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Porous polylactide/chitosan scaffolds for tissue engineering.

Ying Wan1, Ya Fang, Hua Wu

  • 1Department of Chemistry and Chemical Engineering, Royal Military College of Canada, Kingston, Ontario, Canada K7K 7B4. ying.wan@rmc.ca

Journal of Biomedical Materials Research. Part A
|October 20, 2006
PubMed
Summary

Biodegradable polylactide/chitosan scaffolds with tunable porosity were created. These advanced scaffolds demonstrate enhanced hydrophilicity, controlled degradation, and improved mechanical properties for potential biomedical applications.

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Area of Science:

  • Biomaterials Science
  • Polymer Chemistry
  • Tissue Engineering

Background:

  • Biodegradable polymers are crucial for tissue engineering scaffolds.
  • Polylactide and chitosan offer complementary properties but require optimized fabrication.
  • Controlling scaffold architecture and degradation is key for effective applications.

Purpose of the Study:

  • To fabricate novel porous scaffolds using polylactide/chitosan blends.
  • To optimize processing parameters for desired structural and mechanical properties.
  • To evaluate the hydrophilicity, degradation behavior, and mechanical integrity of the scaffolds.

Main Methods:

  • Fabrication via a combinational technique: solvent-extracting, liquid-solid separation, and freeze-drying.
  • Optimization of processing parameters to control porosity (50-85%) and pore size (2-190 µm).
  • Assessment of hydrophilicity (swelling index), in vitro degradation (PBS, 37°C, 10 weeks), and mechanical properties (compressive strength, toughness).

Main Results:

  • Achieved well-distributed, interconnected porous structures with controllable porosity and pore size.
  • Demonstrated significantly improved hydrophilicity and delayed degradation due to chitosan's buffering effect.
  • Maintained well-defined compressive mechanical properties with enhanced toughness from polylactide/chitosan blending.

Conclusions:

  • The developed polylactide/chitosan porous scaffolds possess tunable properties suitable for biomedical applications.
  • Chitosan incorporation effectively mitigates acidic degradation products and enhances scaffold longevity.
  • The optimized fabrication method yields scaffolds with desirable structural, mechanical, and degradation characteristics.