[Study on the dynamic variations of Z-ligustilide and n-butylidenephthalide content in essential oil of radix angelicae sinensis from different growth period].

To study the variation of the biomass of the root and active components of Angelica sinensis during different growth periods.27 batches of Angelica sinensis were harvested from different growth periods, and the biomass of underground parts were determined; The Gas Chromatography-Mass Spectrometry (GC-MS) was used for determining the contents of Z-ligustilide and n-Butylidenephthalide in essential oil of Radix Angelicae Sinensis.The average contents of n-Butylidenephthalide and Z-ligustilide were more than 1% and 40% in the total essential oil of Radix Angelicae sinensis respectively. Their contents showed larger difference during different growth period.The contents of Z-ligustilide and n-Butylidenephthalide of Radix Angelicae Sinensis is closely related to their growth period.