Professor Ryosuke Kuroda of the Graduate School of Medicine, Kobe University and the research group of Ushio Denki have succeeded in an experiment that irradiates the human body with 222 nanometer ultraviolet rays and produces a bactericidal effect without affecting the skin.
神戸大学によると、研究グループはウシオ電機が開発した紫外線照射装置を用い、20人の健常者ボランティアの背中に1平方センチ当たり50、100、200、300、400、500ミリジュールの222ナノメートル紫外線を照射した。その結果、20人とも皮膚の日焼け反応である紅斑が確認されず、皮膚に影響が出ていないことが分かった。
さらに、同じ背中に1平方センチ当たり500ミリジュールの222ナノメートル紫外線を当て、照射前と5分後、30分後の皮膚常在菌数を調べたところ、40ミリ四方で照射前の7.21個が5分後に0.05個、30分後に0.79個となり、殺菌効果を上げていることも明らかになった。
Until now, 254 nanometer ultraviolet rays have been mainly used for drug-resistant bacteria, but it is said that direct irradiation is difficult because erythema appears at 1 millijoules per square centimeter when directly irradiated to the human body. rice field. With 10 nanometers of ultraviolet light, erythema does not appear even at a high irradiation dose of 222 millijoules per square centimeter, so the research group considers it effective for direct irradiation.
Ushio will release the unit type under development based on the irradiation device used in this experiment in Japan in September.From autumn, we plan to start providing light source modules to domestic and overseas lighting fixture manufacturers and sanitary equipment manufacturers.The company will continue to research the use of ultraviolet rays, aiming to develop medical equipment for the purpose of disinfecting and sterilizing surgical fields during surgery in the future.
Paper information:[PLOS ONE] Exploratory clinical trial on the safety and bactericidal effect of 222-nm ultraviolet C irradiation in healthy humans
