Studies On Chemical Constituents Of N-butanol Extract From The Roots Of Pteroxygonum Giraldii

Pteroxygonum giraldii Damm. et Diels belongs to Pteroxygonum genus,Polygonum family, which is an indigenous plant of China. The roots of this plant areused as a folk medicine named―Qiao Mai Qi‖in China for treating haematemesis,lower metrorrhagia, tumefaction, burn rheumatic condition and anti-dysentery. Thechemical constituents of Pteroxygonum giraldii have been reported rarely. Therefore,we conducted studies on chemical constituents of the title plant.The chemical constituents of the n-butanol extracts from the roots of P. giraldiiwere isolated and purified by column chromatography over silica gel, polyamide,Sephadex LH-20. The structures were elucidated on the basis of physicochemicalproperties and spectral data analyses. Fourteen compounds were isolated andidentified as3-O-methylmyricetin-3’-O--D-xylopyranoside (PGE-1), daucosterol(PGE-10),5,7,5’-trihydroxy-3,4’-di-O-methoxyflavone-2’-O--D-glucopyranoside(PGE-16),5,7,4’,5’-tetrahydroxy-3-O-methoxyflavone-2’-O--D-glucopyranoside(PGE-17), myricetin-3-O--L-rhamnopyranoside (PGE-18), myricetin-3-O--D-ga-lactopyranoside (PGE-19), quercetin-3-O--D-galactopyranoside (PGB30-3),(E)-2,3,5,4’-tetrahydroxystilbene-2-O--D-glucopyranoside (PGB30-5), fructose (PGB30-6),mono butyl2-(4-hydroxybenzyl)tartrate (PGB30-8), adenine (PGB30-11), n-butylgallate (PGB50-2), quercetin (PGB50-8), butyl(4-β-D-glucopyranosyloxy-phenyl)acetate (PGB50-9). PGB50-9is a new compound. PGB30-3, PGB30-5, PGB30-6,PGB30-8, PGB30-11, PGB50-2, PGB50-8were reported for the first time from thegenus Pteroxygonum.