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Human dose-excretion studies with the pyrethroid insecticide, cypermethrin.

C V Eadsforth, M K Baldwin

    Xenobiotica; the Fate of Foreign Compounds in Biological Systems
    |February 1, 1983
    PubMed
    Summary

    A new method detects human exposure to cypermethrin by measuring its urinary metabolite, cyclopropanecarboxylic acid. This study confirms ester cleavage and excretion of this metabolite as a primary route for cypermethrin metabolism in humans.

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    Area of Science:

    • Environmental Chemistry
    • Toxicology
    • Human Metabolism Studies

    Background:

    • Cypermethrin is a widely used synthetic pyrethroid insecticide.
    • Understanding cypermethrin metabolism is crucial for assessing human exposure and health risks.
    • Previous studies indicated ester cleavage as a metabolic pathway in mammals.

    Purpose of the Study:

    • To develop and validate an analytical method for monitoring human exposure to cypermethrin.
    • To investigate the metabolic fate and urinary excretion of cypermethrin in humans.
    • To quantify the free and conjugated forms of the cyclopropanecarboxylic acid metabolite.

    Main Methods:

    • Development of an analytical method for detecting cyclopropanecarboxylic acid in urine.
    • Administration of single oral doses of cypermethrin (cis/trans mixture) to human subjects.

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  • Monitoring of urinary excretion of free and conjugated cyclopropanecarboxylic acid over 24 hours.

    • Main Results:

    • An effective analytical method for monitoring cypermethrin exposure via urinary metabolites was established.
    • Human subjects excreted a significant portion of the administered cypermethrin dose as cyclopropanecarboxylic acid within 24 hours.
    • Excretion rates were dose-dependent, with higher percentages of the trans isomer eliminated compared to the cis isomer.

    Conclusions:

    • Ester cleavage is a major metabolic pathway for cypermethrin in humans, similar to other mammals.
    • Urinary cyclopropanecarboxylic acid serves as a reliable biomarker for human cypermethrin exposure.
    • The developed analytical method provides a valuable tool for toxicological and epidemiological studies on cypermethrin.