Thermosensitive and photocrosslinkable hydroxypropyl chitin-based hydrogels for biomedical applications

Area of Science:

• Biomaterials Science
• Polymer Chemistry
• Tissue Engineering

Background:

• Injectable hydrogels are crucial for tissue engineering but often suffer from poor stability and mechanical properties.
• Existing thermosensitive polymers lack sufficient mechanical integrity under physiological conditions.

Purpose of the Study:

• To develop novel injectable hydrogels with improved stability and mechanical strength for biomedical applications.
• To synthesize and characterize photocrosslinkable thermosensitive hydroxypropyl chitin (HPCH) hydrogels.

Main Methods:

• Synthesized thermosensitive hydroxypropyl chitin (HPCH) and functionalized it with methacrylate groups to create glycidyl methacrylate-modified HPCH (GM-HPCH).
• Investigated the sol-gel transition behavior of GM-HPCH at low concentrations (2 wt% in PBS).
• Photocrosslinked GM-HPCH hydrogels using UV irradiation under physiological conditions and evaluated their mechanical properties, swelling, and degradation.

Main Results:

• GM-HPCH polymers demonstrated reversible thermosensitive sol-gel transition behavior.
• Photocrosslinked GM-HPCH hydrogels exhibited enhanced stability and mechanical strength.
• Hydrogel properties could be tuned by adjusting the degree of methacrylate substitution and UV exposure time.
• Cytotoxicity tests confirmed the non-cytotoxic nature of the photocrosslinked thermogels.

Conclusions:

• Photocrosslinkable GM-HPCH thermogels offer a promising solution to overcome the limitations of traditional injectable hydrogels.
• These advanced hydrogels possess tunable properties and excellent biocompatibility, indicating significant potential for diverse biomedical applications.