Oxidative stability of flaxseed lipids during baking

  • Z. Y. Chen
  • W. M. N. Ratnayake
  • S. C. Cunnane
Article

Abstract

This study examined the stability of whole and ground flaxseed, either alone or as an ingredient in a muffin mix, by measuring oxygen consumption and changes in α-linolenic acid under various conditions. When ground flaxseed was heated at 178°C in a sealed tube, headspace oxygen decreased from 21 to 2% within 30 min, while that of whole flaxseed decreased only slightly up to 90 min at 178°C. Under the same conditions, the oxygen consumption of lipids extracted from an equivalent amount of flaxseed was between the whole flaxseed and the ground flaxseed. After heating to 178°C for 1.5 h, α-linolenic acid decreased from 55.1 to 51.3% in ground flaxseed, and to 51.7% in lipid extracts, but it remained unchanged in the whole flaxseed. Ground flaxseed with large (<20 mesh) or small (>35 mesh) particle size absorbed more oxygen than samples with medium particle size when heated at 122°C for 8 h. Long-term storage of whole or ground flaxseed or lipid extracts showed that all three preparations were stable at room temperature for 280 d with 12 h light/dark cycles. A muffin mix, containing 28.5 wt% flaxseed flour, consumed oxygen more rapidly than a control muffin without flaxseed flour at a baking temperature of 178°C for 2 h, but the α-linolenic acid remained unchanged in both muffin mixes. Polymers derived from triglyceride oxidation and newtrans isomers of α-linolenic acid were not detected under the present experimental conditions. Under typical baking conditions, there is minimal loss of α-linolenic acid from flaxseed, although the manner of incorporation of flaxseed in food products should be considered to minimize oxidation of α-linolenic acids.

Key Words

α-Linolenic acid flaxseed flaxseed muffin oxidation oxygen absorption 

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Copyright information

© American Oil Chemists’ Society 1994

Authors and Affiliations

  • Z. Y. Chen
    • 1
  • W. M. N. Ratnayake
    • 1
  • S. C. Cunnane
    • 2
  1. 1.Nutrition Research Division, Food Directorate, Health Protection BranchHealth CanadaOttawaCanada
  2. 2.Department of Nutritional Sciences, Faculty of MedicineUniversity of TorontoOntarioCanada
  3. 3.Department of BiochemistryThe Chinese University of Hong KongHong Kong

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