JPH10136878A - Antimicrobial sheet for preserving freshness of food - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain antimicrobial sheet which prevents the adhesion of bacteria and molds by laying this sheet on meats or wrapping the meats with this sheet and prevents the propagation of the bacteria by absorbing drips which are the cause for the propagation of the bacteria by impregnating a non-woven fabric consisting essentially of regenerated cellulose fibers with chitosan. SOLUTION: This antimicrobial sheet for preserving the freshness of food is obtd. by impregnating the non-woven fabric formed by intertwining the short fibers mainly composed of the regenerated cellulose fibers by jet water flow with chitosan, such as acetate, lactate and oxalate, having a deacetylation degree of >=30%, more preferably >=50%.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a nonwoven fabric sheet used for preserving foods, particularly meat. That is, the present invention is mainly spread on meat such as beef, pork, fish and the like,
It is a sheet that, when hung or rolled, prevents bacteria and "mold" from adhering and absorbs drip that causes the growth of these fungi, thereby preventing the growth of bacteria by antibacterial action.

[0002]

2. Description of the Related Art Conventionally, paper towels mainly composed of wood pulp and cellulosic nonwoven fabrics have been used as sheets for the above-mentioned purpose. May adhere to food, and bacteria adhere to the absorbed water and gravy, and grow.
On the contrary, there is a fatal disadvantage of contaminating food.

[0003] In order to impart antibacterial properties, a sheet may be impregnated with an antibacterial agent, but this sheet is directly in contact with food and must not be toxic to the human body. It must not pollute the environment. Accordingly, organic germicides such as benzalkonium chloride and chlorhexidine hydrochloride, which are often used for similar articles such as hand wipes, are toxic to the human body and are not environmentally friendly.

[0004]

SUMMARY OF THE INVENTION The present invention improves the above-mentioned drawbacks of the conventional sheet, has a wet strength,
Another object of the present invention is to obtain a water-absorbing sheet for foods having antibacterial properties. Further, the water-absorbing sheet is harmless to the human body and does not adversely affect the environment.

[0005]

The present invention is characterized in that a nonwoven fabric mainly composed of regenerated cellulose fibers is impregnated with chitosan.

As the regenerated cellulose fibers used in the present invention, fibers such as rayon and cupra are used, and short fibers having a fiber length of 5 to 30 mm are preferable. Other fibers, for example, short fibers of synthetic fibers such as polyester fibers may be mixed with the upper limit of 30% by weight.

[0007] The nonwoven fabric is preferably manufactured by using a jet stream to entangle short fibers without using a binder. The basis weight of the nonwoven fabric is 30 g / cm ^{2 to} 60 g / cm
² is preferred.

[0008] Chitosan is a substance obtained by deacetylating chitin obtained from shrimp and crab "Kora", and is usually used as a water-soluble salt of an inorganic or organic acid. In particular, acetate, lactate, and oxalate are preferred because they have no toxicity. Deacetylation degree is 30
%, Preferably 50% or more.

The above-mentioned chitosan is impregnated into a nonwoven fabric as an aqueous solution. Examples of the impregnation method include a method of immersing the nonwoven fabric in the above-mentioned aqueous solution of chitosan salt and squeezing, a method of spraying the aqueous solution of chitosan salt and the like. The amount of chitosan attached is 0.05 g / m
^{About 2 to} 0.5 g / m ² is preferable.

Next, the present invention will be further described with reference to examples.

[Example] Rayon short fiber (fiber length 10 to 30 mm) 8
0% by weight, polyester short fiber (fiber length 10 to 30 m
m) were mixed and the fibers were entangled with each other by a jet water stream to produce a nonwoven fabric (having a basis weight of 40 g / cm ² ).

On the other hand, chitosan (deacetylation degree of about 80
%) Of a lactic acid aqueous solution (concentration: 0.5%), and the above nonwoven fabric is immersed in the lactic acid solution, squeezed, dried, and applied to the fiber surface by 0.01%.
A coating of about 0.1 μm of chitosan salt was formed.

[0012] This non-woven fabric is used for Staphylococcus aureus, E. coli,
The antibacterial test performed on Vibrio parahaemolyticus and Salmonella by the shake flask method showed that the sterilization rate was almost 1
It was close to 00% and showed excellent antibacterial properties.

Incidentally, the shake flask method is as follows. 200ml Erlenmeyer flask 6 was prepared, suspension of the fungus 75 containing 10 ⁴ cells / ml of test bacteria to each
of the suspension, the number of viable bacteria (a) in the suspension is measured, and the result is defined as an average value A.

Next, three samples each of 0.75 ± 0.05 g of an untreated sample and a treated sample were prepared and added to an Erlenmeyer flask containing a suspension of the above bacterium.
Shake at 5 ± 5 ° C. and 320 rpm.

The viable cell count (b) of the shaken solution was measured, and the average was B, the sterilization rate of the test bacteria was determined by the following equation, and the effect was determined from each sterilization rate. (Refer to the processing effect evaluation test method for sanitary processed products by the Textile Sanitary Processing Council) Sterilization rate (%) = [(AB) / A] x 100

[0016]

[Effect] As described above, the antibacterial nonwoven fabric of the present invention has no toxicity, exhibits excellent antibacterial properties, and has high water absorption and wet strength, so that it can be used for foods, especially beef, pork, chicken, fish, etc. Hanging, laying, or rolling on fresh food has the effect of preventing bacteria from adhering and absorbing drip and the like generated from foods, thereby preventing the propagation of bacteria. Chitosan is a natural product and decomposes naturally, so it does not pollute the environment.

The antibacterial nonwoven fabric of the present invention has, besides the above-mentioned purposes, an antibacterial draining sheet after washing and boiling vegetables and various foods because of its high water absorption and high wet strength.
Of course, it is possible to use it as an antibacterial “Fukin” after washing dishes and as an antibacterial “Zoukin” on a table.

In particular, since the antibacterial nonwoven fabric of the present invention can be used in a microwave oven, it can be used for thawing or cooking using a microwave oven, and exhibits excellent effects.

Claims (4)

[Claims] An antibacterial sheet for preserving food by impregnating chitosan into a nonwoven fabric mainly composed of regenerated cellulose fibers. 2. The antibacterial sheet for preserving food according to claim 1, wherein the nonwoven fabric is obtained by entanglement of short fibers with a jet stream. 3. The antibacterial sheet for preserving food according to claim 1, wherein the chitosan has a degree of deacetylation of 50% or more and is an organic acid salt. 4. The antibacterial sheet for preserving food according to claim 1, wherein the chitosan is acetate, lactate or oxalate.