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Related Experiment Videos

Enzyme-linked immunosorbent assay for the pyrethroid permethrin.

G Shan1, W R Leeman, D W Stoutamire

  • 1Department of Entomology and Department of Civil and Environmental Engineering, University of California, Davis, California 95616, USA.

Journal of Agricultural and Food Chemistry
|September 20, 2000
PubMed
Summary

A new competitive enzyme-linked immunosorbent assay (ELISA) was developed for detecting permethrin, a common pesticide. This sensitive immunoassay is valuable for environmental monitoring and toxicological studies.

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Area of Science:

  • Environmental Chemistry
  • Analytical Chemistry
  • Toxicology

Background:

  • Permethrin is a widely used pyrethroid insecticide in agriculture and public health.
  • Accurate detection methods are crucial for environmental monitoring and risk assessment.

Purpose of the Study:

  • To develop and validate a competitive enzyme-linked immunosorbent assay (ELISA) for the sensitive detection of permethrin.
  • To assess the assay's performance, including sensitivity, specificity, and applicability to environmental samples.

Main Methods:

  • Synthesis and conjugation of permethrin isomers (trans- and cis-) with thyroglobulin to create immunogens.
  • Generation and screening of antisera against various coating antigens.
  • Optimization of assay conditions, including solvent, pH, and ionic strength.

Related Experiment Videos

  • Validation of the developed ELISA using gas chromatography-mass spectrometry (GC-MS) on fortified river water samples.

    • Main Results:

    • The developed ELISA demonstrated an I(50) value of 2.50 microg/L, indicating high sensitivity.
    • The assay exhibited low cross-reactivity with other major pyrethroids.
    • Methanol (40% v/v) was identified as the optimal solvent, with stable performance across pH 5.0-8.0.
    • Assay performance was unaffected by ionic strength up to 0.2 M PBS, with higher concentrations suppressing absorbance.

    Conclusions:

    • The developed competitive ELISA is a sensitive and specific method for permethrin detection.
    • The immunoassay is suitable for environmental monitoring and toxicological studies, capable of detecting permethrin at parts per trillion levels.
    • The method shows good recovery and correlation with GC-MS validation, highlighting its practical utility.