JPS6260936B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a novel oxygen absorbent. Recently, as a new method for preserving food, clothing, fur, medicine, etc., methods of preserving food by removing oxygen in a closed system containing these substances, that is, preservation methods that use oxygen absorbers, have been attracting attention. . Many substances that can be used as oxygen absorbers have been proposed so far, such as dithionite salts (sodium hydrosulfite, etc.), sulfites, metal powders, catechol L-ascorbate, A method has been proposed in which a compound containing various organic compounds such as hydroquinone as a main component is reacted with oxygen. However, the oxygen absorbents proposed so far have had a common problem in that the oxygen absorption reaction does not proceed in the absence of moisture. That is, an oxygen absorbent containing the above-mentioned substance as a main component may contain other ingredients and water or a substance retaining water as necessary, for example,
The oxygen absorption reaction of the substance can only proceed by mixing a compound with water of crystallization or by using the water evaporating from the food to be preserved. Therefore, if you apply the above-mentioned oxygen absorber to dry foods that are extremely sensitive to moisture transfer and store them, you may find that the quality deteriorates due to moisture transfer, or that the oxygen absorption Even if the agent absorbs oxygen, the moisture in the oxygen absorbent is lost due to moisture transfer, and the oxygen absorbing ability is also lost, so the quality gradually deteriorates due to the oxygen that enters little by little through the film used for packaging. In some cases, deterioration was observed. As a result of repeated research to improve the above-mentioned drawbacks found in conventional oxygen absorbers, the inventors of the present invention have discovered that an oxygen absorbent that does not use any water and does not reduce its ability at all even when used on any dry food. This led to the invention of an absorbent. That is, the present invention is an oxygen absorbent in which an unsaturated fatty acid or an oil or fat containing an unsaturated fatty acid is supported on a porous carrier. Animal and vegetable fats and oils containing a large amount of unsaturated fatty acids and triglycerides of unsaturated fatty acids are either liquid or solid, so they are not only difficult to handle as they are, but also cannot exhibit a practical oxygen absorption rate as an oxygen absorbent. do not have. Therefore, the present inventors have discovered that by supporting unsaturated fatty acids or animal and vegetable oils and fats containing unsaturated fatty acids on a porous carrier, not only can the oils and fats be handled as powder or granules, but also the oxygen absorption rate can be greatly increased. It has been found that it has a practically sufficient speed as an oxygen absorbent. There are no particular restrictions on the porous carrier as long as it adsorbs oil, such as silica gel, alumina, zeolite, activated carbon, etc. As for the method of adsorbing oil, if it is a liquid oil, it is sufficient to mix it normally; if it is a solid fat, it is sufficient. Even if it is, it is possible to support it uniformly by heating it above its melting point and mixing. In addition, V, Cr, Mr, Fe, Co, Ni,
The oxygen absorption rate is further accelerated by adding transition metals such as Cu and Zn or their compounds. When foods, etc. are preserved using oxygen absorbers using oils and fats as described above, spoilage odor may occur due to oxidation of the oils and fats. In order to prevent this, the occurrence of off-flavors can be prevented by adding activated carbon separately or by using activated carbon as a carrier and suppressing the adsorption amount of fats and oils below its maximum adsorption amount. Furthermore, oxygen adsorbents made by adsorbing fats and oils onto carriers can be used in the same package as conventional oxygen absorbers.
For dry foods, etc., the oxygen in the original packaging bag is removed using an oxygen absorbent mainly made of iron powder, and then the oxygen that enters through the packaging film is removed using the oxygen absorbent of the present invention. It is also possible to remove it. The present invention will be explained below with reference to Examples. Examples 1 to 14 Oxygen absorption per 5 g of an oxygen scavenger in which 30 parts by weight of each of various unsaturated fatty acids or fats and oils are supported on 100 parts by weight of a carrier such as activated carbon, and an additional 5 parts by weight of a catalyst The results of measuring the amounts are shown in Table 1. 【table】

Claims (1)

[Scope of Claims] 1. An oxygen absorbent comprising an unsaturated fatty acid or an oil or fat containing an unsaturated fatty acid supported on a porous carrier. 2. The oxygen absorbent according to claim 1, which contains a transition metal or a compound thereof as a catalyst. 3 V, Cr, Mn, Fe, Co, Ni, as a catalyst
Claim 2 containing at least one member of the group consisting of transition metals such as Cu and Zn and their compounds
Oxygen absorbent as described in section. 4. The oxygen absorbent according to claim 1, 2 or 3, wherein the porous carrier is activated carbon.