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Assembly and Characterization of Polyelectrolyte Complex Micelles
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Engineering Peptide-Based Polyelectrolyte Complexes with Increased Hydrophobicity.

Sara Tabandeh1, Lorraine Leon2,3

  • 1Department of Materials Science and Engineering, University of Central Florida, Orlando, FL 32816, USA. sara.tabandeh@Knights.ucf.edu.

Molecules (Basel, Switzerland)
|March 3, 2019
PubMed
Summary
This summary is machine-generated.

Hydrophobically-patterned peptides were designed to explore hydrophobicity

Keywords:
chiralitycoacervatesencapsulationhydrophobicitypolyelectrolyte complexespolypeptidesself-assembly

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Biotechnology

Background:

  • Polyelectrolyte complexation is a key method for creating self-assembled materials.
  • Understanding the influence of hydrophobicity on electrostatic self-assembly is crucial for material design.

Purpose of the Study:

  • To rationally design and synthesize ionic hydrophobically-patterned peptides.
  • To investigate the precise role of hydrophobicity in electrostatic self-assembly.
  • To explore the application of these peptide-based materials for hydrophobic dye encapsulation.

Main Methods:

  • Peptide synthesis with alternating d-/l-chiral patterns of charged and hydrophobic amino acids (lysine/glutamic acid with glycine/alanine/leucine).
  • Characterization using mass spectrometry, circular dichroism, and NMR spectroscopy (¹H, ¹⁹F).
  • Polyelectrolyte complex (PEC) characterization via turbidity measurements, optical microscopy, and infrared spectroscopy.

Main Results:

  • Critical salt concentration of PECs increased with charge density and hydrophobicity.
  • PEC formation increased with temperature for hydrophobic peptides, unlike purely ionic PECs.
  • Encapsulation efficiency of hydrophobic dye increased with the hydrophobic content of the PECs.

Conclusions:

  • Hydrophobicity significantly influences polyelectrolyte complex stability and behavior.
  • Hydrophobically-patterned peptides offer tunable properties for self-assembled materials.
  • These peptide complexes show promise for hydrophobic drug delivery applications.