effect-directed analysis for the antioxidant compound in salvia verticillata

salvia genus is one of the largest genera of the lamiaceae family. its species have been used for a wide variety of disorders in the local traditional medicine systems. therefore, the genus has been the subject of several phytochemical and biological studies. the aim of the study was to identify the major antioxidant compound(s) from the methanol extract of salvia verticillata using activity-guided fractionation. the crude extract showed strong antioxidant activities in dpph and β-carotene/linoleic acid tests. the ethyl acetate fraction also exhibited a potent free radical scavenging activity compared to the other fractions. further fractionation and purification of the ethyl acetate fraction using chromatography methods yielded a compound with high antioxidant capacity. the isolated active compound was determined as chrysoeriol. it showed a dose-dependent free radical scavenging activity with an ic50 (dpph scavenging) value of 93.32 (80.23 – 108.57) mm.