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Related Experiment Videos

Results of the IPCS collaborative study on complex mixtures.

L D Claxton1, J Creason, B Leroux

  • 1U.S. Environmental Protection Agency, Research Triangle Park, NC 27711.

Mutation Research
|January 1, 1992
PubMed
Summary

This study assessed lab variations in bioassaying complex chemical mixtures using standard reference materials. Results showed consistent mutagenicity in air and diesel particulate samples across 20 global laboratories.

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Area of Science:

  • Environmental Chemistry
  • Toxicology
  • Analytical Chemistry

Background:

  • Assessing chemical mixtures requires standardized bioassay methods.
  • Inter-laboratory variation can impact the reliability of complex mixture analysis.
  • Standard Reference Materials (SRMs) offer a basis for comparative studies.

Purpose of the Study:

  • To evaluate intra- and inter-laboratory variability in preparing and bioassaying complex chemical mixtures.
  • To compare sonication and Soxhlet extraction techniques for particulate sample preparation.
  • To validate the Salmonella/mammalian microsome plate-incorporation assay for environmental samples.

Main Methods:

  • Utilized National Institute of Standards and Technology (NIST) Standard Reference Materials (SRMs).

Related Experiment Videos

  • Twenty international laboratories participated in a collaborative study.
  • Employed the Salmonella/mammalian microsome plate-incorporation assay (strains TA98 and TA100) on extracts of air and diesel particulate matter, coal tar, and control compounds (benzo[a]pyrene, 1-nitropyrene).

    • Main Results:

    • Mean extractable masses were ~5% for air particles and ~17.5% for diesel particles.
    • All particulate samples demonstrated mutagenicity in both TA98 and TA100 strains, with or without metabolic activation.
    • Mutagenicity slope values for diesel particles ranged from 3090 to 6697 revertants per mg particles (+S9).

    Conclusions:

    • The collaborative study demonstrated consistent mutagenicity findings for complex chemical mixtures across diverse laboratories.
    • The Salmonella/mammalian microsome assay is a robust method for detecting mutagenicity in environmental particulate samples.
    • Extraction techniques and bioassay procedures showed manageable variability, supporting the use of SRMs in such studies.