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Hydrogels from phospholipid vesicles.

D Gräbner1, H Hoffmann1, S Förster2

  • 1University of Bayreuth, BZKG, Gottlieb-Keim-Str. 60, 95448 Bayreuth, Germany.

Advances in Colloid and Interface Science
|April 3, 2014
PubMed
Summary
This summary is machine-generated.

Phospholipid dispersions transform into liquid crystalline phases and then into brittle gels upon cooling. These gels exhibit reduced water permeability and distinct solvent diffusion behaviors within vesicle bilayers.

Keywords:
DiacylphosphocholinGelsSwelling of dispersionsVesicles

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Area of Science:

  • Materials Science
  • Physical Chemistry
  • Biophysics

Background:

  • Phospholipid dispersions in water can form liquid crystalline phases (Lα).
  • These phases exhibit temperature-dependent transitions.
  • Co-solvents influence the phase behavior and vesicle structure.

Purpose of the Study:

  • To investigate the transformation of phospholipid dispersions into lyotropic liquid crystalline phases and subsequently into gels.
  • To characterize the structural and dynamic changes occurring during this phase transition.
  • To understand the role of co-solvents and temperature on phospholipid gel properties.

Main Methods:

  • Cryo-transmission electron microscopy (Cryo-TEM) and freeze-fracture TEM (FF-TEM) for structural analysis.
  • Pulsed-field gradient nuclear magnetic resonance (PFG-NMR) for diffusion studies.
  • Rheological measurements to assess mechanical properties.

Main Results:

  • Addition of co-solvents (glycerol, BG, PG) induces swelling of diacylphosphocholine dispersions into Lα phases above the Krafft temperature (Tm).
  • Cooling below Tm transforms Lα phases into birefringent gels, with vesicle bilayers transitioning from liquid to crystalline states.
  • Gels show reduced water/co-solvent permeability through crystalline bilayers and exhibit distinct solvent diffusion populations (free vs. trapped).
  • Maximum swelling achieved when solvent refractive index matches bilayer refractive index, minimizing inter-bilayer attraction.

Conclusions:

  • Phospholipid dispersions can form thermoreversible gels with distinct structural and dynamic properties.
  • The transition to a crystalline bilayer state in gels significantly alters membrane permeability and mechanical characteristics.
  • The resulting gels, even at low phospholipid concentrations, possess significant storage modulus but are brittle.