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Measurement of Covalent Bond Formation in Light-Curing Hydrogels Predicts Physical Stability under Flow
Jonathan M Zatorski1, Isabella L Lee1, Jennifer E Ortiz-Cárdenas2
1Department of Chemistry, University of Virginia, 409 McCormick Road, Charlottesville, Virginia 22904, United States.
Analytical Chemistry
|December 3, 2024
Summary
This study introduces a novel method using NMR spectroscopy on enzymatically degraded hydrogels to precisely measure cross-linking. This technique predicts material stability for tissue engineering applications.
Area of Science:
- Biomaterials Science
- Polymer Chemistry
- Tissue Engineering
Background:
- Photo-crosslinking hydrogels are vital for tissue engineering but optimizing their stability under physiological conditions, especially in microfluidic devices, remains challenging.
- Predicting gel stability is difficult due to limitations in monitoring solid-state hydrogels and the influence of feature size on mechanical integrity.
Purpose of the Study:
- To develop a reliable method for monitoring the degree of cross-linking (DoC) in photo-crosslinked hydrogels.
- To predict the stability of hydrogel materials under fluid flow and assess their suitability for applications like photopatterning.
Main Methods:
- Utilized 1H NMR spectroscopy on enzymatically degraded hydrogels to enable high-resolution analysis of cross-linking.
- Investigated two types of photo-crosslinkable hydrogels: methacryloyl-modified gelatin and a composite of thiol-modified gelatin and norbornene-terminated polyethylene glycol.
- Correlated the measured DoC with material stability under fluid flow and as a function of light exposure and wavelength.
Main Results:
- NMR analysis of enzyme-digested gels accurately quantified the DoC in both tested hydrogel systems.
- A critical DoC threshold was identified for the stability of patterned hydrogel features, with smaller features requiring higher DoC.
- The measured DoC effectively predicted the stability of complex patterned structures created via photopatterning.
Conclusions:
- Enzymatic degradation followed by solution NMR provides a powerful tool for quantifying cross-linking in photo-crosslinked hydrogels.
- This method enables accurate prediction of hydrogel stability, crucial for designing materials for demanding applications like bioprinting and microfluidics.
- Quantifying chemical cross-links accelerates the development of advanced hydrogel materials for tissue engineering and regenerative medicine.
