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The relationship of serum tocopherol and tocotrienol concentrations to the serum concentrations of lipids and lipoproteins in normocholesterolemic middle-aged men after consuming crude palm oil-rich diets
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Vitamin E consists of two homologous series, the tocopherols and tocotrienols. Each of the four homologues in both series was quantitated in serum samples from 29 normocholesterolemic men who consumed their habitual diets or diets modified so that half of the fat consumed was crude palm oil. Crude palm oil is a rich source of tocotrienols. Tocotrienols have been reported to decrease serum cholesterol, low-density lipoprotein cholesterol and apolipoprotein B concentrations in humans and other models. No tocotrienols were detected in the serum of the men. Alpha-tocopherol was the predominant form of vitamin E in the serum, and the mean serum gammatocopherol concentration was between 10% and 15% of the mean alpha-tocopherol concentration. Comparison of the serum concentrations of alpha-and gamma-tocopherol from each diet treatment showed that they were not significantly different despite the change of dietary vitamin E composition. Serum tocotrienol concentrations were determined to be a poor indicator of the effects of tocotrienols on serum cholesterol concentrations. Correlation coefficients were determined for habitual-diet serum tocopherol concentrations matched with serum lipid and lipoprotein fraction concentrations. Correlation coefficients were also determined for the crude palm oil diet concentrations. The corresponding correlation coefficients from each diet were not significantly different. It was concluded that the modified dietary fat and dietary vitamin E composition did not change the relationship between the serum vitamin E homologue concentrations and the serum lipid and lipoprotein fraction concentrations. Habitual diet serum tocopherol, lipid, and lipoprotein concentrations were subtracted from the corresponding crude palm oil diet concentrations. These values represented the change in serum concentrations. The changes in vitamin E homologue concentrations were matched with the changes in serum lipid and lipoprotein concentrations to determine if tocopherol concentrations and lipid or lipoprotein concentrations changed concomitantly. Serum alpha-tocopherol concentrations changed concomitantly with serum phospholipid concentrations.
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Includes bibliographical references: p. 63-69.
Issued also on microfiche from Lange Micrographics.
Peterson, Jeffery Scott (1996). The relationship of serum tocopherol and tocotrienol concentrations to the serum concentrations of lipids and lipoproteins in normocholesterolemic middle-aged men after consuming crude palm oil-rich diets. Master's thesis, Texas A&M University. Available electronically from
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