IMPROVEMENT OF OXIDATIVE STABILITY AND NUTRITIONAL VALUE OF HIGHLY UNSATURATED FATTY ACIDS BY ARRANGEMENT OF MOLECULAR STRUCTURES OF LIPIDS

由二十碳五烯酸和棕榈酸组成的三酰甘油的结构对自氧化形成的二十碳五烯酸衍生的单氢过氧化物的异构体组成没有任何影响。比较二十碳五烯酸的三、二和单酰甘油的氧化稳定性，三酰甘油比其他甘油更容易发生自氧化。从挥发性醛的产生判断，含二十碳五烯酸的三酰甘油的风味稳定性取决于三酰甘油分子中二十碳五烯酸的数量，即，在所有三酰基甘油中，二十碳五烯酰甘油产生最大量的挥发性醛。二十二碳六烯酸在淋巴液中以单酰基甘油形式存在的速率和回收率高于三酰基甘油、二酰基甘油或乙酯。当二十二碳六烯酸以1%的水平给予大鼠饮食1周时，三酰甘油型二十二碳六烯酸比单酰甘油和乙酯型二十二碳六烯酸更有效地降低血浆和肝脏三酰甘油。

The structures of triacylglycerols consisting of eicosapentaenoic acid and palmitic acid did not give any effect on the isomeric composition of monohydroperoxides derived from eicosapentaenoic acid formed by autoxidation Comparing the oxidative stabilities of tri-, di- and monoacylglycerols of eicosapentaenoic acid, triacylglycerol was more susceptible for autoxidation than others. Judging from the volatile aldehyde generation, the flavor stability of eicosapentaenoic acid-containing triacylglycerols was dependent on the number of eicosapentaenoic acid in a triacylglycerol molecule, i.e., trieicosapentaenoylglycerol gave the largest quantity of volatile aldehydes among all triacylglycerols. Rates and recoveries of docosahexaenoic acid given as monoacylglycerol in lymph was higher than those of triacylglycerol, diacylglycerol or ethyl esters. When docosahexaenoic acid was given to rats at a 1% level in the diet for 1 week, triacylglycerol type-docosahexaenoic acid reduced plasm and liver triacylglycerol more effectively than monoacylglycerol and ethyl ester-type docosahexaenoic acid.