羧苄青霉素二钠制剂中混杂有青霉素 G 钠,限量应不得超过5%。英国药典(1968补遗版)用电泳分离-生物法进行检测。本文提出的薄层分离-分光光度测定法,比较快速简便。操作:取20×20厘米铺在铝片上的硅胶(厚0.25毫米)薄层板2块,分别用铅笔划分为7个25毫米宽的长条,每边留出12.5毫米宽。在三个长条 Carbenicillin disodium mixture mixed with penicillin G sodium, the limit should not exceed 5%. British Pharmacopoeia (1968 Replenishment Edition) electrophoretic separation - biological tests. The proposed thin-layer separation - spectrophotometry, more quickly and easily. Operation: Take two pieces of silica gel (0.25 mm in thickness) on 20 x 20 cm aluminum sheets and divide them into seven 25 mm wide strips with a pencil, leaving 12.5 mm wide on each side. In three strips