Chemical Composition Analysis of Essential Oil from Ligusticum chuanxiong Hort. Leaves in Yunnan

Essential oil was extracted by steam distillation from Ligusticum chuanxiong Hort leaves and analyzed by gas chromatography-mass spectroscopy(GC-MS).Totally 84 and 51 compounds were identified in essential oils from Ligusticum chuanxiong Hort leaves harvested in spring and summer,with a relative content of respectively 97.8% and 98.2%.No significant difference in chemical composition was observed between essential oils from the leaves harvested at both seasons.The major components were 3,4-dimethylenecyclopent-anone,5,7,8-trimethyl-2-chromanone,caryophyllene,trans-ocimene,cis-ocimene,(+)-sabinene and α-pinene.