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KMID : 0665220070200020120
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Korean Journal of Food and Nutrition
2007 Volume.20 No. 2 p.120 ~ p.124
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Thermal Degradation Kinetics of Tocopherols during Heating without Oxygen
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Chung Hae-Young
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Abstract
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The thermal degradation kinetics of alpha-, gamma- and delta-tocopherols was studied during heating at 100, 150 200 and 250℃ for 5, 15, 30 and 60 min in the absence of oxygen. The tocopherols were separated by HPLC using a reversed phase -Bondapak C-column with two kinds of elution solvent system in a gradient mode. The kinetics for degradation of α-, - and δ-tocopherols was analyzed as a function of temperatures and times. The degradation of tocopherols was described by the first-order kinetics in the absence of oxygen. The rate of tocopherols degradation was dependent on heating temperatures. The degradation rate constants for -, and -tocopherols showed an increasing trend as the heating temperature increased. The magnitude order of the experimental activation energy was δ->->α-tocopherol.
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