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百喘朋片是治疗气喘病的良药,它是由盐酸麻黄碱[C_6H_5CH（OH）CH（NHCH_3）CH_3·HC1」、盐酸苯海拉明[（C_6H_5）_2CHO（CH_2）_2N（CH_3）_2·HC1]加上淀粉、硬脂酸镁等组成的制剂。由于盐酸麻黄碱和盐酸苯海拉明的结构相似,故不能用银量法或普通的紫外分光光度法直接测定本片中前者的含量。文献报道可用导数双波长法和二阶导数光谱法测
Baichuan Pian is a good medicine for the treatment of asthma. It is composed of ephedrine hydrochloride [C_6H_5CH (OH) CH (NHCH_3) CH_3 · HCl], diphenhydramine hydrochloride [(C_6H_5) _2CHO (CH_2) _2N (CH_3) _2 HC1] plus starch, magnesium stearate and other preparations. Due to the similar structure of ephedrine hydrochloride and diphenhydramine hydrochloride, it is not possible to directly determine the content of the former in the film by the silver method or ordinary ultraviolet spectrophotometry. Literature reports available dual-wavelength derivative method and second-derivative spectroscopy