Determination of hydroxyzine hydrochloride, ephedrine hydrochloride and theophylline in laboratory prepared mixtures by the proposed ratio-subtraction combined with derivative spectrophotometric method.

Determination of hydroxyzine hydrochloride, ephedrine hydrochloride and theophylline in laboratory prepared mixtures by the proposed ratio-subtraction combined with derivative spectrophotometric method.采用所提出的比值-减法结合导数分光光度法(ratio-subtraction combined with derivative spectrophotometric method)，测定实验室制备的混合样品中的盐酸羟嗪(hydroxyzine hydrochloride)、盐酸麻黄碱(ephedrine hydrochloride)与茶碱的含量。