A versatile pH sensitive chondroitin sulfate-PEG tissue adhesive and hydrogel

Area of Science:

• Biomaterials Science
• Polymer Chemistry
• Tissue Engineering

Background:

• Developing advanced hydrogels for biomedical applications is crucial.
• Existing tissue adhesives often have limitations in strength and biocompatibility.

Purpose of the Study:

• To synthesize and characterize a novel chondroitin sulfate-polyethylene glycol (CS-PEG) adhesive hydrogel.
• To evaluate its properties, including adhesion strength, biocompatibility, and degradation.

Main Methods:

• Functionalization of chondroitin sulfate (CS) with N-hydroxysuccinimide (NHS) to create CS-NHS.
• Crosslinking CS-NHS with polyethylene glycol amine (PEG-(NH2)6) to form the hydrogel.
• Assessment of hydrogel properties (stiffness, swelling, gelation kinetics, adhesion strength) and in vitro/in vivo biocompatibility.

Main Results:

• The CS-PEG hydrogel demonstrated tunable mechanical properties and gelation kinetics controlled by pH.
• Achieved adhesive strength ten times greater than fibrin glue for cartilage tissue.
• Encapsulated cells remained viable, and the material showed minimal inflammatory response in vivo.
• Demonstrated in vitro enzymatic degradation.

Conclusions:

• A novel CS-PEG adhesive hydrogel was successfully developed from biological and synthetic components.
• The hydrogel exhibits superior adhesive strength and excellent biocompatibility.
• This material holds significant promise for applications in wound healing and regenerative medicine.