Release of electrolytes from double W/O/W emulsions stabilized by biopolymers

Seddari, Soumia; Moulai-mostefa, N.

Journal of Materials, Processes and Environment
Volume 4, Numéro 2, Pages 43-47
2016-12-04

Release Of Electrolytes From Double W/o/w Emulsions Stabilized By Biopolymers

Authors : Seddari Soumia . Moulai-mostefa N. .

Abstract

Water-in-oil-in-water (W/O/W) double emulsions were prepared by xanthan gum (XG) in presence of sodium caseinate (SC) using a two-step emulsification process and the kinetics of release of NaCl ions from the internal to the external water phase was investigated. It was noticed that release rate of the electrolyte encapsulated in the internal aqueous phase of the double emulsion stabilized by SC-XG at natural pH depends strongly on the protein concentration; however the effect of XG concentration was found less important. Adjustment of pH of emulsion near the isoelectric point of the protein improved the kinetics release of NaCl. Interfacial film at pH 5 is rigid than that at natural pH which explains the decrease of the release rates at pH 5. Microscopic analysis of formulated emulsions, after formulation and after one month at room temperature, showed that the release of the encapsulated electrolyte in the internal aqueous phase is made by diffusion through the lipid membrane.