Publications scientifiques
Jean de dieu Dongmo
Philippe Belle Ebanda Kedi
Anatole Guy Blaise Azébazé* (Auteur correspondant)
Juliette Cathérine Vardamides* (Auteur correspondant)
Michel Feussi Tala
Hartmut Laatsch
Zeitschrift für Naturforschung B
Abstract Phytochemical investigation of the stem bark of Diospyros longiflora yielded longiflorol ( 1 ), a new bergenin α - d -apioside, together with bergenin ( 2 ) and five known compounds: lupeol ( S1 ), betulin ( S2 ), betulinic acid ( S3 ), stigmasterol ( S4 ) and stigmasterol glucoside ( S5 ). Their structures were determined by one-dimensional (1D) and 2D nuclear magnetic resonance experiments along with electrospray ionization high-resolution mass spectrometry and extended density-functional theory calculations of chiroptical properties. Longiflorol ( 1 ) and bergenin ( 2 ) were evaluated for their DPPH (2,2-diphenyl-1-picrylhydrazyl) antioxidant activity, with the crude extract for comparison and ascorbic acid as standard. The results showed that the extract and 2 had good antioxidant activity, whereas 1 showed only moderate activity at high concentration (>2 mg mL −1 ).
