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A Tripeptide-Stabilized Nanoemulsion of Oleic Acid
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Palmitoylethanolamide gels edible oils.

Duncan Schwaller1, Yi Sui1, Alain Carvalho1

  • 1Université de Strasbourg, CNRS, Institut Charles Sadron, 23 rue du Loess, F67000 Strasbourg, France.

Food Chemistry
|March 25, 2022
PubMed
Summary

Palmitoylethanolamide (PEA) can gel edible oils at low concentrations, forming stable lamellar solid aggregates. These PEA gels exhibit distinct transitions upon heating, indicating a reversible change in physical state.

Keywords:
OilOleogelatorsOrganogelatorsPalmitoylethanolamidePhase diagram

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Area of Science:

  • Food science and technology
  • Materials science
  • Biochemistry

Background:

  • Palmitoylethanolamide (PEA) is a naturally occurring amide with a well-established safety profile for oral consumption.
  • Edible oils are widely used as food ingredients and delivery vehicles, but their liquid state can limit certain applications.

Purpose of the Study:

  • To investigate the gelling properties of Palmitoylethanolamide (PEA) in edible oils.
  • To characterize the structure and thermal behavior of PEA-based oil gels.

Main Methods:

  • Rheological measurements to determine gel strength and transitions.
  • Cryo-scanning electron microscopy (cryo-SEM) and optical microscopy for structural analysis.
  • Wide-angle X-ray scattering (WAXS) and differential scanning calorimetry (DSC) for thermal and structural characterization.

Main Results:

  • Palmitoylethanolamide (PEA) effectively gels edible oils at concentrations as low as 0.5 wt%, forming stable networks.
  • The formed gels exhibit significant elastic moduli (e.g., 9000 Pa at 2 wt% PEA).
  • Microscopy and WAXS reveal that PEA forms lamellar solid aggregates, and heating induces a reversible gel-to-sol transition followed by particle melting.

Conclusions:

  • Palmitoylethanolamide (PEA) is a novel and effective gelling agent for edible oils.
  • PEA oil gels demonstrate tunable physical properties and distinct thermal transitions, suggesting potential applications in food formulation and delivery systems.