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  • Title: Six triterpenoid saponins from Mmaesa laxiflora.
    Author: Jiang Z, Gallard JF, Adeline MT, Dumontet V, Tri MV, Sévenet T, Païs M.
    Journal: J Nat Prod; 1999 Jun; 62(6):873-6. PubMed ID: 10395506.
    Abstract:
    Six new triterpenoid saponins, maelaxins A-F (1-6), were isolated from a n-BuOH extract of the leaves of Maesa laxiflora. They possess 22-O-angeloyl-camelliagenin A, 16-O-acetyl, 22-O-angeloyl-camelliagenin A, or 22-O-(2Z)-hexenoyl-camelliagenin A as the aglycon. The pentasaccharide moiety linked to C-3 of the aglycon consists of D-glucuronic acid, L-rhamnose, D-glucose, and/or D-galactose. Their structures were elucidated by extensive NMR experiments including 1H-1H (COSY, 2D HOHAHA, NOESY) and 1H-13C (HMQC and HMBC) spectroscopy and chemical evidence.
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