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This study details a novel self-healing peptide gel with multiple responses. The oligopeptide gel exhibits pH responsiveness and unique temperature-dependent rheological properties in various solvents.

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Area of Science:

  • Biomaterials Science
  • Supramolecular Chemistry
  • Physical Chemistry

Background:

  • Oligopeptides can self-assemble into complex supramolecular structures.
  • Understanding peptide self-assembly is crucial for developing advanced biomaterials.
  • Acyl carrier protein (ACP) derived peptides offer unique self-assembly properties.

Purpose of the Study:

  • To synthesize and characterize a novel self-healing physical gel from an oligopeptide.
  • To investigate the multiple responsive behaviors of the gel in different solvent systems.
  • To elucidate the structural basis of the gel's properties and self-assembly mechanism.

Main Methods:

  • Preparation of 3% w/v ACP(65-74)-NH2 self-healing physical gels.
  • Morphological analysis using optical, birefringence, and confocal laser scanning microscopy.
  • Spectroscopic characterization including circular dichroism, FTIR, and fluorescence spectroscopy.
  • Rheological property evaluation under varying temperature and solvent conditions.

Main Results:

  • All gels demonstrated pH responsiveness with reversible sol-to-gel transitions.
  • Rheological properties were significantly influenced by temperature and solvent composition.
  • Gels in water exhibited peculiar thermoresponsive behavior akin to polymer solutions.
  • Structural analysis revealed the presence of beta-sheet structures and amyloid aggregates.

Conclusions:

  • The ACP(65-74)-NH2 peptide forms intrinsically multiple-responsive self-healing physical gels.
  • The study provides insights into amyloid fibrillation mechanisms in diverse solvent media.
  • These findings contribute to the design of advanced peptide-based smart materials.