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Irradiation of UVC LED at 277 nm inactivates coronaviruses in association to photodegradation of spike protein.


ABSTRACT: To interrupt SARS-CoV-2 transmission chains, Ultraviolet-C (UVC) irradiation has emerged as a potential disinfection tool to aid in blocking the spread of coronaviruses. While conventional 254-nm UVC mercury lamps have been used for disinfection purposes, other UVC wavelengths have emerged as attractive alternatives but a direct comparison of these tools is lacking with the inherent mechanistic properties unclear. Our results using human coronaviruses, hCoV-229E and hCoV-OC43, have indicated that 277-nm UVC LED is most effective in viral inactivation, followed by 222-nm far UVC and 254-nm UVC mercury lamp. While UVC mercury lamp is more effective in degrading viral genomic content compared to 277-nm UVC LED, the latter results in a pronounced photo-degradation of spike proteins which potentially contributed to the higher efficacy of coronavirus inactivation. Hence, inactivation of coronaviruses by 277-nm UVC LED irradiation constitutes a more promising method for disinfection.

SUBMITTER: Ong Q 

PROVIDER: S-EPMC9575548 | biostudies-literature | 2022 Oct

REPOSITORIES: biostudies-literature

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Irradiation of UVC LED at 277 nm inactivates coronaviruses in association to photodegradation of spike protein.

Ong Qunxiang Q   Ronnie Teo J W JW   Dela Cruz Joshua J   Wee Elijah E   Wee Winson W   Han Weiping W  

Heliyon 20221017 10


To interrupt SARS-CoV-2 transmission chains, Ultraviolet-C (UVC) irradiation has emerged as a potential disinfection tool to aid in blocking the spread of coronaviruses. While conventional 254-nm UVC mercury lamps have been used for disinfection purposes, other UVC wavelengths have emerged as attractive alternatives but a direct comparison of these tools is lacking with the inherent mechanistic properties unclear. Our results using human coronaviruses, hCoV-229E and hCoV-OC43, have indicated tha  ...[more]

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