期刊
JOURNAL OF HOSPITAL INFECTION
卷 129, 期 -, 页码 58-64出版社
W B SAUNDERS CO LTD
DOI: 10.1016/j.jhin.2022.07.022
关键词
Antimicrobial; Antibacterial; Surface; Coatings; Cuprous oxide; Durable
资金
- National Science Foundation (NSF) [CBET-1902364]
- Virginia Tech's Proof of Concept program [238079]
- Virginia Tech Institute for Critical Technology and Applied Science Center for Engineered Health
- Virginia Tech Center for Emerging, Zoonotic, and Arthropod-Borne Pathogens
The study demonstrates that cuprous oxide coatings have broad-spectrum antimicrobial activity against nine different micro-organisms. For example, the Cu2O/PU coating killed 99.9997% of Pseudomonas aeruginosa and 99.9993% of Staphylococcus aureus in 1 hour. These coatings maintained their efficacy after weekly cleanings and showed no cytotoxicity to human cells.
Background: Disease can be spread through contact with contaminated surfaces (fomites). For example, fomites have been implicated in the spread of meticillin-resistant Staphylococcus aureus (MRSA) and Pseudomonas aeruginosa. Antimicrobial surface treatments are a potential method of reducing disease transmission from fomites, and broad-spectrum activity is desirable.Aim: To test cuprous oxide (Cu2O) and cupric oxide (CuO) coatings for antimicrobial activity against 12 micro-organisms including bacteria and fungi.Methods: We fabricated two surface coatings. The Cu2O coating was fabricated in a simple two-step process using polyurethane to bind the active copper oxide particles; CuO was prepared by heat treatment of Cu2O particles in air to produce cupric oxide (CuO) and to cause early-stage sintering to form a continuous coating. The antimicrobial activity was examined with 10 mL of microbial suspension droplets followed by counting cells as colony -forming units (cfu).Findings: The coatings rapidly killed nine different micro-organisms, including Gram-negative and Gram-positive bacteria, mycobacteria and fungi. For example, the Cu2O/ PU coating killed 99.9997% of P. aeruginosa and 99.9993% of S. aureus after 1 h. Efficacy was not reduced after weekly cleanings. The antimicrobial activity of the Cu2O coating was unchanged after abrasion treatment, and the coatings were not cytotoxic to human cells.Conclusion: The combination of broad-spectrum antimicrobial activity, abrasion resist-ance, and low toxicity of the Cu2O coating suggests potential use in healthcare settings.(c) 2022 The Healthcare Infection Society. Published by Elsevier Ltd. All rights reserved.
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