Effect of Liposomes on the Rate of Alkaline Hydrolysis of Indomethacin and Acemetacin
作者:C. Matos、H. Chaimovich、J.L.F.C. Lima、I.M. Cuccovia、S. Reis
DOI:10.1002/1520-6017(200103)90:3<298::aid-jps5>3.0.co;2-1
日期:2001.3
degradation. The substrate association constants to HDPC micelles were 1335 and 2192 M(-1) for INDO and ACE, respectively, whereas the corresponding values for PC vesicles were 612 and 3050 M(-1). The difference was attributed to the additional hydrophobicity of ACE. The inhibitory effect of HDPC micelles and PC vesicles was quantified by calculating the ratio between the rate constants in water (k(w))
消炎痛,镇痛和解热药消炎痛(INDO)和醋乙酰胺(ACE)被广泛用于治疗变性或炎性疾病,具有明显的胃刺激作用,在中性pH下水溶性低,并在碱。正在研究替代制剂以获得具有较低毒性和较高稳定性的产品。在这里,我们以胶束为参考,研究脂质体电荷对INDO和ACE碱分解速率的影响。使用两相分离模型分析两性离子十六烷基磷酸胆碱(HDPC)胶束和磷脂酰胆碱(PC)脂质体的ACE和INDO结合,以量化这些聚集体对碱性降解速率的影响。对于INDO和ACE,与HDPC胶束的底物缔合常数分别为1335和2192 M(-1),而PC囊泡的相应值为612和3050 M(-1)。差异归因于ACE的附加疏水性。HDPC胶束和PC囊泡的抑制作用通过计算水(k(w))和总量(k(m))的速率常数之比来量化。HDPC胶束中INDO和ACE的k(w)/ k(m)比值分别为80和42,在PC脂质体中,这些比值分别为21和3.7。带