ABSTRACT
This article was aimed to study the chemical constituents of seeds of Descurainia Sophia (L.) Webb. ex Prantl., in order to lay the material foundation for further interpretation of seeds of D. Sophia and provide pharmacodynamic basis as well as the basis for attributing its nature and taste. The compounds were isolated and purified by Diaion HP-20, Toyopearl HW-40, MCI Gel CHP-20, ODS, Silica gel chromatography combining with Pre-HPLC. The structures were identified on the basis of spectral data and physicochemical properties. Twenty eight compounds were isolated and identified from 20% and 80% ethanol fraction. Thirteen compounds were identified from 20% ethanol fraction: kaempferol-3-O-β-D-glucopyranosyl-7-O-β-D-gentiobioside(1), quercetin-3-O-β-D-glucopyranosyl-7-O-β-D-gentiobioside (2), isorhamnetin-3-O-β-D-glucopyranosyl-7-O-β-D-gentiobioside (3), isorhamnetin-3,7-di-O-β-D-glucopyranoside (4), quercetin-3,7-di-O-β-D-glucopyranoside (5), kaempferol-3, 7-di-O-β-D-glucopyranoside (6), kaempferol-3-O-β-D-xylopyranosyl (1 → 2)-β-D-glucopyranoside (7), methyl sinapate (8), syringaldehyde (9), (S)-p- hydroxyphenyl lactate acid (10), (S)-2-hydroxy-phenylpropionic acid (11), scopoletin (12), sinapic acid (13). Fifteen compounds were identified from 80% ethanol fraction: isorhamnetin-3-O-β-D-glucopyranoside (14), quercetin-3-O-β-D-glucopyranoside (15), kaempferol-3-O-β-D-glucopyranoside (16), quercetin (17), kaempferol (18), isorhamnetin (19), syringic acids (20), quercetin-3-O-β-D-arabinopyranoside (21), quercetin-3-O-β-D-xylopyranoside (22), 6-O-[E]-Sinapoyl-(α- and β)-D-glucopyranoside (23), dimethyl (E, E)-4,4'-dihydroxy-3,3',5,5'-tetramethoxylign-7,7'-dien-9,9'-dioate (24), dimethylthomasidioate (25), 2-hydroxy-3-(1H-indol-3-yl) propanoic acid (26), 2-hydroxyl-3-(1H-indol-3-yl) propanoic acid methyl ester (27), 4'-O-methyl-dihydroquercetin (28). It was concluded that compounds 7-11 and 21-28 were isolated from seeds of D. sophia (L.) Webb. ex Prantl. for the first time.