溶解中介pH在基本药物-科波维无形固体分散的释放行为中的作用
Taiga Uekusa1, Siddhi S Hate2, Kirk A VanDer Kamp2
1Department of Industrial and Molecular Pharmaceutics, College of Pharmacy, Purdue University, West Lafayette, Indiana 47907, United States.
具有高药物负载的无形固体分散 (ASD) 显示出由于富含药物的层而依赖于pH的释放. 较低的药物负载ASD表现出由聚合物控制的pH独立释放,影响药物的生物可用性.
科学领域:
- 制药科学 制药科学
- 材料科学 材料科学 材料科学
- 药物运输 药物运输 药物运输
背景情况:
- 无形固体分散 (ASDs) 增强难溶性药物的生物可用性.
- 基于PVPVA的ASDs通常在较高的药物负载 (DLs) 上显示出减少的释放.
研究的目的:
- 研究溶解介质pH对基本药物-PVPVAASDs在各种药物负载下释放行为的影响.
- 在不同的pH条件下,了解影响PVPVA基于ASD的药物释放的潜在机制.
主要方法:
- 在pH范围 (1.67.5) 的PVPVA ASD中评估的表面积规范释放的洛拉塔丁 (LRD) 和里托纳维尔 (RTV) 释放率.
- 使用共聚焦光显微镜观察水合ASD紧表面的相形态.
- 在ASD中使用pH指标来评估凝层的pH梯度.
主要成果:
- 低DLASD显示出快速,pH独立的释放,由聚合物控制.
- 较高DL ASDs表现出pH依赖的释放,与富含药物的屏障层形成有关.
- 聚焦显微镜揭示了高DLASD的凝层-溶液接口上的富含药物的屏障层.
- 在凝层中观察到LRD-PVPVA ASD的pH梯度形成,但没有观察到RTV-PVPVA ASD.
结论:
- 中等pH显著影响较高DLASD的释放率,对于具有pH依赖溶解度的弱基础药物.
- 聚合物控制的低DL ASDs的释放受pH的影响较小.
- 这项研究提高了对基于PVPVA的ASD释放机制的理解,特别是关于药物负载和pH影响.
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