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Poly(L-Tyrosine)-Containing Dehydropeptides: Hydrogels vs. Bioadhesives.

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  • 1Centre of Chemistry of the University of Minho (CQ-UM), University of Minho, 4710-057 Braga, Portugal.

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Summary

Researchers developed tyrosine-containing dehydropeptides that self-assemble into hydrogels and adhesive films. These peptide-based materials show tunable properties for biomedical and materials science applications.

Keywords:
bioadhesiveshydrogelsmechanical resilienceself-assemblytyrosine dehydropeptides

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Area of Science:

  • Biomaterials Science
  • Supramolecular Chemistry
  • Materials Science

Background:

  • Bioadhesive materials for aqueous conditions are crucial for biomedical and materials science.
  • Peptide-based systems offer tunable structures, biocompatibility, and supramolecular network formation via noncovalent interactions.

Purpose of the Study:

  • To investigate how molecular architecture influences self-assembly, hydrogel formation, and adhesive properties of tyrosine-containing dehydropeptides.
  • To explore structure-property relationships in dehydropeptide assemblies for adhesive material development.

Main Methods:

  • Synthesis of a focused library of tyrosine-containing dehydropeptides using a solution-phase Boc strategy.
  • Systematic variation of N-terminal protection and C-terminal functionality.
  • Characterization using rheology, scanning electron microscopy, and lap-shear tests.

Main Results:

  • N-protected dehydropeptides formed supramolecular hydrogels triggered by pH reduction and thermal cycling, exhibiting tunable viscoelastic properties (storage moduli up to tens of kilopascals).
  • Scanning electron microscopy revealed dense fibrous nanostructures in the hydrogels.
  • N,C-deprotected dehydropeptides formed cohesive films with significant adhesive performance on hydrophilic substrates, demonstrating high shear strength.

Conclusions:

  • Tyrosine-containing dehydropeptides serve as versatile building blocks for supramolecular adhesive materials.
  • Molecular architecture significantly impacts self-assembly, hydrogelation, and adhesive properties.
  • These peptide-based materials show promise for applications requiring robust adhesion in aqueous environments.