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Related Experiment Videos

Evaluation of the methods for enumerating coliform bacteria from water samples using precise reference standards.

T Wohlsen1, J Bates, G Vesey

  • 1Public Health Microbiology, Queensland Health Scientific Services, Coopers Plains, Brisbane, Qld, Australia. tracey_wohlsen@health.qld.gov.au

Letters in Applied Microbiology
|April 8, 2006
PubMed
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BioBall cultures precisely evaluated bacterial enumeration methods for water. Petrifilm and pour plate methods showed the most consistent results for quantifying Escherichia coli and coliforms.

Area of Science:

  • Microbiology
  • Water Quality Analysis
  • Food Safety

Background:

  • Accurate enumeration of Escherichia coli (E. coli) and coliforms in water is crucial for public health.
  • Standardized and reliable methods are needed for quality control in water testing.

Purpose of the Study:

  • To assess the efficacy of various bacterial enumeration methods using BioBall cultures as a reference standard.
  • To identify the most accurate and consistent methods for detecting E. coli and coliforms in water samples.

Main Methods:

  • Eight different methods were evaluated: membrane filtration, standard plate count (pour and spread), defined substrate technology (Colilert, Colisure), most probable number, and Petrifilm disposable plates.
  • BioBall cultures of E. coli and Enterobacter aerogenes, each containing 30 organisms, were used in 10 replicates for each method.

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  • Mean bacterial recovery rates were calculated for each method.

    • Main Results:

    • Significant variation in mean recovery of E. coli and E. aerogenes was observed across the evaluated methods.
    • The Petrifilm disposable plate method and the pour plate method yielded the most consistent and reliable results.
    • Other methods demonstrated either low recovery rates or high variability between replicates.

    Conclusions:

    • Petrifilm and pour plate methods are recommended for accurate and consistent enumeration of E. coli and coliforms in water.
    • BioBall cultures serve as an effective quality control tool for validating bacterial enumeration techniques in water analysis.