Tribulin, a New Steroidal Saponin from the Aerial Parts of  Tribulus terrestris

Mamdouh N. Samy; Mokhtar M. Bishr; Ahmed A. Ahmed; Mohamed S. Kamel

Tribulin, a New Steroidal Saponin from the Aerial Parts of Tribulus terrestris

Mamdouh N. Samy ¹, Mokhtar M. Bishr ², Ahmed A. Ahmed ³, Mohamed S. Kamel ⁴

Affiliations
1 Department of Pharmacognosy, Minia University, Minia 61519, Egypt
2 Research and Development Department, Mepaco Company, Cairo, 11361, Egypt
3 Department of Organic Chemistry, Minia University, Minia 61519, Egypt
4 Department of Pharmacognosy, Minia University, Minia 61519, India

From the aerial parts of Tribulus terrestris, a new steroidal saponin, Diosgenin 3-O-[{α -L-rhamnopyranosyl-(1→3)} {α -L-rhamnopyranosyl- (1→4)}]-β-D-glucopyranosyl-(1→4)-β-D-glucopyranoside namely tribulin has been isolated together with six known compounds; scoparon, campesterol, stigmasterol, βsitosterol, Diosgenin 3-O-[{α -Lrhamnopyranosyl-( 1→4)-β-D-glucopyranoside and D-(+)-pinitol. The structure of the new saponin was elucidated on the basis of spectroscopic analyses including 1D-NMR and mass spectroscopy (EI-MS) and chemical reactions.