Study on disinfection effect of a 222-nm UVC excimer lamp on object surface

AMB Express

Original Article

Yang Liu¹  Baiqi Wang²  Feng Gao³  Yanzhen Han⁴  Peiyong Ning⁴  Xin Gao⁴  Ying Wang⁴  Yuan Wang⁴  Xiaoyan Li⁴  Zhili Sun⁵  Shengchun Liu⁵  Xinru Wang⁵  Guanyi Chen⁵ 

[1] Animal, Plant and Foodstuffs Inspection Centre of Tianjin Customs, 300457, Tianjin, China;Department of Occupational and Environmental Health, School of Public Health, Tianjin Medical University, 300070, Tianjin, China;Tianjin Key Laboratory of Environment, Nutrition and Public Health, 300070, Tianjin, China;Tianjin Bureau of Commerce, 300040, Tianjin, China;Tianjin Centers for Disease Control and Prevention-Institute of Microbiology, 300011, Tianjin, China;Tianjin Key Laboratory of Pathogenic Microbiology of Infectious Disease, Tianjin Centers for Disease Control and Prevention, 300011, Tianjin, China;Tianjin University of Commerce, 300134, Tianjin, China;

关键词: The 222-nm UVC excimer lamp;    Surface disinfection;    Standard bacteria;    Cold-chain goods;   

DOI  :  10.1186/s13568-023-01611-1

 received in 2023-09-06, accepted in 2023-09-19,  发布年份 2023

来源: Springer

【 摘 要 】

Effective disinfection of contaminated surfaces is essential for preventing the transmission of pathogens. In this study, we investigated the UV irradiance and wavelength distribution of a 222-nm ultraviolet C (UVC) excimer lamp and its disinfection efficacy against microorganisms in laboratory conditions. By using a carrier quantitative germicidal test with stainless steel sheets as carriers, we examined the disinfection effect of the 222-nm UVC lamp on three standard strains-Staphylococcus aureus, Escherichia coli, and Pseudomonas aeruginosa. We tested the disinfection efficacy under different conditions by adjusting irradiation time, as well as the state and temperature of the stainless steel carriers. Our results indicated that a bacterial suspension in PBS and not-dried stainless steel carriers yielded better disinfection than in TSB and dried carriers. Additionally, carrier temperature had no significant impact on disinfection efficacy. When utilizing a bacterial suspension in PBS and non-dried carriers at a temperature of 20 °C, the three bacteria were eliminated by 222-nm UVC excimer lamp irradiation in just 15 s. In contrast, when using a bacterial suspension in TSB and dried carriers at temperatures of 20 °C, 4 °C, or − 20 °C, the three bacteria were eradicated by 222-nm UVC excimer lamp irradiation in 60 s. Comparatively, the LPM lamp required more than 10 min to achieve the same disinfection effect. Our data demonstrate that the 222-nm UVC excimer lamp has higher irradiance and a more potent microbial disinfection effect than the LPM lamp, requiring significantly less irradiation time to achieve the same disinfection effect under identical conditions. Furthermore, the 222-nm UVC excimer lamp exhibited a substantial disinfection effect on bacterial propagules at low temperatures. Our findings support the optimization of “tunnel-type” cold-chain goods disinfection devices, providing an alternative, highly efficient, and practical tool to combat the spread of SARS-CoV-2 through cold-chain systems.Graphical Abstract

【 授权许可】

CC BY   
© Springer-Verlag GmbH Germany, part of Springer Nature 2023

【 图 表 】

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