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Dairy products as main dietary sources of trans-palmitoleic and trans-vaccenic acid in France

Abstract : Trans-palmitoleic acid (trans-C16:1 n-7, TPA) and trans-vaccenic acid (trans-C18:1 n-7, TVA) are usually found in dairy products: both are associated with improvements regarding risk of metabolic syndrome. However, partially hydrogenated oils (PHOs) were reported to contain TVA as well, while their TPA content was never assessed. Because there is no official ban on PHOs in Europe, the relative contribution of dairy products to trans fatty acids intake is not accurately known. The study aimed at assessing the most reliable sources of both TPA and TVA at the current time in France. Two hypotheses were made: (1) TPA and TVA are found in dairy products, (2) partially hydrogenated oils are not used anymore, and (3) current blends of vegetable oils are free of trans fatty acids. Foods were purchased in local stores in France. Trans fatty acids were isolated by silver-ion thin-layer chromatography and analyzed by gas chromatography-mass spectroscopy with appropriate conditions, to separate as much positional isomers (trans-C16:1 and trans-C18:1) as possible. Both TPA and TVA were found in dairy products, and in foods which fatty acid composition relied on both dairy lipids and vegetable oils. Conversely, blends of vegetable oils were free of TPA and TVA. Sources of both TPA and TVA are on the side of dairy products. In strong connection with dairy technology and farm management, the impact of processes and ruminant nutrition on TPA and TVA content in dairy fat should be understood.
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Contributor : Etienne Guillocheau Connect in order to contact the contributor
Submitted on : Tuesday, July 9, 2019 - 2:39:05 PM
Last modification on : Wednesday, April 6, 2022 - 4:08:21 PM



Étienne Guillocheau, Clémence Penhoat, Ambre Godet, Daniel D. Catheline, Philippe P. Legrand, et al.. Dairy products as main dietary sources of trans-palmitoleic and trans-vaccenic acid in France. IDF-FIL-World Dairy Summit 2018, Oct 2018, Daejeon, South Korea. 2018, ⟨10.13140/RG.2.2.15586.17607⟩. ⟨hal-02177980⟩



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