Self-Cross-Linkable Chitosan-Alginate Complexes Inspired by Mussel Glue Chemistry

Area of Science:

• Biomaterials Science
• Polymer Chemistry
• Surface Chemistry

Background:

• Chitosan and alginate are biocompatible polysaccharides with potential in various applications.
• Developing self-cross-linking hydrogels is crucial for advanced material design.
• Mussel-inspired chemistry offers a versatile platform for biopolymer modification.

Purpose of the Study:

• To develop self-cross-linkable chitosan-alginate (Chi-Alg) complexes using mussel-inspired chemistry.
• To investigate the effect of catechol substitution on chitosan (ChiC) and alginate (AlgC) on complex properties.
• To evaluate the self-cross-linking and cohesive properties of modified Chi-Alg complexes.

Main Methods:

• Biopolymers (chitosan and alginate) were substituted with catechol groups.
• Four complex combinations (Chi-Alg, ChiC-Alg, Chi-AlgC, ChiC-AlgC) were prepared.
• Quartz Crystal Microbalance with Dissipation Monitoring (QCM-D) and lap shear adhesion tests were employed.

Main Results:

• Complexes with catechol modification only on chitosan (ChiC-Alg) showed no significant difference from the control (Chi-Alg).
• Complexes with catechol modification on alginate (Chi-AlgC and ChiC-AlgC) exhibited self-cross-linking capabilities.
• Enhanced cohesive properties were observed in alginate-modified complexes.

Conclusions:

• Catechol modification on alginate is key for achieving self-cross-linking and improved cohesion in Chi-Alg complexes.
• Mussel-inspired chemistry provides an effective strategy for functionalizing biopolymers.
• The developed self-cross-linkable Chi-Alg complexes hold promise for advanced biomaterial applications.