Abstract
Tocopherols are important lipid-phase antioxidants that are subject to heat degradation. Therefore, kinetic analyses for oxidative degradation of tocopherols as a function of temperatures and times were performed. Alpha-, gamma- and delta-tocopherols dissolved in glycerol were heated at 100～250℃ for 5～60 min. Oxidized tocopherols were analyzed by HPLC using a reversed phase μ-Bondapak C₁?-column with two kinds of elution solvent systems in a gradient mode. The degradation kinetics for tocopherols followed a first-order kinetic model. The rate of tocopherol degradation was dependent on heating temperatures. The degradation rate constants for γ- and δ-tocopherols were higher than those for α-tocopherol. The experimental activation energies of α-, γ- and δ-tocopherols were 2.51, 6.05 and 5.34 ㎉/mole, respectively. The experimental activation energies for the oxidative degradation of γ- and δ-tocopherols were higher than that of α-tocopherol.
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