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Applied Microbiology and Biotechnology

, Volume 99, Issue 5, pp 2305–2312 | Cite as

The concentration-determined and population-specific antimicrobial effects of free nitrous acid on Pseudomonas aeruginosa PAO1

  • Shu-Hong Gao
  • Lu FanEmail author
  • Zhiguo Yuan
  • Philip L BondEmail author
Applied microbial and cell physiology

Abstract

There is great potential to use free nitrous acid (FNA/HNO2), the protonated form of nitrite, as an antimicrobial agent due to its bacteriostatic and bactericidal effects on a range of microorganisms. Here, we determine the effects of FNA on the opportunistic pathogen Pseudomonas aeruginosa PAO1, a well-studied denitrifier capable of nitrate/nitrite reduction in its anaerobic respiration. It was seen that lower FNA concentrations in the range of 0.1 to 0.2 mg N/L exerted a temporary inhibitory effect on the growth of P. aeruginosa, while respiratory inhibition was not detected until an FNA concentration of 1.0 mg N/L was applied. The FNA concentration of 5.0 mg N/L caused complete cell killing and likely cell lysis. The results suggest concentration-related and multiple antimicrobial effects of FNA. Differential killing of FNA in the P. aeruginosa subpopulations was detected, suggesting intrastrain heterogeneity, and does not support the idea of specific concentrations of FNA bringing about bacteriostatic and bactericidal effects on this species. A delayed recovery from FNA treatment suggested that FNA caused cell damage which required repair prior to the organism showing cell growth. The results of the study provide insight of the inhibitory and biocidal mechanisms of FNA on this important microorganism.

Keywords

Free nitrous acid Bacteriostatic Bactericidal Pseudomonas aeruginosa PAO1 

Notes

Acknowledgments

We acknowledge the Australian Research Council for funding support of project DP120102832 (Biofilm Control in Wastewater Systems using Free Nitrous Acid—a Renewable Material from Wastewater) and scholarship support for Shu-Hong Gao from the China Scholarship Council. We thank Dr. Beatrice Keller and Jianguang Li, University of Queensland for FIA analysis and Dr. Michael Nefedov, University of Queensland for assistance with the BD FACSAria™ II flow cytometer and data analysis.

Conflict of interest

The authors declare that they have no conflict of interest.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  1. 1.Advanced Water Management CentreThe University of QueenslandBrisbaneAustralia

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