title: Photosensitivity in South Africa. IX. Structure elucidation of a beta-glucosidase-treated saponin from Tribulus terrestris, and the identification of saponin chemotypes of South African T. terrestris.
abstract: Saponin C, a beta-glucosidase-treated saponin isolated from ethanol-water extracts of a South African collection of Tribulus terrestris, was shown by one- and two-dimensional NMR spectroscopy to be ruscogenin 1-O-alpha-L-rhamnopyranosyl-(1-->2)-beta-D-6)-acetylglucopyranoside++ +. GC-MS analysis of the hydrolysed ethanol-water (4:1) extracts of T.terrestris specimens from two of four sites, revealed high levels of ruscogenin and potentially lithogenic diosgenin saponins. Specimens from two other sites contained non-lithogenic saponins derived predominantly from tigogenin, neotigogenin, gitogenin and neo-gitogenin.
authors.affiliation: Chemistry Department, University of Waikato, Hamilton, New Zealand.
authors.forename: A L
authors.initials: AL
authors.lastname: Wilkins
authors.forename: C O
authors.initials: CO
authors.lastname: Miles
authors.forename: W T
authors.initials: WT
authors.lastname: De Kock
authors.forename: G L
authors.initials: GL
authors.lastname: Erasmus
authors.forename: A T
authors.initials: AT
authors.lastname: Basson
authors.forename: T S
authors.initials: TS
authors.lastname: Kellerman
mesh_terms: D000818:Animals; D009682:Magnetic Resonance Spectroscopy; D015394:Molecular Structure; D010787:Photosensitivity Disorders / Q000209:etiology / Q000662:veterinary*; D010939:Plant Poisoning / Q000662:veterinary; D006109:Poaceae / Q000737:chemistry*; D012503:Saponins / Q000737:chemistry* / Q000145:classification / Q000506:poisoning; D012756:Sheep; D012757:Sheep Diseases / Q000209:etiology; D013019:South Africa
chemical_list: D012503:Saponins