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Evaluation of in situ curable biodegradable polyurethanes containing zwitterion components

  • Raju Adhikari
  • Stephen J. Danon
  • Penny Bean
  • Tam Le
  • Pathiraja Gunatillake
  • John A. M. Ramshaw
  • Jerome A. Werkmeister
Article

Abstract

Porous polyurethane networks containing covalently attached zwitterionic compounds dihydroxypolycaprolactone phosphorylcholine and 1,2-dihydroxy-N,N-dimethylamino-propane sulfonate have been prepared and characterised. Three polymers were prepared by reacting methyl 2,6-diisocyanato hexanoate functionalised d-glucose as prepolymer A with either polycaprolactone triol alone or with addition of 10 mol% zwitterion as prepolymer B. All polymer compositions were mixed with 10 wt% hydrated gelatin beads. The cured polymers with the gelatin beads showed compression strengths that were still suitable for use in articular cartilage repair. The incorporation of zwitterions yielded more hydrophilic polymers that showed increased water absorption and increased porosity. After four months degradation in phosphate buffered saline, the polymers containing zwitterions had approximately 50% mass loss compared with 30% mass loss for that with polycaprolactone triol alone. All polymers were non-toxic in chondrocyte-based assays. Subcutaneous implantation of these polymers into rats confirmed that the polymers degraded slowly. Only a very mild inflammatory response was observed and the polymers were able to support new, well vascularised tissue formation.

Keywords

Compressive Strength Compressive Modulus Zwitterion Polymer Degradation Increase Water Absorption 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgment

The authors would like to thank Professor Wei-Bor Tsai (Department of Chemical Engineering, National Taiwan University, Taiwan) for providing the gelatin beads.

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Copyright information

© Springer Science+Business Media, LLC 2009

Authors and Affiliations

  • Raju Adhikari
    • 1
  • Stephen J. Danon
    • 2
  • Penny Bean
    • 2
  • Tam Le
    • 1
  • Pathiraja Gunatillake
    • 1
  • John A. M. Ramshaw
    • 1
  • Jerome A. Werkmeister
    • 1
  1. 1.CSIRO Molecular and Health TechnologiesClayton SouthAustralia
  2. 2.CSIRO Molecular and Health TechnologiesNorth RydeAustralia

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