在固体脂质微粒中使用多态态修饰剂:结构修饰对药物释放性能的作用
Serena Bertoni1, Elena Simone2, Stefano Sangiorgi1
1Department of Pharmacy and Biotechnology, University of Bologna, Via S. Donato 19/2, Bologna 40127, Italy.
概括
液体添加剂修改了tristearin固体脂质微粒,加速了多态转变并改变了药物释放动力学. 一些添加剂释放时间延长,而另一些添加剂表现出随着时间的推移稳定的配置,突出了结构与性质的相关性.
科学领域:
- 材料科学 材料科学 材料科学
- 制药科学 制药科学
- 物理化学 物理化学
背景情况:
- 固体脂质微粒 (MPs) 是重要的药物输送系统.
- 三素MPs可以存在于不同的多态形式 (α和β),影响性质.
- 晶体修饰剂用于控制脂质结晶和粒子特征.
研究的目的:
- 调查素MPs的结构变化和药物释放特性之间的相关性.
- 为了评估四种液体添加剂 (异胺酸盐,乙烯酸盐,油酸,MCT) 作为晶体修饰剂的作用.
- 了解多态和超分子修饰如何影响药物释放行为.
主要方法:
- 合成含有5% (重量) 液体添加剂的素MPs.
- 同时同步机小角度X射线散射/广角X射线散射 (SAXS/WAXS) 和差分扫描热量计 (DSC) 用于多态过渡分析.
- 咖啡因 (15%和30%) 在水和生物相关介质中的体外药物释放研究.
主要成果:
- 所有添加剂都加速了从不稳定的α-三氨酸转变为稳定的β-三氨酸的多态转变.
- 在储存期间,MPs表现出结构修改,包括晶体包装压缩和晶体生长.
- 异氨基胺基酸,乙烯酸和MCT延长了咖啡因在水中的释放,使其运动向零级转移.
- 在生物相关介质中,由于MP侵蚀/消化,释放概况更高.
- 服用异氨基和乙烯酸盐的MP在6个月后显示出释放特征的变化,这与结构变化有关.
结论:
- 液体添加剂显著影响tristearin MPs的多态过渡和结构稳定性.
- 添加剂可以调节药物释放动力学,为控制释放配方提供潜力.
- 了解结构-性质关系是设计稳定和有效的基于脂质的药物递送系统的关键.
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