Extracts were purified and chromatographed on sequential SiO2 partition columns and C18 reversed-phase high-performance liquid chromatography, and GA-like substances were detected and quantified by the cv. ###>Des extraits furent purifiés et chromatographies sur colonnes de SiO2 à séparation séquentielle et par chromatographic liquide à haute performance en phase renversée sur colonne C18.