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Activity of ozonated water and ozone against Staphylococcus aureus and Pseudomonas aeruginosa biofilms.

Bialoszewski D, Pietruczuk-Padzik A, Kalicinska A, Bocian E, Czajkowska M, Bukowska B, Tyski S - Med. Sci. Monit. (2011)

Bottom Line: The degree of reduction of viable bacteria following ozone exposure was determined.Ozonated water was found to be an effective bactericidal agent against biofilms after as little as 30 seconds of exposure, while the bactericidal activity of the ozone-oxygen solution was much lower.Unlike the ozone-oxygen mixture, ozonated water effectively destroys bacterial biofilms in vitro.<br />

View Article: PubMed Central - PubMed

Affiliation: Department of Physiotherapy, Second Medical Faculty, Medical University of Warsaw, Warsaw, Poland. dariusz.bialoszewski@wum.edu.pl

ABSTRACT

Background: The known bactericidal properties of ozone have not been checked in relation to its action on bacterial biofilms. This is especially true of ozonated fluids. The aim of this study was to investigate the bactericidal activity of ozonated water and that of a mixture of ozone and oxygen against biofilms.

Material/methods: Eighteen clinical strains of Staphylococcus aureus and Pseudomonas aeruginosa exhibiting various levels of antibiotic sensitivity were investigated. Bacteria were cultured in biofilm form on polystyrene titration plates for periods of 2 to 72 hours. The biofilms formed in this way were exposed to in statu nascendi ozonated water produced in a prototype device that had been tested in clinical conditions, or to a mixture of oxygen and ozone generated in the same device. Live cells in the biofilm were stained with a 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium (MTT) bromide solution. The degree of reduction of viable bacteria following ozone exposure was determined.

Results: Ozonated water was found to be an effective bactericidal agent against biofilms after as little as 30 seconds of exposure, while the bactericidal activity of the ozone-oxygen solution was much lower. Prolongation of the duration of biofilm exposure to the gaseous disinfectant to 40 minutes led to a reduction in the viable cell count, which nevertheless remained high.

Conclusions: Unlike the ozone-oxygen mixture, ozonated water effectively destroys bacterial biofilms in vitro.

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Related in: MedlinePlus

Effect of oxygen-ozone mixture on biofilms of 9 strains of P. aeruginosa after 2, 24, 48 and 72 hours of incubation.
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f3-medscimonit-17-11-br339: Effect of oxygen-ozone mixture on biofilms of 9 strains of P. aeruginosa after 2, 24, 48 and 72 hours of incubation.

Mentions: The mixture of gaseous oxygen and ozone had a weaker effect on biofilms of both P. aeruginosa (Figure 3) and S. aureus (Figure 4) strains. No distinct differences were noted between the effects of exposure to gaseous ozone for 20 vs. 40 minutes. The staphylococcal biofilms were slightly more sensitive to gaseous ozone compared to P. aeruginosa strains. However, even after the 40 minute exposure, the levels of viable cells remained high in all strains. For S. aureus, the best effects were obtained for biofilms after 24 hours of incubation, and the least pronounced bactericidal effects of the oxygen-ozone mixture were observed in the case of 48-hour biofilms. P. aeruginosa biofilms were more tolerant to the action of gaseous O3. A relatively stronger bactericidal effect was seen in the case of 2-hour biofilms, but this was observed only for 5 out of the 9 strains investigated. More mature biofilms of most Pseudomonas strains did not demonstrate reduced viability even after 40 minutes exposure, with some instances of increased viable counts registered after 20 minutes of exposure to the gaseous mixture.


Activity of ozonated water and ozone against Staphylococcus aureus and Pseudomonas aeruginosa biofilms.

Bialoszewski D, Pietruczuk-Padzik A, Kalicinska A, Bocian E, Czajkowska M, Bukowska B, Tyski S - Med. Sci. Monit. (2011)

Effect of oxygen-ozone mixture on biofilms of 9 strains of P. aeruginosa after 2, 24, 48 and 72 hours of incubation.
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC3539485&req=5

f3-medscimonit-17-11-br339: Effect of oxygen-ozone mixture on biofilms of 9 strains of P. aeruginosa after 2, 24, 48 and 72 hours of incubation.
Mentions: The mixture of gaseous oxygen and ozone had a weaker effect on biofilms of both P. aeruginosa (Figure 3) and S. aureus (Figure 4) strains. No distinct differences were noted between the effects of exposure to gaseous ozone for 20 vs. 40 minutes. The staphylococcal biofilms were slightly more sensitive to gaseous ozone compared to P. aeruginosa strains. However, even after the 40 minute exposure, the levels of viable cells remained high in all strains. For S. aureus, the best effects were obtained for biofilms after 24 hours of incubation, and the least pronounced bactericidal effects of the oxygen-ozone mixture were observed in the case of 48-hour biofilms. P. aeruginosa biofilms were more tolerant to the action of gaseous O3. A relatively stronger bactericidal effect was seen in the case of 2-hour biofilms, but this was observed only for 5 out of the 9 strains investigated. More mature biofilms of most Pseudomonas strains did not demonstrate reduced viability even after 40 minutes exposure, with some instances of increased viable counts registered after 20 minutes of exposure to the gaseous mixture.

Bottom Line: The degree of reduction of viable bacteria following ozone exposure was determined.Ozonated water was found to be an effective bactericidal agent against biofilms after as little as 30 seconds of exposure, while the bactericidal activity of the ozone-oxygen solution was much lower.Unlike the ozone-oxygen mixture, ozonated water effectively destroys bacterial biofilms in vitro.<br />

View Article: PubMed Central - PubMed

Affiliation: Department of Physiotherapy, Second Medical Faculty, Medical University of Warsaw, Warsaw, Poland. dariusz.bialoszewski@wum.edu.pl

ABSTRACT

Background: The known bactericidal properties of ozone have not been checked in relation to its action on bacterial biofilms. This is especially true of ozonated fluids. The aim of this study was to investigate the bactericidal activity of ozonated water and that of a mixture of ozone and oxygen against biofilms.

Material/methods: Eighteen clinical strains of Staphylococcus aureus and Pseudomonas aeruginosa exhibiting various levels of antibiotic sensitivity were investigated. Bacteria were cultured in biofilm form on polystyrene titration plates for periods of 2 to 72 hours. The biofilms formed in this way were exposed to in statu nascendi ozonated water produced in a prototype device that had been tested in clinical conditions, or to a mixture of oxygen and ozone generated in the same device. Live cells in the biofilm were stained with a 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium (MTT) bromide solution. The degree of reduction of viable bacteria following ozone exposure was determined.

Results: Ozonated water was found to be an effective bactericidal agent against biofilms after as little as 30 seconds of exposure, while the bactericidal activity of the ozone-oxygen solution was much lower. Prolongation of the duration of biofilm exposure to the gaseous disinfectant to 40 minutes led to a reduction in the viable cell count, which nevertheless remained high.

Conclusions: Unlike the ozone-oxygen mixture, ozonated water effectively destroys bacterial biofilms in vitro.

Show MeSH
Related in: MedlinePlus