Coacervation dispersion, composition

The main advantage of coacervation by Polymer 2-Polymer 3 repulsion over polymer desolvation resides in the good control of the composition and viscosity of both the coacervate and dispersing phases. This, in turn, provides a means to control particle size and prevent undesired coalescence of the coacervate droplets. 

The microcapsules of aroma will imitate nature with a flhn, a skin, to be a barrier for the active aroma composition (core). The aroma core material will be finally dispersed homogenously (multicore) in the liquid or solid support material ( 20%-30% of total weight) if soluble in water as a solution if not soluble in water as an emulsion, or in a solid/past/powder. In some cases, a high core loading is obtained (90%) with specific techniques (coacervation, coating, and coextrusion). Or multicore capsules are prepared initially by emulsion, then transformed into powder by spraydrying, extrusion, etc. 

Since now the problems, which are connected with this changed solubility, (properties and internal structure of the colloid-rich phase, its composition as a function of the composition of the colloid-poor phase) are amenable to experimental study in A and B, but only with difficulty or not at all in C and D on account of the high dispersed state, the study of crystallisation and coacervation is precisely the right way to obtain further information about the mechanism which leads to reduced solubility in macromolecular colloids. 

Microencapsulation by coacervation is a common method for microcapsules production. It can be achieved by employing different methods, where the most common one is formation of an insoluble complex of two oppositely charged polymers and its subsequent deposition at surface of dispersed particles (e.g. emulsified oil droplets). In this way, microcapsules with coacervate shell are formed. Composition and microstructure of the coacervate shell are key to determine properties and application of microcapsules. 

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