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用内标物在阳离子交换柱预处理后,经HPLC分析对配伍麻黄方剂中的伪麻黄碱(PEP)及麻黄碱
After pretreatment with an internal standard on a cation exchange column, HPLC analysis of pseudoephedrine (PEP) and ephedrine in a matching ephedra prescription