JPS5835863B2 - heat seal dekiru kashiyokuseicollagenmakuno seizouhouhou - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing an edible collagen membrane that can be heat-sealed, and more particularly to a collagen membrane produced by forming a membrane from an aqueous dispersion of collagen fibers and/or a stock solution consisting of an aqueous collagen solution. An edible film that can be heat-sealed without heat shrinkage, by dipping or coating a mixed aqueous solution of gelatin and a plasticizer on a collagen stock solution, or by adding and mixing a mixed aqueous solution of gelatin and a plasticizer to a collagen stock solution and then forming a film. The present invention relates to a method for producing a collagen membrane.

The heat-sealable edible collagen membrane obtained in the present invention is useful as a packaging material for various instant foods, particularly instant noodles, powdered soups such as cups, instant soup mixes, instant powdered shiruko, instant curry mixes, and the like.

Generally, powder soups for instant ramen noodles, powder mixes for various instant foods, etc. are enclosed in various packaging materials such as aluminum-polyethylene laminate, cellophane polyethylene laminate, various plastic sheets, etc. to prevent moisture and prevent aroma from escaping.

In addition, in instant cups, powdered soup is placed at the bottom of the cup without packaging.

However, if it is packaged, it is necessary to tear it manually to remove the contents during cooking, and if it is not packaged, the flavor tends to escape and moisture is easily absorbed, resulting in a deterioration in flavor.

For these reasons, there has been a desire for a packaging material for the above-mentioned powdered soup etc. that has the functionality of a conventional packaging material, dissolves or disintegrates in hot water, and is edible.

In addition to the above conditions, the material must be heat-sealable in order to simplify the packaging process.

An object of the present invention is to provide a method for producing an edible packaging material that satisfies the above conditions.

Collagen is a tissue that makes up animal skin, keys, etc.
It is now put to practical use as an edible sausage casing.

However, this type of sausage casing cannot be heat sealed.

That is, in the case of edible collagen membranes made of collagen and plasticizers such as water and polyhydric alcohols, such as those used in conventional collagen sausage casings, even if the membranes are heat-pressed together at a temperature below the melting temperature of collagen, there is almost no damage. However, if the membranes are bonded by heat and pressure at a temperature higher than the melting temperature, the membranes can be bonded together, but the collagen will shrink due to heat, making it easy to break and have a bad appearance.

On the other hand, glue or gelatin has long been used as an adhesive, and when used, a plasticizer is added and the adhesive is heated and melted.

The melting temperature of collagen and glue or gelatin is
Although it varies depending on the mixing ratio with plasticizer, conditions such as pH, and form, when comparing under the same conditions,
It is generally known that collagen is 10 to 60°C higher.

As described above, the present inventors added gelatin or glue and a plasticizer to collagen to create a film composed of these three components.

We focused on the fact that gelatin and glue exhibit adhesive properties at temperatures above their melting temperatures, and if the ratio of the three components is appropriately selected, the difference in melting temperature between collagen and gelatin or glue can be sufficiently reduced as described above. can be given to
Moreover, they discovered that by heat-pressing this three-component film at a temperature below the melting temperature of collagen and above the melting temperature of gelatin or glue, it was possible to easily heat-seal without damaging the appearance. Further experiments were conducted to complete the present invention.

The outline of the embodiment of the present invention is as follows.

The aqueous dispersion of collagen fibers used, the aqueous collagen solution, or a mixture of both at a concentration of 1 to 5% w/v, p
Adjust to H3.0 and use it as a collagen stock solution.

This aqueous dispersion of collagen fibers is obtained by, for example, depilating adult cow skin and removing the meat, mechanically crushing the skin, making it fine, and dispersing it in water.

The aqueous collagen solution can be produced, for example, by dissolving purified adult cow hide as described above in water without denaturation using the oxygen method described in Japanese Patent Publication No. 44-11037 or the alkaline method described in Japanese Patent Publication No. 46-15033.

The obtained collagen stock solution is, for example, the known Japanese Patent Publication No. 1973-
Wet method described in Publication No. 4145 or Japanese Patent Publication No. 1987-75
The film is formed by the dry method described in Publication No. 1.

A collagen film formed by a dry or wet method and dried is immersed in the gelatin-plasticizer mixed aqueous solution, or a mixed melt consisting of 20 to 90 parts by weight of gelatin and 80 to 10 parts by weight of a plasticizer is applied to the collagen film. By doing so, the desired heat-sealable collagen membrane can be manufactured.

In addition, in the case of a wet method, 2-10% (W/V) gelatin and 0.5-7% gelatin are added before drying the formed collagen film.
It is also possible to form a film by immersing it in an aqueous solution containing a plasticizer (W/V) and then drying it.

The immersion time in the aqueous solution of gelatin and plasticizer and the amount of gelatin and plasticizer mixture applied vary depending on the concentration or mixing ratio of the aqueous solution or mixture used.

When forming a film by adding and mixing gelatin and a plasticizer in advance to an aqueous dispersion of collagen fibers, an aqueous collagen solution, or a mixed stock solution of both, this mixed solution may be discharged and cast onto a support in the air. Alternatively, the film may be formed by a so-called dry method in which it is simply discharged into the air.

Another method is to add and mix only gelatin to the collagen stock solution and form a film using a wet or dry method.
It can also be immersed in a ~7% (w/v) aqueous plasticizer solution or coated with a plasticizer.

The following table shows changes in the melting temperatures of gelatin and collagen depending on the mixing ratio of the air-dried mixture when gelatin and a plasticizer (glycerin) are added and mixed with collagen.

After the mixture was air-dried, it was left in air at a relative temperature of 65% for a while, and then a tabletop differential calorimeter model YC manufactured by Rigaku Denki Co., Ltd.
If gelatin and plasticizer are mixed in a ratio other than that indicated on the cloth, for example, if gelatin or plasticizer is present in extremely small amounts, good heat sealing will not be possible and the plasticizer will If the amount of collagen is extremely large, the resulting collagen film will be hygroscopic and will become sticky even if left in the atmosphere.

Therefore, by preparing a collagen membrane having a composition within the mixing ratio range shown in the table, properties that satisfy the objectives of the present invention can be obtained.

The three components of the heat-sealable edible collagen film of the present invention, collagen, gelatin or glue, and plasticizer, are 5 to 80% and 5 to 90%, respectively, based on dry weight.
% and 5 to 60%, preferably 5 to 6%, respectively.
0%, 10-80% and 10-50%.

The present invention will be explained in detail below with reference to Examples.

Example 1 An aqueous dispersion of collagen fibers was obtained by washing, hair removal, and micronization of adult cow hide using a known method, and an aqueous collagen solution was obtained from the micronized hide using the method described in Japanese Patent Publication No. 15033/1983. .

80 parts by dry weight of an aqueous dispersion of collagen fibers and 20 parts of an aqueous collagen solution were mixed to give a pH of 3.0 and a collagen concentration of 3%.

This collagen mixture, 3% gelatin solution and 4%
% glycerin solution in proportions of 50 parts, 20 parts, and 30 parts (weight ratio), and after defoaming, the dry film thickness was 30 to 35 μm.
Spread it out on an acrylic plate and air dry it.

When two of the resulting membranes were stacked together and heat-pressed at 65°C, heat sealing was achieved without thermal shrinkage.

Example 2 The collagen mixture of Example 1 with a pH of 3.0 and a concentration of 3% was discharged into a saturated saline solution with a pH of 3.0 through an annular nozzle and coagulated, and the coagulated solution was adjusted to pH with 0.1M Na2CO3.
The sample was immersed in a 10% saline solution adjusted to a concentration of 9.5 for 60 minutes, and then washed with running water to desalinate.

The resulting tube was mixed with 7.2% gelatin and 2% glycerin.
．． After being immersed in a 0% mixed aqueous solution for 30 minutes, the tube was dried with warm air at 40° C. under an air pressure of 70 mmH2O inside the tube.

The dry weight ratios of collagen, gelatin and glycerin in the tubes were 62%, 23% and 15%.

When heat and pressure bonding was carried out at 70°C, heat sealing was possible without causing thermal shrinkage.

Example 3 The collagen mixture prepared in Example 1 was defoamed,
After that, an air-dried film of 30-35μ was made on an acrylic plate.

A mixed melt of 75 w/w % gelatin and 25 w/w % glycerin was applied to this dried collagen film and dried.

The resulting membrane contained 72%, 21% and 7% collagen, gelatin and glycerin by dry weight, respectively.

When this film was heat-pressed at 75° C., it could be heat-sealed without causing thermal shrinkage.

Reference Example When the collagen membrane according to the present invention was used to encapsulate powdered ramen soup and store it together with the noodles for a long period of time, it did not absorb moisture and no other problems were observed.

In addition, a collagen membrane containing ramen powder soup was
When immersed in hot water at 0°C, the sealed area peeled off in 1 to 5 seconds, the contents easily dissolved in the hot water, and the collagen membrane dissolved or disintegrated in 10 to 30 seconds.

Claims (1)

[Scope of Claims] 1. A collagen membrane is formed by a wet method or a dry method using an aqueous dispersion of a collagen membrane, an aqueous collagen solution, or a collagen stock solution consisting of a mixture thereof, and the resulting collagen membrane is mixed with gelatin or glue and a plasticizer. or by applying a mixed aqueous solution of gelatin or glue and a plasticizer to the collagen membrane, the dry weight of collagen, gelatin or glue, and plasticizer is 5-80% and 5-90%, respectively. A method for producing an edible collagen membrane that can be heat-sealed without causing heat shrinkage, characterized by containing 5 to 60% of collagen. 2. A collagen stock solution consisting of an aqueous dispersion of collagen fibers, an aqueous collagen solution, or a mixture thereof is mixed with gelatin or a mixed aqueous solution of glue and a plasticizer in advance, and the mixed solution is used to form a film by a dry method. 5 to 80%, 5 to 90% and 5 to 90% of collagen, gelatin or glue and plasticizer by dry weight, respectively, to the film.
A method for producing an edible collagen membrane that can be heat-sealed without causing heat shrinkage, characterized by containing 60% collagen.