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Related Experiment Videos

Solvent-free protein encapsulation within biodegradable polymer foams.

David D Hile1, Michael V Pishko

  • 1Texas A&M University, Department of Chemical Engineering, College Station, Texas, USA.

Drug Delivery
|March 4, 2005
PubMed
Summary

This study developed a solvent-free method using supercritical carbon dioxide to create porous poly(lactide-co-glycolide) scaffolds for protein delivery. The technique effectively encapsulated basic fibroblast growth factor, maintaining its biological activity for sustained release.

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Area of Science:

  • Biomaterials Science
  • Polymer Chemistry
  • Drug Delivery Systems

Background:

  • Poly(lactide-co-glycolide) (PLGA) is a widely used biodegradable polymer for drug delivery.
  • Traditional methods for encapsulating proteins in PLGA often involve organic solvents, which can compromise protein integrity.
  • Developing solvent-free fabrication techniques is crucial for preserving the activity of sensitive biomolecules.

Purpose of the Study:

  • To develop and characterize a solvent-free method for fabricating microporous PLGA matrices containing encapsulated proteins.
  • To investigate the in vitro release kinetics of proteins from these matrices.
  • To assess the retention of biological activity of encapsulated basic fibroblast growth factor (bFGF).

Main Methods:

  • Fabrication of microporous PLGA matrices using supercritical carbon dioxide (SC-CO2) without organic solvents.

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  • Saturation of a polymer-protein mixture in SC-CO2, followed by CO2 evaporation to create a porous structure.
  • In vitro release studies and biological activity assays for encapsulated bFGF.

    • Main Results:

    • A solvent-free method successfully produced microporous PLGA foams with encapsulated proteins.
    • Protein release occurred over 3 weeks, with a significant initial burst within 48 hours.
    • Encapsulated bFGF demonstrated sustained release for up to 10 days with minimal loss of biological activity.

    Conclusions:

    • Supercritical carbon dioxide is an effective medium for solvent-free fabrication of protein-loaded PLGA matrices.
    • This technique offers a promising approach for controlled and sustained delivery of bioactive proteins.
    • The method preserves the biological function of encapsulated growth factors, such as bFGF, for potential therapeutic applications.