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Bulk and Thin Film Synthesis of Compositionally Variant Entropy-stabilized Oxides
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Emulsions Stabilized by Gum Arabic: Composition and Packing within Interfacial Films.

M Atgié1, O Masbernat1, K Roger1

  • 1Laboratoire de Génie Chimique, Université de Toulouse, CNRS, INPT, UPS , Toulouse 31432 , France.

Langmuir : the ACS Journal of Surfaces and Colloids
|December 4, 2018
PubMed
Summary
This summary is machine-generated.

Gum arabic stabilizes oil-in-water emulsions by forming protein-rich interfacial films. Adjusting gum concentration, pH, and salinity alters protein conformation, not composition, to control emulsion stability.

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Area of Science:

  • Food science and technology
  • Colloid and surface chemistry
  • Biopolymer science

Background:

  • Gum arabic, a natural hydrocolloid, is crucial for stabilizing oil-in-water emulsions in the food industry.
  • Its complex protein/polysaccharide structure suggests interfacial film composition differs from bulk solution.

Purpose of the Study:

  • To investigate the composition of interfacial films in gum arabic-stabilized emulsions.
  • To determine how formulation parameters (concentration, pH, salinity) affect interfacial film properties.

Main Methods:

  • Utilized size exclusion chromatography and hydrophobic interaction chromatography.
  • Analyzed oil/water emulsions stabilized by gum arabic under varying conditions.

Main Results:

  • The oil/water interface is enriched with irreversibly adsorbed protein-rich species of diverse sizes.
  • Surface coverage density increases with gum concentration and reduced ionic repulsion (higher ionic strength, lower pH).
  • Formulation changes primarily affect adsorbed species conformation, not their composition.

Conclusions:

  • Gum arabic interfacial films are primarily composed of protein-rich conjugates.
  • Adsorbed layer packing is modulated by conformation changes in response to formulation parameters.
  • Findings aid in optimizing gum arabic usage for stable emulsion production.