KR830001813B1 - Food preservation method - Google Patents

Abstract

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Description

Food preservation method

1 is a view showing a food preservation tool of the first embodiment.

2 is a view showing a food preservation tool of the fourth embodiment.

3 is a view showing a state in which the bread is preserved as a food preservation tool.

The present invention relates to a food preservation method using ethyl alcohol.

Prior art of the present invention is Japanese Patent Laid-Open No. 55-2273. In this prior art, an adsorbent in which ethyl alcohol is adsorbed on an adsorbent is disposed between food housings, and ethyl alcohol gas emitted from the adsorbent prevents mold and decay of food.

However, in this prior art, the adsorbent is merely used in an exposed or partially open container. This prior art differs from the present invention in that ethyl alcohol is used in an adsorbed state.

An object of the present invention is to provide a new method of preservation of food to prevent the occurrence of mold and corruption in the food. Another purpose of the present subject is to suggest food and utensils for use in the new preservation methods described above.

The outline of the present invention relates to a food preservation method for arranging a container containing a liquid containing at least 50 volumes of ethyl alcohol in a packaging container partially formed of an ethyl alcohol gas permeable film together with food in a food container. .

When the tool of the present invention is sealed with ethyl alcohol wet cotton, cloth, paper, etc., in addition to food preservation, sanitary tools for cleaning and disinfecting hands with cotton, cloth, paper, etc., before food handling are used. Can also serve.

In the case where the liquid containing 50% by volume or more of ethyl alcohol of the present invention is in a gel state, the ethyl alcohol may not flow out even if the packaging container is partially destroyed.

Ethyl alcohol gas permeability 20g / ㎡ / 24hr / 50% RH / 40 ℃ means gas permeability of the film. More specifically, erythryl per film per square meter for 24 hours under 40% relative humidity at 40 ℃ It indicates that the weight of the alcohol gas is 20 g. This measurement is performed according to the method (JIS Z-0208) generally used for the measurement of the water vapor transmission amount of a resin film using ethyl alcohol in a 95 degree Japanese pharmacy room. The packaging container means a metal, glass cup, beaker or bag made of film.

It is known for a long time that ethyl alcohol has disinfection and sterilization effect. However, the method of preserving food with alcohol is separate, and Japanese Patent Publication No. 53-44642, filed jointly by the present applicant, discloses a specific and practical method of preserving food using ethyl alcohol gas.

The method disclosed in Japanese Patent Laid-Open No. 53-44642 (hereinafter referred to as "adsorbent method" for short) is an adsorbent obtained by adsorbing ethyl alcohol to an adsorbent material. It is a food preservation method of sealing the housing by placing it so as not to be in direct contact with the food. The adsorbent method is already used in many ways as a practical method for preserving food using alcohol gas.

The present inventors have repeatedly examined the adsorbent method, and as a result, the liquid containing ethyl alcohol or the ethanol of the ethyl alcohol is enclosed in a packaging container composed of a film that is easily permeable to ethyl alcohol, and placed in a food container. It has been found that sealing the enclosure can achieve the same purpose as the adsorbent without using the adsorbent, thus completing the present invention.

The difference between the present invention and the adsorbent method is the presence or absence of the use of the adsorbent. The use of the adsorbent is an essential condition of the adsorbent method but does not require this requirement in the present invention. In the adsorbent method, the volatility of alcohol gas can be changed by selecting the adsorbent, but the following drawbacks exist. (1) When the adsorbent is placed in a small bag, the packing property is remarkably poor compared to using the liquid or gelled substance of the present invention.

(2) Since the adsorbent is used, volatilization of ethyl alcohol and gas is prevented. The present invention proposes a food preservation tool which is a small and economical source of ethyl alcohol gas which solves these drawbacks and does not require the adsorbent material required for the adsorbent.

The ethyl alcohol gas permeability of the various films was measured at 95 ° C. according to the method described above, and the results as shown in the following Table 1 were obtained. In the present invention, it is essential to use a packaging container composed of a certain portion of a film having an ethyl alcohol gas permeability of 20 g / m 2/24 hr / 50% Rh / 40 ° C. or more. Even if the film permeates ethyl alcohol gas, the film having poor permeability which does not meet the above conditions cannot satisfactorily exhibit the effect of food preservation. A 2.5 cm square small pouch consisting of a predetermined film was filled with 3 ml of Japanese pharmacy spirit alcohol and sealed. The food preservation tool proposed by the present invention is sealed in a large bag made of nylon / aluminum / polyethylene (20μ / 7μ / 20μ) together with one loaf of bread at 25 ° C. and a relative humidity of 80% and left in the same environment. The result of having observed the generated situation is shown in a 2nd table | surface.

[Table 1]

Ethanol gas permeability measured value of various films (g ° ㎡ / 24hr / 50% RH / 40 ℃)

In the table above, it means lamination. EVA stands for ethylene vinyl acetate.

[Table 2]

In the table above, Empra-OV is double-sided K-coated polyvinyl alcohol, KOP is K-coated polyprop, PE is low-density polyethylene, KNY is K-covered nylon, EVA 7% is ethylene vinyl acetate, acetic acid 7%, K Coating means vinylidene chloride coating and NY stands for nylon.

No silver mold

+ Caused some mold

++ mold is all over

In the present invention, an ethyl alcohol gas permeability of 20 or more is used. As the gas permeability is greater, the sterilization effect is quickly exerted on the food in the container. Therefore, the permeability is preferably 100 or more, preferably 500 or more.

The present invention is also meaningful to suggest a food preservation tool for use in the present invention described above. As a specific example, it is a preservation tool of the food which stuffed one of cotton, cloth, paper, sponge powder, or nonwoven fabric, or its combination material in 50 volume% or more of ethanol aqueous solution, and sealed it in the packaging container. It is not only used for food preservation but also for hand washing as described below. The state wetted in the ethanol aqueous solution described above refers to a state in which the ethanol aqueous solution easily adheres to the contact in the liquid phase of the ethanol aqueous solution.

In the adsorption state, apparently dry, the contacting liquid does not separate. Hand wipes are used for disinfecting sterilized plain paper attached to sandwich packaging or lunch box, cloth or non-woven fabrics with sterilizing liquids such as ethyl alcohol solution, and folding them to seal ethylene film or polyolefin laminate aluminum foil. There is. The above-described food utensils of the present invention can be used for cleaning hands by putting together a bag-type thing in a food packaging container. In particular, the hand-washing article of the present invention is used in the storage of bread, confectionery, etc. so that it can be used to wipe hands, but it can be used as a food preservation device, thus preventing the decay of the bread, confectionery, etc. Can work together. If food preservatives for suppressing mold and rot are exposed to bread, confectionery, etc., the customer is likely to recall that the food preservation equipment is deteriorated or decayed. It is easy to see how much practical value it would have to be placed in a food container.

Next, the effects of the present invention will be described.

Ethyl alcohol inside the packaging container is diffused into the food container in the form of gas through the film having good permeability of ethyl alcohol gas, which sterilizes microorganisms such as bacteria or mold attached to the food to prevent its deterioration or corruption. It is effective.

Since it is a thin gaseous gas of ethyl alcohol, it does not deteriorate the taste or color taste of food. Comparing the present invention with the adsorbent method described above, which is the prior art, it overlaps with some of the above descriptions, but has the following advantages.

(1) In the present invention, the liquid of ethyl alcohol or gelled thereof is used without using an adsorbent, so it is excellent in that it can provide a powerful and small source of ethyl alcohol without being noticeable.

(2) In the adsorbent method, there is an embodiment in which the adsorbent is enclosed in a packing stand of a small punched film (in the present invention, such a packing stand can be used when the ethyl alcohol solution is gelled). Packaging of perforated film is expensive and expensive. In the present invention, since a film having good permeability of ethyl alcohol gas can be used, the subsidiary materials are cheap and economical.

(3) Among the films used in the present invention, ethylene vinyl acetate triacetate cellulose, polyvinyl alcohol film and the like are sensitive to humidity, and when the temperature rises, the permeability of ethyl alcohol gas is improved. When such a film is used in the packaging container of the present invention, when food having a high surface temperature such as rice cake or castella is enclosed in the housing, the air in the housing rises in parallel with the surface temperature of the food. As a result, the permeability of the ethyl alcohol gas contained in the film is improved, and the ethyl alcohol gas is rapidly filled in the housing, resulting in a food preservation effect. In addition, when the food preservation device of the present invention is taken out from the food storage body in a low temperature state, the ethyl alcohol gas permeability of the film decreases, and the ethyl alcohol in the packaging container is not consumed unnecessarily.

(4) In the adsorbent method, the efficacy period of the adsorbent cannot be determined in appearance, but in the present invention, since the liquid or gel substance is directly used, the liquid is projected through the film, and the remaining shelf life of the food preservation tool is apparent. As soon as you know there is an advantage.

There are several ways to make ethyl alcohol gel.

For example, heated ethyl alcohol stearic acid may be dissolved to neutralize the stearic acid with potassium hydroxide, and then cooled to room temperature. Ethyl alcohol in which potassium stearate prepared in this manner is dispersed is sometimes called alcohol soap. Alcoholic soaps are generally gelled at room temperature but become liquid when heated, resulting in a sharp drop in viscosity. That is, the change of viscosity with temperature is large. Because of this property, the alcoholic soap can be used in the present invention to smoothly fill the liquid ethyl alcohol by heating at the time of filling.

After cooling to room temperature, the alcoholic soap becomes a gel state. The ethyl alcohol solution can be gelled by dispersing the ethyl alcohol affinity polymer in the ethyl alcohol solution. The gel ethyl alcohol thus prepared may also be used in the present invention. However, since the temperature decrease during the heating of ethyl alcohol liquid temperature to disperse the polymer material is relatively small, the filling is not preferable.

The food preservation device of the present invention is a sheet-shaped packaging container consisting of a film whose main surface is blocked and one side of the film is substantially free of ethyl alcohol silver, and the other side of the film has an ethyl alcohol gas permeability of 20 g / m 2 / 24hr / 50% or more. have. This sheet has various good properties as a food preservative. First, the food can be packaged directly into the sheet, wherein the ethyl alcohol gas permeable side is diffused to the inside of the packaged food by the emission of ethyl alcohol gas from the front surface of the inner surface. In addition, since ethyl alcohol gas is hardly emitted to the outside of the package, ethyl alcohol is saved.

Secondly, one side of the sheet is ethyl alcohol gas permeability, using a film with poor mechanical processability, and the other side of the sheet has a good mechanical treatability. Can increase.

Next, the supplement will be described in detail.

The vinylon film and cellulose film have a very notable property of passing through ethyl alcohol gas well under high humidity conditions but not easily passing through ethyl alcohol gas under high humidity conditions. However, these films are completely bent or stretched due to changes in humidity and temperature, and have poor mechanical treatment.

In addition, the film of the ethylene vinyl acetate copolymer having a vinyl acetate content of about 10% by weight or more is not completely bent or deformed according to changes in humidity and temperature, but has poor mechanical treatment.

However, the vinylon film, the cellulose film, the ethylene vinyl acetate film having poor mechanical treatment properties can also be made into a sheet belonging to the present invention in combination with the mechanically good film treatment property to make it suitable for mechanical treatment.

Thirdly, the sheet described above has the following advantages when both sides of the sheet can be salt bonded to each other.

Since the sheet contains ethyl alcohol in a gel state, it can generally be bonded by applying a thermally-adhesive iron appropriately heated to any part. Therefore, it is advantageous to manufacture the sheet compact sheet of the present invention, which has been manufactured once, so it is very easy. If the film contains solids such as powder containing ethyl alcohol, the thermal adhesion is not good.

Ethyl alcohol gas permeable film used in the present invention is a high ethyl alcohol gas permeability under high humidity, such as a vinylon film or a film of an ethylene vinyl acetate copolymer containing about 10% or more of vinyl acetate. If a packaging container containing a gelled alcohol is used, it has the following properties and is very preferable in practical use.

That is, since the above-described packaging container, for example, sheets are not generally placed at high humidity during manufacturing, transportation, or storage, the vinylon film or the ethylene vinyl acetate film constituting them do not permeate ethyl alcohol gas. However, once the foods having high equilibrium and high humidity in the sheet are packaged with an ethyl alcohol gas permeable film inside the sheet, the vinylon film or the ethylene vinyl acetate film may maintain moisture in equilibrium with high humidity. It absorbs and improves ethyl alcohol gas permeability. Therefore, it is possible to prevent the emission of ethyl alcohol gas when necessary, and usually the emission of ethyl alcohol gas. In addition, to exhibit the above properties, the sheet is placed in the housing together with the food, even if the food is not packed in a sheet.

Next, a method of manufacturing the sheet will be described with reference to specific examples. Sheets of the same size as polyvinyl alcohol films coated on vinylidene chloride on one side (substantially not through ethyl alcohol gas) and polyvinyl alcohol films are overlapped so that the polyvinyl alcohol sides are in contact with each other, and a sheet is formed by thermal compression around them. . The compression, however, leaves moisture for later injection of ethyl alcohol. Next, stearic acid is neutralized with potassium hydroxide in ethanol anhydride and injected between the film of the sheet and the film in a heated state (liquid state). After injection, the remaining ends are crimped and sealed. At this time, the excess air in the sheet is removed and the injection liquid is evenly distributed between the films as much as possible. In addition, if ethyl alcohol spreads to the entire surface of the sheet in liquid or gel state, it is not necessary to exceed it. The injected liquid gels upon cooling.

Example 1

This embodiment is shown in FIG.

As described in claim 2, 95% by weight of the Japanese pharmacy room ethanol (4) was placed in a cylindrical glass container (3) which had a film (2) of ethylene vinyl acetate copolymer that easily permeated ethanol vapor on the upper surface thereof. ) Container with food preservation equipment. This tool is placed together with food, that is, volatile deterioration and decay of food can be prevented. Figure 3 shows how to use this. In particular, the table 10 contains the bread 9 and the above-mentioned food preservation tools in the main body 13. The enclosure 10 is then sealed with a lid 12 of packing 11.

Example 2

The ethanol gas permeability is 2500g / m 2/24 hours / 50% RH / 40 ℃ and sealed in a small pocket of 2cm x 2cm consisting of 38μ triacetate cellulose film with a volume of 95% by volume of Japanese pharmacy. This small bag containing ethanol is called a small bag (food preservation equipment). The small pouches described above in 180 g of "Baumkuchens" surrounded by cellophane and the small pouch A above were placed in a 15 cm x 20 cm bag (food enclosure) made of aluminium film consisting of a layer of polypropylene and polyethylene spread out widely. Seal what was stored as follows. The entire bag containing the Baumkuchens and the small pocket A is called sample X. Sample X is prepared and referred to as sample Y so as not to use small pocket A.

Sample X and control Y were left in a room of 85% relative humidity of 30 ° C., and the contents were observed once daily to confirm mold growth. As a result, control Y showed mold growth at 40 days, whereas sample X containing small pocket A had no growth at 90 days. The above result is shown to a 3rd table | surface.

TABLE 3

Temperature: 30 ℃ Relative Humidity: 85%

-The fungus is not growing at all

+ Little mold growth

++ some mildew growth

+++ mold grows throughout food

Example 3

2 ml of 95% by volume of Japanese Pharmacy Defense Medicine was sealed in a small 2 cm x 2 cm bag composed of ethanol gas permeability 100 g / m 2/24 hours / 50% RH / 40 ° C. and a low density polyethylene film having a thickness of 20 μ. This is called a small pocket B. The sample is then made into rice and the three uncooked confections are stored with a small bag B in a 15 cm x 20 cm bag consisting of a composite film made of alumina with a polypropylene film (20 microns) and a polyethylene film (20 microns) wide spread. Use the other one as a control without a small bag of spirits. The above two materials were left under conditions of 28 ° C. and 82% relative humidity, and the growth state of the mold was observed daily for 60 days. As a result, the control group without the small sachets containing alcohol was found to grow mold after 6 days, but the small sachets B containing the 2 ml of alcohol were added to the control group for 60 days.

Example 4

The food preservation tool 5 used in this implementation which is a food preservation method is shown in FIG. 2A and FIG. 2B. Fig. 6 is an ethylene molbinyl acetate copolymer film (81 mol% ethylene, 19 mol% vinyl acetate) having a ethanol vapor permeability of 1000 g / m 2/24 hours of 50% relative humidity / 40 ° C and a thickness of 30 mu. This food preservation device (5) is a 6 cm x 10 cm bag and a 10 cm x 18 cm thin nonwoven fabric (8) deposited in 2 ml of 95% by volume ethanol in Japanese pharmacy room is folded into a suitable size and placed in the bag (6). Seal the inlet.

Thus the bag 6 is completely covered with the sealed part 7 and this is called D. 7 shows the sealed part.

The bag D, which is a food preservation device of the present invention, is stored in a cardboard alumina made of polyethylene, such as 450 g of sponge castella, and is referred to as (a). Thereafter, without adding pocket D, it is made to be in the same state as the other one. Separately, 450 g of sponge castella was stored in a bag made of ethanol gas permeability of 50 g / m 2/24 hours / 50% RH / 40 ° C. and a low density polyethylene film having a thickness of 50 μ, as in the bag D, and the inlet was sealed ( Is called. (A), (b) and (b) (b) Leave under conditions of 80% relative humidity at 25 ° C and observe the development of mold daily. The results are shown in Table 4.

The growth of mold in the pack after 24 days is thought to be a bad result because the box is blocking the aeration.

TABLE 4

-No growth of silver mold

+ Little mold growth

++ some mildew growth

+++ mold grows throughout food

Example 5

2.85 g of stearic acid is dissolved in 20 ml of ethanol (99.5%). When the resulting solution was hot and stirred, 5 ml of 2N-KOH ethanol solution was added to form an alcohol solution of potassium stearate. On the other hand, a 20 cm x 20 cm pouch is made of vinylidene chloride-coated polypropylene film and polyvinyl alcohol, and 5 ml of the warm carium stearate ethanol solution is filled.

The solution turns into a gel that is fluid as it is filled. The gel spreads widely across the front of the bag, forming a uniform layer. The inlet is then sealed to obtain a mixed sheet. The mixed sheet is folded with the polyvinyl alcohol film so that it is directly inside, and the remaining three places except the inlet are sealed.

This is called a storage bag. 10 rice cakes (approximately 50 g per piece) made in rice are put in the storage bag, and the inlet is sealed and referred to as sample A. On the other hand, 5 ml of ethanol is filled into a small bag made of a polyvinyl alcohol film of 30 mm x 30 mm. The sample was sealed by putting a small bag of ethanol and 10 rice cakes on the market in a laminated 10cm × 20cm bag made of polyvinylidene chloride coated polypropylene. do. Separately, a control sample without the use of a preservation bag or a small body temperature bag of alcohol is made. The samples are stored at 25 ° C. and 80% relative humidity, and their contents are observed daily to observe the growth of mold. The test results are shown in Table 5.

TABLE 5

Temperature: 25 ℃ Relative Humidity: 80%

-The fungus is not growing at all

+ Shows slight growth of mold

++ some mildew growth

+++ mold significantly grows

As shown in Table 5, control foods that were not exposed to ethyl alcohol vapor showed mold growth on day 4. In the test of Sample B, mold growth was seen on day 20 on the opposite side of which a small bag containing ethyl alcohol was placed. On the other hand, in the sample A using the storage bag in which the alcohol vapor is vaporized from the front of the bag, no mold growth was observed even after 30 days.

Example 6

8 g of gelatin is warmly dissolved in 50 ml of water, heated and stirred in hot state, and 50 ml of ethanol (99.5%) is added. On the other hand, a 50 mm × 100 mm small pouch in which 30 μl of ethylene vinyl acetate (copolymerized film of 81 mol% ethylene and 19 mol% vinyl acetate) was laminated on the outer shaft was prepared inside, and the gelatin alcohol aqueous solution described above was placed in the small pouch. Fill with 5ml when hot.

The filling liquid is spread out uniformly throughout, then cooled and sealed to obtain a mixed sheet. This mixed sheet is called a preservation bag.

Next, the storage bag and commercially available sponge cake (450 g) were placed in a 15 cm × 30 cm bag made of a laminated film composed of polyethylene and an outer vinylidene chloride-coated polypropylene. do. Separately, the same operation was carried out without using the storage bag as a control sample. The samples were stored at 25 ° C. and 80% relative humidity and their contents were observed daily to observe the growth of the fungus. As a result, the control structure sample without using the storage bag showed mold growth on day 8, while sample A using the storage bag did not show mold growth even after 40 days. The results are shown in Table 6.

TABLE 6

Temperature: 25 ℃ Relative Humidity: 80%

Claims (1)

Food preservation made by sealing a liquid containing more than 50% by volume of ethanol in a container composed of a film of 20g / m2 / 24hr / 50% RH / 40 ° C or more of ethanol gas permeability coexists with the food inside the food container. Preservation method of food.

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