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Ion-Triggered Hydrogels Self-Assembled from Statistical Copolypeptides.

Bing Wu1,2, Saltuk B Hanay1, Scott D Kimmins3

  • 1Department of Chemistry, RCSI University of Medicine and Health Sciences, Dublin 2, Ireland.

ACS Macro Letters
|May 16, 2022
PubMed
Summary

New statistical copolypeptides made of lysine and tyrosine exhibit unique ion-induced gelation. This controllable hydrogel behavior is achieved through specific secondary structure formation, offering tunable properties for advanced applications.

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Biomaterials

Background:

  • Copolypeptides are polymers composed of two or more different amino acids.
  • Hydrogels are water-swollen polymer networks with diverse applications.
  • Controlling hydrogel properties is crucial for their effective use.

Purpose of the Study:

  • To report novel statistical copolypeptides with lysine and tyrosine.
  • To investigate the unprecedented ion-induced gelation behavior of these copolypeptides.
  • To explore the mechanism behind the gelation and tune the hydrogel properties.

Main Methods:

  • One-step N-carboxyanhydride (NCA) ring-opening polymerization for copolypeptide synthesis.
  • In situ small-angle X-ray scattering (SAXS) for gelation mechanism studies.
  • Optical spectroscopy and transmission electron microscopy (TEM) for structural analysis.

Main Results:

  • Statistically polymerized lysine/tyrosine copolypeptides exhibit unique ion-induced gelation.
  • Gelation is driven by salt ion-induced intermolecular β-sheet formation and α-helix aggregation.
  • This behavior is specific to statistical lysine/tyrosine arrangements and not observed in other combinations.
  • Hydrogel diffusion and mechanical properties are tunable by adjusting polypeptide chain length and ion strength.

Conclusions:

  • The study presents novel lysine/tyrosine statistical copolypeptides with tunable ion-induced gelation.
  • The findings reveal a unique gelation mechanism involving specific secondary structures.
  • These tunable hydrogels hold potential for advanced material applications.