UV inactivation of Semliki Forest virus and E. coli bacteria by alternative light sources

Journal of Photochemistry and Photobiology

卷:10

Linda Mezule¹  Anna Zajakina²  Atis Skudra³  Gita Revalde³  Kristiana Rancane⁴  Karina Spunde⁴  Talis Juhna⁵ 

[1] Correspondence author.;

[2] Institute of Technical Physics, Riga Technical University, Kalku str 1, Riga, LV-1658, Latvia;

[3] Institute of Atomic Physics and Spectroscopy, University of Latvia, Riga, Jelgavas str.3, LV-1004, Latvia;

[4] Latvian Biomedical Research and Study Centre, Ratsupites iela 1, Riga, LV-1067, Latvia;

[5] Water Research and Environmental Biotechnology Laboratory, Riga Technical University, Kalku str 1, Riga, LV-1658, Latvia;

关键词: UV disinfection;    Inactivation;    Virus restriction;    Reduction;    UV light sources;    Electrodeless lamps;   

DOI  :  

来源: DOAJ

【 摘 要 】

The quick spreading of the SARS-CoV-2 virus, initiating the global pandemic with a significant impact on economics and health, highlighted an urgent need for effective and sustainable restriction mechanisms of pathogenic microorganisms. UV-C radiation, causing inactivation of many viruses and bacteria, is one of the tools for disinfection of different surfaces, liquids, and air; however, mainly mercury 254 nm line is commonly used for it. In this paper, we report our results of the experiments with newly elaborated special type polychromatic non-mercury UV light sources, having spectral lines in the spectral region from 190 nm to 280 nm. Inactivation tests were performed with both Escherichia coli (E.coli) bacteria and Semliki Forest virus (SFV) as a representative of human enveloped RNA viruses. In addition, the effect of prepared lamps on virus samples in liquid and dry form (dried virus-containing solution) was tested. Reduction of 4 log10 of E.coli was obtained after 10 min of irradiation with both thallium-antimony and arsenic high-frequency electrodeless lamps. High reduction results for the arsenic light source demonstrated sensitivity of E. coli to wavelengths below 230 nm, including spectral lines around 200 nm. For the Semliki Forest virus, the thallium-antimony light source showed virus inactivation efficiency with a high virus reduction rate in the range of 3.10 to > 4.99 log10 within 5 min of exposure. Thus, the new thallium-antimony light source showed the most promising disinfection effect in bacteria and viruses, and arsenic light sources for bacteria inactivation, opening doors for many applications in disinfection systems, including for pathogenic human RNA viruses.

【 授权许可】

Unknown