JPS62262944A - Production of freshness retaining agent for vegetable and fruit - Google Patents

Abstract

PURPOSE:To make it possible to hold freshness of vegetable and fruits for a long period, by containing a carrier impregnated with an inorganic acid solution containing a halogen-containing oxy acid or salt thereof and a dehydrating agent in an air-permeable bag to form a freshness retaining agent. CONSTITUTION:This freshness retaining agent for vegetables and fruits is prepared by containing a carrier impregnated with an inorganic acid solution containing a halogen-containing oxy acid or salt thereof and a dehydrating agent in an air-permeable bag. An alkali salt of bromic acid is preferred for the halogen-containing oxy acid and sulfuric acid is preferred for the inorganic acid. A solid dehydrating agent is used as the dehydrating agent and calcium chloride, silica gel, water absorbing polymers, etc., may be cited. A bag prepared by perforating paper or plastic film, e.g. polyethylene or polypropylene, etc., may be cited as the air-permeable bag and air-permeable waterproof cloth is particularly preferred. The above-mentioned freshness retaining agent, together with vegetables and fruits, is placed in a hermetically sealed container.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a freshness-preserving agent for fruits and vegetables, and more specifically, it adsorbs gas components that cause deterioration, such as ethylene, generated from fruits and vegetables during sealed storage. This invention relates to a freshness-preserving agent used to maintain the freshness of fruits and vegetables for a long period of time.

[Prior art]

It has been known that carriers impregnated with halogen-containing oxygen acids or inorganic acid solutions containing halogen-containing oxygen acids have an excellent absorption capacity for, for example, ethylene (Japanese Patent Application Laid-Open No. 2003-120001-Gt7J: (Japanese Patent Publication No. 1999-1993-1g-9t/dal).

[Problem that the invention seeks to solve]

However, surprisingly, this freshness-preserving agent has the disadvantage that its ability to adsorb diethylene and the like is significantly reduced when it comes into contact with water or steam, and therefore cannot be used as a freshness-preserving agent for long-term use. In other words, in practical situations, the above-mentioned carrier is placed inside a sealed container together with fruits and vegetables, but the moisture generated by the transpiration of the plants creates high humidity inside the container, and as a result, the ability to adsorb gases such as ethylene decreases over time. deteriorates and cannot withstand long-term use.

The present invention provides a freshness-preserving agent that is highly effective over a long period of time.

[Means for solving problems]

The above object of the present invention is achieved by a freshness-preserving agent characterized in that a carrier impregnated with a halogen-containing oxygen acid or an inorganic acid solution in which the acid is dissolved and a dehydrating agent are housed in a breathable bag. be done.

To explain the present invention in detail, the carrier used in the present invention is not particularly limited and includes activated carbon zeolite, diatomaceous earth, activated alumina, etc., but activated carbon is usually used. Oxygen acids containing 710 gen include chloric acid,
Examples include chlorous acid, hypochlorous acid, bromate acid, bean-smelling rA acid, hypobromous acid, iodine acid, etc., and examples of the salts thereof include potassium or sodium salts thereof.

Preferred is sodium bromate or potassium bromate. Examples of the inorganic acid include hydrochloric acid, nitric acid, sulfuric acid, and phosphoric acid, but sulfuric acid is preferred. The specific method for preparing the adsorbent of the present invention is explained by dissolving 10-10% of an oxyacid or a salt thereof containing 0.6% of an inorganic acid in a solution of 0.6% of an inorganic acid, and then dissolving 10-10% of an oxyacid or a salt thereof containing 0.6% of an inorganic acid, and then dissolving a 10-10% of an oxyacid or a salt thereof in a solution of an inorganic acid of 0.6% to 10%, and then dissolving a 10-10% of an oxyacid containing a is added, impregnated for a certain period of time, and then filtered and dried. The carrier impregnated with an inorganic acid solution containing a halogen-containing oxygen acid or a salt thereof constitutes an adsorbent for gas components that cause deterioration of fruits and vegetables.

Solid dehydrating agents used together with the adsorbent include calcium chloride, silica gel, water-absorbing polymers, and the like.

The N-absorbing agent and the dehydrating agent are housed in a breathable bag to constitute a freshness-preserving agent.

Examples of the breathable bag include paper or a glass film made of polyethylene, polypropylene, etc., with holes made therein, and breathable waterproof cloth is particularly preferred.

Breathable waterproof fabric is a sheet that is breathable to water vapor and impermeable to water droplets, specifically,
Examples include polyamino acid urethane resin films used as artificial leather (conventionally) and commercially available porous special films.

When a breathable waterproof cloth is used as a storage bag, the water generated by transpiration of the plant body will not enter the adsorbent and the freshness-preserving agent of the present invention as water droplets. The effect can be maintained for a longer period of time.

In addition, it is preferable for handling that the dehydrating agent contained in the freshness preserving agent is further stored in a breathable bag, and furthermore, this breathable bag is made of a breathable waterproof fabric as described above. In this case, the water adsorbed by the dehydrating agent does not appear as water droplets on the surface of the breathable waterproof fabric, so there is no contact between the adsorbent and water, and as a result, the adsorbent's ability to adsorb altered gas components is further improved. maintained high.

The ratio of the adsorbent for altered gas components and the dehydrating agent varies depending on the hygroscopic ability of the dehydrating agent, etc., but generally it is in the range of 0.1-5 parts by weight of the dehydrating agent per part by weight of the yv absorbing agent. Appropriately selected from The adsorbent and dehydrating agent may be directly stored in a breathable bag, but this is not recommended.

Next, a method of using the freshness preserving agent of the present invention will be explained.

The freshness preserving agent of the present invention is placed in a closed container together with fruits and vegetables. For airtight containers, use polyethylene, polypropylene/
Examples include bags made of plastic films, sheets, etc. Freshness-preserving axes are usually used for fruits and vegetables in the range of 1 kg to 1 kg. The gas components adsorbed by the freshness-preserving agent of the present invention include gases generated as a result of metabolism of fruits and vegetables after harvesting, and various gas components generated as a result of deterioration, including ethylene, acetaldehyde, etc. Other odorous components include hydrogen sulfide and ammonia.

The freshness preserving agent of the present invention can be applied to all fruits and vegetables, but especially fruits such as apples, pears, tangerines, persimmons, loquats, peaches, bananas, grapes, cherries, kabosu, and plums. For example, it can be preferably applied to fruits and vegetables such as tomatoes, kirari, Japanese radish, and green peppers, and vegetables such as bamboo shoots, matsutake, spinach, chives, lettuce, and cabbage.

〔Example〕

The present invention will be explained in more detail with reference to Examples below.

lN-sulfuric acid aqueous solution containing lS% sodium bromate #
Add 100- granular activated carbon to 100- and SO℃1
Stir for hours.

After treatment, the granular activated carbon is separated by extreme filtration, and then heated to 100"C.
The adsorbent was obtained by drying in the evening.

The thus obtained adsorbent/Qji and the porous film (film thickness izo [μ], air permeability 3jt (BeC/1
00 Cc), moisture permeability CM/100C1ft1
1/hr)) Calcium chloride iog having an average particle size of 3, which was stored in a different bag, was stored in a bag with a length of 4 ctn and a width of 10 cm, which was made of the same porous film, and the freshness preserving agent of the present invention was added. Obtained.

One bag of the above-mentioned freshness-preserving agent was placed in a polyethylene bag having a thickness of jjμ along with Cabosco after harvesting, and the fruit was stored at 3° C., and rotten fruit was examined over time.

For comparison, a similar test was conducted using the same bag-packed adsorbent as above, except that the dehydrating agent was removed.

The results are shown in Table 1.

〔Effect of the invention〕

The freshness-preserving agent of the present invention described above can maintain adsorption ability for altered gas components and the like over a long period of time, and maintains sufficient freshness. In particular, the freshness-keeping agent of the present invention is suitable as a freshness-keeping agent by adsorbing ethylene.

Claims (3)

[Claims] (1) A freshness-preserving agent comprising a carrier impregnated with an inorganic acid solution containing a halogen-containing oxygen acid or its salt and a dehydrating agent housed in a breathable bag. (2) The freshness-preserving agent according to claim 2, wherein the halogen-containing oxygen acid is an alkali salt of bromate. (3) The freshness preserving agent according to claim 1 or 2, wherein the inorganic acid is sulfuric acid.