摘要
This paper describes an effective method for determining ciprofloxacin lactate. An excess of sodium tetraphenylboron was added to precipitate ciprofloxacin lactate in HAc-NaAc buffer solution (pH=4.0). After filtering off the precipitate, the excessive sodium tetraphenylboron in the filtrate was titrated with cetyltrimethylammonium bromide standard solution, with bromophenol blue as indicator. The method is simple and rapid, it has been applied to the determination of ciprofloxacin lactate raw material with satisfactory results. The recovery was between 99.66% and 100.2%, the relative error was less than ±0.40%. Experiments showed that the method gave the same results as the approach using nonaqueous titration (ChP).
本文介绍一种测定乳酸环丙沙星含量的有效方法。在pH =4 0的HAc NaAc缓冲溶液中 ,乳酸环丙沙星可与四苯硼钠定量地形成分子比为 1:1的沉淀 ,待沉淀反应完全后 ,过滤 ,弃去初滤液。以溴酚蓝为指示剂 ,用十六烷基三甲基溴化铵标准溶液滴定续滤液中过量的四苯硼钠 ,方法简便 快速 ,应用于多批乳酸环丙沙星原料药样品的测定 ,其回收率为99 6 6 % - 10 0 2 % ,相对误差 <± 0 40 % 。
