Hydrazone self-crosslinking of multiphase elastin-like block copolymer networks

Area of Science:

• Biomaterials Science
• Polymer Chemistry
• Protein Engineering

Background:

• Recombinant elastin-like protein (ELP) triblock copolymers form elastomeric hydrogels via physical crosslinking.
• Physically crosslinked networks have limited mechanical strength.
• Existing chemical crosslinking methods for ELPs are suboptimal and may not be biocompatible.

Purpose of the Study:

• To develop an improved chemical crosslinking strategy for ELP hydrogels.
• To enhance the mechanical properties of ELP-based materials.
• To explore biocompatible in situ formation of crosslinked ELP hydrogels.

Main Methods:

• Modification of two recombinant elastin-like proteins with aldehyde and hydrazide functionalities.
• Self-crosslinking of modified ELPs via hydrazone bond formation upon mixing.
• Evaluation of water content, swelling, and mechanical properties (tensile and compressive tests) of the crosslinked hydrogels.

Main Results:

• Successful self-crosslinking of modified ELPs through stable hydrazone bonds without initiators or by-products.
• Hydrazone crosslinking significantly increased the mechanical strength of the ELP polymers.
• The crosslinked materials exhibited controlled water content and swelling behavior.

Conclusions:

• Hydrazone crosslinking is an effective and viable strategy for strengthening elastin-like protein polymers.
• This method enables the formation of robust, chemically crosslinked ELP hydrogels.
• The approach is suitable for biocompatible in situ formation of advanced ELP hydrogels with combined chemical and physical crosslinking.