System and method for industrial encapsulation of thermolabile substances
A facility for industrial drying and/or encapsulation of thermolabile substances comprising at least one injection unit ( 1 ) wherein the thermolabile substance is introduced, an encapsulating material when the facility is used to encapsulate, a solvent, additives and an injection gas flow for obtaining droplets from the thermolabile substance. It further comprises a drying unit ( 2 ) through which the droplets and a drying gas are introduced for evaporating the solvent and comprises a collection unit ( 3 ) configured to separate the microcapsules generated from the drying gas and which is selected from a cartridge filter collector, a cyclone collector or a combination of the two. It also describes a method for the industrial encapsulation of thermolabile substances which is carried out at the proposed facility.
1. A method for the industrial encapsulation of thermolabile substances characterised in that it is carried out in a facility for industrial drying and/or encapsulation of thermolabile substances comprising at least:
one injection unit comprising at least:
one inlet for a solution;
one inlet for injection gas; and
one outlet for droplets through which sprayed droplets of solution are released,
one drying unit arranged after the injection unit and comprising at least:
one inlet for drying gas;
one inlet for droplets;
one longitudinal receptacle through which the droplets with the drying gas move until the solvent of the droplets evaporates, forming microcapsules; and
one outlet for microcapsules and drying gas through which the microcapsules and drying gas that drags the evaporated solvent with it are released from the receptacle;
one collection unit arranged after the drying unit, which is configured to separate the microcapsules generated from the drying gas;
wherein the method comprises the following stages:
a) preparing a polymer solution comprising:
a thermolabile substance to be encapsulated,
an encapsulating precursor;
an organic or aqueous solvent selected from ethanol, water and a combination thereof; and
b) forming droplets from a polymer solution obtained in stage (a) in the presence of an injection gas flow;
c) drying the droplets obtained in stage (b) in the drying unit at a controlled temperature to obtain microcapsules; and
d) collecting the microcapsules obtained in stage (c) by means of the collection unit; and wherein the stage b) of forming droplets is carried out by applying a voltage of between 0.1 kV and 500 kV to the solution and injection gas flow at the outlet of the injection unit.
2. The method of claim 1 , wherein the stage c) is carried out at ambient or sub-ambient temperature.
3. The method of claim 1 , wherein the encapsulating precursor of stage (a) is selected from animal, vegetable and microbial proteins.
4. The method of claim 3 , wherein the encapsulating precursor of stage (a) is selected from milk serum, caseins, natural polypeptides or obtained from the genetic modification of microorganisms, collagen, soy protein and zein.
5. The method of claim 1 , wherein the encapsulating precursor of stage (a) are oligosaccharides selected from lactose, sucrose, maltose and fructo-oligosaccharides.
6. The method of claim 1 wherein an additive is used in stage a).
7. The method of claim 6 , wherein the additive is a surfactant.
8. The method of claim 1 , wherein the stage b) of forming droplets is carried out by applying a voltage of between 5 kV and 15 kV to the solution and injection gas flow at the outlet of the injection unit.
9. The method of claim 1 , wherein the stage b) of forming droplets is carried out by applying a voltage in alternating current.