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本文采用高效液相色谱法测定盐酸麻黄碱的含量，以苯巴比妥为内标，以磷酸二氢钾（００５ｍｏｌ／Ｌ）－甲醇（５３∶４７）为流动相，检测波长在２５７ｎｍ，在６０９４μｇ～３６５６６μｇ范围内有良好的线性关系，ｒ＝０９９９９，回收率为１００３３％（ｎ＝８），ＲＳＤ为１０％。
In this paper, the content of ephedrine hydrochloride was determined by HPLC. Phenobarbital was used as internal standard. The mobile phase was potassium dihydrogen phosphate (005 mol / L) -methanol (53:47) , With a good linear relationship in the range of 6094μg ~ 36566μg with r = 09999, recovery of 10033% (n = 8) and RSD of 10%.