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KMID : 1160620070120030131
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Preventive Nutrition and Food Science
2007 Volume.12 No. 3 p.131 ~ p.134
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Formation Kinetic Study of Thermal Products of Tocopherols
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Chung Hae-Young
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Abstract
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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 100～200oC for 5～60 min. The thermal products were separated by hexane extraction and analyzed by HPLC using a reversed phase μ-Bondapak C18-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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KEYWORD
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tocopherols, thermal degradation products, kinetics
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