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Journal of the American Oil Chemists' Society

, Volume 92, Issue 4, pp 561–569 | Cite as

Oxidation Rates of Triacylglycerol and Ethyl Ester Fish Oils

  • Jenna C. Sullivan Ritter
  • Suzanne M. Budge
  • Fabiola Jovica
  • Anna-Jean M. Reid
Original Paper

Abstract

Fish oil is available primarily as triacylglycerols (TAG) or ethyl esters (EE). Anecdotal evidence suggests that TAG have superior bioavailability and oxidative stability compared to EE. In this work, peroxide value (PV) and p-anisidine value (AV) were used to monitor oxidation in commercially available TAG and EE fish oils incubated at temperatures from 5 to 60 °C. Pseudo first-order kinetics were assumed and rate constants were calculated for each temperature. At all temperatures, the rates of oxidation were higher for EE oils than TAG oils. For PV and AV measured in both oils, non-linear Arrhenius models were plotted, generating activation energies that ranged from 7 to 103 and 2 to 159 kJ/mol for PV and AV, respectively. Although TAG were more resistant to oxidation than EE, they had lower activation energies (E a) at ≤15 °C for reactions measured with PV and AV. The E a for EE was negative at temperatures ≥45 °C, indicating that reaction rate was influenced by factors in addition to temperature.

Keywords

Lipid oxidation Reaction rates Kinetics Arrhenius model Shelf life Activation energy 

Supplementary material

11746_2015_2612_MOESM1_ESM.docx (13 kb)
Supplementary material 1 (DOCX 13 kb)

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Copyright information

© AOCS 2015

Authors and Affiliations

  • Jenna C. Sullivan Ritter
    • 1
  • Suzanne M. Budge
    • 2
  • Fabiola Jovica
    • 1
  • Anna-Jean M. Reid
    • 1
    • 2
  1. 1.Ascenta HealthDartmouthCanada
  2. 2.Department of Process Engineering and Applied ScienceDalhousie UniversityHalifaxCanada

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