Articles

Lipids

, Volume 31, Issue 2, pp 165-168

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

  • Jean-Michel ChardignyAffiliated withUnité de Nutrition Lipidique, INRA
  • , Jean-Louis SébédioAffiliated withUnité de Nutrition Lipidique, INRA
  • , André GrandgirardAffiliated withUnité de Nutrition Lipidique, INRA
  • , Lucy MartineAffiliated withUnité de Nutrition Lipidique, INRA
  • , Olivier BerdeauxAffiliated withUnité de Nutrition Lipidique, INRA
  • , Jean-Michel VatèleAffiliated withLaboratoire de Chimie Organique I, ESCIL

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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.