JPS61238336A - Preparation of coated material having gradual release property - Google Patents

Abstract

PURPOSE:To lower the elution rate of a hardened oil coating agent in water, by suspending a fine particulate water-soluble substance to be protected in a coating agent based on solid hardened oils and fats and solidifying the resulting suspension under cooling and subsequently heating the solidified one to specific temp. before aging the same for a specific time. CONSTITUTION:A fine particulate water-soluble substance to be protected is suspended in a coating agent based on solid hardened oils and fats. The resulting suspension is solidified under cooling and the solidified one is subsequently heated to 58-45 deg.C and held and aged for 20min-30hr to prepare a coated material. As the water-soluble substance to be protected being the core substance to be coated, there are foods, food additives, pigments or drugs and for example, aspartame, phytic acid and 5'-ribonucleotide are designated. As the coating agent of the core substance, waxes such as rice wax and a surfactant such as stearic monoglyceride are designated.

Description

Detailed Description of the Invention [Industrial Field of Application] The present invention relates to a coating method in which a solid hardened oil or fat is used as a coating agent in a method of coating with an oil or fat wax so that water-soluble substances are hardly eluted in an aqueous solution. Concerning methods for improving the quality of products.

[Conventional technology]

Conventionally, hydrogenated oil, such as rapeseed rapeseed oil, does not dissolve at room temperature, but when heated to 60 to 65°C, the core material dissolves.It has been used to manufacture coatings for the purpose of leaching, but the leaching in water at room temperature is hardening. Since it has a much higher melting point than beef tallow, hydrogenated castor oil, etc., its use was avoided unless the melting point could not be obtained with other fats and oils. This point was the same even when hydrogenated rapeseed oil and other fats and oils were mixed together and the melting point was set to an arbitrary temperature between the melting points of the oil alone, and the dissolution rate was low.

Further, in order to reduce the elution rate, addition of a surfactant, total change in the moisture content of the core material, and addition of wax have been investigated, but little effect has been seen.

[Problem that the invention seeks to solve]

The present invention reduces the high dissolution rate in water, which is a problem when using hydrogenated oil as a coating material, as described above, and by heating and aging it after hardening and solidifying, which hardly dissolves in water at room temperature. The present invention was completed by discovering that the dissolution rate can be significantly lowered, and that other solid hardened fats and oils also have the effect of lowering the dissolution rate.

The present invention is a method for improving the quality of a coating material, which uses solid hardened oil as one of the main components as a coating material, and is characterized by carrying out heating aging after cooling and solidification.

In the present invention, the core substance to be coated, that is, the water-soluble substance to be protected, is food, food additives, feed, pharmaceuticals,
Examples include aspartame, finic acid, 5'-limenucleotides, methionine, lysine, and the like.

As a coating material for the core material, not only solid hardened oils and fats can be used alone, but also
A substance that is miscible with the solid fat when heated and melted and solidifies at room temperature can be added to the solid hardened fat for use. Examples of the substance include waxes such as rice wax and surfactants such as stearic acid monoglyceride.

There are no particular restrictions on the method for completely covering the core material, and known methods can be used. For example, there are methods of dispersing the core material in a molten coating agent and spray cooling, and electrostatic spray coating with a molten coating agent while the core material is flowing.

After these coatings are cooled and solidified, they are heated to a temperature below the melting point of the solid hardened oil and fat, then maintained at that temperature, and then cooled to room temperature to obtain coatings with a low elution rate. If the temperature is too high, grains will adhere to each other and solidify, and if the temperature is too low, the time required for ripening will be significantly longer, so a temperature of 45°C to 55°C is preferable. Since ripening is considered to be a type of reaction, the temperature holding time may be shorter as the temperature is higher.
It takes 2 days at 0°C.

The reason for the lower elution rate of the present invention is not clear, but for example, in the case of rapeseed hydrogenated fat alone, the melting point is around 60°C when cooled and solidified alone, but when heated and aged according to the present invention, the melting point is lower. Considering that the temperature rises to 68°C, it is inferred that the arrangement of the fat and oil crystals changes, resulting in a denser and improved covering property.

Hereinafter, the effects of the present invention will be specifically explained based on Examples. For dissolution rate, 100 rpm in water for a specified time.
The amount eluted into water was determined by shaking.

Example 1 Coating agent: 60 parts of hydrogenated rapeseed oil Core substance: 40 parts of anhydrous lysine hydrochloride powder Coating method: Heat-melt hydrogenated rapeseed oil and add non-hydrochloride to 80°C, stir at high speed to disperse, and cool. It was dropped onto a stainless steel plate and left to cool and solidify. The produced grains were sieved and all 1.0 to 1.5 grains were collected. The grains were heated and aged in a thermostat at 45°C, 50°C, or 55°C, allowed to cool, and two days later, aged at 24°C in water at 40°C.
The elution rate over time was measured.

Experimental area Aging temperature Heating time Difference "Actual axis 1, No treatment -19% 54℃ 2, Invention method 1 55℃ 0.5 hours 5%
68℃3, tt 2 50℃ 2
Time 4% 68.5℃4, tt 3 4
5° C. 10 hours 5% 68° C. As is clear from the above results, heating aging has a significant effect of lowering the dissolution rate.

Example 2゜Coating agent: 50 parts of hydrogenated rapeseed fat, 50 parts of hydrogenated soybean fat
20 parts and 0.2 parts of sugar ester (HLB2) Core material: 30 parts of sodium inosinate powder Coating method: Heat and melt the coating material (75°C), add sodium inosinate, stir at high speed to disperse well, and seal. Put it in a container,
Pressurized with compressed air to 1.5 KG, sprayed from a spray nozzle connected to the container at the top of the cooling tower where cooling air is sent, cooled and solidified, and the particles collected in a cyclone were heated to a temperature of 55°C. It was heated and aged for 50 minutes. - Particle sizes ranging from 420μ to 500μ were collected through a sieve, and the dissolution rate was measured after 2 hours in water at 35°C.

Result 1 20 parts 50 parts Untreated -24% 59℃2
〃 〃 55℃ 50 minutes 5% 64
℃3 50 parts 20 parts Untreated, 22 pieces 61
℃4 /I /l 55℃ 50 minutes 7chi 67℃Example 3゜As a coating material, 65 parts of extremely hardened beef tallow was melted at 75℃, and the fine particles and coarse particles from the previous production were mixed and melted to 75℃. ℃, mixed and dispersed 35 parts of sodium guanylate fine powder, solidified particles by spray cooling method, and sieved to 177~
Collect particles with a particle size of 590 microns and heat them to 50°C.
After reaching the temperature, the mixture was kept for 2 hours and aged to obtain coated grains.

Incidentally, fine particles of 177 microns or less and coarse particles of 590 microns or more were recycled.

The dissolution rate was measured by shaking in water at 35°C for 60 minutes.

On the other hand, when comparing the dissolution rates of untreated products without aging and those subjected to aging for 36 hours, the dissolution rates of the method of the present invention were lower than those of the untreated products, as shown in the following table.

Furthermore, excessive aging for 36 hours increased the dissolution rate and had the opposite effect.

Claims (1)

[Claims] 1. A method for producing a sustained-release-in-water coating by suspending a finely divided water-soluble substance to be protected in a solid fat as a coating and cooling and solidifying the coating. 1. A method for producing a sustained release coating, which contains a solid hardened oil or fat as a main component, is cooled and solidified, is then heated to 58°C to 45°C, and is maintained and aged for 20 minutes to 30 hours. 2. The method for producing a sustained-release coating according to claim 1, characterized in that the coating material is a solid hardened oil with wax and/or monoglyceride added.