Preparation and Properties of Double-Crosslinked Hydroxyapatite Composite Hydrogels

Area of Science:

• Biomaterials Science
• Polymer Chemistry
• Tissue Engineering

Background:

• Natural polymer hydrogels offer good mechanical properties and biocompatibility.
• Developing advanced hydrogels with enhanced mechanical properties is crucial for tissue engineering applications.

Purpose of the Study:

• To design and synthesize hydroxyapatite-enhanced, photo-oxidized, double-crosslinked hydrogels.
• To investigate the effects of crosslinking density and hydroxyapatite incorporation on hydrogel properties.

Main Methods:

• Modification of hyaluronic acid (HA) and gelatin (Gel) with methacrylate anhydride.
• Introduction of catechin groups into HA for oxidative crosslinking.
• Formation of double-crosslinked hydrogels (HG) via photo-crosslinking and oxidative crosslinking.
• Incorporation of hydroxyapatite into HG to create HGH hydrogels.

Main Results:

• Increased crosslinking density led to higher stiffness, denser pore structure, improved anti-degradation, and reduced swelling.
• Hydroxyapatite incorporation significantly enhanced mechanical properties without altering stability or network structure.
• The developed hydrogels exhibited promising characteristics for tissue engineering scaffolds.

Conclusions:

• The designed double-crosslinked hydrogels, especially when enhanced with hydroxyapatite, demonstrate superior mechanical properties.
• These materials show potential for use as scaffolds in tissue engineering due to their tunable properties and enhanced performance.