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Related Concept Videos

Peptide Bonds02:43

Peptide Bonds

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A peptide bond covalently attaches amino acids through a dehydration reaction. One amino acid's carboxyl group and another amino acid's amino group combine, releasing a water molecule. The resulting bond is the peptide bond. The products that such linkages form are peptides. As more amino acids join this growing chain, the resulting chain is a polypeptide. Each polypeptide has a free amino group at one end. This end has the N-terminal, or the amino-terminal, and the other end has a free...
73.8K

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Author Spotlight: Improving the Production of Self-Assembling Fibers and Peptide Hydrogels for Superior Biocompatibility
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Gelation behavior of short protected peptides in organic medium.

Thomas M FitzSimons1, Israt Jahan Duti1, Nathaniel Conrad1

  • 1McKetta Department of Chemical Engineering, The University of Texas at Austin, Austin, USA. arosales@che.utexas.edu.

Soft Matter
|May 23, 2025
PubMed
Summary

This study shows that protected lysine-tyrosine-phenylalanine (KYF) peptides can form gels in organic solvents like dichloromethane. These peptide organogels share structural similarities with aqueous gels but exhibit distinct mesoscale assembly and rheological properties.

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Area of Science:

  • Supramolecular Chemistry
  • Materials Science
  • Organic Chemistry

Background:

  • Peptide gelators are well-studied in aqueous systems for biomedical uses.
  • Peptide gelation in organic solvents is less understood, despite organic solvent use in synthesis and organogel applications.

Purpose of the Study:

  • To investigate the gelation behavior of a short peptide sequence (lysine-tyrosine-phenylalanine, KYF) in an organic medium (dichloromethane).
  • To characterize the structure and properties of peptide-based organogels formed from protected KYF peptides.

Main Methods:

  • Gelation studies of protected KYF peptides in dichloromethane.
  • Structural analysis using Fourier transform infrared spectroscopy (FTIR).
  • Morphological characterization via transmission electron microscopy (TEM) and dynamic light scattering (DLS).
  • Rheological property assessment.

Main Results:

  • Protected KYF peptides successfully formed gels in dichloromethane at concentrations comparable to deprotected peptides in water.
  • FTIR confirmed antiparallel β-sheet structures in both aqueous and organogels.
  • TEM and DLS revealed short, anisotropic particles in DCM organogels, contrasting with the entangled fibers of aqueous gels.
  • Rheological tests showed protected KYF organogels behave like colloidal gels, exhibiting shear thinning and a strain-dependent gel-to-fluid transition.

Conclusions:

  • Peptide gelation is achievable in organic solvents like DCM using protected short peptide sequences.
  • The assembly and mesoscale structure of peptide gels differ significantly between aqueous and organic environments.
  • Understanding peptide assembly in organic media is crucial for optimizing synthesis and applications of peptide-based organogels.