Identification of noveltrans isomers of 20∶5n?3 in liver lipids of rats fed a heated oil |
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Authors: | Jean-Michel Chardigny Jean-Louis Sébédio André Grandgirard Lucy Martine Olivier Berdeaux Jean-Michel Vatèle |
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Affiliation: | (1) Unité de Nutrition Lipidique, INRA, 17 rue Sully, BV 1540, 21034 Dijon, France;(2) Laboratoire de Chimie Organique I, ESCIL, Villeurbanne, France |
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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. |
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