title: Steroidal saponins from the aerial parts of Tribulus pentandrus Forssk.
abstract: Seven new steroidal glycosides named pentandrosides A(1)-G(7) were isolated from the EtOH extract of the aerial parts of Tribulus pentandrus. Pentandrosides A(1)-E(5) possess cholestane aglycones, pentandroside F(6) a furostan-type aglycone and pentandroside G(7) an unusual acyloxypregnane aglycone probably derived from the degradation of a furostan skeleton. Structure elucidation of 1-7 was accomplished through the extensive use of 1D- and 2D NMR experiments including 1H-1H (DQF-COSY, 1D-TOCSY) and 1H-13C (HSQC, HMBC) spectroscopy along with ESIMS and HRESIMS.
authors.affiliation: Department of Botany, Faculty of Science, South Valley University, Aswan 81528, Egypt.
authors.forename: Arafa I
authors.initials: AI
authors.lastname: Hamed
authors.forename: Wieslaw
authors.initials: W
authors.lastname: Oleszek
authors.forename: Anna
authors.initials: A
authors.lastname: Stochmal
authors.forename: Cosimo
authors.initials: C
authors.lastname: Pizza
authors.forename: Sonia
authors.initials: S
authors.lastname: Piacente
mesh_terms: D002849:Chromatography, Gas; D009682:Magnetic Resonance Spectroscopy; D015394:Molecular Structure; D035261:Plant Components, Aerial / Q000737:chemistry*; D012503:Saponins / Q000302:isolation & purification*; D032444:Tribulus / Q000737:chemistry*
chemical_list: D012503:Saponins