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Related Experiment Videos

Collaborative study comparing the spiral plate and aerobic plate count methods.

J E Gilchrist, C B Donnelly, J T Peeler

    Journal - Association of Official Analytical Chemists
    |July 1, 1977
    PubMed
    Summary
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    The spiral plate count method offers a cost-effective, semiautomated alternative to traditional pour plating. This study found it comparable in accuracy for food and cosmetic microbiology, leading to its adoption as an official method.

    Area of Science:

    • Microbiology
    • Food Science
    • Cosmetic Science

    Background:

    • Traditional pour plating is labor-intensive and costly.
    • Microbiological analysis requires efficient and accurate plating techniques.

    Purpose of the Study:

    • To compare the spiral plate count method with the pour plating technique.
    • To evaluate the spiral plate method's accuracy and efficiency in microbiological analysis.

    Main Methods:

    • Collaborative study involving 8 laboratories.
    • Comparison of spiral and pour plating techniques using 3 product types (frozen pies, shampoo).
    • Statistical analysis of plating method means and variance components.

    Main Results:

    • 10 out of 12 comparisons showed no significant difference between spiral and pour plating methods.

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  • Variance components were lower than the current milk standard.
  • Replicate coefficient of variation was satisfactory, indicating reliability.

    • Conclusions:

    • The spiral plate method is a viable and acceptable alternative to the pour plate method.
    • The spiral plate method demonstrates efficiency and accuracy for microbiological testing.
    • Official adoption signifies its reliability and practical utility in laboratory settings.