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Automatic diluter for bacteriological samples.

P A Trinel, P Bleuze, G Leroy

    Applied and Environmental Microbiology
    |February 1, 1983
    PubMed
    Summary
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    This study introduces an automated apparatus for aseptic sample dilutions, offering programmable serial 10-fold dilutions. The system proved as accurate and reproducible as manual methods for microbial analysis.

    Area of Science:

    • Microbiology
    • Laboratory Automation
    • Analytical Chemistry

    Background:

    • Accurate serial dilutions are crucial for microbial quantification.
    • Manual dilution methods are labor-intensive and prone to error.
    • Aseptic techniques are essential to prevent contamination during sample preparation.

    Purpose of the Study:

    • To develop and evaluate an automated apparatus for aseptic serial dilutions.
    • To assess the accuracy and reproducibility of the automated system.
    • To optimize sterilization conditions for the automated dilution needle.

    Main Methods:

    • An apparatus with 190 tubes was utilized for automated dilutions.
    • Programmable serial 10-fold dilutions (10⁻¹ to 10⁻⁹) were performed.

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  • Assays involved liquid or suspended-solid samples, including Escherichia coli and Bacillus stearothermophilus.

    • Main Results:

    • Efficient needle sterilization conditions were successfully defined.
    • The automated dilution system demonstrated high accuracy.
    • The reproducibility of automated dilutions matched rigorous conventional methods.

    Conclusions:

    • The automated apparatus provides a reliable and efficient method for aseptic serial dilutions.
    • This system offers an alternative to manual dilutions, improving consistency and reducing labor.
    • The technology is suitable for microbial analysis and other applications requiring precise sample preparation.