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Effects of heating process of soybean oil and seeds on fatty acid biohydrogenation in vitro

Troegeler-Meynadier, Annabelle and Puaut, Stéphanie and Farizon, Yves and Enjalbert, Francis Effects of heating process of soybean oil and seeds on fatty acid biohydrogenation in vitro. (2014) Journal of Dairy Science, 97 (9). 5657-5667. ISSN 0022-0302

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Official URL: http://dx.doi.org/10.3168/jds.2013-7783

Abstract

Heating fat is an efficient way to alter ruminal biohydrogenation (BH), and so milk fat quality. Nevertheless results are variable among studies and this could be due to various heating conditions differently affecting BH. The objectives of this study were to determine the effect of type and duration of heating of soybean oil or seeds on BH in vitro. Ruminal content cultures were incubated to firstly investigate the effects of roasting duration (no heating, 0.5 and 6 h) at 125°C and its interaction with fat source (soybean seeds vs. soybean oil), focusing on linoleic acid BH and its intermediates: conjugated linoleic acid (CLA) and trans-C18:1. Additionally, using a nested design, we compared the effects of seeds extrusion to the six combinations of unheated and roasted oils and seeds. None of the treatment was efficient to protect linoleic acid from BH. Soybean oil resulted in higer trans-11 isomers production than seeds: 5.7 and 1.2 for cis-9,trans-11-CLA and trans-11-C18:1, respectively. A 125°C 0.5 h roasting increased trans-11 isomers production by 11% compared to unheated and 6 h roasted fat. Extrusion of seeds was more efficient to increase trans-11-C18:1 production than seeds roasting, leading to values similar to oils. For other fatty acids, including cis-9,trans-11-CLA, extrusion resulted in similar balances than seeds, mainly 0.5 h roasted seeds. Extruded oilseeds would be more efficient than roasted seeds to produce trans-11-C18:1, nevertheless effects of conditions of extrusion need to be explored.

Item Type:Article
Additional Information:Thanks to American Dairy Science Association editor. The definitive version is available at http://www.sciencedirect.com The original PDF of the article can be found at Journal of Dairy Science website : http://www.sciencedirect.com/science/journal/00220302
Audience (journal):International peer-reviewed journal
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Institution:Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
French research institutions > Institut National de la Recherche Agronomique - INRA (FRANCE)
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Deposited On:22 Jan 2015 14:31

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