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Temperature and duration of heating of sunflower oil affect ruminal biohydrogenation of linoleic acid in vitro

Privé , Florence and Combes, Sylvie and Cauquil, Laurent and Farizon, Yves and Enjalbert, Francis and Troegeler-Meynadier, Annabelle Temperature and duration of heating of sunflower oil affect ruminal biohydrogenation of linoleic acid in vitro. (2010) Journal of Dairy Science, vol. 93 (n° 2). pp. 711-722. ISSN 0022-0302

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Official URL: http://dx.doi.org/10.3168/jds.2009-2534

Abstract

Sunflower oil heated at 110 or 150°C for 1, 3, or 6 h was incubated with ruminal content in order to investigate the effects of temperature and duration of heating of oil on the ruminal biohydrogenation of linoleic acid in vitro. When increased, these 2 parameters acted together to decrease the disappearance of linoleic acid in the media by inhibiting the isomerization of linoleic acid, which led to a decrease in conjugated linoleic acids and trans-C18:1 production. Nevertheless, trans-10 isomer production increased with heating temperature, suggesting an activation of Δ9-isomerization, whereas trans-11 isomer production decreased, traducing an inhibition of Δ12-isomerization. The amount of peroxides generated during heating was correlated with the proportions of biohydrogenation intermediates so that they might explain, at least in part, the observed effects. The effects of heating temperature and duration on ruminal bacteria community was assessed using capillary electrophoresis single-strand conformation polymorphism. Ruminal bacterial population significantly differed according to heating temperature, but was not affected by heating duration. Heating of fat affected ruminal biohydrogenation, at least in part because of oxidative products generated during heating, by altering enzymatic reactions and bacterial population.

Item Type:Article
Additional Information:Thanks to Elsevier Editor. The original PDF of the article is available 1 year after publication on http://download.journals.elsevierhealth.com/pdfs/journals/0022-0302/PIIS0022030210715137.pdf
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution: Université de Toulouse > Ecole Nationale Vétérinaire de Toulouse - ENVT
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
French research institutions > Institut National de la Recherche Agronomique - INRA
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Deposited By: Annabelle Troegeler
Deposited On:23 Nov 2010 15:31

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