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Molecules 2018, 23(1), 206; https://doi.org/10.3390/molecules23010206

Contribution of the Ratio of Tocopherol Homologs to the Oxidative Stability of Commercial Vegetable Oils

1
Department of Physiological Chemistry, Faculty of Chemistry, University of Vienna, 1090 Vienna, Austria
2
Department of Human Nutrition and Health, DSM Nutritional Products Ltd., 4303 Kaiseraugst, Switzerland
These authors contributed equally to this work.
*
Author to whom correspondence should be addressed.
Received: 19 November 2017 / Revised: 13 January 2018 / Accepted: 15 January 2018 / Published: 19 January 2018
(This article belongs to the Section Analytical Chemistry)
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Abstract

The antioxidant activity of tocopherols in vegetable oils was shown to chiefly depend on the amount and the tocopherol homolog present. However, the most effective ratio of tocopherol homologs with regard to the antioxidant capacity has not been elucidated so far. The present study analyzed the effect of different tocopherol concentrations, homologs and ratios of homologs on markers of lipid oxidation in the most commonly consumed vegetable oils (canola, sunflower, soybean oil) stored in a 12 h light/dark cycle at 22 ± 2 °C for 56 days under retail/household conditions. After 56 days of storage, the α-tocopherol-rich canola and sunflower oil showed the strongest rise in lipid peroxides, yielding 25.1 ± 0.03 meq O2/kg (+25.3-fold) and 24.7 ± 0.05 meq O2/kg (+25.0-fold), respectively. ESR experiments, excluding effects of the oils’ matrices and other minor constituents, confirmed that a food representative tocopherol ratio of (γ + δ)/α = 4.77, as represented in soybean oil, led to a more pronounced delay of lipid oxidation than a lower ratio in canola (1.39) and sunflower oil (0.06). An optimum (γ + δ)/α -tocopherol ratio contributing to the oxidative quality of vegetable oils extending their shelf life has to be investigated. View Full-Text
Keywords: vegetable oils; oxidative stability; lipid oxidation; hexanal; tocopherol ratio vegetable oils; oxidative stability; lipid oxidation; hexanal; tocopherol ratio
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Zaunschirm, M.; Pignitter, M.; Kienesberger, J.; Hernler, N.; Riegger, C.; Eggersdorfer, M.; Somoza, V. Contribution of the Ratio of Tocopherol Homologs to the Oxidative Stability of Commercial Vegetable Oils. Molecules 2018, 23, 206.

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