Effects of randomization of partially hydrogenated corn oil on fatty acid and cholesterol absorption,and tissue lipid levels in rats |
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Authors: | Tamiho Koga Takako Yamato Ikuo Ikeda Michihiro Sugano |
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Affiliation: | (1) Department of Food and Nutrition, Nakamura Gakuen University, Jonan-ku, 814-01 Fukuoka;(2) Laboratory of Nutrition Chemistry, Kyushu University School of Agriculture, Higashi-ku, 812-81 Fukuoka, Japan;(3) Laboratory of Food Science, Kyushu University School of Agriculture, Higashi-ku, 812-81 Fukuoka, Japan |
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Abstract: | Randomization of partially hydrogenated corn oil containing approximately 45% oftrans octadecenoic acid only slightly, but not significantly, increased the lymphatic fatty acid absorption in rats. No effect
of randomization was observed on cholesterol absorption. When rats were fed these fats at the 8.8% level (with 1.2% safflower
oil) for three weeks, the concentrations of serum cholesterol, and serum and liver phospholipid were significantly higher
in randomized fat than in control fat, which was composed of 9% high-oleic safflower oil and 1% palm oil. Liver cholesterol
tended to be higher in randomized fat. In contrast, nonrandomized fat was not hyperlipidemic compared to control fat. Although
the fatty acid composition of liver phospholipids suggested a possible interference oftrans fatty acid with the metabolism of linoleic acid to arachidonic acid, there was no effect of randomization. In the two hydrogenated
fat groups,trans octadecenoic acid was incorporated and distributed similarly in adipose tissue triacylglycerol. These observations indicated
that randomization of partially hydrogenated fat is not beneficial to various lipid parameters in rats. |
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