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Characterization of polyurethane scaffold surface functionalization with diamines and heparin
Eric L W de Mulder1, Gerjon Hannink, Martin J W Koens
1Department of Orthopaedics, NCMLS, Radboud University Nijmegen Medical Centre, The Netherlands.
Journal of Biomedical Materials Research. Part A
|September 11, 2012
Summary
This study enhanced polyurethane scaffolds (PUs) for tissue engineering by adding heparin. The modified PUs show improved cell recognition and surface properties, but mechanical stiffness is reduced.
Area of Science:
- Biomaterials Science
- Tissue Engineering
- Polymer Chemistry
Background:
- Polyurethane scaffolds (PUs) exhibit good biocompatibility but lack essential cell recognition sites.
- Enhancing PU surface properties is crucial for effective tissue regeneration applications.
Purpose of the Study:
- To functionalize PU scaffolds with heparin to improve cell recognition.
- To evaluate the impact of heparin functionalization on scaffold properties.
Main Methods:
- Aminolysis of PU scaffolds to introduce free amine groups.
- Crosslinking of heparin onto the functionalized PU surface.
- Characterization using immunohistochemistry, mechanical testing (Young's modulus), and contact angle measurements.
Main Results:
- Aminolysis significantly increased free amine content by 230%.
- Heparin was successfully and homogeneously integrated throughout the 3D scaffold.
- Young's modulus decreased by 50%, and surface hydrophilicity increased (contact angle reduced).
Conclusions:
- Heparin functionalization enhances PU scaffolds' potential for tissue engineering by improving biocompatibility and cell interaction.
- Reduced mechanical stiffness necessitates caution for load-bearing applications.