Response surface modelling for cleaning and disinfecting materials used in milking systems with electrolysed oxidizing water

Stephen P. Walker, Ali Demirci, Robert E. Graves, Stephen B. Spencer, Robert F. Roberts

Research output: Contribution to journalArticle

30 Scopus citations


Electrolysed oxidizing (EO) water is produced bypassing a DC current through a weak sodium chloride solution, resulting in alkaline and acidic EO water. The goal of this research was to determine whether EO water could be used as an acceptable cleaning and disinfecting agent for materials used in pipeline milking systems. Small pieces of materials commonly used in milking systems were soiled using raw milk inoculated with a cocktail of four bacterial cultures similar to those commonly found in raw milk, and then cleaned by soaking in alkaline EO water followed by soaking in acidic EO water at various treatment times and temperatures. Effective treatment time and temperature combinations were determined by response surface design for a temperature range of 25-60°C and a time range of 5-20 min. Treated materials were evaluated by aerobic plate counts and A TP bioluminescence to assess the disinfecting and cleaning effectiveness of EO water. Most of the treatments at 60°C and several treatments at lower temperatures successfully removed all detectable bacteria and ATP. Overall, the results of this study indicated that EO water has the potential to be used as a cleaning and disinfecting agent for materials used in milking systems.

Original languageEnglish (US)
Pages (from-to)65-73
Number of pages9
JournalInternational Journal of Dairy Technology
Issue number2
Publication statusPublished - May 1 2005


All Science Journal Classification (ASJC) codes

  • Food Science
  • Bioengineering
  • Process Chemistry and Technology

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