Application of ultraviolet-C radiation and gaseous ozone for microbial inactivation on different materials

Emmanuel I Epelle, Andrew Macfarlane, Michael Cusack, Anthony Burns, William MacKay, Mostafa Rateb, Mohammed Yaseen*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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Abstract

With the advent of the COVID-19 pandemic, there has been a global incentive for applying environmentally sustainable and rapid sterilization methods, such as ultraviolet-C radiation (UVC) and ozonation. Material sterilization is a requirement for a variety of industries, including food, water treatment, clothing, healthcare, medical equipment, and pharmaceuticals. It becomes inevitable when devices and items like protective equipment are to be reused on/by different persons. This study presents novel findings on the performance of these sterilization methods using four microorganisms (Escherichia coli , Staphylococcus aureus , Candida albicans , and Aspergillus fumigatus) and six material substrates (stainless steel, polymethyl methacrylate, copper, surgical facemask, denim, and a cotton-polyester fabric). The combination of both ozone and UVC generally yields improved performance compared to their respective applications for the range of materials and microorganisms considered. Furthermore, the effectiveness of both UVC and ozone was higher when the fungi utilized were smeared onto the nonabsorbent materials than when 10 μL droplets were placed on the material surfaces. This dependence on the contaminating liquid surface area was not exhibited by the bacteria. This study highlights the necessity of adequate UVC and ozone dosage control as well as their synergistic and multifunctional attributes when sterilizing different materials contaminated with a wide range of microorganisms.
Original languageEnglish
Pages (from-to)43006-43021
Number of pages16
JournalACS Omega
Volume7
Issue number47
Early online date15 Nov 2022
DOIs
Publication statusPublished - 29 Nov 2022

Keywords

  • ozone
  • ultraviolet-c radiation
  • microbial inactivation
  • personal protective equipment (PPE)
  • material contamination

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