百喘朋片(咳喘片)为止咳平喘药,国内许多地方药品标准均有收载。其含量测定有银量法、非水滴定法及比色法等。但各有其缺点,如测定总氯量不能反映两种成分的真实含量,准确度不高;非水滴定法和比色法操作繁杂、实验误差较大等。目前有人采用导数分光光度法、薄层扫描法测定百喘朋片中盐酸苯海拉明和盐酸麻黄素的含量。 Baichuanpeng tablets (cough tablets) cough and asthma drugs, many local drug standards are included. The determination of the amount of silver method, non-water titration and colorimetry. But each has its own drawbacks, such as determination of total chlorine can not reflect the true content of the two components, the accuracy is not high; non-aqueous titration and colorimetric complicated, experimental error is large. At present, some people use derivative spectrophotometry, thin layer scanning method for determination of diphenhydramine tablets diphenhydramine hydrochloride and ephedrine hydrochloride content.