title: Isolation and characterization of saponins from Castanospermum australe Cunn. et Fraser.
abstract: Three new triterpenoid saponins, their methyl esters designated as castaralesides F (1), G (2) and H (3), were isolated from the fresh leaves of Castanospermum australe. The structures of these three saponins were elucidated on the basis of chemical and spectral data as 3 beta-O-[beta-galactopyranosyl-(1-->4)-beta-glucuronopyranosyl]-2 beta,23-dihydroxyolean-12-en-28-oic acid; 3 beta-O-[alpha-rhamnopyranosyl-(1-->4)-beta-galactopyranosyl-(1-->2)-beta - glucurono-pyranosyl]-2 beta,28-dihydroxyolean-12-ene; and 3 beta-O-[alpha-rhamnopyranosyl-(1-->4)-beta-xylopyranosyl-(1-->2)-beta- glucuronopyranosyl]-2 beta,28-dihydroxyolean-12-ene.
authors.affiliation: Department of Pharmacognosy, University of Karachi, Pakistan.
authors.forename: W
authors.initials: W
authors.lastname: Ahmed
authors.forename: K
authors.initials: K
authors.lastname: Usmanghani
authors.forename: I
authors.initials: I
authors.lastname: Ahmad
authors.forename: V U
authors.initials: VU
authors.lastname: Ahmad
authors.forename: T
authors.initials: T
authors.lastname: Miyase
mesh_terms: D002240:Carbohydrate Sequence; D009682:Magnetic Resonance Spectroscopy; D008969:Molecular Sequence Data; D010944:Plants / Q000737:chemistry*; D012503:Saponins / Q000737:chemistry / Q000302:isolation & purification*; D014315:Triterpenes / Q000737:chemistry / Q000302:isolation & purification*
chemical_list: D012503:Saponins; D014315:Triterpenes