Triterpenoid saponins from the seeds of Pharbitis nil.
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).
Jung
Da Young
DY
Department of Drug Research & Development, Korea Institute of Oriental Medicine, Daejeon, Korea.
Ha
Hyekyung
H
Lee
Ho Young
HY
Kim
Chungsook
C
Lee
Je-Hyun
JH
Bae
Kihwan
K
Kim
Ju Sun
JS
Kang
Sam Sik
SS
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*
D012503:Saponins; D014315:Triterpenes; C527220:pharbitoside A; C527222:pharbitoside B