Bajd Franci, Mikac Urša, Mohorič Aleš, Serša Igor
Jožef Stefan Institute, 1000 Ljubljana, Slovenia.
Department of Physics, Faculty of Mathematics and Physics, University of Ljubljana, 1000 Ljubljana, Slovenia.
Polymers (Basel). 2024 Feb 22;16(5):601. doi: 10.3390/polym16050601.
Polymer matrix tablets are an important drug-delivery system widely used for oral drug administration. Understanding the tablet hydration process, both experimentally and theoretically, is, thus, very important for the development of drug delivery systems that exhibit high drug loading capacity and controlled release potential. In this study, we used magnetic resonance microscopy (MRM) to nondestructively and dynamically analyze the water hydration process of xanthan-based tablets. The swelling process was characterized by well-resolved fronts of erosion, swelling, and penetration. The experimental results were complemented by numerical simulations of the polymer matrix hydration process. In the simulations, the polymer tablet matrix was modeled as an assembly of interacting chains with embedded drug particles, while its hydration process was mediated by interaction with solvent particles. The swelling dynamics were modeled within a Monte Carlo-based bond fluctuation model (BFM) that elegantly accounted for steric and nearest-neighbor interactions. This study provides an efficient experimental-theoretical approach for the study of polymer matrix swelling processes.
聚合物基质片剂是一种重要的药物递送系统，广泛用于口服给药。因此，从实验和理论两方面了解片剂的水化过程，对于开发具有高载药量和控释潜力的药物递送系统非常重要。在本研究中，我们使用磁共振显微镜（MRM）对基于黄原胶的片剂的水合过程进行了无损动态分析。溶胀过程的特征是具有清晰分辨的侵蚀、溶胀和渗透前沿。聚合物基质水化过程的数值模拟对实验结果进行了补充。在模拟中，聚合物片剂基质被建模为带有嵌入药物颗粒的相互作用链的集合，而其水化过程则通过与溶剂颗粒的相互作用来介导。溶胀动力学在基于蒙特卡洛的键涨落模型（BFM）中进行建模，该模型巧妙地考虑了空间位阻和近邻相互作用。本研究为聚合物基质溶胀过程的研究提供了一种有效的实验 - 理论方法。
