Journal
FOOD CHEMISTRY
Volume 129, Issue 3, Pages 854-859Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2011.05.034
Keywords
Free fatty acids; Oil-in-water emulsion; Lipid oxidation; Prooxidant; Emulsion droplet surface charge; Unsaturated fatty acids
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Free fatty acids are strong prooxidants in both bulk and emulsified oils. Addition of oleic acid to an oil-in-water emulsions increased lipid hydroperoxide and hexanal formation at free fatty acid concentrations as low as 0.1% of the lipid. The prooxidant effect of free fatty acids was dependent on fatty acid type with lipid oxidation rates being in the order of linolenic < linoleic < oleic. There were no significant differences in lipid oxidation rates when free fatty acid isomers with cis or trans double bonds were compared. The prooxidant activity of the free fatty acids was postulated to be due to their ability to attract prooxidant metals as well as co-oxidise the triacylglycerol in the oil. Overall, these results show that the oxidative stability of oil-in-water emulsions is strongly linked to both the concentration and type of free fatty acids present. (C) 2011 Elsevier Ltd. All rights reserved.
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