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Related Experiment Videos

A biological test to quantify pyrethroid in impregnated nets.

T Martin1, F Chandre, J Chabi

  • 1Centre de Recherche Entomologique de Cotonou, Benin. thibaud.martin@cirad.fr

Tropical Medicine & International Health : TM & IH
|February 16, 2007
PubMed
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A new biological test effectively quantifies deltamethrin in long-lasting insecticidal nets (LLINs) using Aedes aegypti larvae. This accurate, low-cost method aids quality control for malaria prevention programs.

Area of Science:

  • Medical Entomology
  • Analytical Chemistry
  • Public Health

Background:

  • Deltamethrin is a key insecticide in long-lasting insecticidal nets (LLINs) for malaria control.
  • Accurate quantification of deltamethrin in LLINs is crucial for assessing efficacy, especially after washing.
  • Existing chromatographic methods require sophisticated equipment, limiting field application.

Purpose of the Study:

  • To develop and validate a simple biological test (BT) for quantifying deltamethrin in LLINs.
  • To assess the BT's accuracy, robustness, and suitability for field use in quality control of LLINs.

Main Methods:

  • Utilized first instar larvae of Aedes aegypti, known for high deltamethrin susceptibility.
  • Exposed larvae to serial dilutions of deltamethrin extracted from LLIN samples.

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  • Calculated deltamethrin concentration based on LC50 and dilution factor, correlating results with chromatographic analysis.

    • Main Results:

    • The biological test demonstrated high sensitivity, detecting deltamethrin in parts per billion.
    • Results from the BT showed strong correlation (r² = 0.84) with direct chromatographic analysis after up to 25 washes.
    • The method proved accurate, robust, and cost-effective.

    Conclusions:

    • The developed biological test offers a reliable, field-adaptable alternative for deltamethrin quantification in LLINs.
    • This low-cost, equipment-independent method is well-suited for national malaria control programs.
    • The test can be adapted into an easy-to-use kit for routine quality control of LLINs.