title: Steroidal saponins from the aerial parts of Tribulus alatus Del.
abstract: Six steroidal glycosides (1-6) were isolated from the aerial parts of Tribulus alatus Del. (Zygophyllaceae), together with one known cholestane, one spirostane, and six flavonol glycosides. Among them, 1 and 2 possess a furostane-type aglycone, 3 and 6 a cholestane structure, and 4 and 5 a spirostane skeleton. Their structural elucidation was accomplished by extensive spectroscopic methods including 1D ((1)H, (13)C, (13)C DEPT, TOCSY, ROESY) and 2D NMR experiments (DQF-COSY, HSQC, HMBC) as well as ESI-MS analysis.
authors.affiliation: Dipartimento di Chimica Bioorganica e Biofarmacia, Università di Pisa, Via Bonanno 33, 56126 Pisa, Italy.
authors.forename: Abeer
authors.initials: A
authors.lastname: Temraz
authors.forename: Omayma D
authors.initials: OD
authors.lastname: El Gindi
authors.forename: Hazem A
authors.initials: HA
authors.lastname: Kadry
authors.forename: Nunziatina
authors.initials: N
authors.lastname: De Tommasi
authors.forename: Alessandra
authors.initials: A
authors.lastname: Braca
mesh_terms: D019906:Nuclear Magnetic Resonance, Biomolecular; D035261:Plant Components, Aerial / Q000737:chemistry; D012503:Saponins / Q000737:chemistry* / Q000302:isolation & purification; D021241:Spectrometry, Mass, Electrospray Ionization; D013256:Steroids / Q000737:chemistry* / Q000302:isolation & purification; D032444:Tribulus / Q000737:chemistry*
chemical_list: D012503:Saponins; D013256:Steroids