KMID : 0665220070200020120
|
|
Korean Journal of Food and Nutrition 2007 Volume.20 No. 2 p.120 ~ p.124
|
|
Thermal Degradation Kinetics of Tocopherols during Heating without Oxygen
|
|
Chung Hae-Young
|
|
Abstract
|
|
|
The thermal degradation kinetics of alpha-, gamma- and delta-tocopherols was studied during heating at 100, 150 200 and 250¡É 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 ¥á-, - and ¥ä-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 ¥ä->->¥á-tocopherol.
|
|
KEYWORD
|
|
|
|
FullTexts / Linksout information
|
|
|
|
Listed journal information
|
|
|