Efficacy of 265-nm ultraviolet light in inactivating infectious SARS-CoV-2

Hiroshi Shimoda; Junji Matsuda; Tatsuyuki Iwasaki; Daisuke Hayasaka

doi:10.1016/j.jpap.2021.100050

Efficacy of 265-nm ultraviolet light in inactivating infectious SARS-CoV-2

J Photochem Photobiol. 2021 Sep:7:100050. doi: 10.1016/j.jpap.2021.100050. Epub 2021 Jun 17.

Authors

Hiroshi Shimoda¹, Junji Matsuda², Tatsuyuki Iwasaki², Daisuke Hayasaka¹

Affiliations

¹ Laboratory of Veterinary Microbiology, Joint Faculty of Veterinary Medicine, Yamaguchi University, 1677-1 Yoshida, Yamaguchi 753-8515, Japan.
² Stanley Electric Co., Ltd., 2-9-13 Nakameguro, Meguro-ku, Tokyo 153-8636, Japan.

Abstract

Although, Low-pressure (LP) mercury lamps that emit wavelengths of around 254 nm have been widely applied as ultraviolet (UV) light devices for decontamination of microorganisms, they have raised environmental concerns due to their mercury content. Therefore, UV-LED lamps have high potential for practical use as a replacement for LP mercury lamps. In this study, we evaluated the efficacy of 265-nm UV irradiation in comparison to 254-nm and 280-nm UV irradiation for inactivating infectious severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Irradiation from a 265-nm deep UV light-emitting diode (DUV-LED) lamp efficiently inactivated SARS-CoV-2 at a similar level as a 254-nm UV cold cathode lamp, and at a higher level than a 280-nm DUV-LED lamp.

Keywords: 265-nm UV; Inactivation, DUV-LED; Sars-cov-2.