Assay of Nitrofurantoin Oral Suspensions Contaminated with 3-(5-Nitrofurfurylideneamino)hydantoic Acid
作者:E.C. Juenge、M.A. Kreienbaum、D.F. Gurka
DOI:10.1002/jps.2600740128
日期:1985.1
for nitrofurantoin (1) and 3-(5-nitrofurfurylideneamino)hydantoic acid (2), an impurity derived from 1, is presented. The concentration of the impurity ranged from 20 to 300 micrograms/mL in several lots of commercial oral suspensions. Conversion of 1 to 2 with citrate buffer, an excipient in the oral suspension, was achieved; selective hydantoin ring cleavage was accomplished in preference to the generally
提出了呋喃妥因(1)和3-(5-硝基糠基亚氨基)乙内酰脲酸(2)(一种衍生自1的杂质)口服混悬液的反相高效液相色谱(HPLC)分析。在几批市售口服混悬液中,杂质的浓度范围为20至300微克/ mL。用柠檬酸盐缓冲液(口服混悬液中的一种赋形剂)从1转化为2;选择性乙内酰脲环的裂解优先于通常在偶氮甲碱键上观察到的裂解。合成乙内酰脲2并通过NMR,IR,TLC和元素分析进行鉴定。