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Title: How much ozone bactericidal activity is compromised by plasma components?
Authors: Burgassi, Sandra
Zanardi, Iacopo
Travagli, Valter 
Montomoli, Emanuele
Bocci, Velio
Keywords: 4-hydroxynonenal, bactericidal activity, disinfection, hydrogen peroxide, ozone, plasma antioxidants.
Issue Date: 2009
Project: None 
Aims: Evaluation of bactericidal effect of different concentrations of ozone when used (a) as a gas, or (b) dissolved in saline. The addition of hydrogen peroxide or 4-hydroxynonenal dissolved in saline was also tested, as well as the effect of human plasma. Methods and Results: Staphylococcus aureus, methicillin-resistant Staph. aureus (MRSA), and Pseudomonas aeruginosa, suspended in their culture media were tested. While all bacteria suspended in protein-free saline were killed at high ozone concentrations, they survived when as little as 5% human plasma was present. Hydrogen peroxide was 100-fold less active than ozone and needed to remain in contact with bacteria for at least 60 min. 4-hydroxynonenal (2 lmol l)1) was inhibitory for proliferation of both Staph. aureus and MRSA, but not for Ps. aeruginosa. Conclusions: Ozone and the cascade of its derivative products are potent bactericidal agents, but even small amounts of human plasma, hence of hydro- and liposoluble antioxidants, in bacterial suspensions inhibit oxidation and protect bacteria. Significance and Impact of the Study: Any substantial in vivo cytocidal effect of ozone and its derivatives can be excluded. On the other hand, topical and continuous action of various ozone preparations remains valuable in a variety of skin and mucosal infections.
ISSN: 1364-5072
DOI: 10.1111/j.1365-2672.2008.04141.x
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