Self-Healing Gelatin Hydrogels Cross-Linked by Combining Multiple Hydrogen Bonding and Ionic Coordination

Area of Science:

• Materials Science
• Polymer Chemistry
• Biomedical Engineering

Background:

• Self-healing hydrogels are crucial for advanced material applications.
• Current research explores various physical and chemical cross-linking methods.
• Developing multifunctional and injectable hydrogels remains an active area of exploration.

Purpose of the Study:

• To fabricate injectable self-healing hydrogels by combining ionic coordination and hydrogen bonding.
• To investigate the effects of Fe3+ ionic coordination and ureido-pyrimidinone (UPy) hydrogen bonding on hydrogel properties.
• To explore the potential biological applications of these novel hydrogels, including drug release.

Main Methods:

• Preparation of gelatin-UPy-Fe hydrogels using a dual cross-linking strategy.
• Characterization of hydrogel formation and mechanical properties.
• In vitro drug release studies to assess potential biomedical applications.

Main Results:

• Successfully synthesized injectable hydrogels (gelatin-UPy-Fe) with excellent self-healing capabilities.
• Demonstrated that both Fe3+ ionic coordination and UPy quadruple hydrogen bonding contribute to hydrogel formation and mechanical strength.
• Observed promising in vitro drug release profiles, indicating potential for biomedical applications.

Conclusions:

• The developed gelatin-UPy-Fe hydrogels exhibit remarkable self-healing and injectability.
• The synergistic effect of ionic coordination and hydrogen bonding provides a versatile approach for designing advanced hydrogels.
• These hydrogels show significant promise for future applications in drug delivery and regenerative medicine.