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СATALOGUE / PHARMACEUTICAL PRODUCTION TECHNOLOGIES / MICROENCAPSULATION OF MEDICINE / Spray drying method (physicochemical microencapsulation method)

Spray drying method (physicochemical microencapsulation method)

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СATALOGUE / PHARMACEUTICAL PRODUCTION TECHNOLOGIES / MICROENCAPSULATION OF MEDICINE / Spray drying method (physicochemical microencapsulation method)

Spray drying method (physicochemical microencapsulation method)

The method of spray drying of dispersion or emulsion of encapsulated substance containing polymer and solvent (both organic and aqueous) consists in dispersing them into a flow of heat transfer gas. As a result of heat and mass transfer, the solvent is removed from the system and dense particles are formed in which the encapsulated substance is distributed throughout the volume rather than concentrated in the capsule core. The most common groups of substances used for encapsulation by spray drying are carbohydrates, including modified and hydrolyzed starches, cellulose derivatives, gums, and cyclodextrins; proteins, including whey proteins, casein, and gelatin; and biopolymers. The type of encapsulation material used affects not only the encapsulation efficiency, but also the morphology of the product particles.

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  • Information updated : 09 / 07 / 2024
  • In stock
  • Manufacturer : 1 year for Spray drying method (physicochemical microencapsulation method)

Model: Spray drying method (physicochemical microencapsulation method)

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From the physicochemical point of view, the phenomenon of coacervation is caused by intra- and intermolecular interaction involving polyelectrolyte ions or polyelectrolytes, leading to a change in the conformation of polyelectrolyte macromolecules in solution, the degree of their hydration and, as a consequence, to a decrease in their solubility. Coacervation in the interaction of a polymer solution and a low molecular substance is called simple. It is based on the physicochemical mechanism of sticking, “raking into a pile” of dissolved molecules and separation of water from them with the help of water-removing agents. Simple coacervation is caused by adding inorganic salts or other lyophilic substances, as well as by changing the temperature or diluting the system. Complex coacervation is observed when two or more polymers, whose macromolecules carry opposite charges, interact and neutralize each other.

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Technical specifications

In addition, different materials have different drying rates and under the same encapsulation process conditions, products will have different residual moisture contents. All this affects product storage and tendency to agglomeration. The polymers used as encapsulation material were poly-ortho ester (ROE – poly(ortho ester)), a,1-so-polymer of lactic and glycolic acids (PLGA – poly(dl-lactide-co-glycolide)) and their blends with different percentages. It can be seen that when using ROE, particle agglomeration is minimal, while particles containing PLGA stick together after 6 h. When using polymer blends, the degree of particle agglomeration varies depending on the proportion of polymers: particles containing PLGA 80 % are less prone to agglomeration.

Additional information

However, it is noted that after 5 days, pores are formed on the surface of the particles, which subsequently increase in size and negatively affect the preservation of the encapsulated substance. Due to the relatively high economy and productivity of the process, food additives, flavorings, probio-tic, aromatic oils, antibiotics, enzymes and other substances are encapsulated by this method. Physicochemical methods utilize the phenomenon of coacervation. Coacervation (from the Latin word acervus, meaning accumulation or union) is the formation of droplets enriched with dissolved substance in a solution of high-molecular compounds. The merging of the formed droplets leads to the separation of the system into two equilibrium liquid layers: a layer with a low content of polyelectrolyte and a layer with an increased concentration of polyelectrolyte, called the coacervate layer.

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