title: Influence of ionic complexation on release rate profiles from multiple water-in-oil-in-water (W/O/W) emulsions.
abstract: Water-in-oil-in-water (W/O/W) double emulsions were prepared, and the kinetics of release of magnesium ions from the internal to the external water phase was followed. Different chelating agents (phosvitin and gluconate) were used to bind magnesium within the prospect of improving the ion retention in the internal aqueous droplets. Magnesium release was monitored for 1 month of storage, for each formulation, with and without chelation, at two storage temperatures (4 and 25 degrees C). Leakage occurred without film rupturing (coalescence) and was mainly due to entropically driven diffusion/permeation phenomena. The experimental results revealed a clear correlation between the effectiveness of chelating agents to delay the delivery and their binding capacity characterized by the equilibrium affinity constant. The kinetic data (percent released versus time curves) were interpreted within the framework of a kinetic model based on diffusion and taking into account magnesium chelation.
authors.affiliation: Université Bordeaux 1, TREFLE UMR CNRS 8508, ENSCBP, 16 avenue Pey Berland, 33607 Pessac, France.
authors.forename: Marie
authors.initials: M
authors.lastname: Bonnet
authors.forename: Maud
authors.initials: M
authors.lastname: Cansell
authors.forename: Frédéric
authors.initials: F
authors.lastname: Placin
authors.forename: Elisabeth
authors.initials: E
authors.lastname: David-Briand
authors.forename: Marc
authors.initials: M
authors.lastname: Anton
authors.forename: Fernando
authors.initials: F
authors.lastname: Leal-Calderon
mesh_terms: D002614:Chelating Agents / Q000737:chemistry; D004058:Diffusion; D004655:Emulsions / Q000737:chemistry*; D007477:Ions / Q000737:chemistry; D007700:Kinetics; D008274:Magnesium / Q000737:chemistry*; D009821:Oils / Q000737:chemistry*; D014867:Water / Q000737:chemistry*
chemical_list: D002614:Chelating Agents; D004655:Emulsions; D007477:Ions; D009821:Oils; D014867:Water; D008274:Magnesium