Journal article
Antifouling and Mechanical Properties of Photografted Zwitterionic Hydrogel Thin-Film Coatings Depend on the Cross-Link Density
ACS biomaterials science & engineering, Vol.7(9), pp.4494-4502
09/13/2021
DOI: 10.1021/acsbiomaterials.1c00852
PMID: 34347419
Appears in UI Libraries Support Open Access
Abstract
Zwitterionic polymer networks have shown promise in reducing the short- and long-term inflammatory foreign body response to implanted biomaterials by combining the antifouling properties of zwitterionic polymers with the mechanical stability provided by cross-linking. Cross-link density directly modulates mechanical properties (i.e., swelling behavior, resistance to stress and strain, and lubricity) but theoretically could reduce desirable biological properties (i.e., antifouling) of zwitterionic materials. This work examined the effect of varying poly(ethylene glycol) dimethacrylate cross-linker concentration on protein adsorption, cell adhesion, equilibrium swelling, compressive modulus, and lubricity of zwitterionic thin films. Furthermore, this work aimed to determine the appropriate balance among each of these mechanical and biologic properties to produce thin films that are strong, durable, and lubricious, yet also able to resist biofouling. The results demonstrated nearly a 20-fold reduction in fibrinogen adsorption on zwitterionic thin films photografted on polydimethylsiloxane (PDMS) across a wide range of cross-link densities. Interestingly, either at high or low cross-link densities, increased levels of protein adsorption were observed. In addition to fibrinogen, macrophage and fibroblast cell adhesion was reduced significantly on zwitterionic thin films, with a large range of cross-link densities, resulting in low cell counts. The macrophage count was reduced by 30-fold, while the fibroblast count was reduced nearly 10-fold on grafted zwitterionic films relative to uncoated films. Increasing degrees of cell adhesion were noted as the cross-linker concentration exceeded 50%. As expected, increased cross-link density resulted in a reduced swelling but greater compressive modulus. Notably, the coefficient of friction was dramatically reduced for zwitterionic thin films compared to uncoated PDMS across a broad range of cross-link densities, an attractive property for insertional implants. This work identified a broad range of cross-link densities that provide desirable antifouling effects while also maintaining the mechanical functionality of the thin films.
Details
- Title: Subtitle
- Antifouling and Mechanical Properties of Photografted Zwitterionic Hydrogel Thin-Film Coatings Depend on the Cross-Link Density
- Creators
- Megan J Jensen - University of IowaAdreann Peel - University of IowaRyan Horne - University of IowaJamison Chamberlain - University of IowaLinjing Xu - University of IowaMarlan R Hansen - University of IowaC. Allan Guymon - University of Iowa
- Resource Type
- Journal article
- Publication Details
- ACS biomaterials science & engineering, Vol.7(9), pp.4494-4502
- DOI
- 10.1021/acsbiomaterials.1c00852
- PMID
- 34347419
- NLM abbreviation
- ACS Biomater Sci Eng
- ISSN
- 2373-9878
- eISSN
- 2373-9878
- Publisher
- American Chemical Society
- Grant note
- DOI: 10.13039/100000002, name: National Institutes of Health, award: R01DC012578, T32DC00040, UL1TR002537
- Language
- English
- Date published
- 09/13/2021
- Academic Unit
- Molecular Physiology and Biophysics; Chemical and Biochemical Engineering; Neurosurgery; Otolaryngology
- Record Identifier
- 9984197072402771
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