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Related Experiment Videos

Microencapsulating properties of sodium caseinate.

S A Hogan1, B F McNamee, E D O'Riordan

  • 1Department of Food Science, Faculty of Agriculture, University College Dublin, Belfield, Dublin 4, Ireland.

Journal of Agricultural and Food Chemistry
|April 20, 2001
PubMed
Summary
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Spray drying sodium caseinate (Na Cas) and soy oil emulsions resulted in powders with lower microencapsulation efficiency at higher oil/protein ratios. High oil content destabilized emulsions during drying.

Area of Science:

  • Food Science
  • Colloid and Surface Science
  • Materials Science

Background:

  • Emulsification and spray-drying are key processes for producing powdered food ingredients.
  • Sodium caseinate (Na Cas) is a common emulsifier in food systems.
  • Understanding the impact of formulation and processing on emulsion stability and powder properties is crucial for product development.

Purpose of the Study:

  • To investigate the effect of oil/protein ratio and homogenization pressure on emulsion properties and spray-dried powder characteristics.
  • To evaluate the microencapsulation efficiency (ME) and redispersion properties of the resulting powders.
  • To determine the structural integrity of high-oil emulsions after spray drying.

Main Methods:

  • Preparation of emulsions using sodium caseinate (Na Cas) and soy oil at varying oil/protein ratios (0.25-3.0).

Related Experiment Videos

  • Homogenization of emulsions at different pressures (10-50 MPa).
  • Spray-drying of emulsions to produce powders with 20-75% oil (w/w).
  • Analysis of oil droplet size, interfacial protein load, ME, redispersion, and powder structure.

    • Main Results:

    • Oil droplet size decreased with increasing homogenization pressure, independent of oil/protein ratio.
    • Interfacial protein load was highest at low oil/protein ratios.
    • Microencapsulation efficiency (ME) significantly decreased from 89.2% to 18.8% as the oil/protein ratio increased from 0.25 to 3.0.
    • Reconstituted powders showed larger particle sizes than original emulsions, especially at high oil/protein ratios (>1.0).

    Conclusions:

    • Homogenization pressure effectively reduces oil droplet size but does not influence microencapsulation efficiency.
    • High oil/protein ratios lead to reduced microencapsulation efficiency and potential destabilization during spray drying.
    • The oil/protein ratio is a critical factor determining the quality and stability of spray-dried emulsions.