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Staphylococcal enterotoxin B: solid-phase radioimmunoassay.

H M Johnson, J A Bukovic, P E Kauffman

    Applied Microbiology
    |November 1, 1971
    PubMed
    Summary
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    A new radioimmunoassay accurately quantifies Staphylococcus aureus enterotoxin B. This sensitive and objective method uses (125)I-labeled enterotoxin B and antibody-coated tubes, offering a reliable tool for toxin detection.

    Area of Science:

    • Immunology
    • Microbiology
    • Analytical Chemistry

    Background:

    • Accurate quantification of bacterial toxins is crucial for food safety and clinical diagnostics.
    • Existing methods for enterotoxin B assay lack sensitivity and objectivity.
    • Staphylococcus aureus enterotoxin B is a significant foodborne pathogen.

    Purpose of the Study:

    • To develop a sensitive and objective immunoassay for quantifying Staphylococcus aureus enterotoxin B.
    • To evaluate the performance of the developed assay for both purified and crude enterotoxin B.
    • To establish a model for assaying other enterotoxin serotypes.

    Main Methods:

    • Development of a radioimmunoassay using (125)I-labeled enterotoxin B.
    • Coating of polystyrene tubes with specific antibodies against enterotoxin B.

    Related Experiment Videos

  • Competitive binding assay where unlabeled enterotoxin B competes with labeled enterotoxin B for antibody sites.
  • Measurement of radioactivity uptake to determine enterotoxin B concentration.

    • Main Results:

    • The immunoassay demonstrated sensitivity to 1-5 ng/ml for both purified and crude enterotoxin B.
    • The assay showed high specificity, with no interference from heterologous enterotoxins.
    • The radioimmunoassay provided objective and sensitive measurements of enterotoxin B concentration.

    Conclusions:

    • The developed radioimmunoassay is a sensitive, specific, and objective method for quantifying enterotoxin B.
    • This assay offers a significant improvement over current methods for enterotoxin detection.
    • The assay serves as a valuable model for developing similar assays for other enterotoxin serotypes.