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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 n = 3. Statistical comparison was made with Angelica roots from Gansu, China, *P < 0.05; **P < 0.01.
