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Effect of Deep Eutectic Solvent Nanostructure on Phospholipid Bilayer Phases.

Saffron J Bryant1, Rob Atkin2, Gregory G Warr1

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Phospholipids form lamellar phases and vesicles in deep eutectic solvents (DESs). The stability of these phospholipid structures in DESs depends on the DES composition, particularly the cation

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Area of Science:

  • Biochemistry and Materials Science
  • Supramolecular Chemistry
  • Nanotechnology

Background:

  • Phospholipids are fundamental components of cell membranes, forming bilayer structures.
  • Deep eutectic solvents (DESs) are emerging as novel media for various chemical and biological applications.
  • Understanding phospholipid self-assembly in alternative solvents is crucial for developing new biomaterials and drug delivery systems.

Purpose of the Study:

  • To investigate the self-assembly behavior of phospholipids in a range of deep eutectic solvents (DESs).
  • To determine the influence of DES composition on phospholipid phase formation and stability.
  • To explore the nanostructure of DESs and their interaction with phospholipids.

Main Methods:

  • Solvent penetration experiments to assess phospholipid phase formation.
  • X-ray scattering to analyze the nanostructure of DESs and phospholipid assemblies.
  • Differential scanning calorimetry to determine phospholipid chain melting temperatures.

Main Results:

  • Phospholipids form lamellar phases and spontaneously generate vesicles in various DESs (alkylammonium halide salts with glycerol or ethylene glycol).
  • DESs exhibit nanostructure, influencing phospholipid behavior.
  • Phospholipid chain melting temperature, critical for bilayer stability, is modulated by DES components (cation, anion, H-bond donor).
  • Alkyl chain length of the DES cation significantly impacts phospholipid chain melting, with effects moderated by anion and H-bond donor structures.

Conclusions:

  • Deep eutectic solvents provide a versatile medium for phospholipid self-assembly into functional structures like vesicles.
  • The tunable nature of DESs allows for control over phospholipid phase behavior and stability.
  • This research opens avenues for using DESs in advanced materials, drug delivery, and nanotechnology.