Controlled release of drugs from multi-component biomaterials

Area of Science:

• Biomaterials Science
• Polymer Chemistry
• Drug Delivery Systems

Background:

• Controlled drug release is crucial for effective long-term therapies like contraception and hormone replacement.
• Existing systems often face challenges in achieving precise and sustained drug delivery over extended periods.
• Multi-component systems offer potential for enhanced control through combined release mechanisms.

Purpose of the Study:

• To develop and characterize a novel multi-component drug delivery biomaterial.
• To investigate the drug release kinetics from a hydrogel matrix containing biodegradable microcarriers.
• To evaluate the potential of this system for long-term drug delivery applications.

Main Methods:

• Fabrication of a hydrogel matrix (2-hydroxyethyl methacrylate cross-linked by ethylene glycol dimethacrylate).
• Encapsulation of levonorgestrel (LNG) into biodegradable poly-epsilon-caprolactone (PCL) microspheres.
• Characterization of hydrogels (swelling, thermal properties) and PCL microspheres (SEM, size, loading, release).
• Evaluation of drug release from the composite hydrogel-microsphere assemblies.

Main Results:

• The composite biomaterial demonstrated tunable drug release profiles.
• Drug release was influenced by microcarrier permeability, degradation, and hydrogel diffusion.
• The system exhibited drug release obeying zero-order kinetics for extended durations.
• Scanning electron microscopy confirmed microsphere distribution within the hydrogel matrix.

Conclusions:

• The developed multi-component biomaterial effectively combines multiple release mechanisms for controlled drug delivery.
• This system shows promise for designing implantable devices requiring long-term, zero-order drug release.
• The tunable nature of the release profile makes it adaptable for various therapeutic needs, including contraception and hormone replacement therapy.