ANTIOXIDANT XANTHONES FROM GARCINIA-SUBELLIPTICA

From the woods of Garcinia subelliptica four new xanthones, garciniaxa nthone C, 1,2,5-trihydroxyxanthone, 2,6-dihydroxy-1,5-dimethoxyxanthon e and 1,2-dihydroxy-5,6-dimethoxyxanthone have been isolated along wit h a new benzophenone derivative, 4',6-dihydroxy-2,3'4-trimethoxybenzop hen Their structures have been determined on the basis of mainly spect roscopic data and some chemical reactions. Antioxidative properties of all the isolated xanthones have been evaluated in vitro using three a ssay systems to measure antilipidperoxidation, free radical and supero xide anion scavenging activity.