Mechanically robust and stretchable silk/hyaluronic acid hydrogels

Area of Science:

• Biomaterials Science
• Polymer Chemistry
• Tissue Engineering

Background:

• Hyaluronic acid (HA) and silk fibroin (SF) are biocompatible polymers with distinct properties.
• Individual applications of HA and SF are limited by their inherent material characteristics.
• Combining HA and SF could yield advanced hydrogels with expanded functionalities.

Purpose of the Study:

• To develop mechanically robust and stretchable hydrogels by integrating silk fibroin and hyaluronic acid.
• To investigate the synergistic effects of SF and HA on hydrogel properties.
• To explore novel biomaterials for biomedical applications.

Main Methods:

• Preparation of silk fibroin/hyaluronic acid (SF/HA) hydrogels using methacrylated HA (MeHA) and SF.
• Inclusion of N, N-dimethylacrylamide (DMAA) as a spacer for MeHA crosslinking.
• Characterization of hydrogel mechanical properties, including strength and stretchability.

Main Results:

• SF/HA hydrogels exhibited significantly enhanced mechanical strength compared to HA hydrogels alone.
• The β-sheet domains of SF acted as physical cross-links, reinforcing the HA matrix.
• Improved energy dissipation under strain contributed to the superior mechanical performance of SF/HA hydrogels.

Conclusions:

• The developed SF/HA hydrogels demonstrate superior mechanical robustness and stretchability.
• The combination of SF and HA offers a promising strategy for creating advanced biomaterials.
• These findings pave the way for novel applications in regenerative medicine and beyond.