Simultaneous Irradiation with UV-A, -B, and -C Lights Promotes Effective Decontamination of Planktonic and Sessile Bacteria: A Pilot Study

Author:

Bosso Andrea1ORCID,Tortora Francesca1ORCID,Culurciello Rosanna1,Di Nardo Ilaria1,Pistorio Valeria2ORCID,Carraturo Federica13ORCID,Colecchia Andrea4,Di Girolamo Rocco5ORCID,Cafaro Valeria1ORCID,Notomista Eugenio1ORCID,Ingenito Raffaele6ORCID,Pizzo Elio17ORCID

Affiliation:

1. Department of Biology, University of Naples Federico II, 80126 Naples, Italy

2. Centre de Recherche Saint-Antoine (CRSA), Sorbonne University, Inserm, 75012 Paris, France

3. Hygiene Laboratory, Centro Servizi Metrologici e Tecnologici Avanzati (CeSMA), University of Naples Federico II, 80146 Naples, Italy

4. Physics Department “Ettore Pancini”, University of Naples Federico II, 80126 Naples, Italy

5. Department of Chemical Sciences, University of Naples Federico II, 80126 Naples, Italy

6. Naturamla S.R.L., 00195 Rome, Italy

7. Centro Servizi Metrologici e Tecnologici Avanzati (CeSMA), University of Naples Federico II, 80126 Naples, Italy

Abstract

Surfaces in highly anthropized environments are frequently contaminated by both harmless and pathogenic bacteria. Accidental contact between these contaminated surfaces and people could contribute to uncontrolled or even dangerous microbial diffusion. Among all possible solutions useful to achieve effective disinfection, ultraviolet irradiations (UV) emerge as one of the most “Green” technologies since they can inactivate microorganisms via the formation of DNA/RNA dimers, avoiding the environmental pollution associated with the use of chemical sanitizers. To date, mainly UV-C irradiation has been used for decontamination purposes, but in this study, we investigated the cytotoxic potential on contaminated surfaces of combined UV radiations spanning the UV-A, UV-B, and UV-C spectrums, obtained with an innovative UV lamp never conceived so far by analyzing its effect on a large panel of collection and environmental strains, further examining any possible adverse effects on eukaryotic cells. We found that this novel device shows a significant efficacy on different planktonic and sessile bacteria, and, in addition, it is compatible with eukaryotic skin cells for short exposure times. The collected data strongly suggest this new lamp as a useful device for fast and routine decontamination of different environments to ensure appropriate sterilization procedures.

Publisher

MDPI AG

Subject

Inorganic Chemistry,Organic Chemistry,Physical and Theoretical Chemistry,Computer Science Applications,Spectroscopy,Molecular Biology,General Medicine,Catalysis

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