Abstract
Objective: To assess the oxidative burden of a highly concentrated compound of n-3 PUFAs as compared to corn oil by measuring thiobarbituric acid–malondialdehyde complex (TBA–MDA) by HPLC. We also studied the influence on TBA–MDA of statins combined with n-3 PUFAs or corn oil.
Design: A prospective, randomised, double-blind, controlled study.
Setting: One hospital centre in Stavanger, Norway.
Subjects: A total of 300 subjects with an acute myocardial infarction (MI).
Interventions: Gelatine capsules, containing 850–882 mg EPA and DHA as concentrated ethylesters, or 1 g of corn oil, were ingested in a dose of two capsules twice a day for at least 1 y. Alpha-tocopherol (4 mg) was added to all capsules to protect the PUFAs against oxidation.
Results: After 1 y TBA–MDA increased modestly in the n-3 PUFA group (n=125), as compared to the corn oil group (n=130), P=0.027. Multiple linear regression analyses of fatty acids in serum total phospholipids (n=56) on TBA–MDA measured after 12 months intervention, showed no dependency. Performing best subsets regression, serum phospholipid concentration of arachidonic acid (20:4 n-6 PUFA) was identified as a predictor of TBA–MDA at 12 months follow-up, P=0.004.
We found no impact of statins on TBA–MDA.
Conclusion: TBA–MDA increased modestly after long-term intervention with n-3 PUFAs compared to corn oil post-MI, suggesting biological changes induced by n-3 PUFAs, rather than simply reflecting their concentration differences. The peroxidative potential of n-3 PUFAs was not modified by statin treatment.
Sponsorship: Pharmacia A/S and Pronova A/S, Norway.
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Acknowledgements
We are grateful for the financial support by Pharmacia A/S and Pronova A/S, Norway. We acknowledge the support of Ole Kristensen, MD at the Department of Clinical Chemistry, Central Hospital in Rogaland. Finally, thanks are due to the project nurse, Solfrid Moen, Hjertelaget Research Foundation, Norway, and the steering committee of the ‘OFAMI’-study: Dennis WT Nilsen, Knud Landmark, Leik Woie and Michael Abdelnoor.
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Grundt, H., Nilsen, D., Mansoor, M. et al. Increased lipid peroxidation during long-term intervention with high doses of n-3 fatty acids (PUFAs) following an acute myocardial infarction. Eur J Clin Nutr 57, 793–800 (2003). https://doi.org/10.1038/sj.ejcn.1601730
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DOI: https://doi.org/10.1038/sj.ejcn.1601730
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