title: Influence of formulation on the oxidative stability of water-in-oil emulsions.
abstract: The oxidation of water-in-oil (W/O) emulsions was investigated, emphasizing the impact of compositional parameters. The emulsions had approximately the same average droplet size and did not show any physical destabilization throughout the study. In the absence of pro-oxidant ions in the aqueous phase, lipid oxidation of the W/O emulsions was moderate at 60°C and was in the same range as that measured for the neat oils. Oxidation was significantly promoted by iron encapsulation in the aqueous phase, even at 25°C. However, iron chelation reduced the oxidation rate. Emulsions based on triglycerides rich in polyunsaturated fatty acids were more prone to oxidation, whether the aqueous phase encapsulated iron or not. The emulsions were stabilized by high- and low-molecular weight surfactants. Increased relative fractions of high molecular weight components reduced the oxidation rate when iron was present.
authors.affiliation: Laboratoire Matériaux, Traitement et Analyse, Institut National de Recherche et d'Analyse Physico-Chimique, Pôle Technologique de Sidi Thabet, 2020 Sidi Thabet, Tunisia; Univ. Bordeaux, CBMN, UMR 5248, 33600 Pessac, France; CNRS, CBMN, UMR 5248, 33600 Pessac, France; Bordeaux INP, CBMN, UMR 5248, 33600 Pessac, France; INSAT, Université de Carthage, Centre Urbain Nord, 1080 Tunis Cedex, Tunisia.
authors.forename: Wafa
authors.initials: W
authors.lastname: Dridi
authors.affiliation: Laboratoire Matériaux, Traitement et Analyse, Institut National de Recherche et d'Analyse Physico-Chimique, Pôle Technologique de Sidi Thabet, 2020 Sidi Thabet, Tunisia.
authors.forename: Wafa
authors.initials: W
authors.lastname: Essafi
authors.affiliation: INSAT, Université de Carthage, Centre Urbain Nord, 1080 Tunis Cedex, Tunisia.
authors.forename: Mohamed
authors.initials: M
authors.lastname: Gargouri
authors.affiliation: Univ. Bordeaux, CBMN, UMR 5248, 33600 Pessac, France; CNRS, CBMN, UMR 5248, 33600 Pessac, France; Bordeaux INP, CBMN, UMR 5248, 33600 Pessac, France.
authors.forename: Fernando
authors.initials: F
authors.lastname: Leal-Calderon
authors.affiliation: Univ. Bordeaux, CBMN, UMR 5248, 33600 Pessac, France; CNRS, CBMN, UMR 5248, 33600 Pessac, France; Bordeaux INP, CBMN, UMR 5248, 33600 Pessac, France. Electronic address: mcansell@enscbp.fr.
authors.forename: Maud
authors.initials: M
authors.lastname: Cansell
mesh_terms: D002614:Chelating Agents; D004655:Emulsions / Q000737:chemistry*; D005231:Fatty Acids, Unsaturated / Q000737:chemistry; D007501:Iron; D015227:Lipid Peroxidation; D010084:Oxidation-Reduction; D010938:Plant Oils / Q000737:chemistry*; D013501:Surface-Active Agents; D014867:Water
chemical_list: D002614:Chelating Agents; D004655:Emulsions; D005231:Fatty Acids, Unsaturated; D010938:Plant Oils; D013501:Surface-Active Agents; D014867:Water; D007501:Iron
keywords: Conjugated dienes; Emulsion formulation; Lipid oxidation; Water-in-oil emulsions