Sterilizing Effects of Pulsed Xenon Ultraviolet Rays and Ozone and Hydrogen Peroxide: A Comparative Study

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  • KOBAYASHI Risa
    Center for the Study of Global Infection, Kyushu University Hospital
  • TABIRA Yuko
    Center for the Study of Global Infection, Kyushu University Hospital
  • SARUWATARI Yoshiko
    Center for the Study of Global Infection, Kyushu University Hospital
  • MORI Hitomi
    Department of Nursing, Kyushu University Hospital
  • KIYOSUKE Makiko
    Department of Clinical Chemistry and Laboratory Medicine, Kyushu University Hospital
  • SHIMONO Nobuyuki
    Center for the Study of Global Infection, Kyushu University Hospital

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  • パルスドキセノン紫外線とオゾン・過酸化水素による殺菌効果の比較検討

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<p>[Background] Contaminated healthcare environments are potential sources of infection spread, necessitating regular cleaning and disinfection. Recently, there has been a growing interest in environmental disinfection through indoor sterilization devices. Herein, we compared the sterilization effectiveness of two indoor sterilization devices: the Pulsed Xenon Ultraviolet (PX-UV) irradiation device and the ozone and hydrogen peroxide indoor sterilization device (Ozone-H2O2). </p><p>[Methods] We adjusted the inoculum concentration of seven pathogenic microorganisms, including spore-forming and multidrug-resistant bacteria relevant in healthcare settings, between 104 and 108 CFU/mL. We inoculated 10 μL of the microbial suspension onto Mueller-Hinton (MH) agar. The inoculated agar plates were tilted at a 45#176; angle, and we subjected them to 5 and 10-min PX-UV irradiation. Further, we conducted environmental sterilization using ozone-H2O2. The inoculated agar plates treated with PX-UV and ozone-H2O2 were incubated, and bacterial growth was assessed using a five-point scale.</p><p>[Results] After 5 min of PX-UV irradiation, bacterial growth was observed for Bacillus cereus and Candida parapsilosis. Following 10 min of PX-UV irradiation, minimal bacterial growth was observed for B. cereus. However, no bacteria were detected for all tested bacterial species after exposure to ozone-H2O2.</p><p>[Conclusion] In the case of PX-UV indoor sterilization, there was a tendency for spore-forming bacteria and Candida species to be less effectively sterilized.</p>

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