TY - JOUR
T1 - Oxidation at elevated temperatures
T2 - Competition between α-tocopherol and unsaturated triacylglycerols
AU - Verleyen, Tom
AU - Kamal-Eldin, Afaf
AU - Mozuraityte, Revilija
AU - Verhé, Roland
AU - Dewettinck, Koen
AU - Huyghebaert, Andre
AU - De Greyt, Wim
PY - 2002/8/15
Y1 - 2002/8/15
N2 - The competitive oxidation between α-tocopherol and unsaturated fatty acyls at thermoxidation conditions (180 and 240°C) was evaluated using purified triacylglycerols from nine fats and oils (refined coconut, palm, tallow, olive, high oleic sunflower, sunflower, corn, soybean, and flaxseed oil). α-Tocopherol degraded faster in less unsaturated lipids and a linear correlation between the iodine value (x) and the residual tocopherol content (y) was obtained after 2 h of heating at 240°C (y = 3.72x + 137.5, R2 = 0.9463). The formation of polar oxidation products was established and the results were explained by a non-selective oxidation of unsaturated fatty acyls and α-tocopherol by highly reactive alkoxyl and hydroxyl radicals generated by decomposition of hydroperoxides.
AB - The competitive oxidation between α-tocopherol and unsaturated fatty acyls at thermoxidation conditions (180 and 240°C) was evaluated using purified triacylglycerols from nine fats and oils (refined coconut, palm, tallow, olive, high oleic sunflower, sunflower, corn, soybean, and flaxseed oil). α-Tocopherol degraded faster in less unsaturated lipids and a linear correlation between the iodine value (x) and the residual tocopherol content (y) was obtained after 2 h of heating at 240°C (y = 3.72x + 137.5, R2 = 0.9463). The formation of polar oxidation products was established and the results were explained by a non-selective oxidation of unsaturated fatty acyls and α-tocopherol by highly reactive alkoxyl and hydroxyl radicals generated by decomposition of hydroperoxides.
KW - Competitive oxidation
KW - Triacylglycerols
KW - α-Tocopherol
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U2 - 10.1002/1438-9312(200204)104:4<228::AID-EJLT228>3.0.CO;2-5
DO - 10.1002/1438-9312(200204)104:4<228::AID-EJLT228>3.0.CO;2-5
M3 - Article
AN - SCOPUS:0036011406
SN - 1438-7697
VL - 104
SP - 228
EP - 233
JO - European Journal of Lipid Science and Technology
JF - European Journal of Lipid Science and Technology
IS - 4
ER -