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American Journal of Clinical Nutrition, Vol 57, 391-398, Copyright © 1993 by The American Society for Clinical Nutrition, Inc
ORIGINAL RESEARCH COMMUNICATIONS |
M Abbey, GB Belling, M Noakes, F Hirata and PJ Nestel
Commonwealth Scientific and Industrial Research Organisation (CSIRO), Division of Human Nutrition, Adelaide, Australia.
Low-density lipoprotein (LDL) oxidation was measured in vitro to determine intraindividual variability and to relate oxidation to linoleic acid enrichment. Intraindividual variability was determined for eight subjects on 3 consecutive days after 14 d on a fixed diet. Coefficients of variation were 7.49 +/- 1.50%, 6.58 +/- 1.16%, and 4.58 +/- 0.77% for oxidation rate, lag time, and diene concentration, respectively. In the second study 12 normolipidemic men consumed a daily diet supplement containing 35 g linoleate-rich oil in one period and 35 g oleate-rich oil in the other period (2 x 3 wk crossover). LDL oxidized faster after the linoleate diet than after the oleate diet (mean +/- SE: 16.42 +/- 0.85 and 13.16 +/- 0.68 nmol diene.mg LDL protein-1.min-1, respectively, P < 0.02) and produced more conjugated diene (416 +/- 12.60 and 379.29 +/- 11.06 nmol/mg protein, respectively, P < 0.05) in proportion to the increase in LDL linoleate (r = 0.698, P < 0.001 and r = 0.618, P < 0.01 for rate and diene concentration, respectively). Lag time before onset of oxidation was not significantly altered by the linoleate-rich diet.
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