JPH0662729A - Method for thermal sterilization of fungal mushrooms - Google Patents

Abstract

PURPOSE:To obtain fungal mushrooms good in keeping performance without deteriorating the appearance by hermetically sealing the fungal mushrooms together with a deoxidizer package and heating the hermetically sealed package. CONSTITUTION:The method for thermal sterilization is to hermetically seal fungal mushrooms, together with a deoxidizer package prepared by packaging a deoxidizer with a packaging material at least partially composed of an air- permeable sheet, in a packaging material having oxygen barrier properties and then heat the resultant hermetically sealed package at >=80 deg.C. Although fresh fungal mushrooms such as SHIITAKE mushroom, Lyophyllum aggregatum Kuhner and Flammulina velutipes Sing. are preferred as the fungal mushrooms, dried SHIITAKE mushrooms, dried Flammulina velutipes Sing., etc., reconstituted with water may be used. The fungal mushrooms are thermally sterilized in the absence of oxygen as described above to perform the action on preventing browning caused by oxidation of the fungal mushrooms. Thereby, the fungal mushrooms, good in appearance and excellent in keeping quality can be obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to, for example, shiitake mushrooms, shimeji mushrooms,
The present invention relates to a heat sterilization method for improving the preservability of fungi such as enoki mushrooms.

[0002]

2. Description of the Related Art Mushroom mushrooms such as shiitake mushrooms, shimeji mushrooms, and enoki mushrooms have been increasing in production and consumption with the spread of artificial cultivation, and are widely used as various cooking materials. The distribution form of fresh fungi mushrooms is generally, for example, a net package of shiitake mushrooms, a sealed package of polyethylene bags of shiitake mushrooms and enoki mushrooms, a package of plastic trays of shimeji mushrooms and a wrap film, and the like. In addition, dried shiitake mushrooms, dried enoki mushrooms and the like are used as fungi mushrooms having a preservation ability.

[0003]

[Problems to be Solved by the Invention] As a result of artificial cultivation, fresh fungi have come to be sold at any time. The fresh fungi mushrooms packaged in the above-mentioned conventional distribution form have poor storability because the fresh fungi mushrooms are generally sensitive to changes in temperature and humidity. Even in such cases, the product is sold out on the day in principle, and it is considered to be a product that is difficult to handle for dealers and other dealers.

Further, dried shiitake mushrooms, dried mushrooms and the like, which have good preservability, require complicated operations because they require reconstitution with water during cooking, and the flavor obtained by cooking is different from that of fresh fungi mushrooms. Have problems such as completely different.

On the other hand, the present invention provides a heat sterilization method which can obtain fungi and mushrooms having good appearance and good storage performance.

[0006]

According to the invention of claim 1, an oxygen barrier property is provided for a fungi mushroom together with an oxygen absorber package in which an oxygen absorber is packaged in a packaging material at least a part of which is a breathable sheet. The method comprises heat-sterilizing mushrooms and mushrooms which are sealed with the packaging material they have and then heated to 80 ° C or higher.

According to a second aspect of the present invention, in the structure of the first aspect, the breathable sheet comprises a breathable sheet made of a knitted, woven or non-woven fabric and water-impermeable and oxygen-permeable fine pore groups. A method of heat sterilizing fungi with a composite sheet having a plastic film attached thereto.

In the method of heat sterilizing fungi of the present invention having the above-mentioned constitution, as the fungi which are subjected to heat sterilization, fresh fungi such as shiitake, shimeji mushrooms and enoki mushrooms are preferable.
The dried shiitake mushroom or dried mushroom may be rehydrated.

The oxygen scavenger package, which is sealed with fungi and mushrooms in a packaging material having an oxygen barrier property, is a package in which the oxygen scavenger is packaged in a packaging material at least a part of which is a breathable sheet. A package made of packaging material that has both damage resistance and hygiene and safety is preferable. For example, as a breathable sheet forming at least part of the packaging material, a composite in which a breathable sheet made of knitted, woven or non-woven fabric and a plastic film having water-impermeable and oxygen-permeable fine pore groups are attached. It is preferable to use the sheet such that the surface of the plastic film having the water-impermeable and oxygen-permeable fine pore groups in the composite sheet is the outer peripheral surface of the package. In such an oxygen absorber package, the oxygen absorber in the package does not leak to the outside, and since the water attached to the fungi does not wet the oxygen absorber, the oxygen absorber It is possible to effectively use the deoxidizing ability of the. The breathable sheet made of knitted, woven or non-woven fabric is preferably made of synthetic fiber, and the plastic film having water-impermeable and oxygen-permeable fine pore groups is, for example, a polyolefin resin film. It is preferable that a group of micropores having a diameter of about 0.01 to 50 μm be formed by a hot needle or the like on the hydrophobic plastic film such as.

The breathable sheet used as at least a part of the packaging material of the oxygen absorber package has, for example, a Gurley type air permeability of 0.01 to 10000 sec / 100.
It may be about ml.

The oxygen scavenger in the oxygen scavenger package may be any solid as long as it has a function of absorbing oxygen, such as powder, for example, sulfite, bisulfite, and dithionite. , Ferrous salt, hydroquinone, catechol,
Resorcin, pyrogallol, gallic acid, rongalit,
Deoxidizer containing ascorbic acid and / or its salt, isoascorbic acid and / or its salt, sorbose, glucose, ligulin, dibutylhydroxytoluene, butylhydroxyanisole, etc., and deoxidizer containing metal powder such as iron powder. Agent is used. Of these, an oxygen scavenger containing ascorbic acid and / or its salt, isoascorbic acid and / or its salt, or iron powder is preferable.

A laminated sheet having a gas barrier layer is used as a packaging material having an oxygen barrier property for sealing the fungi and the oxygen absorber packaging. The gas barrier layer may be, for example, polyvinylidene chloride coated stretched nylon film,
Polyvinylidene chloride coated stretched polyethylene terephthalate film, Polyvinylidene chloride coated stretched polypropylene film, Ethylene-vinyl alcohol copolymer film, Polyvinylidene chloride film, Aluminum foil, Aluminum vapor deposited plastic film, SiO _x
It may be formed of a vapor-deposited plastic film, a SnO _x vapor-deposited plastic film, an AlO _x vapor-deposited plastic film, or the like.

The specific constitution of the packaging material having an oxygen barrier property is, for example, in the case where the packaging material is a type such as a pouch or a lid material, for example, [stretched polyethylene terephthalate film / polyvinylidene chloride coated stretched nylon film / unstretched film]. Polypropylene film], [Polyvinylidene chloride coated stretched polyethylene terephthalate film /
Stretched nylon film / polyethylene film], [stretched polyethylene terephthalate film / polyvinylidene chloride film / unstretched polypropylene film],
[Polyvinylidene chloride coated stretched nylon film / polyethylene film], [Polyvinylidene chloride coated stretched polypropylene film / unstretched polypropylene film], [Stretched polyethylene terephthalate film /
A laminated sheet of aluminum foil / unstretched polypropylene film] or the like is used.

When the packaging material is a tray type, [polypropylene layer / ethylene-vinyl alcohol copolymer layer / polypropylene layer], [polypropylene layer / polyvinylidene chloride layer / polypropylene layer], [polypropylene layer / aluminum]. Foil / polypropylene layer],
[Polypropylene layer / Nylon layer / Polyvinylidene chloride layer / Polypropylene layer], [Polypropylene layer / Nylon layer / Ethylene-vinyl alcohol copolymer layer / Polypropylene layer], [Polypropylene layer / Nylon layer / Aluminum foil / Polypropylene layer], etc. A laminated sheet according to

A sealed package body in which a deoxidizer package body in which at least a part of an oxygen absorber is packaged with a breathable sheet and fungi and fungi are sealed with a packaging material having an oxygen barrier property is heat-sterilized. Heat treatment is performed at a temperature of 80 ° C or higher for 5
It is preferable to perform the treatment for about 200 minutes.

[0016]

According to the present invention, fungi mushrooms are sealed with a packaging material having an oxygen barrier property together with an oxygen absorber packaging body in which an oxygen absorber is packaged in at least a part of a breathable sheet. It is a method of heat sterilization of fungi mushrooms that heats a sealed package to 80 ° C or higher. By heat sterilizing fungi mushrooms in the absence of oxygen, the action of preventing browning due to oxidation of fungi mushrooms is achieved. Will be fulfilled.

Therefore, according to the method of heat sterilizing fungi of the present invention, fungi having a good appearance and good storability can be obtained.

[0018]

EXAMPLES The specific constitution of the method for heat sterilizing fungi of the present invention will be described below based on Examples.

[Example 1] Eight fresh shiitake mushrooms washed with running water were placed on a polypropylene tray [length 270 mm, width 18].
0 mm, depth 20 mm] and arranged in parallel in two rows, and then placed on a commercially available oxygen absorber packaging [Mitsubishi Gas Chemical Co., Ltd.].
: Ageless FX-200] and a pouch made of a packaging material having an oxygen barrier property [length 300 mm, width 2]
00 mm]. The pouch is a laminated film composed of [stretched nylon film (15μ) / polyvinylidene chloride film (15μ) / stretched nylon film (15μ) / unstretched polypropylene film (60μ)] The bag is made so that the inner surface is formed.

Subsequently, the pouch containing the fresh shiitake mushroom and the oxygen absorber package was sterilized by a hot water retort sterilizer at 90 ° C., 1.0 kg / cm ² , for 30 minutes.

[Example 2] 150 g of fresh shimeji mushrooms that had been cut and removed and then washed with running water were used as [polypropylene layer (90 µ) / ethylene-vinyl alcohol copolymer layer (15 µ) / polypropylene layer (90 µ)). ] A tray formed by molding a laminated sheet [length 150 mm, width 100
mm, depth 20 mm], and then a commercially available oxygen absorber packaging [Mitsubishi Gas Chemical Co., Ltd .: Ageless FX]
-100], and a packaging material having an oxygen barrier property is further applied to the open mouth of the tray, and the packaging material is heat-bonded to the open mouth of the tray. A hermetically sealed package made of a packaging material having oxygen barrier properties in which and are encapsulated is obtained.

The packaging material having an oxygen barrier property covering the opening of the tray is [stretched nylon film (15μ) / polyvinylidene chloride film (15μ) /
A stretched nylon film (15μ) / unstretched polypropylene film (60μ)],
The unstretched polypropylene film surface of the laminated film faced the inside of the tray and was heat-bonded to the opening of the tray.

Subsequently, the hermetically sealed package in which the fresh shimeji mushroom and the oxygen absorber package are enclosed is subjected to a sterilization treatment at 90 ° C., 1.0 kg / cm ² , and 30 minutes by a hot water retort sterilizer. did.

[Comparative Example 1] The pouch containing fresh shiitake mushrooms was sterilized in the same manner as in Example 1 except that the oxygen absorber package was not used. Attached.

[Example 2] The sealed package of fresh shimeji mushrooms was sterilized in the same manner as in Example 2 except that the oxygen absorber package was not used. .

[Experiment] The above-mentioned Examples 1 and 2 and Comparative Example 1
~ 10 sealed packages of fungi and mushrooms that have been sterilized by
The cells were stored in an atmosphere of ° C, and during the course of storage, the number of general viable bacteria attached per 1 g of fungi (unit: Ke / g) and the appearance of the fungi were observed. The results are shown in [Table 1].

[0027]

[Table 1]

[0028]

[Effect] According to the method of heat sterilization of fungi of the present invention, even preservatives of fresh fungi can be preserved easily, which makes it easy for distributors and consumers to handle. , Greatly contributes to the industry and has a great effect.

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Claims (2)

[Claims] 1. A fungi mushroom is sealed with a packaging material having an oxygen barrier property together with an oxygen absorber packaging body in which an oxygen absorber is packaged in a packaging material at least a part of which is a breathable sheet. A method for heat-sterilizing fungi and mushrooms, which comprises heating to above ℃. 2. The breathable sheet comprises a composite sheet obtained by sticking a breathable sheet made of knitted, woven or non-woven fabric and a plastic film having water-impermeable and oxygen-permeable fine pore groups. Item 1. A method of heat sterilization of fungi and mushrooms according to Item 1.