Triterpenoid saponins from Piptadeniastrum africanum (Hook. f.) Brenan

Abstract One new triterpenoid saponin, named piptadeniaoside ( 1 ), along with two known saponins ( 2 – 3 ) have been isolated from the stem bark of Piptadeniastrum africanum . After previous isolation of flavone derivatives from this plant, new phytochemical investigations were performed for its saponin content. Their structures were established by direct interpretation of their spectral data, mainly HRESIMS, 1D NMR ( 1 H, 13 C NMR, DEPT) and 2D NMR (COSY, NOESY, HSQC and HMBC), and by comparison with the literature data.