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Alternating Magnetic Field-Responsive Hybrid Gelatin Microgels for Controlled Drug Release

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Structured drug-eluting bioresorbable films: microstructure and release profile.

M Zilberman¹, Y Shifrovitch, M Aviv

¹Department of Biomedical Engineering, Faculty of Engineering Tel Aviv University, Tel Aviv 69978, Israel. meitalz@eng.tau.ac.il

Journal of Biomaterials Applications

|July 18, 2008

Summary

Researchers developed bioresorbable drug-eluting films with controlled drug release. Film structure, determined by solvent evaporation, influences drug dispersion and release profiles for biomedical applications.

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Area of Science:

Biomaterials Science
Polymer Chemistry
Drug Delivery Systems

Background:

Bioresorbable drug-eluting films offer versatile biomedical applications, including biodegradable medical devices and antibiotic coatings for implants.
These films combine mechanical support with controlled drug release, crucial for preventing infections and promoting healing.

Purpose of the Study:

To investigate the preparation and characterization of bioresorbable drug-loaded polymer films.
To analyze how film structure (drug location/dispersion) and processing parameters affect drug release profiles.
To explore the potential for engineering films with tailored drug release behaviors for specific applications.

Main Methods:

Preparation of two distinct film structures (A-type: surface crystals, B-type: bulk dispersion) via solution processing.
Analysis of the influence of solvent evaporation rate and drug hydrophilicity on film structuring.
Characterization of drug release profiles, including burst effect and release rate, in relation to film type and composition.

Main Results:

Film structure (A-type vs. B-type) is primarily dictated by solvent evaporation rate during film formation.
A-type films generally show a ~30% burst release followed by a constant rate, influenced by polymer weight loss.
B-type films exhibit low burst release, with drug release governed by the polymer degradation profile.

Conclusions:

The location and dispersion of drugs within bioresorbable films significantly impact their release kinetics.
Tailoring processing parameters and selecting appropriate polymer and drug components allow for the engineering of desired drug release profiles.
These findings enable the development of advanced bioresorbable drug-eluting film-based implants for diverse biomedical needs.