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Consumption of thermally-oxidized sunflower oil by chicks reduces α-tocopherol status and increases susceptibility of tissues to lipid oxidation

Published online by Cambridge University Press:  09 March 2007

P. J. A. Sheehy ,
P. A. Morrissey  and
A. Flynn
P. J. A. Sheehy
Affiliation:
Department of Nutrition, University College, Cork, Republic of Ireland
P. A. Morrissey
Affiliation:
Department of Nutrition, University College, Cork, Republic of Ireland
A. Flynn
Affiliation:
Department of Nutrition, University College, Cork, Republic of Ireland
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Abstract

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The effect of heated sunflower oil consumption on α-tocopherol status, fatty acid composition and oxidative stability of chicken tissues was investigated. Chicks were fed on diets containing (g/kg): fresh sunflower oil (FSO) 40, heated sunflower oil (HSO) 40 or heated sunflower oil (40) supplemented with α-tocopheryl acetate (HSE) to a similar α-tocopherol concentration as the FSO diet. Concentrations of α-tocopherol in tissues of chicks fed on HSO and HSE were significantly lower than those of chicks fed on FSO. Significant correlations were observed between plasma α-tocopherol concentration and the α-tocopherol concentrations of other tissues (r < 0·67, P < 0·005) and between log plasma α-tocopherol and plasma thiobarbituric acid-reacting substances (TBARS) concentrations (r – 0·851, P < 0·001). The concentrations of TEARS in tissues of chicks fed on the various diets were generally very similar before stimulation of peroxidation with Fe–ascorbate. Susceptibility of tissues to Fe–ascorbate-induced lipid peroxidation was increased by feeding HSO. Supplementation with α-tocopheryl acetate reduced susceptibility tc lipid oxidation to varying degrees, depending on the tissue. The results suggest that chronic ingesrion of oxidized lipids may compromise free-radical-scavenging activity in vivo by depleting α-tocopherol in the gastrointestinal tract, or possibly in plasma and other tissues.

Keywords

Heated oilsα-TocopherolLipid peroxidationChick
Type
Interactions between vitamins and lipid metabolism
Information
British Journal of Nutrition , Volume 71 , Issue 1 , January 1994 , pp. 53 - 65
Copyright
Copyright © The Nutrition Society 1994

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