Method of fenbendazole encapsulation

FIELD: chemistry.

SUBSTANCE: invention relates to chemical-pharmaceutical industry and represents method of encapsulating medication by method of precipitation with non-solvent, characterised by the application of fenbendazole as medication, and sodiumcarboxymethylcellulose, precipitated from solution in isopropanol by addition of water as non-solvent at 25C, as envelope.

EFFECT: simplification and acceleration of the process of obtaining microcapsules, reduction of loss in the process of obtaining microcapsules.

3 ex

 

The invention relates to the field of encapsulation, and in particular the production of microcapsules of fenbendazol.

Previously known methods for producing microcapsules of drugs. Thus, in U.S. Pat. 2092155, IPC A61K 047/02, A61K 009/16, publ. 10.10.1997, the Russian Federation proposed a method for microencapsulation of drugs, based on the use of irradiation with ultraviolet rays.

The disadvantages of this method are the duration of the process and the use of ultraviolet radiation, which can influence the formation of microcapsules.

In Pat. 2091071, IPC A61K 35/10, Russian Federation, publ. 27.09.1997 method for obtaining the drug by dispersion in a ball mill to obtain microcapsules.

The disadvantage of this method is the use of a ball mill and the duration of the process.

In Pat. 2101010, IPC A61K 9/52, A61K 9/50, A61K 9/22, A61K 9/20, A61K 31/19, Russian Federation, publ. 10.01.1998 proposed chewable form of the drug with taste masking, having the properties of a controlled release drug product that contains microcapsules with a size of 100-800 microns in diameter and consists of pharmaceutical kernel crystalline ibuprofen and polymeric coating comprising a plasticizer, elastic enough to resist chewing. Polymer coating presented yet a copolymer based on methacrylic acid.

The drawbacks of the invention: use of a copolymer based on methacrylic acid, as these polymer coatings can cause cancer; complexity; the duration of the process.

In Pat. 2173140, IPC A61K 009/50, A61K 009/127, Russian Federation, publ. 10.09.2001 method for obtaining kremnijorganicheskih microcapsules using a rotary cavitation plants with high shear effort and powerful acoustic phenomena of sound and ultrasound range for dispersion.

The disadvantage of this method is the use of special equipment - rotary-cavity setup, which has the ultrasonic action that affects the formation of microcapsules and can cause adverse reactions due to the fact that ultrasound destructive effect on the polymers of protein nature, therefore the proposed method is applicable when working with polymers of synthetic origin.

In Pat. 2359662, IPC A61K 009/56, A61J 003/07, B01J 013/02, A23L 001/00, publ. 27.06.2009, the Russian Federation proposed a method of producing microcapsules using spray cooling in the spray tower Niro under the following conditions: air temperature at the inlet 10C, the temperature at the outlet 28C, the speed of rotation of the spray drum 10000 rpm Microcaps the s according to the invention have improved stability and provide adjustable and/or prolonged release of the active ingredient.

Disadvantages of the proposed method are the duration of the process and the use of special equipment, a set of conditions (temperature of inlet air 10C, the temperature at the outlet 28C, the speed of rotation of the spray drum 10,000 rpm).

The closest method is the method proposed in U.S. Pat. 2134967, IPC A01N 53/00, A01N 25/28, publ. 27.08.1999,, Russian Federation (1999). Water is dispersed solution of a mixture of natural lipids and a PYRETHROID insecticide in the weight ratio of 2-4:1 in an organic solvent, which leads to simplification of the method of microencapsulation.

The disadvantage of this method is the dispersion in the aquatic environment, which makes the proposed method applicable to the production of microcapsules of water-soluble drugs in water-soluble polymers.

The technical objective is the simplification and acceleration of the process of production of microcapsules, the reduction of losses upon receipt of the microcapsules (increase in mass).

The solution of the technical problem is achieved by the method of encapsulation of fenbendazol, characterized in that as the shell of the microcapsules used sodium carboxymethylcellulose when receiving physical-chemical method for the deposition nerastvorim using isopropanol as a precipitator, the process of obtaining is performed without special equipment.

otlichitelnoj feature of the proposed method is the use of sodium carboxymethylcellulose as the shell of the microcapsules of fenbendazol - as their cores, and the use of isopropanol as a precipitator.

The result of the proposed method is to obtain microcapsules of fenbendazol in the sodium carboxymethyl cellulose at 25C for 20 minutes. The output of the microcapsules is over 90%.

EXAMPLE 1

Obtaining microcapsules of fenbendazol with the dissolution of the drug in dioxane, the ratio of the core/polymer 1:3

100 mg of fenbendazol dissolved in 1 ml of dioxane and the resulting mixture was dispersed in a solution of sodium carboxymethyl cellulose in isopropanol containing specified 300 mg of the polymer in the presence of 0.01 g of the drug Is under stirring 1000 R/C. Then poured 1 ml of distilled water. The resulting suspension is filtered and dried at room temperature.

Received 0,356 g white to yellowish powder. The yield was 89%.

EXAMPLE 2

Obtaining microcapsules of fenbendazol with the dissolution of the drug in dimethyl sulfoxide (DMSO), the ratio of the core/polymer 1:3

100 mg of fenbendazol dissolved in 1 ml DMSO and the mixture was dispersed in a solution of sodium carboxymethyl cellulose in isopropanol containing specified 300 mg of the polymer in the presence of 0.01 g of the drug Is under stirring 1000 R/C. Then poured 1 ml of distilled water. The resulting suspension is filtered and dried at room temperature.

Received 0,356 g be the CSOs with yellowish powder. The yield was 89%.

EXAMPLE 3

Obtaining microcapsules of fenbendazol with the dissolution of the drug in dimethylformamide (DMF), the ratio of the core/polymer 1:3

100 mg of fenbendazol dissolved in 1 ml DMF and the resulting mixture was dispersed in a solution of sodium carboxymethyl cellulose in isopropanol containing specified 300 mg of the polymer in the presence of 0.01 g of the drug Is under stirring 1000 R/C. Then poured 1 ml of distilled water. The resulting suspension is filtered and dried at room temperature.

Received 0,356 g white to yellowish powder. The yield was 89%.

The obtained microcapsules of fenbendazol physico-chemical method for the deposition nerastvorim using isopropanol as a precipitator, which increases output and accelerates the process of microencapsulation. The process is simple to perform and lasts for 20 minutes, requires no special equipment.

The proposed method is suitable for the veterinary industry due to the minimal loss of speed, ease of acquisition and allocation of microcapsules.

The method of encapsulation of a medicinal product by precipitation with aristotelem, characterized in that the medicinal product is used fenbendazol, as the shell - sodium carboxymethylcellulose, which precipitated out of the solution from ropanol by adding as nerastvorim water at 25C.



 

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