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Dietary triacylglycerol structure and saturated fat alter plasma and tissue fatty acids in piglets

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Lipids

Abstract

Human and pig milk triacylglycerols contain a large proportion of palmitic acid (16:0) which is predominately esterified in the 2-position. Other dietary fats contain variable amounts of 16:0, with unsaturated fatty acids predominantly esterified in the 2-position. These studies determined if the amount or position of 16:0 in dietary fat influences the composition or distribution of liver, adipose tissue, lung, or plasma fatty acids in developing piglets. Piglets were fed to 18 d with sow milk or formula with saturated fat from medium-chain triglyceride (MCT), coconut or palm oil, or synthesized triacylglycerols (synthesized to specifically direct 16:0 to the 2-position) with, in total fatty acids, 30.7, 4.3, 6.5, 27.0, and 29.6% 16:0, and in 2-position fatty acids, 55.3, 0.4, 1.3, 4.4, and 69.9% 16:0, respectively. The percentage of 16:0 in the 2-position of adipose fat from piglets fed sow milk, palm oil, and synthesized triacylglycerols were similar and higher than in piglets fed MCT or coconut oil. Thus, the amount, not the position, of dietary 16:0 determines piglet adipose tissue 16:0 content. The effects of the diets on the plasma and liver triacylglycerols were similar, with significantly lower 16:0 in total and 2-position fatty acids of the MCT and coconut oil groups, and significantly higher 16:0 in the plasma and liver triacylglycerol 2-position of piglets fed the synthesized triacylglycerols rather than sow milk or palm oil. The lung phospholipid total and 2-position 16:0 was significantly lower in the MCT, coconut, and palm oil groups, but similar in the synthesized triacylglycerol group and sow milk group. The lung phospholipid total and 2-position percentage of arachidonic acid (20:4n-6) was significantly lower in all of the formula-fed piglets than in milk-fed piglets. The physiological significance of this is not known.

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Abbreviations

LPL:

lipoprotein lipase

MCT:

medium-chain triglyceride

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Authors and Affiliations

  1. Department of Paediatrics, University of British Columbia Research Institute for Child and Family Health, 950 West 28th Ave., V5Z 4H4, Vancouver, B.C., Canada

    Sheila M. Innis & Roger Dyer

  2. Unilever Research, Colworth Laboratory, Sharnbrook, UK

    Paul T. Quinlan

  3. Mead Johnson Research Center, Evansville, Indiana

    Deborah Diersen-Schade

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  1. Sheila M. Innis
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  2. Roger Dyer
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  3. Paul T. Quinlan
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  4. Deborah Diersen-Schade
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Innis, S.M., Dyer, R., Quinlan, P.T. et al. Dietary triacylglycerol structure and saturated fat alter plasma and tissue fatty acids in piglets. Lipids 31, 497–505 (1996). https://doi.org/10.1007/BF02522643

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  • DOI: https://doi.org/10.1007/BF02522643

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