Chemical constituents in aerial parts of Polygonum capitatum

Objective To study the chemical constituents in the aerial parts of Polygonum capitatum.Methods The chemical constituents were isolated and purified by various column chromatographic methods.Their chemical structures were identified by physicochemical properties and spectral analyses.Results Twenty-five compounds were isolated from the 70% ethanolic extract and identified as {1-[(12E,16E)-12,16-eicosadienoyl]-2-[(E,E)-7,11-octadecadienoyl]-3-stearoylglycerol}(1),24-methylenecycloartenol(2),phytol(3),β-sitosterol(4),kaempferol(5),ethyl protocatechuate(6),p-hydroxybenzoic acid(7),ethyl gallate(8),5,7-dihydroxychromone(9),3-O-methylquercetin(10),gallic acid(11),N-trans-caffeoyltyramine(12),β-daucosterol(13),quercitrin(14),kaempferol-3-O-α-L-rhamnopyranoside(15),kaempferol-3-O-β-D-glucopyranoside(16),2″-O-galloylquercitrin(17),quercetin(18),2″-O-galloylhirsutrin(19),myricitrin(20),ethyl brevifolin carboxylate(21),brevifolin(22),quercetin-3-O-[(6″-O-transferuloyl)-β-D-galactopyranoside](23),flazine(24),and ellagic acid(25),respectively.Conclusion Compounds 1—3,7,12,21—25 are isolated from this plant for the first time.