Steroidal saponins from the aerial parts of Tribulus pentandrus Forssk |
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Authors: | Hamed Arafa I Oleszek Wieslaw Stochmal Anna Pizza Cosimo Piacente Sonia |
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Affiliation: | Department of Botany, Faculty of Science, South Valley University, Aswan 81528, Egypt. |
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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. |
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Keywords: | Tribulus pentandrus Zygophyllaceae Cholestane glycosides Furostan glycoside Pregnane glycoside Pentandrosides A-G |
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