Kitakyūshū, Japan
Kitakyūshū, Japan

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Kawahara T.,Shabondama Soap Co. | Kawahara T.,Soap Research Center | Kawahara T.,University of Occupational and Environmental Health Japan | Hatae S.,Shabondama Soap Co. | And 5 more authors.
Environmental Control in Biology | Year: 2016

Recently, large-scale forest fires have been occurring frequently worldwide. In forest fires, the use of the firefighting foam has greatly improved fire extinguishing effects, but the environmental impact from firefighting activities using foam still cause concerns. We have been developing a novel firefighting foam for forest fire with significantly lower environmental risk, consisting of soaps, chelating agent, and diluents. We determined the optimal composition of soap, and found the high biodegradable chelating agent with a high foaming performance.


Patent
Hiroshima University and Shabondama Soap Co. | Date: 2010-04-16

It is an object to provide an antiviral agent that can be used for persons having sensitive skin or on the face, inactivates viruses such as a norovirus and an influenza virus, and is excellent in germicidal properties. Further provided is a cleansing agent that does not lead to environmental pollution since the cleansing agent is easily decomposed in the natural environment, scarcely causes eczema and allergic dermatitis since no germicidal agent is added, and has an antiviral performance. The antiviral agent containing a surface-active agent having a C18 unsaturated alkyl group as an active component. It is not always necessary to lather or rinse off with water like cleansing agents such as medicated soaps since the antiviral agent of the present invention at a very low concentration can inactivate the virus.


Era M.,University of Kitakyushu | Sakai S.,University of Kitakyushu | Tanaka A.,University of Kitakyushu | Kawahara T.,Shabondama Soap Co. | And 2 more authors.
Japan Journal of Food Engineering | Year: 2015

The antifungal activity of nine fatty acid salts (butyrate, caproate, caprylate, caprate, laurate, myristate, oleate, linoleate, and linolenate) was tested on the spores of Penicillium pinophilum NBRC 6345 and Penicillium digitatum NBRC 9651. Potassium caprate showed the strongest antifungal activity at 4 log-units. At incubation times of 180 min, potassium caprylate and potassium laurate showed antifungal activities of 2 log-units against P. pinophilum NBRC 6345. These results suggest medium-chain fatty acid salts showed the highest antifungal activity. The minimum inhibitor y concentration of potassium caprate against P. pinophilum NBRC 6345 was 175 mM, and >175 mM for other fatty acid salts. When mixed with short-chain fatty acid salts (potassium butyrate, potassium caproate) or medium-chain fatty acid salts (potassium caprylate or potassium laurate), potassium caprate caused a 4 log-unit reduction in fungal growth; however, when mixed with long-chain fatty acid salts (potassium myristate, potassium oleate, potassium linoleate, or potassium linolenate) it had no antifungal effect. Thus, long-chain fatty acid salts inhibited antifungal activity of C10K. We also evaluated the ability of C10K to inhibit fungal growth on orange rind. C10K effectively inhibited P. pinophilum NBRC 6345 growth on orange rind. Thus, C10K shows promise as an antifungal agent. © 2015, Japan Society for Food Engineering. All rights reserved.


Masuda M.,University of Kitakyushu | Era M.,University of Kitakyushu | Kawahara T.,Shabondama Soap Co. | Kanyama T.,Shabondama Soap Co. | Morita H.,University of Kitakyushu
Biocontrol Science | Year: 2015

Fatty acid salts are a type of surfactant known to have potent antibacterial activity. We therefore examined the antibacterial activities of fatty acid salts against Streptococcus mutans. Potassium caprylate (C10K) , potassium laurate (C12K) , potassium myristate (C14K) , potassium oleate (C18:1K) , potassium linoleate (C18:2K) , and potassium linolenate (C18:3K) , used at a concentration of 175 mM, resulted in a 7 log-unit reduction of S. mutans after a 10-min incubation. The minimum inhibitory concentration (MIC) of C18:2K and C18:3K was 5.5 mM. C12K also demonstrated high antibacterial activity (MIC of 21.9 mM). These results indicate that C12K, C18:2K, and C18:3K have high antibacterial activity against S. mutans, and possess great potential as antibacterial agents.


Era M.,University of Kitakyusyu | Kawahara T.,Shabondama Soap Co. | Kanyama T.,Shabondama Soap Co. | Morita H.,University of Kitakyusyu
MATEC Web of Conferences | Year: 2016

Trichophyton violaceum is an anthropophilic fungus. Dermatophytosis (Tinea) is fungal infection that can infect the scalp, glabrous skin, and nails. In general, Tinea can be spread by skin-to-skin contact or bathroom or floor materials. The treatments of Tinea need antifungal medication and good hygiene environment. The effective antifungal medication and infection prevention, and the creation of antifungal medication with high safety are required. In this study was focused on the antifungal effect of fatty acids potassium salts. The antifungal activity of nine fatty acid salts (butyrate, caproate, caprylate, caprate, laurate, myristate, oleate, linoleate, and linolenate) was tested on the spores of Trichophyton violaceum NBRC 31064. The results show that C6K, C8K, C10K, C12K, C18:2K, C18:3K was the most inhibit 4-log unit (99.99 %) of the fatty acids potassium incubated time for 10 min. It was observed that C12K and C18:3K was most high antifungal activity MIC. Commercially soap was lowest antifungal activity. This is because of the oleic acid is a major component of soap. Although further investigation is necessary to make clear antifungal mechanisms, our results suggest that fatty acid potassium will use to the development of a coating agent such as furniture. © Owned by the authors, published by EDP Sciences, 2016.

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