Supported by a KOSEF SRC grant funded by the Korea government (MOST) (R11-2007-040-02001-0).
Effects of a Low Concentration Hypochlorous Acid Nasal Irrigation Solution on Bacteria, Fungi, and Virus†
Article first published online: 2 JAN 2009
Copyright © 2008 The Triological Society
Volume 118, Issue 10, pages 1862–1867, October 2008
How to Cite
Kim, H. J., Lee, J.-G., Kang, J. W., Cho, H.-J., Kim, H. S., Byeon, H. K. and Yoon, J.-H. (2008), Effects of a Low Concentration Hypochlorous Acid Nasal Irrigation Solution on Bacteria, Fungi, and Virus. The Laryngoscope, 118: 1862–1867. doi: 10.1097/MLG.0b013e31817f4d34
- Issue published online: 2 JAN 2009
- Article first published online: 2 JAN 2009
- Manuscript Accepted: 8 MAY 2008
- Hypochlorous acid;
- nasal irrigation
Objectives/Hypothesis: Saline irrigation would be more effective for chronic sinusitis patients if it had bactericidal effects. Low concentrations of hypochlorous acid may be used as a nasal irrigation solution. First, we developed a 0.85% NaCl solution by adding NaCl to tap water (pH 7.0 and 8.4) and measuring the concentration of free chlorine and hypochlorous acid after giving the solution a short electrical impulse of 20 seconds. Then we investigated whether the derived hypochlorous acid had a toxic effect on human primary nasal epithelial cells, if and what effect it had on the expression of mucin genes, and, finally, if it had bactericidal, fungicidal, or virucidal effects.
Study Design: In vitro biochemical experiment.
Methods: We treated human primary nasal epithelial cells with 3.5 ppm of hypochlorous acid and then examined the cells for cytotoxicity. We also investigated the bactericidal, fungicidal, and virucidal effects by challenging the cells with the following microorganisms Aspergillus fumigatus,Haemophilus influenzae,Klebsiella pneumoniae,Rhizopus oryzae,Candida albicans, Methicillin-resistant Staphylococcus aureus,Streptococcus pneumoniae, and Streptococcus pyogenes. To study the virucidal effects of HOCl, we used the human influenza A virus to challenge the cells.
Results: In the cytotoxicity assay and in the morphological examination, the cells did not show anytoxicity at 30 minute or 2 hours after treatment with HOCl. More than 99% of bactericidal or fungicidal activity was noted for all species, except for Candida albicans, in tap water at either pH 7.0 or 8.4. In addition, a 3.2-log10 reduction was achieved in cells challenged with the human influenza A virus.
Conclusions: A low concentration HOCl solution can be used as an effective nasal irrigation solution.