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Antonie van Leeuwenhoek

, Volume 97, Issue 1, pp 91–97 | Cite as

Inactivation and injury of Escherichia coli in a copper water storage vessel: effects of temperature and pH

  • Riti Sharan
  • Sanjay Chhibber
  • Savita Attri
  • Robert H. Reed
Short Communication

Abstract

Copper has been used as a disinfectant since ancient times and recent research has demonstrated that antimicrobial copper surfaces may have practical applications in healthcare and related areas. The present study was carried out to establish the effects of temperature and pH on inactivation and sub-lethal injury of Escherichia coli in water stored in a copper vessel, to determine the operational limits of the process in terms of these variables. To investigate the effects of temperature, a bacterial suspension at pH 7.0 was stored for up to 48 h in copper vessels at 5, 15, 25 and 35°C. For pH, a bacterial suspension was stored at 30°C for up to 48 h in copper vessels at pH 6.0, 7.0, 8.0 and 9.0. Both temperature and pH had substantial effects on inactivation and injury, with the fastest inactivation observed at elevated temperature and at pH values furthest from neutrality, while the greatest amount of sub-lethal injury, manifest as sensitivity to conventional aerobic enumeration, was observed at a temperature of 35°C. These findings have important implications for the practical application of copper-based water disinfection methods, in terms of their likely efficacy under environmental conditions.

Keywords

Copper Water storage Disinfection Reactive oxygen species (ROS) Sub-lethal stress 

Abbreviations

WHO

World Health Organisation

US

United States

FNB

Food and nutrition board

CPCBI

Central pollution control board of India

EPA

Environmental protection agency

ROS

Reactive oxygen species

HEPES

4-(2-Hydroxyethyl)-1-piperazine ethanesulfonic acid

Notes

Acknowledgments

The authors thank the Copper Development Association, USA and Harold Michels for providing financial support for this research.

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Copyright information

© Springer Science+Business Media B.V. 2009

Authors and Affiliations

  • Riti Sharan
    • 1
    • 3
  • Sanjay Chhibber
    • 1
  • Savita Attri
    • 2
  • Robert H. Reed
    • 3
  1. 1.Department of MicrobiologyPanjab UniversityChandigarhIndia
  2. 2.Advanced Paediatric CentrePostgraduate Institute of Medical Education and ResearchChandigarhIndia
  3. 3.Centre for Plant & Water Science, Faculty of Sciences, Engineering and HealthCQ UniversityRockhamptonAustralia

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