JPS602018B2 - Manufacturing method for soybean protein coating film - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in packaging and casing materials for livestock and fishery products using cellophane.

In general, when packaging or casing these food materials, the food materials have a relatively high moisture content and are often treated in a wet state after packaging or casing, so the food materials may be contaminated during the manufacturing process or storage. It is generally accepted that free water accumulates between the surface and the packaging or casing material, impairing the appearance of the food, losing the freshness of the food, and that the perishability of the food material is closely related to this free water. ing.

The purpose of the present invention is to prevent the generation of free water, particularly when cellophane is used, and to produce an improved protein coating film based on cellophane suitable for that purpose. As a matter of fact, cellophane is also widely used in parallel with synthetic resin films for the packaging of livestock and fisheries products and similar products. The use of cellophane is not only economical, but compared to synthetic resin film,
They differ in various properties such as dyeability, water permeability, wettability, and shrinkage during drying, and these properties are effectively utilized. However, when various treatments are applied to packaged foods or during storage, free water is generated and the food and film separate, resulting in a product that has no physical sensation, and in extreme cases, sharks may develop on the film and the product It may significantly reduce the value. This phenomenon often occurs because food products shrink over time when subjected to various treatments or during storage. When cellophane is used as a packaging or casing material, due to the water permeability of cellophane, free water generated during storage evaporates to the outside and is unlikely to cause any actual damage; When subjected to heat treatment, cellophane peels off from the surface of the food due to its swelling properties and free water generated from within, and even if the packaging surface dries after the moist heat treatment, the product does not return to its original packaging state. Often reduces value. In consideration of these points, when cellophane is used as a packaging or casing material, it is generally a double-layered packaging or casing material in which a synthetic resin film is layered on the outer layer. The synthetic resin film on the exterior will not be affected by moisture from the outside even when subjected to moist heat treatment, but since the packaging or casing is made of a material with a high moisture content, the cellophane will swell and expand due to the influence of internal moisture, reducing its commercial value. descend. The present inventor has reported a protein coating film in which protein is coated on cellophane as a packaging or casing material for livestock and fish paste products, etc., according to the invention of Samurai Application No. 51-80225.

When food packaged or cased using this film is subjected to moist heat treatment, the protein film on the film transfers to the surface of the food material, forming a protective film with excellent gloss on the surface of the food material, increasing its commercial value. reported that it improved. When food materials are packaged or cased using this protein-coated film, the presence of the protein film alleviates the above-mentioned releasability between the food materials and cellophane, and a certain degree of effect can be expected. However, the adhesion between the cellophane and the protein film is poor to varying degrees, and it has not been possible to completely prevent the phenomenon in which the cellophane peels off from the protein film that adheres to the surface of the food material during the overheating process. The present invention relates to the production of an improved soybean protein coating film for the purpose of preventing the separation of cellophane from food materials due to the swelling of cellophane or the generation of free water. After the surface is treated with hypochlorites, an aqueous solution containing soybean protein is applied and dried to improve the adhesion between the cellophane and protein film during wet processing, making the soybean highly resistant to yield and release phenomena. A protein coated film is obtained.

That is, in the present invention, prior to applying an aqueous solution containing soybean protein to cellophane, cellophane is coated. Treat the fan with a strong oxidizing agent selected from the hypochlorites. The oxidizing agent treatment is carried out by soaking the cellophane in an aqueous solution of hypochlorite having an available chlorine concentration of about 0.5 to 5 mm/cm or by applying the solution to the surface of the cellophane. The cellophane treated with the oxidizing agent is dried before the subsequent step of applying the soybean protein-containing aqueous solution.
Drying is preferably carried out at a temperature of 30 to 70 oo and under drying conditions of about 5 to 3 quartz sand, but the conditions are appropriately selected depending on the conditions of oxidation treatment, the conditions of application of the soybean protein-containing aqueous solution, etc. If the drying is insufficient, the soybean protein-containing aqueous solution applied in the next step and the oxidizing agent aqueous solution will diffuse into each other and the oxidizing agent will be removed at the contact area between the cellophane surface and the soybean protein-containing aqueous solution. This is not preferable as it may reduce the effectiveness, and the end point of the drying process is usually the point at which the presence of water droplets disappears on the cellophane surface. In addition, excessive drying decomposes hypochlorite and reduces the formation of chemical bonds between cellophane and the soybean protein-containing film that occur due to the presence of hypochlorite after applying the soybean protein-containing aqueous solution. Undesirable. The oxidizing agent treatment conditions and drying conditions are such that the hypochlorite impregnated or attached to the treated cellophane is available chlorine of 0.03 to 0.
It is desirable that the amount is less than 1g/. The amount of available chlorine can be calculated by leaching a certain area of cellophane with a sufficient amount of cold water and determining the concentration of available chlorine in the leached solution by iodometry. If the amount of available chlorine is 0.0 total/or less, when the soybean protein-containing aqueous solution and cellophane come into contact, the chemical action of hypochlorite on the contact surface is insufficient, resulting in a lack of adhesion between the protein film and cellophane. Therefore, a preferable packaging material or casing material cannot be obtained. In addition, even if the amount of available chlorine exceeds 0.1 g, there is no particular adverse effect on adhesion as long as the cellophane does not deteriorate due to excessive oxidation. This is not preferable due to the phenomenon of fading. As the hypochlorite, sodium hypochlorite, hypochlorite potassium chlorate, or calcium hypochlorite is preferable. These hypochlorites activate the cellophane surface and improve the adhesion with the soybean protein-containing film. Application of the aqueous solution containing it lowers the pH and accelerates decomposition. Free radicals generated by the decomposition of hypochlorite after application of an aqueous solution containing soybean protein are thought to promote chemical bonding between cellophane and soybean protein, etc., resulting in strong adhesion between the two. The soybean protein-containing aqueous solution applied to the oxidizing agent-treated cellophane may contain soybean protein alone or in combination with animal and vegetable proteins such as egg white, casein, wheat gluten, or various oilseed proteins, and/or starches such as potato starch or cornstarch. (hereinafter referred to as proteins).

In the case of a mixture, it is preferable to contain soybean protein in an amount of 6% or more by weight based on the protein in relation to the wet tackiness of the formed film and the strength of the film. Furthermore, a plasticizer such as a polyhydric alcohol is added to the soybean protein aqueous solution for the purpose of imparting plasticity to the film formed on the cellophane. As the plasticizer, glycerin and/or propylene glycol are particularly preferred, and the amount thereof is 1 to 6% by weight based on the weight of the soybean protein-containing aqueous solution.
It is preferable to add The soybean protein-containing aqueous solution prepared with such a composition contains 4 to 20% by weight of proteins and has a PHI
It is desirable that it is 0 or less. Protein concentration is 4% by weight
If it is less than that, it is thought that the hypochlorite present on the cellophane surface diffuses into the aqueous solution, resulting in undesirable results. On the other hand, if the amount is more than 2% by weight, the viscosity of the aqueous solution increases, making uniform application difficult. Furthermore, if the pH is 10 or more, the decomposition of hypochlorite on the cellophane surface is delayed and tends to diffuse into the aqueous solution undecomposed, which is undesirable. In the present invention, when the purpose is to color the surface of livestock and fish paste products during packaging or casing, it is also possible to add an edible coloring material according to the purpose to the soybean protein-containing aqueous solution. In the present invention, the soybean protein-containing aqueous solution prepared as described above is applied to cellophane treated with an oxidizing agent, and then dried to obtain a protein coating film, but the application method and drying method are industrially possible. Either method is fine.

It is usually dried by hot air using a low-foo coating method. The thickness of the protein film of the resulting protein coating film is selected as appropriate depending on the purpose of use, but is usually 1.
~6r is common. The protein coating film thus obtained is used to package or casing the livestock and fishery paste product material, and then subjected to hot water treatment in which it is immersed in about 80 qo of hot water for about 2 hours, so that the cellophane is peeled off from the surface of the material. There is almost no free water between the cellophane and the protein film, and a livestock and fishery paste product with a desirable appearance can be obtained.

Furthermore, when the cellophane of the product is peeled off, the coated protein film may migrate to the surface of the product material and impart beautiful photo-selectivity to the material surface, or conversely, it may remain on the cellophane and impart a beautiful photo-selectivity to the material surface. may not be given.

Although this depends on the characteristics of the food material, it is related to the amount of hypochlorites that adhere to the cellophane surface. In most cases, the amount of available chlorine is about 0.07 g, and if the amount is larger than this, the protein film will remain on the cellophane surface, and if the amount is a little, it will migrate to the surface of the food material. In either case, the adhesion between the food material and cellophane during moist heat treatment is good, and the protein film has sufficient strength to withstand the resistance to peeling from each surface, so peeling spots do not occur. rare.
Example 1 Three layers of cellophane were continuously applied to a gravure coating device.
It is fed at a speed of 2 h/min.

Se. While the fan passes through the device, apply a subbox sodium chlorate aqueous solution containing 1.2% available chlorine to a thickness of about 5 r,
After application, water is loosened and evaporated through a first drying step of warm air at 60°C, and then 26 parts of isolated soy protein, 7 parts of glycerin, and water are extracted using an acid precipitation card from soy milk obtained by extracting defatted soybeans. 167 parts of a soybean protein-containing aqueous solution with a pH of 8.0 was applied to a thickness of about 7R, and was completely dried through a second drying step of hot air at 60° C. to obtain a soybean protein coated film. In this case, the cellophane immediately after the first drying step is 0.
．． The soybean protein-containing film having an available chlorine content of 0.05 g/l and adhering to the cellophane after the second drying step had a thickness of about 1.0 μm. The obtained soybean protein coating film is adhered with the soybean protein-containing film on the inside to create a cylinder with a diameter of h/m. This cylinder is inserted into a vinylidene chloride film tube of approximately the same diameter to form a casing material. On the other hand, fill the casing material with sausage base obtained by mixing and grinding 1.7 k9 of pork, 3 k of salt, 6 k of starch, and 30 k of ice, and tie both ends to a length of about 30 k. , 80:00 pm, boiling water treatment for 5 minutes.

After cooling, the vinylidene chloride tube was peeled off and its appearance was observed. The surface of the cellophane was smooth, and no moisture was observed to be released between the cellophane and the surface of the contents, which were in close contact with each other.
Further, when the cellophane was peeled off, the cellophane was peeled off with a sense of resistance, and the contents were surrounded by a gel-like soybean protein film, forming a beautiful photosensitive surface. Example 2 Commercially available chlorine powder (available chlorine 30%) is dissolved in water to form a solution containing 0.1% available chlorine, and cellophane is soaked in this solution.

When the entire surface of the cellophane is wetted with the solution, the cellophane is taken out, drained, attached to a glass plate, and dried in a 60 qo hot air dryer for 3 hours to evaporate moisture on the surface. The available chlorine of the sardine powder adhering to both the front and back surfaces of the cellophane immediately after drying was 0.05 mcm. While this cellophane was pasted on a glass plate, a soybean protein-containing aqueous solution consisting of 21 parts of soybean protein powder ("FujiPro R" manufactured by Fuji Oil Co., Ltd.), 9 parts of corn starch, 6 parts of propylene glycol, and 164 parts of water was adjusted to pH 8. Apply to the surface of the cellophane to a thickness of 30 mm. The coated cellophane (while still attached to the glass plate) was dried again in a hot air dryer at 60:00 for 1 minute, and then the cellophane was peeled off from the glass plate to obtain a soybean protein coated film. The thickness of the soybean protein-containing film of the obtained soybean protein coating film was 5.6〃. This soybean protein coating film was glued with the film on the inside to make a cylinder with a diameter of 3 plates/m, and the cylinder was inserted into a vinylidene chloride film tube having approximately the same diameter as the cylinder to form a casing material. On the other hand, 180 female pollock cod, 8 starch
The casing material was filled with a kamaboko raw material paste made by mixing and grinding 45 g of common salt and 50 g of water, tied at both ends to a length of approximately 20 cm, left at 30 qo for 1 hour, and then heated at 85°C for 2 hours.
A boiling water treatment was performed for 0 minutes to obtain kamaboko.

When the outermost vinylidene chloride film of this kamapoko was peeled off and its appearance was observed, it found that it had a smooth surface similar to the sausage of Example 1, and no moisture was found to be released between the cellophane and the kamaboko.When the cellophane was further peeled off, there was no sense of resistance. The surface of the kamaboko that was peeled off was surrounded by a gel-like soybean protein film and had beautiful photosensitivity.

Example 3 Soybean protein with a pH of 8, consisting of 26 parts of isolated soy protein, 7 parts of glycerin, 5 parts of food coloring red No. 3, and 162 parts of water, was prepared using acid-precipitated curd from soy milk obtained by extracting dehulled soybeans. Saw sage was prepared in the same manner as in Example 1 except that an aqueous solution was used.

When the outermost vinylidene chloride film of the obtained sausage was peeled off and its appearance was observed, the cellophane had a smooth surface, and no free water was observed between the cellophane and the sausage. Furthermore, when the cellophane was peeled off, it peeled off with a sense of resistance, and the contents were surrounded by a red gel-like film and had a photosensitive surface. Example 4 In the same manner as in Example 1, an aqueous sodium hypochlorite solution containing 2.4% available chlorine was used to apply 0.1% available chlorine onto cellophane.

The obtained film was made into a tube-shaped casing material in the same manner as in Example 1, filled with the same sausage material, and treated with hot water in the same manner to obtain sausage.

When the vinylidene chloride tube of the obtained sausage was peeled off, the cellophane adhered to the surface of the food material, and no free water was observed between the two. When the cellophane was further peeled off, a large peeling resistance was felt, and the protein film remained uniformly on the cellophane surface, and no photo-selectivity was imparted to the food material surface.

Claims (1)

[Claims] 1. In the production of a soybean protein coating film used as a packaging material or casing material for livestock and aquaculture products or similar products, cellophane is used as the base film, and the surface of the cellophane is treated with hypochlorous acid. A method for producing a soybean protein coated film, which comprises treating the film with salts, then applying an aqueous solution containing soybean protein and drying the film. 2. The method according to claim 1, wherein the hypochlorite is sodium hypochlorite, potassium hypochlorite, or calcium hypochlorite. 3 Hypochlorites to cellophane with available chlorine of 0.03
The method according to claim 1, wherein the method is treated so as to deposit an amount of ~0.1 g/m^2.