483286.fig.002
Figure 2: Comparison of five chemical markers in the extracts of Angelica roots. The ethyl acetate extracts of Angelica roots was analyzed by GC-QQQ-MS/MS. The detailed protocol was described in Material and Methods. Values are expressed in milligrams per gram of dry material and in mean ± SD, where . Statistical comparison was made with Angelica roots from Gansu, China, ; .