Abstract
The kinetic analyses for thermal products of alpha-, gamma- and delta-tocopherols during heating as functions of temperature and time were studied. Alpha-, gamma- and delta-tocopherols dissolved in glycerol were heated at 100～200℃ for 5～60 min. The thermal products were separated by hexane extraction and analyzed by HPLC using a reversed phase μ-Bondapak C₁?-column with two kinds of elution solvents in a gradient mode. The formation kinetics of thermal products of tocopherols followed a first-order kinetic model. The formation rate of thermal products of tocopherols was dependent on heating temperatures and heating times. The activation energy and enthalpy for the thermal products of γ-and δ-tocopherols were higher than those for α-tocopherol as in the case of the oxidative degradation kinetics of tocopherol. The magnitude order of the activation energy was γ-＞δ-＞α-tocopherol.
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