JPH0367538A - Packaging body for red bream - Google Patents

Abstract

PURPOSE:To obtain the subject packaging body having excellent preserving properties of freshness and color of red bream with gas barrier properties by specifying oxygen concentration of atmosphere. CONSTITUTION:Synthetic resin having gas barrier properties such as high nitrile- based resin is made, e.g. to sheet by extrusion molding and to a vessel by vacuum forming. The vessel is charged with red bream and preserved in an atmosphere of <=20% oxygen concentration.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a package of fresh red sea bream,
Specifically, the present invention relates to a packaged body of golden sea bream that has excellent fish meat freshness and color retention.

[Conventional technology]

Traditionally, meat tends to lose its freshness, and many studies have been conducted to improve its shelf life.
No. 336 discloses a method of preventing deterioration and deterioration of meat quality by storing meat at low temperature in a substantially oxygen-impermeable container together with an oxygen scavenger. However, the red color of red fish meat fades in an atmosphere with low oxygen concentration, resulting in a decrease in commercial value.

In other words, it is not enough to prevent red fish meat from being altered by bacteria or from deteriorating its quality; it is also necessary to maintain its color. In JP-A-58-183033, the oxygen concentration was kept at 0.2 to 12%;
In Publication No. 8-107134, the oxygen concentration is 5 to 15.
A method is shown to preserve the red color of red meat by maintaining the However, these methods only have the effect of delaying the discoloration of red meat, and have not been able to extend the effect of preserving the quality of fish meat.

Furthermore, Japanese Patent Application Laid-open No. 158129/1983 discloses a method of restoring the faded red color by storing fish meat in a deoxidized state and then exposing it to the air. However, in the case of golden sea bream, it has been found through research by the present inventors that this method does not restore the faded color.

In other words, the problem of maintaining the color and freshness of fish meat in Kinmoku was unresolved.

[Problem to be solved by the invention]

An object of the present invention is to provide a package that maintains the color and freshness of golden sea bream, which has been impossible with conventional packaging methods.

[Means to solve the problem]

The inventors of the present invention have made extensive studies to solve this problem, and have solved this problem by using a storage container made of a gas barrier in a metal-grained packaging and an atmospheric gas mainly composed of oxygen gas. The present invention has finally been completed.

That is, the present invention is a packaged red sea bream characterized in that fresh red sea bream is stored in a container with excellent gas barrier properties in an atmosphere with an oxygen concentration of 20% or more.

There are no restrictions on the form of the fresh golden sea bream used in the present invention, but preferably fresh golden sea bream from which perishable parts such as the head, internal organs, and gills have been removed.

Examples of the synthetic resins having gas barrier properties used in the present invention include high nitrile resins, polycarbonate resins, ethylene-vinyl alcohol copolymers, polyester resins, and polyamide resins.

The high nitrile resin used in the present invention is a copolymer mainly composed of unsaturated nitrile such as acrylonitrile and methacrylaterile, and contains 50% by weight or more of unsaturated nitrile. Examples of monomers copolymerizable with unsaturated nitrile include styrene, butadiene, isoprene, methyl acrylate, ethyl acrylate, methyl methacrylate, and ethyl methacrylate, and one or more of these can be used.

In addition, mixtures of rubber-like polymers such as butadiene-acrylonitrile copolymers, isoprene-acrylonitrile copolymers, butadiene-styrene copolymers, polybutadiene, polyisoprene, etc. and copolymers mainly composed of unsaturated nitriles, and copolymers of these It is also possible to use a product obtained by graft polymerizing an unsaturated nitrile and the above copolymerizable monomer in the presence of a rubbery polymer.

The container of the present invention is manufactured by obtaining a sheet from the above-mentioned resin by a conventional extrusion molding method, calender molding method, inflatable blow molding method, etc., and then vacuum forming or pressure forming the sheet. High nitrile resin, polycarbonate resin and polyester resin have excellent heat sealability and can be used alone. The ethylene-vinyl alcohol copolymer needs to have a multilayer structure with other resins having excellent heat-sealing properties. When molding these sheets into a container shape, ethylene-vinyl alcohol copolymer, polycarbonate resin, and polyester resin have poor molding methods, and the core resin layer becomes partially thin, resulting in poor gas barrier properties of the container after molding. tends to drop, and this needs to be checked.

High nitrile resins are more preferred in terms of workability and yield.

The thickness of the container made of the synthetic resin with gas barrier properties used in the present invention is determined by the required gas barrier properties and rigidity.For example, in the case of high nitrile resin, the thickness is 0.1=0.8 m- If it is less than 0.1, the gas barrier properties and rigidity will be insufficient, and it is not preferable.On the other hand, if it exceeds 0.8', it may be good, but it will only result in poor workability and increase in cost. be.

Examples of the shape of the package used in the present invention include containers, bags, and the like.

The top film (lid) of the container in the present invention includes:
A single layer film of a high nitrile resin (polycarbonate resin or polyester resin), or a multilayer film obtained by laminating the above single layer film or an ethylene-vinyl alcohol copolymer film on a film made of another thermoplastic resin can be used.

The top film is sealed to the container body using the usual heat sealing method, impulse sealing method, etc.

The film can also be printed if desired to increase the commercial value of the package.

The atmospheric gas composition for preserving the Kinmedai used in the present invention is an atmosphere with an oxygen concentration of 20% or more, preferably an oxygen concentration of 50% or more. If the oxygen concentration is less than 20%, discoloration, fishy odor, and softening of the meat will occur.Inert gases such as nitrogen, carbon dioxide, helium, neon, argon, krypton, and xenon are preferred as mixed gas components other than M. used for.

[Effect]

An example of implementation of the present invention will be described based on the drawings.

1 and 2 are cross-sectional views of the package according to the present invention. The golden eye 111 is placed in a container 2 made of a synthetic resin with excellent gas barrier properties and a top film 3, or the fillet 4 of the golden sea bream is placed in a bag 5 made of a synthetic resin with excellent gas barrier properties, and the container is filled with 20% or more oxygen. By storing and sealing in an atmosphere, it is possible to prevent the flesh color and freshness of the golden sea bream from deteriorating.

〔Example〕

The present invention will be explained below using examples.

Production Example I A sheet with a thickness of 300 μm was obtained by extrusion molding using Valefux (trade name, manufactured by Mitsui Toatsu Kagaku ■) as a high nitrile resin. The obtained sheet was vacuum formed to a volume of 150
A 0 cc container was obtained.

Production Example 2 Using the same high nitrile resin as in Production Example 1, a film with a thickness of 40 μm was obtained by the inflation acid method.

Production Example 3 The film obtained in Production Example 2 was processed into a bag by a known method to obtain a bag with a capacity of 500 cc.

Example 1 Golden sea bream was placed in the container obtained in Production Example 1, heat-sealed with oxygen and the film obtained in Production Example 2, and heated at 2°C for 1 hour.
It was stored for 4 days. Sensory evaluations such as changes in flesh color, odor, and taste were conducted. The results are shown in Table 1.

Example 2 Example 1 was repeated except that a gas mixture of 20% oxygen and 80% nitrogen was used. The results are shown in Table 1.

Example 3 Fillets of golden sea bream were placed in the bag obtained in Production Example 3, and oxygen 5
It was heat-sealed with a gas mixture of 0% nitrogen, 30% and carbon dioxide, and stored at 2° C. for 14 days. The results are shown in Table 1.

Comparative Example 1 Example 1 was repeated except that a gas mixture of 10% oxygen and 90% nitrogen was used. The results are shown in Table 1.

Comparative Example 2 Example 1 was repeated except that no oxygen was used and sealing was performed with an oxygen scavenger. The results are shown in Table 1.Furthermore, when the golden sea bream whose color had faded during storage was left in the air, the flesh color did not recover.

Comparative Example 3 Example 1 was repeated except that a polyethylene container was used instead of the high nitrile resin container.

The results are shown in Table 1.

Comparative Example 4 Example 3 was repeated except that a polyethylene bag was used instead of the high nitrile resin bag. The results are shown in Table 1.

Comparative Example 5 Kinmedai was placed in a polystyrene paper molded tray, wrapped and stored at 2°C for 14 days.

The results are shown in Table 1.

Table 1 [Effects of the Invention] The gold-grained sea bream packaging of the present invention has extremely good flesh color retention and freshness retention properties, making it possible to store highly fresh red sea bream for a long period of time. This makes it possible to provide golden sea bream with excellent taste and freshness to consumers, which will greatly contribute to the distribution and sale of food products.

[Brief explanation of drawings]

FIGS. 1 and 2 are cross-sectional views showing an example of the package according to the present invention. In the figure = wire mesh 2: container 3 Nidotsubu film: wire mesh fillet 5: bag 6: heat-sealed part.

Claims (1)

[Claims] 1. Fresh golden sea bream in a container with excellent gas barrier properties,
A packaged golden sea bream characterized by being stored in an atmosphere with an oxygen concentration of 20% or more. 2. The golden sea bream package according to claim 1, wherein the container having excellent gas barrier properties is a container made of a high nitrile resin containing 50% or more of unsaturated nitrile monomer.