Deoxidizer composition and deoxidizer package

Abstract

A deoxidizer composition comprising iron powder (A), alkali metal halide or alkaline earth metal halide (B), activated carbon (C), and inorganic powder filler (D), wherein the inorganic powder filler (D) is a substance other than iron powder (A), alkali metal halide or alkaline earth metal halide (B), and activated carbon (C), and the apparent density of the inorganic powder filler (D) is 1.10 g / cm³. 3 Above and 2.90 g / cm 3 In the following cases, the content of inorganic powder filler (D) is 50 to 300 parts by weight relative to 100 parts by weight of iron powder (A).

Description

Technical Field

[0001] This invention relates to deoxidizer compositions and deoxidizer packaging. Background Technology

[0002] Previously, deoxidizers utilizing the oxidation reaction of iron powder (hereinafter referred to as iron-based deoxidizers) were proposed. Commercially available deoxidizers (e.g., brand name "AGELESS", manufactured by Mitsubishi Gas Chemical Co., Ltd.) are sealed together with food, pharmaceuticals, and other items in gas-barrier containers to remove oxygen from the container, thereby maintaining the quality and freshness of these items.

[0003] As iron-based deoxidizers, there are "moisture-dependent" deoxidizers that utilize oxygen absorption starting from moisture evaporated from the stored material, and "spontaneous reaction" deoxidizers that have moisture required for the oxygen absorption reaction of iron pre-contained in the deoxidizer composition.

[0004] In particular, "water-dependent" oxygen absorbers are used in foods with high water content, such as rice cakes and raw noodles. Furthermore, recently, oxygen absorbers for foods with high water activity, such as rice intended for long-term storage, have been developed and are being marketed.

[0005] For example, Patent Document 1 discloses a cooked rice packaging material with microwave resistance, which is formed by storing cooked rice with a specific range of viable bacteria count and pH along with a microwave-resistant oxygen absorber packaging material in a container with low oxygen permeability and then sealing it. It should be noted that Patent Document 1 may list oxygen absorbers with any one of ascorbic acid or its salts, isoascorbic acid or its salts, or iron powder as the main agent.

[0006] Existing technical documents

[0007] Patent documents

[0008] Patent Document 1: Japanese Patent Application Publication No. 02-128663 Summary of the Invention

[0009] The problem the invention aims to solve

[0010] As mentioned above, "moisture-dependent" oxygen absorbers utilize the moisture evaporated from the food being preserved to absorb oxygen, making foods with high water activity suitable for preservation. However, rice cakes and rice contain a lot of water, causing the oxygen absorber packaging to become wet and preventing it from fully utilizing its oxygen absorption capacity.

[0011] Therefore, there is a need for an oxygen absorber and an oxygen absorber packaging that can maintain oxygen absorption capacity even in a water-wet environment, such as for foods with high water activity containing a large amount of moisture.

[0012] Therefore, the objective of this invention is to provide an oxygen absorber composition that can absorb oxygen for a long period of time, even when applied to foods with high water activity.

[0013] Solution for solving the problem

[0014] That is, the main structure of the present invention is as follows.

[0015] [1] A deoxidizer composition comprising iron powder (A), alkali metal halide or alkaline earth metal halide (B), activated carbon (C), and inorganic powder filler (D), wherein the inorganic powder filler (D) is a substance other than iron powder (A), alkali metal halide or alkaline earth metal halide (B), and activated carbon (C), and the apparent density of the inorganic powder filler (D) is 1.10 g / cm³. 3 Above and 2.90 g / cm 3 In the following cases, the content of inorganic powder filler (D) is 50 to 300 parts by weight relative to 100 parts by weight of iron powder (A).

[0016] [2] According to the deoxidizer composition described in [1] above, wherein the inorganic powder filler (D) contains at least one selected from the group consisting of metal salts, elemental metals and metal oxides.

[0017] [3] According to the deoxidizer composition described in [1] or [2] above, wherein the inorganic powder filler (D) is a metal carbonate.

[0018] [4] The deoxidizer composition according to any one of [1] to [3] above, wherein the inorganic powder filler (D) is calcium carbonate.

[0019] [5] The deoxidizer composition according to any one of [1] to [4] above, wherein the inorganic powder filler (D) is at least one selected from the group consisting of heavy calcium carbonate, crushed seashells, calcite, marble, limestone and precipitated calcium carbonate.

[0020] [6] The deoxidizer composition according to any one of [1] to [5] above, wherein the average particle size of the inorganic powder filler (D) is 10 to 500 μm.

[0021] [7] The deoxidizer composition according to any one of [1] to [6] above, wherein the apparent density of the inorganic powder filler (D) is 1.10 g / cm³. 3 Above and 1.50 g / cm 3 the following.

[0022] [8] The deoxidizer composition according to any one of [1] to [7] above, wherein the content of inorganic powder filler (D) is 105 to 200 parts by mass relative to 100 parts by mass of iron powder (A).

[0023] [9] The deoxidizer composition according to any one of [1] to [8] above, wherein the alkali metal halide or alkaline earth metal halide (B) is an alkaline earth metal halide.

[0024]

[10] The deoxidizer composition according to any one of [1] to [9] above, wherein the alkali metal halide or alkaline earth metal halide (B) is at least one selected from the group consisting of calcium chloride, magnesium chloride, magnesium bromide and calcium bromide.

[0025]

[11] The deoxidizer composition according to any one of [1] to

[10] above, wherein the content of activated carbon (C) is 0.5 to 5.0 parts by mass relative to 100 parts by mass of iron powder (A).

[0026]

[12] The deoxidizer composition according to any one of [1] to

[11] above, wherein the content of alkali metal halide or alkaline earth metal halide (B) is 0.3 to 5.0 parts by mass relative to 100 parts by mass of iron powder (A).

[0027]

[13] The deoxidizer composition according to any one of [1] to

[12] above, wherein the content of alkali metal halide or alkaline earth metal halide (B) is 1.1 to 3.0 parts by mass relative to 100 parts by mass of iron powder (A).

[0028]

[14] An oxygen absorber packaging body comprising the oxygen absorber composition described in any one of [1] to

[13] above and a breathable packaging material containing the oxygen absorber composition.

[0029]

[15] A method for preserving a food with high water activity, wherein the deoxidizer composition described in any one of [1] to

[13] above or the deoxidizer packaging body described in

[14] above is sealed with the food with high water activity in a gas barrier container for preservation.

[0030]

[16] A high water activity food packaging body, which is formed by sealing the deoxidizer composition described in any one of [1] to

[13] above or the deoxidizer packaging body described in

[14] above with the high water activity food in a gas barrier container.

[0031] The effects of the invention

[0032] According to the present invention, an oxygen absorber composition capable of long-term oxygen absorption even when applied to foods with high water activity can be provided. Furthermore, according to the present invention, an oxygen absorber packaging, a method for preserving foods with high water activity, and a packaging for foods with high water activity can also be provided. Detailed Implementation

[0033] Hereinafter, embodiments of the oxygen scavenger composition, the oxygen scavenger package, the method for preserving high water activity food, and the high water activity food package of the present invention are described in detail.

[0034] It should be noted that in the present specification, the term "A to B" in relation to the description of numerical values means "not less than A and not more than B" (when A < B) or "not more than A and not less than B" (when A > B). In addition, in the present invention, a combination of preferred embodiments is a more preferred embodiment.

[0035] [Oxygen Scavenger Composition]

[0036] The oxygen scavenger composition of the present invention contains iron powder (A), an alkali metal halide or alkaline earth metal halide (B), activated carbon (C) and an inorganic powder filler (D), wherein the inorganic powder filler (D) is a substance other than the iron powder (A), the alkali metal halide or alkaline earth metal halide (B), and the activated carbon (C), and the apparent density of the inorganic powder filler (D) is 1.10 g / cm 3 or more and 2.90 g / cm 3 or less, and the content of the inorganic powder filler (D) is 50 to 300 parts by mass relative to 100 parts by mass of the iron powder (A).

[0037] With the aforementioned configuration, the oxygen scavenger composition of the present invention can absorb oxygen for a long period of time even when applied to high water activity foods.

[0038] The reason why the oxygen scavenger composition of the present invention exerts the above effects is not certain, but one of the reasons is considered to be as follows.

[0039] It is considered that the inorganic powder filler having an apparent density within a specific range does not excessively retain the moisture evaporated from the food, and can retain moisture moderately. Accordingly, it is considered that the inhibition of the oxidation reaction caused by excessive moisture can be suppressed, and moisture capable of promoting the oxidation reaction can be supplied, so that oxygen can be absorbed even in the coexistence of a high water activity food. Further, it is considered that the halide and the activated carbon can supply moisture to the surface of the iron powder by deliquescence, adsorption and desorption, so that the oxidation reaction can be promoted and sustained.

[0040] As described above, it is considered that the oxygen scavenger composition of the present invention, by having the aforementioned configuration, can absorb oxygen for a long period of time even when applied to high water activity foods.

[0041] Hereinafter, each component and the like will be described.

[0042] <Iron Powder (A)>

[0043] The oxygen scavenger composition of the present invention contains iron powder. The iron powder contained in the oxygen scavenger composition of the present invention is referred to as "iron powder (A)" (component A).

[0044] Iron powder (A) in the deoxidizer composition of the present invention is the main agent of the deoxidation reaction.

[0045] As for the iron powder (A), there is no particular limitation, but iron powder with exposed iron (metallic iron with zero valence) is preferred. It can also have an extremely thin oxide coating, similar to a normal metal surface, without hindering the effects of the present invention. Specifically, reduced iron powder, electrolytic iron powder, sprayed iron powder (atomized iron powder), etc., are preferred. Additionally, pulverized or diced materials such as cast iron can also be used.

[0046] Iron powder (A) can be used alone or in combination with two or more types as needed. Furthermore, commercially available iron powders are readily available and can be used.

[0047] From the viewpoint of ensuring good contact with oxygen, the average particle size (D50) of the iron powder (A) is, for example, 3000 μm or less, preferably 1000 μm or less, more preferably 500 μm or less, and even more preferably 300 μm or less. Furthermore, from the viewpoint of suppressing dust generation, it is preferably 1 μm or more, more preferably 10 μm or more, and even more preferably 20 μm or more. Specifically, the average particle size (D50) of the iron powder (A) is, for example, 1 to 3000 μm, preferably 1 to 1000 μm, more preferably 10 to 500 μm, and even more preferably 20 to 300 μm.

[0048] It should be noted that iron powder with an average particle size within the above-mentioned range can be appropriately selected and commercially available iron powder can be obtained. Alternatively, it can be obtained by grading using a sieve corresponding to the desired average particle size.

[0049] The average particle size of the iron powder (A) can be determined by the method described in the examples.

[0050] Furthermore, from the viewpoint of oxygen absorption performance, the specific surface area of ​​iron powder (A) is preferably 0.02 m². 2 / g or more, more preferably 0.03m 2 / g or more, and from the viewpoint of suppressing dust generation, 0.40m is preferred. 2 / g or less, more preferably 0.15m 2 / g or less, more preferably 0.10m 2 / g or less, more preferably 0.07m 2 / g or less, more preferably 0.045m 2 The specific surface area of ​​iron powder (A) is preferably 0.02 to 0.40 m² / g or less. 2 / g, more preferably 0.03~0.15m 2 / g, more preferably 0.03~0.10m 2 / g, more preferably 0.03~0.07m 2 / g, more preferably 0.03~0.045m 2 / g.

[0051] It should be noted that the specific surface area of ​​iron powder (A) can be determined by the method described in the examples.

[0052] The content of iron powder (A) is not particularly limited, but in the deoxidizer composition, it is preferably 15% by mass or more and 75% by mass or less, more preferably 20% by mass or more and 60% by mass or less, and even more preferably 25% by mass or more and 50% by mass or less.

[0053] <Alkali metal halides or alkaline earth metal halides (B)>

[0054] The deoxidizer composition of the present invention contains alkali metal halides or alkaline earth metal halides. The alkali metal halides or alkaline earth metal halides contained in the deoxidizer composition of the present invention are referred to as "alkali metal halides or alkaline earth metal halides (B)" (component B), and are also referred to as "halides (B)".

[0055] The alkali metal halide or alkaline earth metal halide (B) in the deoxidizer composition of the present invention catalyzes the oxidation reaction of iron powder, thus enhancing the activity of the iron powder. Furthermore, the alkali metal halide or alkaline earth metal halide (B) prevents the water contained in the deoxidizer composition from evaporating and being lost from the composition, thereby inhibiting the transfer of moisture to the preserved material.

[0056] The halide (B) contained in the deoxidizer composition is preferably present on the surface of the iron powder, and more preferably contained in the deoxidizer composition as a halide coating the iron powder. By having the halide (B) present on the surface of the iron powder, moisture can be easily introduced to the surface of the iron by utilizing the deliquescence of the halide (B), thereby improving the oxygen absorption performance.

[0057] The halide (B) is not particularly limited, and can be an alkali metal halide or an alkaline earth metal halide, preferably an alkaline earth metal halide.

[0058] As an alkali metal halide, it is preferably at least one selected from the group consisting of alkali metal chlorides, bromides and iodides, more preferably at least one selected from the group consisting of alkali metal chlorides and bromides, and even more preferably a chloride.

[0059] From the perspectives of processability and safety, the alkali metal halide is preferably selected from at least one of the group consisting of sodium chloride, potassium chloride, potassium bromide and sodium bromide, more preferably from at least one of the group consisting of sodium chloride and potassium chloride, and even more preferably sodium chloride.

[0060] The halide of an alkaline earth metal is preferably at least one selected from the group consisting of chlorides, bromides and iodides of alkaline earth metals, more preferably at least one selected from the group consisting of chlorides and bromides of alkaline earth metals, and even more preferably a chloride.

[0061] From the perspectives of processability and safety, the alkaline earth metal halide is preferably selected from at least one of the group consisting of calcium chloride, magnesium chloride, magnesium bromide and calcium bromide, more preferably selected from at least one of the group consisting of calcium chloride and magnesium chloride, and even more preferably calcium chloride.

[0062] Halide (B) can be used alone or in combination of two or more as needed. Furthermore, commercially available products of the halide (B) described above are readily available and can also be used.

[0063] The content of halide (B) relative to 100 parts by weight of iron powder (A) is preferably 0.3 to 5.0 parts by weight, more preferably 0.4 to 4.0 parts by weight, even more preferably 0.5 to 3.0 parts by weight, even more preferably 1.0 to 3.0 parts by weight, even more preferably 1.1 to 3.0 parts by weight, even more preferably 1.1 to 2.5 parts by weight, and even more preferably 1.1 to 2.0 parts by weight. By setting the content of halide (B) within the above range, moisture can be adequately supplied to the iron powder, or it can function as a reaction promoter, thus maintaining high oxygen absorption performance for a long time even when coexisting with foods with high water activity.

[0064] <Activated Carbon (C)>

[0065] The deoxidizer composition of the present invention contains activated carbon. The activated carbon contained in the deoxidizer composition of the present invention is referred to as "activated carbon (C)" (component C).

[0066] The activated carbon (C) in the deoxidizer composition of the present invention functions as a reaction promoter and a water-retaining carrier.

[0067] There are no particular limitations on the activated carbon (C), and there are no restrictions on the types of raw materials, such as wood, coconut shell, and coal. From the viewpoint of using the deoxidizer composition of the present invention for food, it is preferable to select one or more of wood and coconut shell.

[0068] In addition, the properties of activated carbon (C) are not particularly limited. From the viewpoint of processability during the manufacture of the deoxidizer composition, it is preferable to use granular or powdered activated carbon with high flowability, and more preferably activated carbon with a shape close to spherical.

[0069] Activated carbon (C) can be used alone or in combination of two or more types as needed. Furthermore, commercially available activated carbons are readily available and can also be used.

[0070] Furthermore, regarding the average particle size of activated carbon (C), from the viewpoint of processability during the manufacture of the deoxidizer composition, powdered activated carbon is preferably 0.1 μm or more and 1000 μm or less, more preferably 1 μm or more and 100 μm or less, and even more preferably 1 μm or more and 50 μm or less. As long as the activated carbon particles have a particle size within the above-mentioned range, it can be used regardless of whether it is primary granules, aggregated granules, or granulated material. Activated carbon with a particle size within the above-mentioned range can be used alone, or multiple types with different particle sizes can be mixed in any proportion. Such activated carbon is readily available commercially and can be used.

[0071] The content of activated carbon (C) relative to 100 parts by weight of iron powder (A) is preferably 0.5 to 5.0 parts by weight, more preferably 0.5 to 4.0 parts by weight, even more preferably 0.5 to 3.0 parts by weight, even more preferably 0.5 to 2.5 parts by weight, even more preferably 0.5 to 2.0 parts by weight, even more preferably 0.5 to 1.8 parts by weight, even more preferably 0.5 to 1.7 parts by weight, and even more preferably 0.5 to 1.5 parts by weight. By maintaining the content of activated carbon (C) within the above range, moisture can be retained for a long time, thus functioning as a reaction promoter, and maintaining high oxygen absorption performance for a long time even when coexisting with foods with high water activity.

[0072] The content of activated carbon (C) relative to 100 parts by weight of the deoxidizer composition is preferably 0.2 to 3.0 parts by weight, more preferably 0.2 to 2.0 parts by weight, even more preferably 0.2 to 1.5 parts by weight, even more preferably 0.2 to 1.2 parts by weight, even more preferably 0.2 to 1.0 parts by weight, even more preferably 0.2 to 0.8 parts by weight, even more preferably 0.2 to 0.7 parts by weight, and even more preferably 0.2 to 0.6 parts by weight. By maintaining the activated carbon (C) content within the above range, moisture can be retained for a long time, thus functioning as a reaction promoter, and maintaining high oxygen absorption performance for a long time even when coexisting with foods with high water activity.

[0073] <Inorganic Powder Filler (D)>

[0074] The deoxidizer composition of the present invention contains an apparent density of 1.10 g / cm³. 3 Above and 2.90 g / cm 3 The following inorganic powder filler. The aforementioned inorganic powder filler contained in the deoxidizer composition of the present invention is referred to as "inorganic powder filler (D)" (component D).

[0075] It should be noted that the inorganic powder filler (D) is an inorganic powder other than iron powder (A), alkali metal halides or alkaline earth metal halides (B), and activated carbon (C) mentioned above. That is, the inorganic powder filler (D) is an inorganic powder that does not contain any of the following: iron powder (A), alkali metal halides or alkaline earth metal halides (B), and activated carbon (C).

[0076] In addition, the content of inorganic powder filler (D) in the deoxidizer composition is 50 to 300 parts by mass relative to 100 parts by mass of iron powder (A).

[0077] The apparent density of the inorganic powder filler (D) is 1.10 g / cm³. 3 Above and 2.90 g / cm 3 The apparent density of the inorganic powder filler (D) is preferably 1.10 g / cm³. 3 Above and 2.50 g / cm 3 The following is more preferably 1.10 g / cm³ 3 Above and 2.10 g / cm 3 The following is a further preferred value of 1.10 g / cm³. 3 Above and 1.90 g / cm 3 The following is a further preferred value: 1.10 g / cm³ 3 Above and 1.80 g / cm 3 The following is a further preferred value: 1.10 g / cm³ 3 Above and 1.50 g / cm 3 The following is a further preferred value: 1.10 g / cm³ 3 Above and 1.40 g / cm 3 The following is a further preferred value: 1.20 g / cm³ 3 Above and 1.40 g / cm 3 The following is a further preferred value: 1.25 g / cm³ 3 Above and 1.35g / cm 3 The following applies. By making the apparent density of the inorganic powder filler (D) within the above-mentioned range, it is possible to suppress the hindrance of oxidation reaction caused by excessive moisture, and even when the deoxidizer composition is applied to foods with high water activity, it can absorb oxygen for a long time.

[0078] The content of inorganic powder filler (D) in the deoxidizer composition is 50 to 300 parts by weight relative to 100 parts by weight of iron powder (A). Preferably, the content of inorganic powder filler (D) in the deoxidizer composition is 60 to 300 parts by weight relative to 100 parts by weight of iron powder (A), more preferably 80 to 300 parts by weight, further preferably 100 to 300 parts by weight, even more preferably 100 to 250 parts by weight, even more preferably 105 to 200 parts by weight, even more preferably 120 to 180 parts by weight, and even more preferably 140 to 160 parts by weight. By setting the content of inorganic powder filler (D) within the above range, the hindrance to oxidation reaction caused by excess moisture can be suppressed, and oxygen can be absorbed for a long time even when the deoxidizer composition is applied to foods with high water activity.

[0079] The content of inorganic powder filler (D) in the deoxidizer composition is preferably 10 to 100 parts by weight relative to 100 parts by weight of the deoxidizer composition. More preferably, the content of inorganic powder filler (D) in the deoxidizer composition is 20 to 100 parts by weight relative to 100 parts by weight; even more preferably, 30 to 100 parts by weight; even more preferably, 35 to 100 parts by weight; even more preferably, 35 to 80 parts by weight; even more preferably, 40 to 70 parts by weight; even more preferably, 45 to 70 parts by weight; and even more preferably, 50 to 65 parts by weight. By setting the content of inorganic powder filler (D) within the above range, the hindrance to oxidation reactions caused by excess moisture can be suppressed, and oxygen can be absorbed for a long time even when the deoxidizer composition is applied to foods with high water activity.

[0080] The inorganic powder filler (D) is not limited in type as long as it is a powdery inorganic material with the above-mentioned apparent density, but preferably contains at least one selected from the group consisting of metal salts, elemental metals, and metal oxides. Metal salts, elemental metals, and metal oxides are all preferred as the inorganic powder filler (D). Since metal oxides may introduce moisture into the system through a small amount of hydroxyl groups present on their surface, metal salts or elemental metals are more preferred. Therefore, the inorganic powder filler (D) preferably contains at least one selected from the group consisting of metal salts, elemental metals, and metal oxides, more preferably contains at least one selected from the group consisting of metal salts and elemental metals, and even more preferably contains a metal salt.

[0081] The inorganic powder filler (D) is more preferably selected from at least one of the group consisting of metal salts, elemental metals, and metal oxides. Metal salts, elemental metals, and metal oxides are all preferred as inorganic powder filler (D), and since metal oxides have the potential to introduce moisture into the system through a small amount of hydroxyl groups present on their surface, metal salts or elemental metals are even more preferred. Therefore, the inorganic powder filler (D) is more preferably selected from at least one of the group consisting of metal salts, elemental metals, and metal oxides, more preferably selected from at least one of the group consisting of metal salts and elemental metals, and even more preferably a metal salt. By using metal salts, elemental metals, or metal oxides as inorganic powder fillers, the inhibition of oxidation reactions can be suppressed even in the presence of excessive moisture, and oxygen can be absorbed for a long time even when the deoxidizer composition is applied to foods with high water activity. It is believed that even if the filler has difficulty absorbing water, or even in the presence of excessive moisture, the inhibition of oxidation reactions caused by wetting of the deoxidizer composition can be prevented.

[0082] As a metal salt, it is preferably at least one metal salt selected from the group consisting of metal carbonates, phosphates, nitrates, nitrites, borates, thiocyanates and organic acid salts, and more preferably a metal carbonate.

[0083] The metal in the metal salt is preferably selected from at least one of the group consisting of alkaline earth metals, transition metals, alkali metals and aluminum, more preferably an alkaline earth metal, and even more preferably calcium.

[0084] Therefore, as a metal salt, at least one metal salt selected from the group consisting of carbonates, phosphates, nitrates, nitrites, borates, thiocyanates, and organic acid salts of alkaline earth metals is more preferred, alkaline earth metal carbonates are even more preferred, and calcium carbonate is even more preferred. By using calcium carbonate as an inorganic powder filler, the inhibition of oxidation reactions can be suppressed, and oxygen can be absorbed for a long time even when the deoxidizer composition is applied to foods with high water activity. It is believed that even if calcium carbonate has difficulty absorbing water, or even if there is excessive moisture, the inhibition of oxidation reactions caused by wetting of the deoxidizer composition can be prevented.

[0085] As a metallic element, it is preferably selected from at least one element chosen from the group consisting of Group 4, Group 5, Group 6, Group 7, Group 9, Group 10, Group 11, Group 12 and Group 13 elements, more preferably a Group 11 element, and even more preferably copper.

[0086] The metal in the metal oxide is preferably at least one element selected from the group consisting of elements from Group 4, Group 5, Group 6, Group 7, Group 9, Group 10, Group 11, Group 12 and Group 13, more preferably a Group 11 element, and even more preferably copper.

[0087] Therefore, as a metal oxide, it is more preferably an oxide of at least one metal selected from the group consisting of elements of Group 4, Group 5, Group 6, Group 7, Group 9, Group 10, Group 11, Group 12 and Group 13, more preferably an oxide of a Group 11 element, and even more preferably copper oxide.

[0088] As such a specific inorganic powder filler (D), it is preferably at least one selected from the group consisting of carbonates of alkaline earth metals, elemental substances of Group 11 elements and oxides of Group 11 elements, more preferably at least one selected from the group consisting of calcium carbonate, copper and copper oxide, even more preferably at least one selected from the group consisting of calcium carbonate and copper, and even more preferably calcium carbonate.

[0089] As described above, the inorganic powder filler (D) is preferably a metal salt, more preferably a metal carbonate, even more preferably an alkaline earth metal carbonate, and even more preferably calcium carbonate.

[0090] When the inorganic powder filler (D) is calcium carbonate, the inorganic powder filler (D) is preferably selected from at least one of the group consisting of heavy calcium carbonate, crushed seashells, calcite, marble, limestone, and precipitated calcium carbonate, and more preferably from at least one of the group consisting of marble and limestone. By using marble or limestone as the inorganic powder filler, the inhibition of oxidation reaction can be suppressed, and oxygen can be absorbed for a long time even when the deoxidizer composition is applied to foods with high water activity. It is believed that this can prevent the inhibition of oxidation reaction caused by wetting of the deoxidizer composition, even if marble or limestone has difficulty absorbing water, or even if there is excessive moisture.

[0091] Examples of marble include Arabescato, Sivec White, White Peony, Bianco Carrara, and Perlino Chiaro, with Sivec White being the most preferred.

[0092] Examples of limestone include Bailong crushed stone, with Bailong crushed stone being the preferred choice.

[0093] The average particle size of the inorganic powder filler (D) is preferably 10-500 μm, more preferably 20-500 μm, even more preferably 30-500 μm, even more preferably 40-500 μm, and even more preferably 50-450 μm. By making the average particle size of the inorganic powder filler (D) within the above range, the inhibition of the oxidation reaction is suppressed, and oxygen can be absorbed for a long time even when the deoxidizer composition is applied to foods with high water activity. It is believed that even if the filler with an average particle size within the above range has difficulty retaining water and therefore has excessive moisture, the inhibition of the oxidation reaction caused by the wetting of the deoxidizer composition can be prevented. The average particle size of the inorganic powder filler (D) is the average particle size (D50) of the cumulative frequency in the volume-based particle size distribution. More specifically, the average particle size of the inorganic powder filler (D) is determined by the method described in the examples.

[0094] <Other Ingredients>

[0095] In addition to the above-mentioned components, the deoxidizer composition of the present invention may contain other components as needed, without impairing the effects of the present invention. Examples of such other components include flow improvers, catalysts, odor adsorbents, and heat dispersants.

[0096] <Method for manufacturing deoxidizer composition>

[0097] The method for manufacturing the deoxidizer composition of the present invention is not particularly limited, but preferably includes the step of mixing iron powder (A), alkali metal halide or alkaline earth metal halide (B), activated carbon (C) and inorganic powder filler (D).

[0098] To enable iron to absorb oxygen, moisture needs to be introduced onto the iron surface, which utilizes the deliquescence of metal salts. The halide (B) is preferably contained in the deoxidizer composition in the form of an aqueous solution dissolved in water.

[0099] The above mixing process can be (1) a process of mixing all the components together, (2) a process of preparing an aqueous solution obtained by dissolving the halide (B) in water, adding the above aqueous solution to a mixture obtained by mixing iron powder (A), activated carbon (C) and inorganic powder filler (D), and mixing and drying, or (3) a process of preparing an aqueous solution obtained by dissolving the halide (B) in water, adding the above aqueous solution to iron powder (A), mixing and drying, obtaining halide-coated iron powder, and further mixing activated carbon (C) and inorganic powder filler (D).

[0100] According to the process described in (3) above, moisture is easily introduced to the surface of iron due to the deliquescence of the halide (B), which can improve the oxygen absorption performance. Therefore, the process described in (3) above is more preferred.

[0101] There are no particular limitations on the mixing method; it can be carried out by vibration mixing, mixing using a mixing device, etc. Specific examples of mixing devices include the Notta mixer (manufactured by HOSOKAWA MICRON CORPORATION), the cone mixer (manufactured by Ohno Chemical Machinery Co., Ltd.), the vertical granulator (manufactured by Powrex Corporation), the high-speed mixer (manufactured by EARTHTECHNICA CO., LTD.), and the granulator (manufactured by Akira Kiko Co., Ltd.).

[0102] Iron, as the main component of the deoxidizer, reacts with oxygen, and therefore the reaction proceeds slowly during the manufacture of the deoxidizer composition. Therefore, mixing is preferably carried out in an inert atmosphere (in the case of a substantially closed system, typically an atmosphere of an inert gas (e.g., nitrogen) without oxygen), and appropriate deheating is preferred.

[0103] [Oxygen absorber packaging]

[0104] The deoxidizer packaging of the present invention comprises the above-described deoxidizer composition and a breathable packaging material containing the deoxidizer composition.

[0105] (Breathable packaging materials)

[0106] There are no particular restrictions on the type of packaging material as long as it is a container that allows oxygen to pass through. From the perspective of containing the above-mentioned deoxidizer composition and using it with the preserved items, especially foods with high water activity, the preferred form is a bag or pouch.

[0107] Examples of breathable packaging materials include: a bag-shaped breathable packaging material made by laminating two breathable films together; a bag-shaped breathable packaging material made by laminating one breathable film with one non-breathable film together; and a bag-shaped breathable packaging material made by bending one breathable film and sealing the edges (excluding the bent portion) together.

[0108] Alternatively, a bag can be made by laminating two non-breathable films together, and then inserting a breathable material, such as a sheet with a breathable cross-section, into the laminated portion to make it breathable. Compared to breathable packaging materials made of breathable films, breathable packaging materials obtained by inserting breathable materials into non-breathable films can inhibit excessive moisture intrusion, and are therefore preferred.

[0109] The aforementioned breathable film can be a single-layer film formed from one breathable material or a laminated film formed from two or more breathable materials. From the perspective of enabling oxygen to pass through efficiently, preventing leakage of the deoxidizer composition, and thus moderately inhibiting the intrusion of moisture, a laminated film is preferred.

[0110] In the laminated film, a preferred laminated film is one having an outer layer formed of a thermoplastic resin, an intermediate layer formed of paper, aluminum foil, or a thermoplastic resin, and an inner layer formed of a heat-sealable thermoplastic resin. Here, the outer layer is located on the outside of the oxygen absorber packaging and is in contact with external gases and the stored product; the inner layer is located on the inside of the oxygen absorber packaging and is in contact with the oxygen absorber composition; and the intermediate layer is located between the outer and inner layers.

[0111] The outer layer is preferably formed of a thermoplastic resin, more preferably of polyethylene terephthalate or biaxially oriented polypropylene. Furthermore, in order to fuse and laminate with the intermediate layer via heat sealing, the outer layer is preferably a two-layer film. Examples of thermoplastic resins used in layers other than polyethylene terephthalate or biaxially oriented polypropylene include low-density polyethylene, medium-density polyethylene, high-density polyethylene, linear low-density polyethylene, ethylene-vinyl acetate copolymer, ionomer resin, ethylene-acrylic acid copolymer, ethylene-ethyl acrylate copolymer, ethylene-methacrylic acid copolymer, ethylene-α-olefin copolymer, ethylene-methyl methacrylate copolymer, ethylene-propylene copolymer, methylpentene polymer, polybutene polymer, acid-modified polyolefin resin, polyvinyl acetate resin, poly(meth)acrylic acid resin, and polyvinyl chloride resin, with low-density polyethylene being preferred. It should be noted that the outer layer has multiple openings due to perforation processing.

[0112] The intermediate layer is preferably formed of paper, aluminum foil or thermoplastic resin, more preferably of paper or thermoplastic resin.

[0113] As for paper, examples include hydrophobic paper, kraft paper, premium paper (Yokashi), and washi paper.

[0114] The thermoplastic resin used in the intermediate layer is preferably a nonwoven fabric, such as linear (linear) low-density polyethylene (LLDPE) nonwoven fabric, polyethylene terephthalate (PET) nonwoven fabric, composite nonwoven fabric (PET-PE sheath core structure, etc.), TYVEK (registered trademark, manufactured by DuPont-Asahi Flash Spun Products Co., Ltd.), etc.

[0115] Aluminum foil has multiple openings through a perforation process.

[0116] The inner layer is preferably formed of a heat-sealable thermoplastic resin, more preferably of linear low-density polyethylene or unstretched polypropylene. It should be noted that the inner layer has multiple openings through a perforation process.

[0117] The air permeability of the breathable packaging material, measured by a Gellert air permeability meter, is preferably less than 1000 seconds / 100cc, more preferably less than 100 seconds / 100cc, and even more preferably less than 30 seconds / 100cc.

[0118] Furthermore, the thickness of the laminated film is preferably 30 μm or more and 300 μm or less, more preferably 40 μm or more and 250 μm or less. In this case, compared with cases where the thickness deviates from the above range, it is possible to produce a packaging material that maintains strength and has excellent heat-sealing properties and packaging adaptability.

[0119] In the case of a breathable packaging material obtained by laminating two non-breathable films together to form a bag-like material, and then sandwiching a breathable sheet into the laminated portion of the material, a three-layer structure as described above can be provided, or a sealing layer can be provided between each layer. Alternatively, a bag-like material can be formed by laminating the outer edge of a laminate formed of a non-breathable film, a sealing layer, a breathable sheet, and a sealing layer.

[0120] The material of the aforementioned non-breathable film is preferably selected from one of the group consisting of polyethylene terephthalate, polyamide, polypropylene, polycarbonate and cellophane.

[0121] The material of the sheet with the aforementioned breathable cross-section is preferably paper or nonwoven fabric. As paper, it is preferably at least one selected from the group consisting of washi paper, rayon-blend washi paper, and yoga paper; from the viewpoint of adhesion, rayon-blend washi paper is more preferred. As nonwoven fabric, examples include wet-laid nonwoven fabric, dry-laid nonwoven fabric, and spunbond nonwoven fabric. As materials for nonwoven fabric, examples include polyamide, polyethylene terephthalate, and rayon.

[0122] The materials used for the aforementioned sealing layer include polyethylene, polyethylene vinyl acetate copolymer, ionomer, polybutadiene, and vinyl chloride.

[0123] [Preservation methods and packaging for high water activity foods]

[0124] The above-mentioned oxygen absorber composition and oxygen absorber packaging can absorb oxygen for a long time even if the preserved food has a high water activity, and are therefore suitable for the preservation of high water activity foods.

[0125] Therefore, the method for preserving high water activity food of the present invention is a method for preserving high water activity food by sealing the above-mentioned deoxidizer composition or the above-mentioned deoxidizer packaging and the high water activity food in a gas-barrier container and storing them. The method for preserving high water activity food by sealing the above-mentioned deoxidizer composition or the above-mentioned deoxidizer packaging and the high water activity food in a gas-barrier container and storing them is also included in the present invention.

[0126] Furthermore, the high water activity food packaging of the present invention is a high water activity food packaging formed by sealing the above-mentioned deoxidizer composition or the above-mentioned deoxidizer packaging and high water activity food into a gas-barrier container. The high water activity food packaging formed by sealing the above-mentioned deoxidizer composition or the above-mentioned deoxidizer packaging and high water activity food into a gas-barrier container is also included in the present invention.

[0127] There are no restrictions on the preservation method of the high water activity food of the present invention and the high water activity food used in the packaging body of the high water activity food. The effects of the present invention can be clearly achieved by using food with a water activity of 0.7 or higher.

[0128] Therefore, the water activity of the aforementioned high water activity food is preferably 0.7 or higher, more preferably 0.8 or higher, and even more preferably 0.9 or higher. By using the above-mentioned oxygen absorber composition and oxygen absorber packaging, oxygen can be absorbed for a long time when used to preserve food with a water activity of 0.7 or higher.

[0129] The water content in the aforementioned high water activity food is preferably 30% by mass or more, more preferably 40% by mass or more, and even more preferably 50% by mass or more. The upper limit of the water content in the aforementioned high water activity food is generally 70% by mass or less. By using the aforementioned oxygen absorber composition and oxygen absorber packaging, oxygen can be absorbed for a long period when used to preserve food with a water content of 30% by mass or more.

[0130] Specific examples of the aforementioned high water activity foods include rice, rice cakes, glutinous rice balls, raw noodles, raw breadcrumbs, steamed buns, and bread, with rice and rice cakes being preferred. By using the aforementioned oxygen absorber composition and oxygen absorber packaging, oxygen can be absorbed for a long time even when stored with foods with extremely high water activity, such as rice and rice cakes.

[0131] As for the gas-barrier container used in the preservation method of high water activity food and the packaging body of high water activity food of the present invention, there is no particular limitation as long as it can be sealed and has substantial gas barrier properties. From the viewpoint of blocking external air permeability, it is preferable to make it of a non-permeable material.

[0132] Specifically, bags and packaging containers with a laminated structure, such as polyethylene terephthalate / aluminum vapor-deposited / polyethylene, stretched polypropylene / polyvinyl alcohol / polyethylene, polyvinylidene chloride coated stretched nylon / polyethylene, etc., or nylon-based co-extruded multilayer sheets or films with an oxygen permeability of 0.05~20mL / (m²), can be easily used. 2 It consists of a laminated body with a 24hr·atm (25℃, 50%RH) temperature.

[0133] In addition to the above, metal cans, glass bottles, plastic containers, etc., can also be used as gas-barrier containers.

[0134] The embodiments of the present invention have been described above, but the present invention is not limited to the above embodiments, including all the concepts of the present invention and all the ways contained in the claims, and various changes can be made within the scope of the present invention.

[0135] Example

[0136] Hereinafter, this embodiment will be described in detail using examples and comparative examples, but this embodiment can be appropriately modified as long as the effect of the present invention is achieved.

[0137] <Materials>

[0138] The following shows the materials used in the embodiments and comparative examples.

[0139] Iron powder: "JIP303-60A", manufactured by JFE Steel Corporation, average particle size 41μm, specific surface area 0.037m². 2 / g

[0140] • Activated carbon: "A3", manufactured by Osaka Gas Chemicals Co., Ltd., in powder form.

[0141] ·Calcium chloride: manufactured by Tokuyama Co., Ltd.

[0142] Average particle size of iron powder

[0143] Regarding the average particle size of the iron powder mentioned above, the average particle size (D50) at 50% cumulative frequency was determined using a standard sieve according to ISO 3310-1:2000 (equivalent to JIS Z8801-1:2006) based on the weight fraction of the sieve aperture size after vibrating it for 5 minutes.

[0144] [Specific surface area of ​​iron powder]

[0145] The specific surface area of ​​the above iron powder (unit: m²) 2 / g) Determined according to JIS Z8830:2013, based on the BET multi-point method.

[0146] <Inorganic Powder Fillers>

[0147] The materials used as inorganic powder fillers in the examples and comparative examples are as follows.

[0148] • Cold Water Stone: "Cold Water #50", manufactured by Nitto Powdered Chemical Industry Co., Ltd., marble, calcium carbonate, average particle size 71.1μm, apparent density 1.29g / cm³ 3

[0149] • Hakuryu Crushed Stone: "Hakuryu Ichiri", manufactured by Asahi Minerals Co., Ltd., limestone, calcium carbonate, average particle size 312μm, apparent density 1.27g / cm³ 3

[0150] • Copper: “Copper, powder”, manufactured by Fujifilm and Koko Pure Chemical Industries, Ltd., average particle size 19.2 μm, apparent density 2.02 g / cm³ 3

[0151] • Copper oxide: "Copper oxide (II)", manufactured by Fujifilm and Koko Pure Chemical Industries, Ltd., average particle size 15.7 μm, apparent density 1.90 g / cm³ 3

[0152] • Alumina: “Alumina A14”, manufactured by Nippon Light Metal Holdings Co., Ltd., average particle size 55 μm, apparent density 0.76 g / cm³ 3

[0153] • Silica sand: "Northeast Silica Sand No. 8", manufactured by Northeast Silica Sand Co., Ltd., average particle size 120μm, apparent density 1.03g / cm³ 3

[0154] • Yellow iron oxide: “MTY-80”, manufactured by Kanto Denka Finetech Co., Ltd., iron hydroxyl oxide (FeOOH), average particle size 4.7 μm, apparent density 0.34 g / cm³ 3

[0155] Magnesium carbonate: "Heavy magnesium carbonate", manufactured by Tomita Pharmaceutical Co., Ltd., average particle size 8.5 μm, apparent density 0.36 g / cm³ 3

[0156] • Zinc: "Zinc, powder", manufactured by Fujifilm and Koko Pure Chemical Industries, Ltd., average particle size 4.6 μm, apparent density 3.09 g / cm³ 3

[0157] Average particle size of inorganic powder fillers

[0158] The average particle size of the inorganic powder filler was determined by a particle size distribution measuring device (MICROTRAC "CAMSIZAR"), measuring the average particle size (D50) of the cumulative frequency in the volume reference particle size distribution.

[0159] The determination was performed twice under the following conditions, and the average value was taken as the average particle size of the inorganic powder filler.

[0160] Refractive index: 1.45

[0161] Solvent: Methyl ethyl ketone

[0162] Shape: Non-spherical

[0163] [Apparent density of inorganic powder fillers]

[0164] According to JIS K6720-2:1999, the inorganic powder filler is placed in a 100mL container, and its mass is determined to calculate the mass.

[0165] <Manufacturing of Oxygen Deoxidizer Compositions and Oxygen Deoxidizer Packaging>

[0166] Example 1

[0167] [1] Manufacturing of deoxidizer compositions

[0168] A 10% calcium chloride aqueous solution was prepared by dissolving calcium chloride, an alkaline earth metal halide, in water.

[0169] Next, 100 parts by weight of iron powder and the above calcium chloride aqueous solution are mixed in such a way that the calcium chloride is converted to 1.25 parts by weight, and then dried to prepare calcium chloride coated iron powder.

[0170] The calcium chloride-coated iron powder (101.25 parts by weight), activated carbon (1.5 parts by weight), and gypsum (150 parts by weight) as an inorganic powder filler were mixed to obtain a deoxidizer composition.

[0171] [2] Manufacturing of deoxidizer packaging

[0172] A polyethylene film is laminated onto a polyethylene terephthalate (PET) film, and perforation is performed to obtain a breathable film (impermeability 0-500 seconds, measured using the Göllley method (JIS-P8117). A digital Okinawa-type air permeability tester (manufactured by Asahi Seiko Co., Ltd.) is used). The polyethylene film side of the breathable film is overlapped without adhering to the water-resistant paper side of a breathable sheet made of porous polyethylene laminated on water-resistant paper as a sealing layer, to obtain a double packaging material. The sealing layer side of the breathable sheet of this double packaging material is overlapped with the sealing layer of a separately prepared non-breathable film made of polyethylene film laminated on a polyethylene terephthalate (PET) film as a sealing layer, and heat-sealed on three sides to obtain a single-sided double packaging bag with one side open. 3.5g of the above-mentioned deoxidizer composition is filled between the breathable sheet and the non-breathable film through the opening of the single-sided double packaging bag, and the opening is sealed to obtain a deoxidizer package (size: 45mm × 50mm).

[0173] Examples 2-4 and Comparative Examples 1-5

[0174] The calcite used as an inorganic powder filler was replaced with the filler shown in Table 1. Otherwise, the deoxidizer composition and deoxidizer packaging were manufactured in the same manner as in Example 1.

[0175] <Residual Oxygen Absorption Performance>

[0176] The residual oxygen absorption performance was evaluated using the deoxidizer compositions and deoxidizer packaging obtained in the examples and comparative examples.

[0177] Place the oxygen absorber package (3.5g of oxygen absorber composition) into an oxygen barrier bag (220mm×300mm, oxygen permeability 0.53mL / (m²)). 2 For oxygen concentrations below 24 h (MPa) (Mocon method, 20℃, 65% RH), add 1000 mL of air with 100% RH to the oxygen barrier bag, seal it, and store it at 25℃. After confirming that the oxygen concentration in the oxygen barrier bag is below 0.1%, remove the oxygen absorber package. Then, use a hammer to tap the oxygen absorber package to crush the oxygen absorber composition contained in the package until there are no lumps. Then, open the oxygen absorber package and place the oxygen absorber composition on filter paper.

[0178] Add water dropwise until the oxygen absorber composition on the filter paper is completely wetted. After adding water, let it stand for 60 minutes, then spread the oxygen absorber composition onto a cotton cloth (80 μm thick) to a depth of 100 cm. 2 The area is covered by a cotton cloth placed on top, and the mixture is pressed for 10 minutes to remove moisture, ensuring the original material does not fully contact the cotton cloth. The moisture content of the resulting deoxidizer composition after moisture removal is calculated using the following formula and is taken as the saturated moisture content.

[0179] (Saturated moisture content (%) = [(Mass of the deoxidizer composition after moisture removal) - (Mass of the deoxidizer composition before water addition)] / (Mass of the deoxidizer composition after moisture removal) × 100

[0180] Using the obtained deoxidizer composition after moisture removal, deoxidizer packaging bodies were manufactured by the same method as in Example 1 above.

[0181] The oxygen absorber package was placed in an oxygen barrier bag, and then 3000 mL of air with 100% RH was added to the bag. After sealing, the bag was stored at 25°C for 3 days, and the amount of oxygen in the bag after 3 days was measured. The reduction in oxygen amount was taken as the residual oxygen absorption performance. The greater the reduction in oxygen amount, the better the residual oxygen absorption performance, indicating that the bag can absorb oxygen even in the presence of large amounts of moisture, making it the preferred option.

[0182] The oxygen content in the oxygen barrier bag was measured using a gas analyzer (MOCON "Check Mate 3"). The measurement was performed as follows: the hollow needle at the tip of the sampling silicone tube attached to the gas analyzer was inserted into the inside of the oxygen barrier bag through a sampling rubber sheet (25mm×25mm, 2mm thick) pre-attached to the bag, and the oxygen concentration inside the gas barrier bag was measured.

[0183] [Table 1]

[0184]

[0185] As shown in Table 1, it can be seen that the deoxidizer composition and deoxidizer packaging of the embodiments have excellent residual oxygen absorption performance, and can absorb oxygen even in the presence of a large amount of moisture. On the other hand, it can be seen that the deoxidizer composition and deoxidizer packaging of the comparative examples containing inorganic powder fillers with apparent density that do not meet the specified range have very low residual oxygen absorption performance, and the large amount of moisture hinders the oxidation reaction, resulting in poor oxygen absorption performance.

[0186] As can be seen from the above, the oxygen absorber composition and oxygen absorber packaging of the present invention can absorb oxygen for a long time even when applied to foods with high water activity.

Claims

1. A deoxidizer composition comprising iron powder A, an alkali metal halide or an alkaline earth metal halide B, activated carbon C, and inorganic powder filler D. Inorganic powder filler D is a substance other than iron powder A, alkali metal halides or alkaline earth metal halides B, and activated carbon C. The apparent density of inorganic powder filler D is 1.10 g / cm³. 3 Above and 2.90 g / cm 3 the following, The content of inorganic powder filler D is 50-300 parts by weight relative to 100 parts by weight of iron powder A.

2. The deoxidizer composition according to claim 1, wherein, The inorganic powder filler D contains at least one selected from the group consisting of metal salts, elemental metals, and metal oxides.

3. The deoxidizer composition according to claim 1 or 2, wherein, Inorganic powder filler D is a metal carbonate.

4. The deoxidizer composition according to any one of claims 1 to 3, wherein, Inorganic powder filler D is calcium carbonate.

5. The deoxidizer composition according to any one of claims 1 to 4, wherein, The inorganic powder filler D is selected from at least one of the following groups: heavy calcium carbonate, crushed seashells, calcite, marble, limestone, and precipitated calcium carbonate.

6. The deoxidizer composition according to any one of claims 1 to 5, wherein, The average particle size of inorganic powder filler D is 10~500μm.

7. The deoxidizer composition according to any one of claims 1 to 6, wherein, The apparent density of inorganic powder filler D is 1.10 g / cm³. 3 Above and 1.50 g / cm 3 the following.

8. The deoxidizer composition according to any one of claims 1 to 7, wherein, The content of inorganic powder filler D is 105-200 parts by mass relative to 100 parts by mass of iron powder A.

9. The deoxidizer composition according to any one of claims 1 to 8, wherein, Alkali metal halides or alkaline earth metal halides B are alkaline earth metal halides.

10. The deoxidizer composition according to any one of claims 1 to 9, wherein, The alkali metal halide or alkaline earth metal halide B is selected from at least one of the group consisting of calcium chloride, magnesium chloride, magnesium bromide and calcium bromide.

11. The deoxidizer composition according to any one of claims 1 to 10, wherein, The content of activated carbon C is 0.5 to 5.0 parts by mass relative to 100 parts by mass of iron powder A.

12. The deoxidizer composition according to any one of claims 1 to 11, wherein, The content of alkali metal halide or alkaline earth metal halide B is 0.3 to 5.0 parts by mass relative to 100 parts by mass of iron powder A.

13. The deoxidizer composition according to any one of claims 1 to 12, wherein, The content of alkali metal halide or alkaline earth metal halide B is 1.1 to 3.0 parts by mass relative to 100 parts by mass of iron powder A.

14. A deoxidizer packaging body comprising the deoxidizer composition according to any one of claims 1 to 13 and a breathable packaging material containing the deoxidizer composition.

15. A method for preserving a food with high water activity, wherein the deoxidizer composition of any one of claims 1 to 13 or the deoxidizer packaging body of claim 14 is sealed with the food with high water activity in a gas-barrier container for preservation.

16. A high water activity food packaging body, comprising sealing the deoxidizer composition of any one of claims 1 to 13 or the deoxidizer packaging body of claim 14 with the high water activity food in a gas-barrier container.

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