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Highlighting the Influence between Physical and Chemical Cross-Linking in Dynamic Hydrogels for Two-Photon
Antonella Fantoni1,2, Alice Salvadori2,3, Aleksandr Ovsianikov2,3
1Institute of Applied Synthetic Chemistry, Technische Universität Wien, Getreidemarkt 9, 1060 Vienna, Austria.
Biomacromolecules
|May 9, 2025
Summary
This study enhances photolabile hydrogel stability using gelatin macromers, improving network integrity. Localized degradation is achieved through two-photon micropatterning for advanced material applications.
Area of Science:
- Biomaterials Science
- Polymer Chemistry
- Hydrogel Engineering
Background:
- Photolabile hydrogels are crucial for materials and life sciences.
- Disulfide bonds offer light-sensitive cleavage but face stability issues.
- Thiol-disulfide metathesis causes network instability and swelling.
Purpose of the Study:
- To enhance the stability of photolabile hydrogels.
- To introduce tunable degradation properties.
- To demonstrate localized disulfide bond cleavage.
Main Methods:
- Incorporation of gelatin macromers into poly(vinyl alcohol) networks.
- Use of disulfide-containing dithiol cross-linkers for photolability.
- In situ photorheology, swelling, and degradation studies.
- Two-photon micropatterning for localized cleavage.
Main Results:
- Gelatin incorporation significantly improved network stability and reduced swelling.
- Tunable material properties were achieved by varying gelatin content.
- Successful localized disulfide cleavage was demonstrated via two-photon micropatterning.
Conclusions:
- Gelatin macromers effectively stabilize disulfide-based photolabile hydrogels.
- The developed hydrogels offer tunable properties and controlled degradation.
- Two-photon micropatterning enables precise spatial control over hydrogel cleavage.
