Effect of triacylglycerol structure on absorption and metabolism of isotope-labeled palmitic and linoleic acids by humans |
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Authors: | E.?A.?Emken author-information" > author-information__contact u-icon-before" > mailto:eaemken@npoint.net" title=" eaemken@npoint.net" itemprop=" email" data-track=" click" data-track-action=" Email author" data-track-label=" " >Email author,R.?O.?Adlof,S.?M.?Duval,J.?M.?Shane,P.?M.?Walker,C.?Becker |
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Affiliation: | (1) ARS, NCAUR, USDA, 61604 Peoria, Illinois;(2) Illinois State University, 61790 Normal, Illinois;(3) Pelikan Technologies, Inc., 94303 Palo Alto, California;(4) Midwest Research Consultants, 11422 Princeville-Jubilee Rd., 61559 Princeville, IL |
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Abstract: | The effect of dietary TAG structure and fatty acid acyl TAG position on palmitic and linoleic acid metabolism was investigated in four middle-aged male subjects. The study design consisted of feeding diets containing 61 g/d of native lard (NL) or randomized lard (RL) for 28 d. Subjects then received an oral dose of either 1,3-tetradeuteriopalmitoyl-2-dideuteriolinoleoyl-rac-glycerol or a mixture of 1,3-dideuteriolinoleoyl-2-tetradeuteriopalmitoyl-rac-glycerol and 1,3-hexadeuteriopalmitoyl-2-tetradeuteriolinoleoyl-rac-glycerol. Methyl esters of plasma lipids isolated from blood samples drawn over a 2-d period were analyzed by GC-MS. Results showed that absorption of the 2H-fatty acids (2H-FA) was not influenced by TAG position. The 2H-FA at the 2-acyl TAG position were 85±4.6% retained after absorption. Substantial migration of 2H-16∶0 (31.2±8.6%) from the sn-2 TAG position to the sn-1,3 position and 2H-18∶2n−6 (52.8±6.4%) from the sn-1,3 position to the sn-2 position of chylomicron TAG occurred after initial absorption and indicates the presence of a previously unrecognized isomerization mechanism. Incorporation and turnover of the 2H-FA in chylomicron TAG, plasma TAG, and plasma cholesterol esters were not influenced by TAG acyl position. Accretion of 2H-16∶0 from the sn-2 TAG position in 1-acylphosphatidylcholine was 1.7 times higher than 2H-16∶0 from the sn-1,3 TAG positions. Acyl TAG position did not influence 2H-18∶2n−6 incorporation in PC. The concentration of 2H-18∶2n−6-derived 2H-20∶4n−6 in plasma PC from subjects fed, the RL diet was 1.5 times higher than for subjects fed the NL diet, and this result suggests that diets containing 16∶0 located at the sn-2 TAG position may inhibit 20∶4n−6 synthesis. The overall conclusion is that selective rearrangement of chylomicron TAG structures diminishes but does not totally eliminate the metabolic and physiological effects of dietary TAG structure. |
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