Effect of dextrose equivalent (DE) of maltodextrin present in continuous phase on flow along with dispersion properties of sunflower oil in water emulsions has been investigated. Both, rheological and disperse characteristics of the emulsions were greatly influenced by continuous phase viscosity and thus by the DE value of maltodextrin.. The smaller DE value the greater high shear viscosity and the smaller the droplet size. Irrespective of the amount and DE value of maltodextrin used was, all the emulsions showed a pseudoplastic behaviour

Surfactant mixtures are very often used in various cosmetic and pharmaceutical products because they commonly act in synergism and provide more favorable properties than a single surfactant. Simultaneously, the presence of polymers in mixtures of surfactants may lead to molecular interactions and thereby affecting product stability and activity. For these reasons, it is very important to determine the influence of surfactant interactions on micellization and mixed micellization, as well as polymer-surfactant mixed micelles interactions. In this study, the self-aggregation of nonionic surfactants, polysorbate 20 (Tween 20), polyoxyethylene octylphenyl ether (Triton X100) and polyoxyethylene-polyoxypropylene block copolymer (Pluronic F68), with an ionic surfactant, sodium dodecyl sulfate, was examined in aqueous solution at 40 °C using a conductometric titration method. It was found that the concentration region for mixed micelle formation depends on the characteristics of the nonionic surfactant and its concentration. The formation of mixed micelles of surfactants in the presence of a nonionic polymer, hydroxypropylmethyl cellulose, and their binding to the hydrophobic sites of the polymer were also investigated. An analysis of obtained results indicated to different kinds of interactions in the investigated systems, which are crucial for their application.

Many food, pharmaceutical, cosmetic and chemical products exist in the form of emulsions. A common problem with emulsions is their instability. One method of effective protection against coalescence of the particles is to raise the viscosity and lower surface tension by adding a polymer and low-molar-mass surfactant. Interaction between polymer and surfactant could change the adsorption layer around the oil droplets in emulsion which effects emulsion stability. In this paper, the influence of low-molar-mass anionic surfactant, sodium dodecylsulfate (SDS), on the properties of hydroxypropylmethyl cellulose (HPMC) stabilized emulsion, has been investigated. Changes of viscosity and rheological properties of emulsion caused by the HPMC-SDS interaction in continuous phase were measured and stability of emulsions was observed during two months of storage. Significant increase in viscosity and stability of the emulsions was found at SDS concentrations leading to HPMC-SDS interaction in the continuous phase. Stability of emulsions changed with time and was influenced by the HPMC-SDS interaction