title: Novel Saponins from Zizyphus spina-christi growing in Egypt.
abstract: From the butanol extract of the leaves of Zizyphus spina-christi (L.) Willd. (Rhamnaceae), four saponin glycosides were isolated: Christinin A (1), B (2), C (3), and D (4). Their structures were determined by chemical and spectroscopic evidence. Compound 1, was found to be 3-O-[alpha-L-fucopyranosyl (1 -> 2)-beta-D-glucopyranosyl(1 ->3)-alpha-L-arabinopyranosyl]jujubogenin; the others are the new, 2 being 3-O-[alpha-D-fucopyranosyl(1 -> 2)-¿beta-D- glucopyranosyl-4-sulphate(1 ->3)¿-alpha-L-arabinopyranosyl]jujubogenin, 3 being 3-O-beta-glucopyranosyl(1 -> 2)-alpha-L-rhamnopyranosyl (1 -> 3)-alpha- L-arabinopyranosyl]jujubogenin, and 4 being 3-O-[alpha-L-fucopyranosyl(1 -> 2) -¿beta-D-arabinopyranosyl(1 -> 3)-beta-D-glucopyranosyl(1 -> 3)¿-alpha-L- arabinopyranosy]jujubogenin.
authors.affiliation: Pharmacognosy Department, Faculty of Pharmacy, Cairo University, Egypt.
authors.forename: G
authors.initials: G
authors.lastname: el-Din Hussein Mahran
authors.forename: K W
authors.initials: KW
authors.lastname: Glombitza
authors.forename: Y W
authors.initials: YW
authors.lastname: Mirhom
authors.forename: R
authors.initials: R
authors.lastname: Hartmann
authors.forename: C G
authors.initials: CG
authors.lastname: Michel
mesh_terms: D002236:Carbohydrate Conformation; D002240:Carbohydrate Sequence; D004534:Egypt; D008969:Molecular Sequence Data; D015394:Molecular Structure; D010936:Plant Extracts / Q000302:isolation & purification*; D018515:Plant Leaves; D012503:Saponins / Q000737:chemistry* / Q000302:isolation & purification*; D016339:Spectrometry, Mass, Fast Atom Bombardment
chemical_list: D010936:Plant Extracts; D012503:Saponins