19 Ligusticum chuanxiong Hort. samples of different specifications were collected from different habitats and the quality assessment was developed.
The conditions for the extraction of tetramethylpyrazine present in the extract were studied. The Water refluence is more optimal than Ultrasonic extraction. The reflluence extraction method was further studied by orthogonal design. Four factors were selected in this experiment, including the water and alcohol of different concentration, the solvent c...