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Related Experiment Videos

Microencapsulation of oils using whey protein/gum Arabic coacervates.

F Weinbreck1, M Minor, C G de Kruif

  • 1NIZO food research, PO Box 20, 6710 BA Ede, The Netherlands. fanny.weinbreck@nizo.nl

Journal of Microencapsulation
|March 15, 2005
PubMed
Summary

Whey protein/gum arabic complex coacervation effectively microencapsulates oils, achieving high payloads (>80%) at pH 4.0. Capsule size impacts flavor release in food matrices, with larger capsules and cross-linked structures showing varied release rates.

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Composition and structure of whey protein/gum arabic coacervates.

Biomacromolecules·2004

Area of Science:

  • Food Science
  • Colloid and Surface Chemistry
  • Materials Science

Background:

  • Complex coacervation using whey protein/gum arabic (WP/GA) is a promising technique for microencapsulation.
  • Understanding the influence of pH and droplet size on microcapsule formation and stability is crucial for optimizing delivery systems.

Purpose of the Study:

  • To investigate the microencapsulation of sunflower oil, lemon, and orange oil flavors using WP/GA complex coacervation.
  • To determine the optimal pH conditions for stable microcapsule formation and high oil payload.
  • To evaluate the impact of capsule size and cross-linking on flavor release in a food matrix.

Main Methods:

  • Complex coacervation of whey protein and gum arabic at varying pH levels.
  • Microencapsulation of oil droplets and characterization of capsule shell formation.

Related Experiment Videos

  • Emulsion stability studies, including creaming rate and zeta potential measurements.
  • Flavor release assessment of microcapsules incorporated into Gouda cheese.

    • Main Results:

    • Optimal microencapsulation occurred near pH 4.0, yielding smooth biopolymer shells and high oil payloads (>80%).
    • Smaller oil droplets were more effectively encapsulated than larger ones.
    • Emulsion stability was pH-dependent, with higher creaming rates observed at pH 4.0 due to near-neutral zeta potential.
    • Larger microcapsules and covalently cross-linked capsules exhibited stronger and lower flavor release, respectively.

    Conclusions:

    • WP/GA complex coacervation is effective for microencapsulating oils, with pH being a critical factor for shell formation and stability.
    • Capsule size and cross-linking significantly influence flavor release kinetics, offering tunable delivery properties for food applications.