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Abstract The volatile flavor compounds of the essential oils from Ixeris dentate (Thunb.) Nakai and I. stolonifera A. Gray were investigated. The essential oils were extracted by hydro distillation extraction method. Ninety-three volatile flavor components were identified from I. dentate (Thunb.) Nakai essential oil. Hexadecanoic acid(33.73%) was the most abundant compound, followed by (Z,Z,Z,)-9,12,15-octadecatrienoic acid(18.59%), 6,10,14-trimethyl-2-pentadecanonel(10.39%) and phytol(5.21%). Ninety-seven volatile flavor components were identified from the essential oil of I. stolonifera A. Gray. Hexadecanoic acid was the most abundant component(39.7%), followed by (Z,Z,Z)-9,12,15-octadecatrienoic acid(12.63%), 9,12-octadecadienoic acid, ethyl ester(12.36%), pentacosane(5.2%) and 6,10,14-trimethyl- 2-pentadecanone(3.18%). The volatile composition of I. dentate (Thunb.) Nakai was characterized by higher contents of phytol and phthalides than those of I. stolonifera A. Gray. The volatile flavor composition of I. stolonifera A. Gray can easily be distinguished by the percentage of sesquiterpene compounds against I. dentate (Thunb.) Nakai essential oil. Key words: Ixeris dentate (Thunb.) Nakai, Ixeris stolonifera A. Gray, essential oil composition

GC-MS Analyses of the Essential Oils from Ixeris dentate(Thunb.) Nakai and I. stolonifera A. Gray