Morphology of polyanhydride microsphere delivery systems

Area of Science:

• Materials Science
• Biomedical Engineering
• Drug Delivery Systems

Background:

• Polyanhydride microspheres are utilized for controlled drug delivery.
• Understanding the relationship between fabrication method, microsphere morphology, and drug release is crucial for optimizing delivery systems.

Purpose of the Study:

• To elucidate the mechanism of polymer degradation and drug release in polyanhydride microspheres.
• To investigate the influence of different fabrication methods on microsphere morphology and drug release profiles.
• To demonstrate the utility of Scanning Electron Microscopy (SEM) in analyzing these processes.

Main Methods:

• Preparation of polyanhydride microspheres using solvent removal, solvent evaporation, and hot melt microencapsulation.
• Characterization of microsphere morphology using Scanning Electron Microscopy (SEM).
• In vitro and in vivo evaluation of drug release and polymer degradation, correlated with SEM observations.

Main Results:

• Distinct morphological characteristics were observed for microspheres prepared by different fabrication methods.
• SEM analysis successfully explained the observed in vitro and in vivo drug release profiles and polymer degradation behavior.
• The study confirmed the effectiveness of SEM in analyzing the impact of fabrication methods on drug release.

Conclusions:

• SEM is a powerful tool for understanding the interplay between polyanhydride microsphere fabrication, morphology, and drug release kinetics.
• Fabrication method significantly influences microsphere characteristics and subsequent drug delivery performance.
• SEM provides valuable insights for the rational design of polyanhydride-based drug delivery systems.