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Related Experiment Videos

A simple field test for detecting pyrethroids on impregnated nets

P Verlé1, N T Ruyen, N T Huong

  • 1Institute for Tropical Medicine, Antwerp, Belgium.

Tropical Medicine & International Health : TM & IH
|November 11, 1998
PubMed
Summary

A modified Beilstein method reliably detects permethrin on bednets, offering high sensitivity even at low doses. This simple, cost-effective test is valuable for monitoring insecticide-treated net (ITN) programs in vector control.

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Area of Science:

  • Entomology
  • Public Health
  • Analytical Chemistry

Background:

  • Insecticide-treated nets (ITNs) are crucial for malaria vector control.
  • Accurate monitoring of insecticide levels on ITNs is essential for program effectiveness.
  • Existing detection methods may not be suitable for field deployment.

Purpose of the Study:

  • To evaluate a modified Beilstein method for detecting pyrethroids on bednets.
  • To assess the method's viability as a standardized field test.
  • To determine its reliability across different permethrin doses and net conditions.

Main Methods:

  • Laboratory testing of a modified Beilstein method using permethrin (50 EC).
  • Assessment of sensitivity with varying permethrin concentrations (0.5 g/m2 down to 0.1 g/m2).

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  • Evaluation of performance on unwashed and untreated bednets.

    • Main Results:

    • Near 100% sensitivity at recommended permethrin doses (0.5 g/m2), even with limited sample size and extraction time.
    • High sensitivity (80-95%) maintained down to 0.1 g active ingredient/m2 on unwashed nets.
    • Low false positive rates (0-2%) on untreated nets.

    Conclusions:

    • The modified Beilstein method is a sensitive and reliable tool for detecting permethrin on bednets.
    • Its simplicity, low cost, and ease of use make it suitable for field application in vector control programs.
    • The Lot Quality Assurance Sampling method can be integrated for monitoring impregnation campaigns.