Developing a Model of the Foam Emulsion System and Confirming the Role of the Yield Stress Shear of Interfacial Adsorption Layers to Provide Its Formation and Stability

The model of the formation of the foam emulsion by the emulsion whipping was developed. It was experimentally proved that the yield stress shear of interfacial adsorption layers can be used as a criterion for evaluating the stability of foams, emulsions and foam-emulsion systems. It was found that the introduction of DATEM to the reconstituted skimmed milk increases the yield stress shear of interfacial adsorption layers and stability of foams and emulsions. The introduction of lecithin's or DATEM reduces the yield stress shear of interfacial adsorption layers and stability of foams and emulsions accordingly. Simultaneous use of milk proteins, LACTEM, lecithin's and DATEM provides 1.3 times higher yield stress shear of interfacial adsorption layers at the water-air interface than at the water-oil interface, which is a thermodynamic condition for the formation of the foam emulsion by the emulsion whipping. It was proved that homogenization of the emulsion based on cocoa butter, milk proteins and surfactants provides destabilization of the emulsion and creates conditions for the flotation of destabilized fat particles.The results allow justifying the parameters of the technology of the whipped semi-finished product based on cocoa butter, which is the emulsion whipping of which provides the foaming capacity of 450±22 %, the mechanical strength of the foam emulsion of 3200±160 Pa. It was confirmed that the whipping process can be divided into three stages: foaming, emulsion destabilization and adhesion of fat particles to air bubbles, providing high mechanical strength of the foam emulsion

Development of a Theoretical Model for Obtaining the Whipped Emulsions From a Dry Fat-containing Mixture and Its Experimental Verification

We developed a theoretical model of the Pickering-steric stabilization of whipped emulsions structure with a low fat content, obtained from a dry fat-containing mixture. It was experimentally proven that the yield shear stress of a whipped emulsion is determined by the degree of destabilization of fatty particles. It is shown that in order to ensure the full degree of destabilization of fatty particles, it is necessary that 5.0...7.0 g of oil is introduced with 3.0 g of distilled monoglycerides and 0.08…0.1 g of soy lecithin. The destabilized fatty particles are capable of adhesion to air bubbles thus providing for the Pickering-stabilization of a whipped emulsion. It was established that at low content of oil in the system (5.0...7.0 %), it is necessary to combine the Pickering stabilization with the steric stabilization. Steric stabilization in a whipped emulsion is implemented the complex formation of sodium caseinate and kappa-carrageenan, increasing the yield shear stress of the interface adsorption layers.Whipped emulsions with a large foaming capacity and yield shear stress are obtained from a dry fat-containing mixture. For this purpose, it is necessary to provide, during crystallization of the fatty phase, a contact with white sugar. This approach ensures formation of the interface adsorption layers and partial wetting the fatty particles (an edge angle of wetting is 25.0±2.0°). The proposed approach is named the quasi-emulsification. Introduction to sunflower oil of 30…37.5 % of distilled monoglycerides of fatty acids provides the obtaining of dry loose fat mixtures. New technology that we propose for obtaining the dry mixtures is characterized by energy efficiency because of the absence of operation of drying the emulsion. Using the developed technology makes it possible to receive whipped emulsions with the foaming capacity that is 1.7…2.0 times higher than that of the products-analogues available in the Ukrainian market