title: Triterpenoid saponins from the seeds of Pharbitis nil.
abstract: From the seeds of Pharbitis nil (Convolvulaceae), two new oleanene-type triterpene glycosides, pharbitosides A (1) and B (2), together with beta-sitosterol, beta-sitosterol glucoside (daucosterol), caffeic acid, and methyl caffeate were isolated. The structure of pharbitoside A (1) was elucidated to be queretaroic acid 3-O-alpha-L-rhamnopyranosyl-(1-->2)-O-beta-D-glucopyranosyl-(1-->2)-beta-D-glucopyranoside (1). Pharbitoside B (2) is a 21alpha-hydroxyoleanolic acid saponin carrying the same sugar moiety as that of pharbitoside A (1).
authors.affiliation: Department of Drug Research & Development, Korea Institute of Oriental Medicine, Daejeon, Korea.
authors.forename: Da Young
authors.initials: DY
authors.lastname: Jung
authors.forename: Hyekyung
authors.initials: H
authors.lastname: Ha
authors.forename: Ho Young
authors.initials: HY
authors.lastname: Lee
authors.forename: Chungsook
authors.initials: C
authors.lastname: Kim
authors.forename: Je-Hyun
authors.initials: JH
authors.lastname: Lee
authors.forename: Kihwan
authors.initials: K
authors.lastname: Bae
authors.forename: Ju Sun
authors.initials: JS
authors.lastname: Kim
authors.forename: Sam Sik
authors.initials: SS
authors.lastname: Kang
mesh_terms: D002236:Carbohydrate Conformation; D006868:Hydrolysis; D049915:Ipomoea nil / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D012503:Saponins / Q000032:analysis*; D012639:Seeds / Q000737:chemistry*; D016339:Spectrometry, Mass, Fast Atom Bombardment; D013055:Spectrophotometry, Infrared; D014315:Triterpenes / Q000032:analysis*
chemical_list: D012503:Saponins; D014315:Triterpenes; C527220:pharbitoside A; C527222:pharbitoside B