JP2006181901A - Multiplication inhibiting method against mold using alkali-treated rush - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To add to rush, by heat treating it with an alkali, the functionality of inhibiting the multiplication of mold which has not been found heretofore in the rush and to use the rush for building materials and raw materials of housing, papers, raw materials for clothes, packaging raw materials for foods and the like. <P>SOLUTION: The rush is dipped in an alkaline solution. The solution is heated at a high temperature of at least 100°C for ≥1 hour. After the heating the rush is washed with water to eliminate the influence of pH. As the rush material added with the function of inhibiting mold multiplication, it can be used for, for example, building materials and raw materials concerning housing, papers, raw materials for clothes, packaging raw materials for foods and the like. Even without water washing it is possible to use as the rush material added with the mold multiplication inhibiting function. In this case it is possible to add the mold multiplication controlling function through pH, in addition to the mold multiplication inhibiting effect the rush has, and the multiplication inhibiting effect against mold the rush shows is further enhanced. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

The present invention adds functionalities to prevent the growth of mold, which has not been seen in conventional rushes, by treating the rush with an alkali, such as building materials and materials for houses, papers, clothing materials, food packaging materials, etc. It relates to the new usage of rush used for the sushi.

As can be seen from the scent of tatami mats, rush is a crop with a unique scent. Many crops with such a unique scent have antibacterial properties and have been incorporated into our diet for a long time as wisdom prevention. To date, rush has been found to be antibacterial against food poisoning and spoilage bacteria. The rush against Salmonella, the most common food poisoning bacteria in developed countries, and other food poisoning bacteria, Staphylococcus aureus, enterohemorrhagic Escherichia coli O157, O26, O111, and rot bacteria Bacillus subtilis and Micrococcus. Has antibacterial properties. These antibacterial properties are exhibited at a rush concentration of about 1 to 10% on a lab scale.

However, rush does not have antibacterial activity against all microorganisms, and antibacterial activity has not been observed against yeasts and fungi. Tatami mats are said to be prone to mold growth if neglected, and rushes were thought to be grounds for antibacterial activity against mold. In other words, it is difficult to add the fungus growth suppression function to the rush by using the conventional rush.

  On the other hand, development of a highly safe method for inhibiting mold growth is also desired. Currently, there are methods of inhibiting the growth of molds, such as adding OPP (orthophenylphenol) and TBZ (thiabendazole) chemicals, all of which are recognized as food additives, but are toxic. Development of a strong, safe and inexpensive method for inhibiting mold growth is desired.

  As a specific means for solving the above-described problems of the conventional example, the present invention is a method of adding a fungus growth suppression function to rush by treating rush with alkali.

Summarizing these results, it became clear that heat-treating rush with an alkaline solution of pH 9 or higher can provide a fungus growth-inhibiting function. By this processing, it becomes possible to use, for example, building materials and materials related to houses, papers, clothing materials, packaging materials related to food, and the like as rush materials added with a fungus growth inhibition function. It is also possible to use rush as an anti-fungal growth inhibitor without washing with water after alkali treatment. In this case, in addition to the fungus-preventing effect of rush, mold growth control by pH Functions can also be added, and the effect of preventing proliferation of rush against mold will be further enhanced.

Next, a detailed description will be given based on specific embodiments of the present invention. In the present invention, an rush is used to add a function of inhibiting the growth of mold. The rush is first immersed in an alkaline solution. The pH of the alkaline solution varies depending on the mold to suppress growth, but it is immersed in an alkaline solution having a pH of 9 or higher, for example.

The rush immersed in an alkaline solution is heated at high temperature for 1 hour or more. The high temperature in this case refers to a temperature of about 100 ° C., which is a so-called “cooking” process. The heating time also varies depending on the mold that wants to suppress the growth, but the effect is exhibited by heating for more than 1 hour.

After heating, the rush is washed with water to eliminate the effects of pH, and then added to the fungus growth suppression function, such as building materials and materials for housing, paper, clothing materials, food packaging materials, etc. It can be used. It can be used as a rush material with an added function of preventing mold growth without washing. In this case, the effect of inhibiting the growth of mold by rush and adding the effect of inhibiting the growth of mold by pH is strongly useful for inhibiting the growth of mold.

(Experimental example)
Using rush (not muddy) as a material, the growth inhibition effect of mold was measured by the following method.

The rush was immersed in a solution of pH 3-11 and heated at 100 ° C. for 1 hour. After heating, the rush was washed with water to eliminate the effect of pH.

5 g of rush treated under the above conditions was mixed with 20 ml of potato dextrose agar medium (liquid) manufactured by Nissui Pharmaceutical Co., Ltd. and solidified on a petri dish. A thin mold spore suspension was applied thereto.

This was cultured at 30 ° C., and it was confirmed whether molds could grow on the petri dish. Evaluated in 4 stages according to mold growth (+++; grows in most petri dishes [70% or more], ++; grows about half of petri dishes [30-70%], +; ],-; Not growing on petri dish [0%]). A potato dextrose agar medium without rush added was used as a comparative control.

Aspergillus and Rhizopus were used as test bacteria. These are molds that are widely distributed in soil, fruits and vegetables.

As a result, the following results were obtained for Aspergillus. From this result, the rush treated with the solution up to pH 8 did not show the growth inhibitory effect against mold, but the rush treated with the solution at pH 9 or higher showed the growth inhibitory effect against mold.

The following results were obtained for Rhizopus. As for Rhizopus, rush treated with a solution up to pH 8 did not show the growth inhibitory effect against mold, but the rush treated with a solution of pH 9 or higher showed a growth inhibitory effect against mold. Particularly prominent was when treated at pH 11, and no mold growth was observed until the second day of culture.

  In this experiment, a rush that was not mud-dyed was used. However, the alkali-treated rush according to the present invention is not limited to this, and mud-dyed rush or newly sprouted rush may be used.

  The above-mentioned invention is a heat treatment of rushes, which adds functionality to prevent the growth of mold that was not seen in conventional rushes. For example, building materials and materials related to houses, papers, clothing materials, packaging materials related to food, etc. Is available as

Claims (2)

Heating rushes with alkali. A method for adding a fungus growth inhibiting function to a rush by the process according to claim 1.