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Microcapsules through polymer complexation. I: Complex coacervation of polymers containing a high charge density
S Wen1, X N Yin, W T Stevenson
1Department of Chemistry, Wichita State University, KS 67208.
Biomaterials
|May 1, 1991
Summary
Researchers created novel microcapsules from acidic and basic polymers for potential use in organ transplantation prostheses. These biocompatible capsules demonstrated short-term cell viability, showing promise for regenerative medicine applications.
Area of Science:
- Polymer Chemistry
- Biomaterials Science
- Regenerative Medicine
Background:
- Methacrylate polymers, including methacrylic acid (MAA) and dimethylaminoethyl methacrylate (DMAEMA), are versatile materials.
- Complex coacervation is a phase separation phenomenon driven by electrostatic interactions between oppositely charged polymers.
- Developing biocompatible microcapsules is crucial for applications like tissue engineering and drug delivery.
Purpose of the Study:
- To synthesize and characterize acidic (MAA) and basic (DMAEMA) methacrylate co- and ter-polymers.
- To investigate the relationship between polymer properties (pKa/pKb/pH), solubility, and ionization.
- To develop microcapsule-forming systems using complex coacervation for potential organ transplantation prostheses.
Main Methods:
- Solution free radical polymerization for polymer synthesis.
- Nuclear Magnetic Resonance (NMR) spectroscopy and dilute solution viscometry for structural characterization.
- Acid/base titration to determine pKa/pKb/pH, solubility, and ionization.
- Measurement of complex coacervate yields and equilibrium water content.
- Development and testing of microcapsule systems with erythrocytes for cell viability.
Main Results:
- Successfully synthesized and characterized acidic and basic methacrylate polymers.
- Established clear relationships between polymer ionization, pH, and solubility.
- Quantified coacervate formation and water content, optimizing for microcapsule fabrication.
- Demonstrated short-term viability of erythrocytes encapsulated within the developed microcapsule systems.
Conclusions:
- Acidic and basic methacrylate polymers can form complex coacervates suitable for microcapsule development.
- These microcapsules show potential as biocompatible scaffolds for organ transplantation prostheses.
- Further research is warranted to assess long-term viability and functional integration in transplantation models.