Composition of the essential oils of five subspecies ofScutellaria orientalisfrom Turkey

The chemical compositions of the essential oils obtained by hydrodistillation from aerial parts of five subspecies ofScutellaria orientalisL. (subsp.carica, subsp.haussknechtii, subsp.macrostegia, subsp.orientalisand subsp.santolinoides) were analyzed by gas chromatography (GC-FID) and gas chromatography-mass spectrometry (GC-MS), simultaneously. According to essential oil analysis in five subspecies ofS. orientalis, germacrene D (57.2%), bicyclogermacrene (7.4%) and beta-caryophyllene (5.2%) in subsp.carica; germacrene D (23.5%), beta-caryophyllene (14.2%), bicyclogermacrene (9.0%) and caryophyllene oxide (8.1%) in subsp.haussknechtii; germacrene D (47.8%), beta-caryophyllene (16.3%) and bicyclogermacrene (12.0%) in subsp.macrostegia; caryophyllene oxide (23.5%), germacrene D (20.1%) and beta-caryophyllene (14.5%) in subsp.orientalis; germacrene D (42.1%), beta-caryophyllene (13.7%) and bicyclogermacrene (11.3%) in subsp.santolinoideswere determined as major components. To the best of our knowledge, this is the ?rst report on the chemical composition of the essential oil of four subspecies ofS. orientalis.