Bioinspired bioadhesive polymers: dopa-modified poly(acrylic acid) derivatives

Area of Science:

• Biomaterials Science
• Polymer Chemistry
• Adhesion Science

Background:

• Gastropod byssal fibers utilize Dopa for exceptional underwater adhesion.
• Development of synthetic bioadhesives with strong, tunable properties remains a challenge.
• Polyanhydride backbones offer versatile platforms for functionalization.

Purpose of the Study:

• To synthesize and characterize novel bioinspired bioadhesive polymers incorporating Dopa.
• To evaluate the adhesive properties of these new polymers on biological tissue.
• To compare the performance of Dopa-grafted polymers against a commercial benchmark.

Main Methods:

• One-step synthesis of polyanhydride-based polymers with grafted amino acid side chains (phenylalanine, tyrosine, Dopa).
• Characterization of polymer structure and properties.
• In vitro testing of bioadhesion, fracture strength, and tensile work on excised rat intestinal tissue.

Main Results:

• Successful synthesis of novel polyanhydride polymers with Dopa side chains.
• Dopa-grafted hydrophobic backbone polymers demonstrated up to 2.5x higher fracture strength.
• These Dopa-polymers exhibited 2.8x greater tensile work of bioadhesion compared to a commercial poly(acrylic acid) derivative.

Conclusions:

• Novel bioinspired polymers containing Dopa show promising bioadhesive capabilities.
• The Dopa moiety significantly enhances the mechanical properties of bioadhesion.
• These findings suggest potential applications for Dopa-based polymers in biomedical adhesion.