Chemical Composition Comparison of the Essential Oil from Four Groups ofOsmanthus fragransLour. Flowers

To compare the chemical composition of four groups of Osmanthus fragrans Lour., their flowers were collected at the same place and same season. The essential oils were extracted from the fresh flowers by simultaneous distillation extraction (SDE), and the chemical compositions of the essential oils were evaluated by using gas chromatography mass spectrometry (GC-MS) and identified in comparison with authentic compounds coupled with linear retention index (LRI). Totally 51 components were identified. γ-decalactone was the common composition, which content was the highest in Thunbergii, Aurantiacus and Sempeiflorens groups, accounting for 17.71 %, 30.10 %and 19.94 %, respectively. The content of 1,3,5-Trioxepane was the highest in Latifolius group, accounting for 22.69 %. Ketones, alcohols, asters, aldehydes and acids were the major constituents of four different O. fragrans, representing 90.05 %, 95.07 %, 86.76 %and 80.21 % of the essential oil, respectively.