title: Glucuronide triterpene saponins from Bersama engleriana.
abstract: Five 3-O-glucuronide triterpene saponins (1-5) were isolated from the stem bark of Bersama engleriana Gurke along with two known saponins, polyscias saponin C and aralia saponin 15, and one major C-glycoside xanthone, mangiferin. The structures of the saponins were established mainly by means of spectroscopic methods (one- and two-dimensional NMR spectroscopy as well as FAB-, HRESI-mass spectrometry) as 3-O-[beta-D-glucopyranosyl-(1-->2)-beta-D-glucuronopyranosyl]-28-O-[beta-D-glucopyranosyl]-betulinic acid (1), 3-O-[beta-D-glucopyranosyl-(1-->2)-[beta-D-galactopyranosyl-(1-->3)]-beta-D-glucuronopyranosyl]-oleanolic acid (2), 3-O-[beta-D-glucopyranosyl-(1-->3)-beta-D-glucuronopyranosyl]-28-O-[beta-D-xylopyranosyl-(1-->6)-beta-d-glucopyranosyl]-oleanolic acid (3), 3-O-[beta-D-galactopyranosyl-(1-->3)-beta-D-glucuronopyranosyl]-28-O-[beta-D-glucopyranosyl-(1-->4)-beta-D-glucopyranosyl]-oleanolic acid (4), and 3-O-[beta-d-glucopyranosyl-(1-->3)-beta-D-galactopyranosyl-(1-->3)-beta-D-glucuronopyranosyl]-28-O-[beta-d-xylopyranosyl-(1-->6)-beta-D-glucopyranosyl]-oleanolic acid (5).
authors.affiliation: Laboratoire de Pharmacognosie, Unité de Molécules d'Intérêt Biologique, UMIB UPRES EA3660, Faculté de Pharmacie, Université de Bourgogne, 7, Bd Jeanne d'Arc, BP 87900, F-21079, Dijon Cedex, France.
authors.forename: Azefack Léon
authors.initials: AL
authors.lastname: Tapondjou
authors.forename: Tomofumi
authors.initials: T
authors.lastname: Miyamoto
authors.forename: Marie-Aleth
authors.initials: MA
authors.lastname: Lacaille-Dubois
mesh_terms: D002236:Carbohydrate Conformation; D002240:Carbohydrate Sequence; D006027:Glycosides / Q000737:chemistry; D009682:Magnetic Resonance Spectroscopy / Q000379:methods; D008969:Molecular Sequence Data; D024301:Plant Bark / Q000737:chemistry; D010936:Plant Extracts / Q000737:chemistry; D010946:Plants, Medicinal / Q000737:chemistry*; D012503:Saponins / Q000737:chemistry* / Q000302:isolation & purification; D014315:Triterpenes / Q000737:chemistry* / Q000302:isolation & purification
chemical_list: D006027:Glycosides; D010936:Plant Extracts; D012503:Saponins; D014315:Triterpenes