Volatile Components of the Essential Oils from the Leaves of Rhododendron dauricum L.by GC-MS

The volatile components of the essential oils from the leaves of Rhododendron dauricum L.were extracted by steam distillation and then analyzed by GC-MS.Total of Fifty four volatile components were identified,composed of 97.84% of total essential oil.The major volatile components are: eduesmol,relative content 10.95%;β-guaiene,relative content 10.21%;longifolenaldehyde,relative content 7.88%;1,5,9,9-tetramethyl-1,4,7-cycloundecatriene,relative content 7.80%;germacrone,relative content 5.91%;(-)-Humulene epoxide Ⅱ,relative content 5.52%;2-heptyl-1,3-dioxolane,relative content 4.99%;caryophyllene,relative content 3.70%;(+)-γ-gurjunene,the relative content 3.44%.