Study on the determination of metronidazole and amoxicillin in Bijiaxilin tablet by HPLC / 中国药学杂志

ABSTRACT

OBJECTIVE　In order to control the quality of Bijiaxilin tablet, a method for the determination of metronidazole and amoxicillin was developed.METHOD　A HPLC procedure was established.A 6.0 mm×150 mm Shim-Pack CLC-ODS column with a mobile phase consisting of pH6.5,0.02 mol*L-1 phosphate buffer-acetonitrile(90∶10) was used.A 10 μL portion of the sample solution was chromatographed and detected at 272 nm.The effects of the types of the mobile phase on the retention behaviour of metronidazole,amoxicillin and the other components in the samples were investigated.The effect of the solvent used for sample preparation on the stability of metronidazole and amoxicillin was also studied.RESULTS　Metronidazole,amoxicillin and the other components in the samples were separated completely.The recoveries were 99.88% for metronidazole and 99.96% for amoxicillin with RSD less than 1.7%.CONCLUSION　The proposed method is selective,simple,accurate and precise.