Fatty acid composition of French infant formulas with emphasis on the content and detailed profile oftrans fatty acids |
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Authors: | Jean-Michel Chardigny Robert L Wolff Estelle Mager Corine C Bayard Jean-Louis Sébédio Lucy Martine W M N Ratnayake |
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Affiliation: | (1) ISTAB, Laboratoire de Lipochimie Alimentaire, Université Bordeaux, Talence, France;(2) Nutrition Research Division, Health Canada, Ottawa, Ontario, Canada;(3) Unité de Nutrition Lipidique, BV 1540, INRA, 17 rue Sully, 21034 Dijon Cedex, France |
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Abstract: | The aim of the present study was to identify and quantitatetrans isomers of C18 fatty acids in some French infant formulas. Twenty powdered infant formulas were purchased in pharmacies and
supermarkets in order to assess theirtrans mono- and poly-unsaturated fatty acids content. The fatty acid profiles were examined using methyl and isopropyl ester derivatives.
The combination of gas-liquid chromatography, high-performance liquid chromatography, and silver nitrate thin-layer chromatography
was needed to describe the detailed fatty acid compositions of the samples, includingtrans isomers of unsaturated C18 fatty acids. All the samples containedtrans isomers of C18∶1 acid (mean level 1.97±0.28% of total fatty acids), with vaccenic acid being generally the major isomer (15
out of 20 samples), thus indicating the origin from bovine milk. All the formulas also contained various isomers of linoleic
and α-linolenic acids, but at lower levels.Trans PUFA isomers are the same as those present in deodorized oils. In conclusion, all the infant formulas analyzed in this study
contained sometrans fatty acids, including isomers of essential fatty acids. This should be taken into account in the dietary intake of the newborn. |
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Keywords: | Distribution pattern essential fatty acids infant formulas trans fatty acids |
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