Table of Contents
International Journal of Bacteriology
Volume 2014, Article ID 121367, 13 pages
http://dx.doi.org/10.1155/2014/121367
Research Article

Mixture of Sodium Hypochlorite and Hydrogen Peroxide on Adhered Aeromonas hydrophila to Solid Substrate in Water: Impact of Concentration and Assessment of the Synergistic Effect

1University of Yaoundé I, Laboratory of General Biology, Hydrobiology and Environment Research Unit, P.O. Box 812, Yaoundé, Cameroon
2Laboratoire “Microorganismes: Génome & Environnement”, UMR CNRS 6023, Université Blaise Pascal, Complexe Scientifique des Cézeaux, 24 avenue des Landais, BP 80026, 63171 Aubière Cedex, France

Received 28 August 2013; Revised 22 December 2013; Accepted 13 January 2014; Published 3 March 2014

Academic Editor: Rodrigo E. Mendes

Copyright © 2014 Chrétien Lontsi Djimeli et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The synergistic effects of the combined treatments of NaOCl and H2O2 on the elimination of A. hydrophila adhered to polythene under static and dynamic conditions were evaluated. The concentrations 0.1, 0.2, and 0.3 NaOCl and 0.5, 1, and 1.5 H2O2 were used. The contact periods were 180, 360, 540, and 720 minutes. The abundance of cells adhered reached 2.47 and 2.27 units (log (CFU/cm²)), respectively, under static and dynamic conditions after action of the mixture of disinfectants, whereas it reached 2.41 and 3.39 units (log (CFU/cm²)) after action of NaOCl and H2O2 alone, respectively. Increase in the incubation period resulted in a significant decrease in the abundance of cells adhered when the mixture of 0.3 NaOCl and 1.5 H2O2 was used ( ). For each cell growth phase, there was a significant difference amongst the mean densities of cells adhered after action of the mixture of disinfectants ( ). Although the Freundlich isotherm parameters relatively varied from one experimental condition to another, the value registered in the exponential growth phase was relatively higher in static state than in dynamic regime; cells adhered under dynamic condition seem more sensitive to the synergistic action than those adhered under static condition.