Method of fenbendazole encapsulation

FIELD: chemistry.

SUBSTANCE: fenbendazole is used as medication, and sodium carboxymethylcellulose, precipitated from solution in heptanes by addition as non-solvent of butanol and water at 25°C, is used as envelope.

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

3 ex

 

The invention relates to the field of encapsulation, and in particular to a method for producing microcapsules of fenbendazol.

Previously known methods for producing microcapsules of drugs. Thus, in U.S. Pat. 2092155, IPC A61K 047/02, A61K 009/16 published 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, published 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, published 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. P the polymer coating is 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, published 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-quotational installation, which has 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 published 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 10°C, the temperature at the outlet 28°C, the speed of rotation of the spray drum 10000 rpm. who/min Microcapsules 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 10°C, the temperature at the outlet 28°C, the speed of rotation of the spray drum 10000 rpm).

The closest method is the method proposed in U.S. Pat. 2134967, IPC A01N 53/00, A01N 25/28 published 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-x the chemical deposition method nerastvorim using two precipitators - butanol and heptane, the retrieval process is carried out without special equipment.

A distinctive feature of the proposed method is the use of sodium carboxymethylcellulose as the shell of the microcapsules, fenbendazol as their cores, and the use of two precipitators - butanol and heptane.

The result of the proposed method are obtaining microcapsules of fenbendazol in the sodium carboxymethyl cellulose at 25°C 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 carboxymethylcellulose in heptane containing the specified 300 mg of the polymer in the presence of 0.01 g of the drug E472c under stirring about 1000/sec. Then poured 2 ml of butanol and 1 ml of distilled water. The resulting suspension is filtered and dried at room temperature.

Received 0,396 g white to yellowish powder. The yield was 99%.

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 carboxymethylcellulose in the heptane, containing the specified 300 mg of the polymer in the presence of 0.01 g of the drug E472c under stirring about 1000/sec. Then poured 2 ml of butanol and 1 ml of distilled water. The resulting suspension is filtered and dried at room temperature.

Received 0,396 g white to yellowish powder. The yield was 99%.

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 carboxymethylcellulose in heptane containing the specified 300 mg of the polymer in the presence of 0.01 g of the drug E472c under stirring about 1000/sec. Then poured 2 ml of butanol and 1 ml of distilled water. The resulting suspension is filtered and dried at room temperature.

Received 0,396 g white to yellowish powder. The yield was 99%.

The obtained microcapsules of fenbendazol physico-chemical method for the deposition nerastvorim using two precipitators - butanol and heptane, 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, simplicity on the teachings 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 from solution in heptane by adding as herstories butanol and water at 25 °C.



 

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