A biological test to quantify pyrethroid in impregnated nets

Martin Thibaud, Chandre Fabrice, Chabi Joseph, Guillet P.F., Akogbeto Martin, Hougard Jean-Marc. 2007. A biological test to quantify pyrethroid in impregnated nets. Tropical Medicine and International Health, 12 (2) : 245-250.

Liste HCERES des revues (en SHS) : oui

Thème(s) HCERES des revues (en SHS) : Psychologie-éthologie-ergonomie

Résumé : First instar larvae of Aedes aegypti (L.) (Diptera: Culicidae) are very susceptible to deltamethrin, which kills all larvae at a very low dose (0.1 µg/l). Thus the sensitivity of this insect to detect that pyrethroid is in parts per billion, as obtained with most common chromatographic methods of analysis. Here we describe a biological test (BT) to quantify deltamethrin in long-lasting insecticidal nets (LLINs) by exposing first instar larvae of Ae. aegypti to serial extracted insecticide solutions from net samples. The deltamethrin concentration in the net was calculated at the doses killing 50% of larva, from the LC50 of deltamethrin (6.5 x 10-5 mg/l) and the dilution factor (DF50) of the extracted net solution. The pyrethroid quantification in LLINs after 0-25 washes with this BT was correlated with those obtained by direct chromatographic analysis (r2 = 0.84). This BT did not require sophisticated equipment and could be extended to other molecules and materials. It appeared accurate, robust, cheap and well adapted to the national malaria programmes as the eggs of Ae. aegypti might be used for some months. This method was adapted to provide an easy to use kit test for the quality control of LLINs in the field.

Classification Agris : H10 - Ravageurs des plantes

Champ stratégique Cirad : Axe 4 (2005-2013) - Santé animale et maladies émergentes

Auteurs et affiliations

• Martin Thibaud, CIRAD-CA-UPR Systèmes cotonniers (BEN) ORCID: 0000-0002-4915-4436
• Chandre Fabrice, IRD (FRA)
• Chabi Joseph, IRD (FRA)
• Guillet P.F., OMS (CHE)
• Akogbeto Martin, IRD (FRA)
• Hougard Jean-Marc, IRD (BEN)

Source : Cirad - Agritrop (https://agritrop.cirad.fr/536709/)

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