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Related Experiment Videos

The International Standard for Endotoxin: evaluation in an international collaborative study.

S Poole1, M V Mussett

  • 1National Institute for Biological Standards and Control, Hertfordshire, UK.

Journal of Biological Standardization
|April 1, 1989
PubMed
Summary

A new bacterial endotoxin standard (84/650) was established as the International Standard for Endotoxin for Limulus Gelation Tests. This standard provides a unitage of 14,000 IU per ampoule for global use.

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Area of Science:

  • Microbiology
  • Immunology
  • Pharmacology

Background:

  • Bacterial endotoxins are critical components of Gram-negative bacteria.
  • Accurate quantification of endotoxins is essential for pharmaceutical safety and research.
  • Existing standards require international harmonization for reliable testing.

Purpose of the Study:

  • To evaluate a candidate preparation (84/650) for its suitability as the International Standard for Endotoxin.
  • To calibrate the candidate standard against the USA National Standard (EC5).
  • To establish a globally recognized standard for endotoxin testing.

Main Methods:

  • Multicenter international collaborative study involving 35 laboratories across 12 countries.
  • Calibration using Limulus Amoebocyte Lysate (LAL) assays: gelation, turbidimetric, and chromogenic tests.

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  • Inclusion of rabbit pyrogen tests for comprehensive evaluation.

    • Main Results:

    • Preparation 84/650 demonstrated suitability for international standardization.
    • Consistent results were obtained across various LAL assay formats and in vivo pyrogen tests.
    • The preparation was authorized by the World Health Organization's Expert Committee on Biological Standardization.

    Conclusions:

    • Preparation 84/650 was established in 1986 as the International Standard for Endotoxin for Limulus Gelation Tests.
    • An assigned unitage of 14,000 IU of endotoxin per ampoule was determined.
    • This standard facilitates global consistency and accuracy in endotoxin quantification.