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采用反相HPLC法测定白花前胡根中醚提取物的有效成分[3'(S)-当归酰氧基,4'(S)-乙酰氧基-3',4'-双氢邪蒿内酯,Pd-Ia]的含量.峰面积与Pd-Ia含量在0.001505～0.1505mg@ml-1范围内呈线性关系.回归方程为C(mg@ml-1)=5.8×10-8A-5.025×10-4.前胡样品中Pd-Ia的含量为0.077%.