glucopyranosyl)-6,7,3',4'-tetrahydroxyaurone(6),Z-6-O-(4,6-acety1-β-D-pyranosyl)-6,7,3,4'-tetrahydroxyaurone(7),Z-6-O-(6"-O-p-coumarinyl-β-D-glucopyranosyl)-6,7,3',4'-tetrahydroxyaurone(8),luteolin(9),and 7-O-β-D-glucopyranosyl-5,3'-dihydroxy-3,6,4'-trimethoxyflavone(10).Among them,compound 1 was a new aurone glycoside from B.pilosa L.Compounds 4 and 9 could partially inhibit the lipid deposition induced by sodium oleate and palmitate in human liver HepG2 cells.Molecular docking technology predicts that the potential target for its hypolipidemic activity may be peroxisome proliferator-activated receptors γ(PPARγ).
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