Hot-Melt Extrusion of Bupropion with Three Ethylcellulose Grades for Pellet Feedstock Preparation and Screw-Based 3D Printing of Sustained-Release Tablets.

چکیده اصلی

3D printing has emerged as a novel technology for producing personalized dosage forms tailored to patients' therapeutic needs. Hot-melt extrusion (HME) is commonly used to produce filaments for most extrusion-based 3D printers. This study aimed to investigate the effect of three different ethylcellulose (EC) grades (7N, 10N, and 20N) on the physicochemical properties, matrix restructuring, and sustained-release behavior of bupropion hydrochloride (BUP·HCl)-loaded tablets. The extrudates were fabricated using HME, pelletized, and used as feedstock for screw-based 3D printing, thereby overcoming the limitations of filament-based systems. The formulations were evaluated for drug release, hardness, swelling, and porosity before and after dissolution using micro-computed tomography (microCT). The influence of tablet geometry on drug release was also investigated. Morphology, crystallinity, and thermal properties were characterized using scanning electron microscopy (SEM), X-ray powder diffraction (XRPD), differential scanning calorimetry (DSC), and thermogravimetric analysis (TGA). All formulations exhibited sustained BUP·HCl release, with drug release decreasing as EC viscosity grade increased. Tablets prepared with higher-viscosity EC showed greater hardness, reduced swelling, and lower post-dissolution porosity. MicroCT analysis revealed raster-related internal pores in all tablets before dissolution. However, initial porosity did not correlate with release behavior; tablets containing EC 20N exhibited the highest initial porosity but the lowest post-dissolution porosity and slowest drug release, whereas EC 7N tablets showed the opposite trend. Larger, thinner tablets released drug faster due to higher surface-area-to-volume ratio. The findings demonstrate that EC molecular weight plays a critical role in governing hydration-driven matrix restructuring and controlling sustained-release behavior of the 3D-printed tablets.

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