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American Journal of Clinical Nutrition, Vol 58, 525-532, Copyright © 1993 by The American Society for Clinical Nutrition, Inc

ORIGINAL RESEARCH COMMUNICATIONS

Antioxidant vitamins and low-density-lipoprotein oxidation

M Abbey, PJ Nestel and PA Baghurst
CSIRO, Division of Human Nutrition, Adelaide, South Australia.

Low-density-lipoprotein (LDL) oxidation was examined in 22 subjects (10 men, 12 women) after a daily dose of 18 mg beta-carotene, 900 mg vitamin C, and 200 mg alpha-tocopherol for 6 mo. Control subjects (12 men, 11 women) took no vitamin supplements. After 3-mo supplementation plasma concentrations of beta-carotene, alpha-tocopherol, and ascorbic acid increased fivefold (P < 0.001), 55% (P < 0.01), and 27% (P < 0.05), respectively. There was no difference from baseline in rate of oxidation or total amount of conjugated diene produced between subjects taking or not taking vitamins. Malondialdehyde in LDL before and after oxidation was not different between the two groups. Lag time before the onset of oxidation was significantly lengthened after antioxidant supplementation (28% and 35% after 3 and 6 mo, respectively, P < 0.001). There was a significant independent correlation between percent change in lag time and percent change in plasma alpha-tocopherol (r = 0.47, P < 0.01).


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