title: Impact of tween 20 hydroperoxides and iron on the oxidation of methyl linoleate and salmon oil dispersions.
abstract: To determine the role of surfactant hydroperoxides on the oxidative stability of fatty acids, the oxidation of methyl linoleate micelles and salmon oil-in-water emulsions was measured as a function of varying Tween 20 hydroperoxide concentrations. Increasing Tween 20 hydroperoxide concentrations from 3.5 to 14.7 micromol hydroperoxide/g Tween 20 decreased the lag phase of headspace hexanal formation but did not increase the total amount of hexanal formed in methyl linoleate/Tween 20 micelles. In the micelle system, Fe(2+) decreased the lag phase of hexanal formation but increased total hexanal concentrations only in micelles with the highest Tween 20 hydroperoxide concentrations (14.7 micromol hydroperoxide/g surfactant). Increasing Tween 20 surfactant hydroperoxide concentrations also increased the oxidation of salmon oil-in-water emulsions as determined by lipid hydroperoxides and headspace propanal. In both the micelle and emulsion systems, the prooxidant effect of Fe(2+) decreased with increasing Tween 20 hydroperoxide concentrations. These data show that surfactant hydroperoxides such as those in Tween 20 could decrease the oxidative stability of lipids in food emulsions.
authors.affiliation: Department of Food Science, University of Massachusetts, Amherst, Massachusetts 01003, USA.
authors.forename: C D
authors.initials: CD
authors.lastname: Nuchi
authors.forename: D J
authors.initials: DJ
authors.lastname: McClements
authors.forename: E A
authors.initials: EA
authors.lastname: Decker
mesh_terms: D004347:Drug Interactions; D004655:Emulsions; D005395:Fish Oils / Q000737:chemistry*; D006861:Hydrogen Peroxide / Q000737:chemistry / Q000494:pharmacology*; D007501:Iron / Q000494:pharmacology*; D008041:Linoleic Acids / Q000737:chemistry*; D010084:Oxidation-Reduction; D011136:Polysorbates / Q000737:chemistry / Q000494:pharmacology*; D013501:Surface-Active Agents / Q000737:chemistry / Q000494:pharmacology*
chemical_list: D004655:Emulsions; D005395:Fish Oils; D008041:Linoleic Acids; D011136:Polysorbates; D013501:Surface-Active Agents; C005575:methyl linoleate; C030341:salmon oil; D006861:Hydrogen Peroxide; D007501:Iron