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  • Title: Triterpenoid saponins from the seeds of Pharbitis nil.
    Author: Jung DY, Ha H, Lee HY, Kim C, Lee JH, Bae K, Kim JS, Kang SS.
    Journal: Chem Pharm Bull (Tokyo); 2008 Feb; 56(2):203-6. PubMed ID: 18239310.
    Abstract:
    From the seeds of Pharbitis nil (Convolvulaceae), two new oleanene-type triterpene glycosides, pharbitosides A (1) and B (2), together with beta-sitosterol, beta-sitosterol glucoside (daucosterol), caffeic acid, and methyl caffeate were isolated. The structure of pharbitoside A (1) was elucidated to be queretaroic acid 3-O-alpha-L-rhamnopyranosyl-(1-->2)-O-beta-D-glucopyranosyl-(1-->2)-beta-D-glucopyranoside (1). Pharbitoside B (2) is a 21alpha-hydroxyoleanolic acid saponin carrying the same sugar moiety as that of pharbitoside A (1).
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