An unknown impurity (degradation product) present at a level below 0.1% in the initial sample was increased to 0.25% in 50 °C 3M stability samples of lamivudine, zidovudine and nevirapine tablets for oral suspension, as detected by gradient reverse phase HPLC. This degradation product was isolated using reverse phase preparative HPLC. Based on the spectral data, the structure of this degradation product is characterized as 1-[5-hydroxymethyl-4-(5-methyl-2,3-dihydro-[1,2,3]triazole-1-yl)-tetrahydrofuran-2-yl]-5-methyl-1H-pyrimidine-2,4-(1H,3H)dione. Structural elucidation of this degradation product was carried out using MS, 1H NMR, 13C NMR, DEPT and IR spectral data. The formation of this impurity and its mechanism are discussed.
通过梯度反相 HPLC 检测,初始样品中存在
水平低于 0.1% 的未知杂质(降解产物)在
拉米夫定、
齐多夫定和
奈韦拉平口服混悬剂片剂的 50 °C 3M 稳定性样品中增加至 0.25%。使用反相制备型 HPLC 分离该降解产物。根据光谱数据,该降解产物的结构被表征为1-[
5-羟甲基-4-(5-甲基-2,3-二氢-[1,2,3]三唑-1-基)-
四氢呋喃-2-基]-5-甲基-1H-
嘧啶-2,4-(1H,3H)二酮。使用 MS、1H NMR、13C NMR、
DEPT 和 IR 光谱数据对该降解产物进行结构解析。讨论了这种杂质的形成及其机制。