Determining antioxidant distributions in model food emulsions: Development of a new kinetic method based on the pseudophase model in micelles and opaque emulsions

Laurence Romsted, Jianbing Zhang

Research output: Contribution to journalArticle

6 Scopus citations


The mechanisms of lipid peroxidation and the distributions of antioxidants in emulsions are not fully understood, in a large part because conventional methods for monitoring reactant distributions in solutions of homogeneous surfactant aggregates cannot be used in opaque emulsions. Here we show that a kinetic method based on monitoring the rate of product formation by HPLC for reaction of an arenediazonium ion probe and the antioxidant TBHQ in aqueous micellar solutions of a non-ionic surfactant, C12E6, gives the same values for the distribution constant of TBHQ as more established spectral shift and kinetic methods. The HPLC method also works in octane/C12E 6/H2O emulsions. To our knowledge, this is the first application of a pseudophase model to a real biphasic system. Future work will focus on estimating distribution constants of a variety of antioxidants in emulsions and attempting to establish a scale of antioxidant efficiency from their rate constants in the surfactant film of the emulsions.

Original languageEnglish (US)
Pages (from-to)182-187
Number of pages6
JournalProgress in Colloid and Polymer Science
Publication statusPublished - Jul 13 2004


All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Polymers and Plastics
  • Colloid and Surface Chemistry
  • Materials Chemistry


  • Antioxidant distribution
  • Kinetics Pseudophase model
  • Non-ionic emulsions
  • Non-ionic micelles

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