JPH02284645A - Disoxidant - Google Patents

Abstract

PURPOSE:To obtain a disoxidant not detectable with a metal detector by blending 1,2-glycol with an alkaline substance and a compd. of a transition metal. CONSTITUTION:A disoxidant is composed of 1,2-glycol such as ethylene glycol or propylene glycol, an alkaline substance such as NaOH or KOH and a compd. (e.g. halide or sulfate) of a transition metal such as iron or cobalt. Water and/or a slightly water soluble solid such as activated carbon or zeolite is further added as required. Since the highly hygroscopic glycol is used as a base and iron powder is not used, a metal detector for checking mixing with foreign matter can be worked without hindrance.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an oxygen scavenger. For more details, see 1.2-
This invention relates to a novel oxygen absorber containing glycol as a main ingredient. In this specification, the term "oxygen scavenger" is mainly used to mean a "composition that has an oxygen scavenging effect" (oxygen scavenger composition), but it also refers to a "package of a composition that has an oxygen scavenging effect" (oxygen scavenger composition). It is also sometimes used to mean an oxygen agent package.

[Conventional technology]

Some food preservation techniques use oxygen absorbers.
This is a gas-barrier sealed bag or container (hereinafter referred to as
Sometimes simply called a sealed container or container. ) By placing food, etc. and an oxygen scavenger inside the sealed system to create a substantially oxygen-free condition, it suppresses the oxidation of foods, etc. and the growth and proliferation of bacteria and mold. Used for preservation.

Conventionally, oxygen scavengers based on iron powder have been used for reasons such as their oxygen absorption ability, ease of handling, safety, and cost.

By the way, in the case of packaged foods, for example, after the food is sealed in a packaging bag, it is passed through a metal detector to check for foreign matter contamination.

However, since oxygen absorbers based on iron powder are naturally detected by metal detectors, metal detectors cannot be applied to packaged foods that contain oxygen absorbers.

[Problem to be solved by the invention]

In view of the above-mentioned problems of the prior art, an object of the present invention is to provide an oxygen scavenger that will not be detected even when applied to a metal detector.

[Means to solve the problem]

A means for solving the above problems is to use a composition of 1-92 glycol, an alkaline substance, and a transition metal compound as an oxygen scavenger.

Aspects of the solution include (1) 1,2-glycol;
Oxygen scavenger consisting of an alkaline substance and a transition metal compound, (20,2-oxygen scavenger consisting of glycol, alkaline substance, transition metal compound, and water, (3) 1.2 glycol, alkaline substance, transition metal compound, and poorly water-soluble Oxygen scavengers made of solids, and (4) oxygen scavengers made of 1,2-glycol, alkaline substances, transition metal compounds, poorly water-soluble solids, and water.

In the above solution, the 1,2-glycol may be a commercially available one, may contain impurities such as water, or may be a mixture. As the 1,2 glycol, for example, ethylene glycol, propylene glycol, etc. are preferable, and propylene glycol is particularly preferable.

In addition, alkaline substances include substances that exhibit alkalinity by acting with or dissolving in water, such as hydroxides, carbonates, hydrogen carbonates, and tertiary phosphates of alkali metals or alkaline earth metals. Diphosphates and the like are preferred, and alkali metal and alkaline earth metal hydroxides are particularly preferred. Specifically, for example, sodium hydroxide, sodium carbonate, sodium bicarbonate, tribasic phosphate,
Sothorium phosphate, potassium hydroxide, potassium carbonate,
Potassium hydrogen carbonate, potassium triphosphate, potassium diphosphate, calcium hydroxide, magnesium hydroxide, and the like are preferred. Among these, thorium hydroxide, potassium hydroxide, calcium hydroxide, etc. are particularly preferable (...).Alkaline substances can be used alone or in combination of two or more types. The amount is preferably 10 parts or more, more preferably 30 to 1.000 parts, based on 100 parts (parts by weight, the same applies hereinafter) of 1.2-glycol.

If the amount of the alkaline substance mixed is less than the above range, the amount of oxygen absorbed by the composition will be small, which is undesirable.If the amount of the alkaline substance mixed is more than the above range, the amount of oxygen absorbed per unit weight will be small. The packaging material for packaging the composition needs to be large, which causes problems in loading the food package and is also unfavorable in terms of appearance.

Examples of the transition metal compound include -X transition metal halides, sulfates, nitrates, phosphates, carbonates, organic acid salts, oxides, hydroxides, other double salts, and chelate compounds. As the transition metal, iron, cobalt, nickel, copper, zinc, manganese, etc. are used, and copper, iron, manganese, etc. are preferable (-<, considering safety, iron is the most preferable).
7. Most preferred specific examples include ferrous chloride, ferric chloride, ferrous sulfate, ferric sulfate, ferrous hydroxide, ferric hydroxide, ferrous citrate, ferrous tartrate, and ferric tartrate. Examples include inorganic or organic iron compounds such as iron. These transition metal compounds are added singly or in combination of two or more and act as catalysts in the composition of the present invention, and the amount thereof is preferably 1 part or more per 100 parts of 1,2-glycol. Parts or more are particularly preferred.

Slightly water-soluble solids are solid substances that are insoluble or sparingly soluble in water, and specifically include activated carbon, zeolite, perlite, diatomaceous earth, activated clay, silica, kaolin, talc, bentonite, activated alumina, gypsum, and silica. Examples include powders or granules of alumina, calcium silicate, magnesium oxide, graphite, carbon black, aluminum hydroxide, iron oxide, and the like. The poorly water-soluble solids may be used alone or in combination of two or more, if necessary. By incorporating a poorly water-soluble solid, it is possible to increase the oxygen absorption rate or the amount of oxygen absorption, and to simplify the handling of the composition.

Furthermore, by incorporating a poorly water-soluble solid, the contact area of the liquid component in the composition with oxygen can be increased. The amount of the poorly water-soluble solid to be blended is appropriately selected in relation to other components, and is not particularly limited, but is 0.1 to 10 parts per 100 parts of glycerin.
．． 000 parts is preferred, and 1 to 1.000 parts is particularly preferred.

In the present invention, there are no particular restrictions on the method of mixing the above-mentioned components, but if the components are liquid or powder, any method that allows each component to be mixed uniformly may be used; if granules are used as the component, for example, A method may be adopted in which the liquid is impregnated into the granular material and then the powder is added so as to be sprinkled thereon. Each of the above components is usually housed in an air-permeable packaging material to form a package. As for the packaging method, for example, after mixing each component, it can be wrapped in a pouch sealed by heat-sealing the periphery of an air-permeable packaging material using a backing machine to form an oxygen absorber package.

This oxygen absorber package can be used to preserve foods, etc. by storing the oxygen absorber package together with foods, etc. in an air-impermeable packaging material and sealing it, or by storing it together with foods, etc. in an airtight container and sealing it.

[Effect]

When the oxygen absorber of the present invention does not contain water in its composition, it can be applied to foods with a relatively high moisture content, and the oxygen absorber of the present invention can be of a type that absorbs oxygen by incorporating moisture that evaporates from the food into the composition. I can do it. In particular, 1.2 glycols such as ethylene glycol and propylene glycol have extremely strong hygroscopic properties, and therefore perform a good deoxidizing function in an atmosphere with a high rate of water evaporation.

In this case, the advantage is that it is easy to handle until it is sealed together with food. Furthermore, if water is added to the composition, it can be used as an oxygen absorber that removes oxygen regardless of the water content of the food.

〔Example〕

Examples 1 to 4 After mixing the oxygen scavenger components shown in Table 1, a small bag (
50 mm long and 80 mm wide) to form an oxygen absorber package. This oxygen absorber package was aired at 500rn1. At the same time, the bag was placed in a bag made by laminating polyvinylidene chloride-coated stretched nylon and polyethylene, and after being sealed, the bag was left in an atmosphere at 25°C. After 6 days, the oxygen concentration in the bag was measured and the amount of oxygen absorbed was determined. The results are shown in Table 1.

Note that in Examples 1 and 3, absorbent cotton impregnated with water was sealed together and the tests were carried out at a relative humidity of 100%.

Example 5 The same procedure as in Example 1 was carried out except that 5 g of propylene glycol, 5 g of calcium hydroxide, 1 g of manganese chloride, 5 g of activated carbon, and 5 g of water were mixed and used as an oxygen scavenger.

Two days later, when I measured the oxygen concentration inside the bag, it was 0.
．． It was less than 1%. The amount of oxygen absorbed at this time was LOW.

Example 6 The same procedure as in Example 1 was carried out except that 5 g of ethylene glycol, 5 g of calcium hydroxide, 1 g of ferrous chloride, 5 g of activated carbon and 5 g of water were mixed and used as an oxygen scavenger.

Two days later, when I measured the oxygen concentration inside the bag, it was 0.
．． It was less than 1%. The amount of oxygen absorbed at this time is 103 m1
．． Met.

Example 7 After raising 400 adult black elephants in 1 kg of brown rice for one week, the adults were removed. The remaining brown rice was divided into 20 g portions and used for the following samples.

20 g of brown rice as a sample and the oxygen scavenger package of Example 5 were placed in a bag made by laminating polyvinylidene chloride coated stretched nylon and polyethylene, and the bag was sealed so that the amount of air in the bag was 500 d. Ten identical specimens were prepared and stored in a thermostatic chamber at 20°C. After storing it for 20 days, it was opened and placed indoors at 25°C, and the number of brown elephants emerging from the sample brown rice was recorded.

As a control, the same test as above was conducted except that the oxygen absorber package was not enclosed in the bag. In this case, the number of brown elephants emerging was taken as 100%.

The results are shown in Table 2.

Example 8], five 5g manju buns and the oxygen absorber package of Example 6 were placed in a bag made of polyvinylidene chloride coated stretched nylon-tang polyethylene laminated, and the air volume in the bag was 500 m
It was stored sealed at 20°C as shown in A. 1 week later,
The oxygen concentration and carbon dioxide concentration in the bag were measured, and the properties of the manju were observed.

As a control, the same test as above was conducted except that the oxygen absorber package was not enclosed in the bag.

The results are shown in Table 3.

〔Effect of the invention〕

Since the oxygen scavenger of the present invention does not use iron powder, it will not be detected even if it is placed in a metal detector after being sealed together with food, making it possible to test food for foreign matter contamination. In addition, since it uses 2-glycol as its main ingredient, it is highly safe in terms of ingredients.
There is no possibility of releasing toxic gas during the reaction.

Procedural amendment June 6, 1999

Claims (8)

[Claims] (1) An oxygen scavenger consisting of 1,2-glycol, an alkaline substance and a transition metal compound. (2) An oxygen scavenger consisting of 1,2-glycol, an alkaline substance, a transition metal compound, and water. (3) An oxygen scavenger consisting of 1,2-glycol, an alkaline substance, a transition metal compound, and a poorly water-soluble solid. (4) An oxygen scavenger consisting of 1,2-glycol, an alkaline substance, a transition metal compound, a poorly water-soluble solid, and water. (5) The oxygen scavenger according to any one of claims 1 to 4, wherein the 1,2-glycol is ethylene glycol. (6) The oxygen scavenger according to any one of claims 1 to 4, wherein the 1,2-glycol is propylene glycol. (7) An oxygen absorber package comprising the oxygen absorber according to any one of claims 1 to 6 housed in an air-permeable packaging material. (8) A food package obtained by storing the oxygen absorber package according to claim 7 and a food in an air-impermeable packaging material or an airtight container and sealing or sealing the package.