Analysis of Bactericidal Material Generated by Electrical Devices Advertising Bactericidal Ability against Bacteria on the Agar Gel Plates

NISHIMURA  Hidekazu

doi:10.11150/kansenshogakuzasshi.86.723

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殺菌性能を有する空中浮遊物質の放出を謳う各種電気製品の，寒天平板培地上の細菌に対する殺菌能の本体についての解析
第86回日本感染症学会総会学術講演会座長推薦論文殺菌性能を有する空中浮遊物質の放出を謳う各種電気製品の,寒天平板培地上の細菌に対する殺菌能の本体についての解析
ダイ86カイニホンカンセンショウガッカイソウカイガクジュツコウエンカイザチョウスイセンロンブンサッキンセイノウオユウスルクウチュウフユウブッシツノホウシュツオウタウカクシュデンキセイヒンノ,カンテンヘイバンバイチジョウノサイキンニタイスルサッキンノウノホンタイニツイテノカイセキ
各種電気製品の寒天平板培地上の殺菌の本体

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Several Japanese companies sell electrical devices advertised as effective in inactivating viruses and killing bacteria by releasing special materials, e.g., Plasmacluster ions, Nanoe particle and minus ions, into the air. 　These companies claim that their devices killed bacteria on plates in their own experiments. <BR>We tested device effectiveness using the same experiments from the Plasmacluster ioniser SHARP Co.,Japan, the Nanoe generator Panasonic Co., Japan, and the Vion KING JIM Co., Japan, to test their advertising claims. Bactericidal ability on agar plate was tested, using Staphylococcus aureus, Pseudomonas aeruginosa, Bacillus cereus, and Enterococcus faecalis as follows : the medium containing a certain amount of each bacterium was put onto an agar plate and smeared. Plates were kept in a closed chamber (inner volume 14.4m³) ora glove box (inner volume 0.2m³), with one of the devices run for 2 hours. Plates not exposed to any device were used as controls. Each plate was retrieved and put in an incubator to count the number of bacterial colonies formed on the plate. <BR>There was no significant difference in the number of colonies on plates exposed to devices compared to control, in the number for all devices, or in all bacteria tested in experiments in the 14.4m³ chamber. These results strongly suggest that these devices have almost no bactericidal effect, at least in space exceeding this volume. <BR>Colony formation was suppressed in the glove box in all devices and in all bacteria tested except P. aeruginosa, although the degree of suppression differed among experiments. The colony formation suppression mechanism was analyzed, and indicated that : colony formation did not change even after the removal of Plasmacluster ions, Nanoe particles, or negative ions from the air, while colony formation was decreased drastically by the removal of ozone from space, which was revealed to be generated inevitably during device operation. These results strongly suggest that the bactericidal effect seen only on the agar plate in narrow space was explained by ozone released in space as a by-product, not by special materials as advertising claimed. <BR>It is thus important to analyze the effect of special materials such as those done in this study and to suggest the involvement of ozone as the true cause, as have been done in this study, in evaluating bactericidal effect or viral inactivation as advertised by these companies.

Journal

Kansenshogaku Zasshi

Kansenshogaku Zasshi 86 (6), 723-733, 2012

The Japanese Association for Infectious Diseases

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