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Ultra-stable self-foaming oils.

Bernard P Binks1, Ioannis Marinopoulos1

  • 1School of Mathematics and Physical Sciences, University of Hull, Hull HU6 7RX, UK.

Food Research International (Ottawa, Ont.)
|April 12, 2017
PubMed
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This study shows how to create stable oil foams using fat crystals without additives. Controlled cooling creates crystal dispersions that can be whipped into highly stable foams, with temperature triggering collapse.

Area of Science:

  • Food Science
  • Materials Science
  • Physical Chemistry

Background:

  • Traditional fat foams often rely on added emulsifiers for stability.
  • Understanding fat crystallization is key to developing novel food structures.

Purpose of the Study:

  • To investigate the intrinsic foaming properties of various fats without added agents.
  • To explore the role of fat crystal networks in foam formation and stability.

Main Methods:

  • Controlled temperature manipulation to form triglyceride crystal dispersions in oils.
  • Aeration of these dispersions to create whipped oil foams.
  • Analysis of foam properties including stability, drainage, and bubble behavior.
  • Temperature-responsive foam collapse studies.
Keywords:
CrystalsOil foamSaturated fatTemperature-responsiveWhipping

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Main Results:

  • Stable, non-draining foams were produced from coconut oil, shea butter, cocoa butter, and palm kernel stearin.
  • Foam stability is linked to the formation of solid fat crystals (up to 30% solid fat content) in a liquid matrix.
  • Foams exhibit temperature-responsive collapse upon warming to the crystal melting point.
  • A model system of tristearin crystals in tricaprylin validated the proposed mechanism.

Conclusions:

  • Fat crystallization provides an intrinsic mechanism for creating highly stable oil foams.
  • These temperature-responsive foams offer potential for controlled release applications.
  • The findings advance the understanding of fat structuring in food and materials science.