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Interfacial structurization between triolein and water from pH and buffer ions.

Matteo Frigerio1, Rafael V M Freire1, Thereza A Soares2

  • 1Department of Chemistry, University of Fribourg, Chemin Du Musée 9, 1700 Fribourg, Switzerland.

Journal of Colloid and Interface Science
|March 28, 2024
PubMed
Summary
This summary is machine-generated.

Altering pH and buffer ions significantly modifies the oil/water interface, reducing interfacial tension and forming layers. This understanding aids in designing responsive materials and optimizing industrial processes.

Keywords:
AdsorptionBufferInterfacial TensionLiquid/liquid ellipsometryMolecular DynamicsOil/water interfaceTensiometry

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Area of Science:

  • Surface science
  • Physical chemistry
  • Materials science

Background:

  • Manipulating oil/water interfaces is crucial for industries like food, cosmetics, and detergents.
  • Elevated pH conditions can cause triglyceride hydrolysis, producing amphiphilic fatty acids.

Purpose of the Study:

  • To investigate pH-triggered changes at the triolein/water interface using different buffer systems.
  • To understand the formation of interfacial structures and compositional modifications.

Main Methods:

  • Utilized ellipsometry, tensiometry, and X-ray scattering to study interfacial structure.
  • Employed confocal Raman microscopy, NMR spectroscopy, and in silico modeling for compositional analysis.

Main Results:

  • Observed significant modification of the triglyceride/water interface by pH and buffer ions (PB, TRIS).
  • Demonstrated a decrease in interfacial tension from 32.4 to 2.2 mN/m with increasing pH (6.5 to 9.5).
  • Identified multilamellar interfacial layers forming around pH 9.0 with TRIS, attributed to oleic acid and TRIS interactions.

Conclusions:

  • pH and buffer ions play a critical role in modulating triglyceride/water interfaces.
  • Findings provide insights for designing pH- and ion-responsive functional materials.
  • The study offers optimization strategies for industrial processes involving triglyceride/water interfaces.