Kinetics of the Acid Hydrolysis of Diazepam, Bromazepam, and Flunitrazepam in Aqueous and Micellar Systems
作者:Manuel E. Moro、Juncal Novillo-Fertrell、M. Mercedes Velazquez、Licesio J. Rodriguez
DOI:10.1002/jps.2600800513
日期:1991.5
kinetic study of the acid hydrolysis of aqueous diazepam, bromazepam, and flunitrazepam was carried out at 25 degrees C using a spectrophotometric method. For diazepam and flunitrazepam, the experimental pseudo first-order rate constant decreased as the acid concentration was increased. The contrary behavior was found in the case of bromazepam. A kinetic scheme that includes the hydrolysis reaction of both
使用分光光度法在25摄氏度下对地西epa,溴马西and和氟尼西epa的酸水解进行动力学研究。对于地西epa和氟尼西epa,随着酸浓度的增加,实验假一级速率常数降低。在溴西epa中发现相反的行为。包括药物的质子化和非质子化两种物质的水解反应的动力学方案可以解释这些结果。同样,在胶束聚集体[非离子型聚氧乙烯-23-十二烷醇(Brij 35);阳离子十六烷基三甲基溴化铵(CTAB); 在25℃下研究了阴离子癸基钠(SdeS),十二烷基(SDS)和十四烷基(STS)]。在非离子和阳离子胶束的情况下观察到的影响可忽略不计。阴离子胶束对反应速度产生抑制作用。随着表面活性剂的疏水性增加,该效果增加。所有这些事实都可以通过伪相位模型进行定量解释。