Multifractal Model for Oromucosal Polymeric Film Performance

Area of Science:

• * Pharmaceutical Sciences
• * Polymer Science
• * Materials Science

Background:

• * Oromucosal films are advanced dosage forms for oral drug delivery, requiring rapid hydration and controlled drug release.
• * Film performance hinges on complex interactions like wetting, swelling, and polymer relaxation, influenced by formulation.
• * A mechanistic model is crucial for correlating film composition and structure with performance outcomes.

Purpose of the Study:

• * To develop a Madelung-type multifractal model for predicting swelling, disintegration, and release readiness in chitosan/hydroxypropyl methylcellulose (HPMC) films.
• * To evaluate the model's relevance using twelve distinct film formulations.
• * To identify optimal film formulations for future drug delivery applications.

Main Methods:

• * Solvent casting was used to prepare twelve chitosan/HPMC films with varying plasticizer and disintegrant content.
• * Comprehensive characterization included physical, mechanical, and surface properties (e.g., wetting time, swelling, rupture resistance, surface roughness).
• * A multifractal model was applied to analyze water uptake, swelling dynamics, matrix integrity, and release readiness.

Main Results:

• * Formulation significantly impacted film hydration, mechanical strength, structural integrity, and surface characteristics.
• * Films F2 (starch-free, high-swelling, stable) and F7 (fast wetting, destabilizing, flexible) were identified as promising unloaded matrices.
• * The model successfully linked empirical characterization data to mechanistic interpretations of film behavior.

Conclusions:

• * The developed framework quantitatively connects conventional film characterization with mechanistic understanding.
• * Key parameters predict water penetration, swelling, matrix failure, mechanical suitability, and structural heterogeneity.
• * The study aids in selecting candidate films for Active Pharmaceutical Ingredient (API) loaded studies, though not validating drug release kinetics.