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Identification of noveltrans isomers of 20∶5n−3 in liver lipids of rats fed a heated oil

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Lipids

Abstract

Trans polyunsaturated n−3 fatty acids are formed as a result of the heat treatment of vegetable oils. It was demonstrated previously that the 18∶3 Δ9cis, 12cis, 15trans containing acis Δ9 ethylenic bond was converted to a geometrical isomer of 20∶5n−3, the 20∶5 Δ5cis, 8cis, 11cis, 14cis, 17trans. In the present study, we have identified two new isomers of eicosapentaenoic acid, the Δ11 monotrans and the Δ11, 17 ditrans isomers in liver of rats fed a heated oil. These are formed as a result of the conversion of two of the main isomers of linolenic acid which are present in refined and frying oils, the 18∶3 Δ9trans, 12cis, 15cis and the 18∶3 Δ9trans, 12cis, 15trans.

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Abbreviations

DMOX:

dimethyl oxazoline derivatives

ECL:

equivalent chain length

EPA:

eicosapentaenoic acid

FAME:

fatty acid methyl esters

FTIR:

Fourier transform infrared

GLC:

gas-liquid chromatography

PUFA:

polyunsaturated fatty acids

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Authors and Affiliations

  1. Unité de Nutrition Lipidique, INRA, 17 rue Sully, BV 1540, 21034, Dijon, France

    Jean-Michel Chardigny, Jean-Louis Sébédio, André Grandgirard, Lucy Martine & Olivier Berdeaux

  2. Laboratoire de Chimie Organique I, ESCIL, Villeurbanne, France

    Jean-Michel Vatèle

Authors
  1. Jean-Michel Chardigny
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  2. Jean-Louis Sébédio
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  3. André Grandgirard
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  4. Lucy Martine
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  5. Olivier Berdeaux
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  6. Jean-Michel Vatèle
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Chardigny, JM., Sébédio, JL., Grandgirard, A. et al. Identification of noveltrans isomers of 20∶5n−3 in liver lipids of rats fed a heated oil. Lipids 31, 165–168 (1996). https://doi.org/10.1007/BF02522616

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  • DOI: https://doi.org/10.1007/BF02522616

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