Abstract
Fourteen healthy male volunteers were given two separate high-saturated-fat meals with and without the addition of 4 g highly purified ethyl esters of either eicosapentaenoic acid (EPA) (95% pure, n=7) or docosahexaenoic acid (DHA) (90% pure, n=7) supplied as 1-g capsules each containing 3.4 mg vitamin F. The chylomicrons were isolated 6 h after the meals, at peak concentrations of n−3 fatty acids (FA). Addition of n−3 FA with the meal caused a 10.4-fold increase in the concentration of n−3 FA in chylomicrons compared to the saturated fat meal without addition of n−3 FA. After the saturated-fat meal, the concentration of thiobarbituric acid-reactive substances (TBARS) was 327.6±34.6 nmol/mmol triacylglycerol (TAG), which increased to 1015.8±212.0 nmol/mmol TAG (P<0.0001, n=14) after EPA and DHA were added to the meal. There was no significant correlation between the concentrations of TBARS and vitamin E in the chylomicrons collected 6 h after the test meal. The present findings demonstrate an immediate increase in chylomicron peroxidation ex vivo provided by intake of highly purified n−3 FA. The capsular content of vitamin E was absorbed into chylomicrons, but the amount of vitamin E was apparently not sufficient to protect chylomicrons against lipid peroxidation ex vivo. Daily intake of 4 g n−3 FA either as EPA or DHA for 5 wk did not change the plasma concentration of TBARS. Although not significantly different between groups, DHA supplementation decreased total glutathione in plasma (P<0.05) and EPA supplementation increased plasma concentration of vitamin E (P<0.05). The other lipid-soluble and polar antioxidants in plasma remained unchanged during 5 wk of intervention with highly purified n−3 FA.
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Abbreviations
- AUC:
-
area under the curve
- CM:
-
chylomicrons
- DHA:
-
docosahexaenoic acid
- EPA:
-
cicosapentaenoic acid
- FA:
-
fatty acid(s)
- HPLC:
-
high-performance liquid chromatography
- LDL:
-
low density lipoprotein
- TAG:
-
uiacylglycerol
- TBA:
-
thiobarbituric acid
- TBARS:
-
TBA-reactive substance
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Hansen, JB., Berge, R.K., Nordøy, A. et al. Lipid peroxidation of isolated chylomicrons and oxidative status in plasma after intake of highly purified eicosapentaenoic or docosahexaenoic acids. Lipids 33, 1123–1129 (1998). https://doi.org/10.1007/s11745-998-0314-7
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DOI: https://doi.org/10.1007/s11745-998-0314-7