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Abstract
This study investigated the influence of solute-solvent quotients on the physicochemical properties and release kinetics of two amitryptyline-loaded polyamide 6,10 (PA 6,10) monolithic matrices, Formulations A and B (FA and FB). The molecular mass, crystallinity, structural elucidation and thermo-transitions were assessed using mass spectrophotometry, X-ray diffraction, FTIR and DSC. Surface morphologies of the matrices and physicomechanical strength were captured using SEM and textural analysis. Drug release, distension and matrix erosion were evaluated using mathematical modeling. FA and FB displayed overall drug release fractions of 0.58 and 0.92 with 55% and 30% of matrix remaining over 24 hours, respectively. The indentation diameters (FA = 1.51 mm; FB = 2.39 mm), deformation energies (FA = 0.02 J; FB = 0.03 J) and Brinell Hardness Numbers (FA = 17.88 N/mm2; FB = 14.45 N/mm2) were divergent. SEM revealed irregular matrix surfaces with varying pore distributions. Minimal shifts in the structural backbone of PA 6,10 and semi-crystallinity was noted. Multiple reversible and irreversible thermal transitions with molar masses of FA = 345.2 g/mol and FB = 307.2 g/mol were obtained. Drug release supported by in vivo studies provided sustained plasma levels of amitryptyline (Tmax = 24 ± 0.5 h and 12 ± 0.5 h; Cmax = 0.024 ± 0.003 μg/mL and 0.036 ± 0.002 μg/mL for FA and FB, respectively) compared to a conventional formulation, Trepiline® (Tmax = 4 ± 0.5 h and Cmax = 0.05 ± 0.002 μg/mL). The physicochemical properties of both formulations were reversibly influenced by differences in the PA 6,10 solute-solvent quotient employed during development.