483286.fig.003
Figure 3: Amount of ferulic acid and Z-ligustilide in water extracts of Angelica roots. The water extracts of Angelica roots was analyzed by  RRLC-QQQ-MS/MS. 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, ; .