National Research Center for High-Efficiency Grinding, College of Mechanical and Vehicle Engineering, Hunan University, No. 2 Lushan South Road, Changsha 410082, China.
State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, No. 2 Lushan South Road, Changsha 410082, China.
Mol Pharm. 2022 Aug 1;19(8):2854-2867. doi: 10.1021/acs.molpharmaceut.2c00217. Epub 2022 Jul 8.
This paper treats the drug release process as a phase-field problem and a phase-field model capable of simulating the dynamics of multiple moving fronts, transient drug fluxes, and fractional drug release from swellable polymeric systems is proposed and validated experimentally. The model can not only capture accurately the positions and movements of the distinct fronts without tracking the locations of fronts explicitly but also predict well the release profile to the completion of the release process. The parametric study has shown that parameters including water diffusion coefficient, drug saturation solubility, drug diffusion coefficient, initial drug loading ratio, and initial porosity are critical in regulating the drug release kinetics. It has been also demonstrated that the model can be applied to the study of swellable filaments and has wide applicability for different materials. Due to explicit boundary position tracking being eliminated, the model paves the way for practical use and can be extended for dealing with geometrically complex drug delivery systems. It is a useful tool to guide the design of new controlled delivery systems fabricated by fused filament fabrication.
本文将药物释放过程视为一个相场问题，并提出了一个能够模拟多移动前沿、瞬态药物通量和溶胀聚合物系统分数药物释放动力学的相场模型，并通过实验进行了验证。该模型不仅能够准确地捕捉到不同前沿的位置和运动，而无需显式地跟踪前沿的位置，还能够很好地预测释放曲线直至释放过程完成。参数研究表明，包括水扩散系数、药物饱和溶解度、药物扩散系数、初始药物装载比和初始孔隙率在内的参数对药物释放动力学的调节至关重要。此外，还证明了该模型可应用于溶胀长丝的研究，并且对不同材料具有广泛的适用性。由于消除了显式边界位置跟踪，该模型为实际应用铺平了道路，并可扩展用于处理几何形状复杂的药物输送系统。它是指导通过熔融沉积制造新的控释系统设计的有用工具。
