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Related Experiment Videos

Filtering out food debris before microbiological analysis

P I Peterkin, A N Sharpe

    Applied and Environmental Microbiology
    |July 1, 1981
    PubMed
    Summary
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    Sterile pipette filter tips effectively remove food debris for microbiological analysis without impacting bacterial recovery rates. This method ensures accurate enumeration of bacteria like Escherichia coli and Staphylococcus aureus.

    Area of Science:

    • Microbiology
    • Food Science
    • Analytical Chemistry

    Background:

    • Microbiological analysis of food samples often requires pre-treatment to remove particulate matter.
    • Debris can interfere with accurate bacterial enumeration and analysis.
    • Disposable pipette filter tips offer a potential solution for debris removal.

    Purpose of the Study:

    • To evaluate the efficacy of sterile disposable pipette filter tips in removing debris from diverse food matrices.
    • To determine if the use of these filter tips affects the recovery rates of target bacteria during microbiological analysis.

    Main Methods:

    • Utilized sterile disposable pipette filter tips with 111-microgram pore size polyethylene mesh.
    • Conducted 576 microbiological analyses across various food types including ground beef, chicken, cheeses, beans, rhubarb, and pot pies.

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  • Quantified recovery of Escherichia coli and Staphylococcus aureus.

    • Main Results:

    • Filter tips successfully removed interfering debris from food suspensions.
    • No significant reduction in bacterial recovery for Escherichia coli and Staphylococcus aureus was observed when using filter tips.
    • Consistent bacterial recovery across all tested food matrices was achieved.

    Conclusions:

    • Sterile disposable pipette filter tips are effective for pre-analytical debris removal in food microbiology.
    • The use of these filter tips does not compromise the accuracy of bacterial quantification.
    • This method provides a reliable approach for preparing food samples for microbiological testing.