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

Objective: To study the variation of the biomass of the root and active components of Angelica sinensis during different growth periods.

Methods: 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.

Results: 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.