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© Research
Publication : Journal of the American Mosquito Control Association

Assessment of A Simple Compound-Saving Method To Study Insecticidal Activity of Natural Extracts and Pure Compounds Against Mosquito Larvae

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in Journal of the American Mosquito Control Association - 01 Dec 2016

Falkowski M, Jahn-Oyac A, Ferrero E, Issaly J, Eparvier V, Girod R, Rodrigues AM, Stien D, Houël E, Dusfour I

Link to Pubmed [PMID] – 28206865

J. Am. Mosq. Control Assoc. 2016 Dec;32(4):337-340

Research on natural insecticides has intensified with the spread of resistance to chemicals among insects, particularly disease vectors. To evaluate compounds, the World Health Organization (WHO) has published standardized procedures. However, those may be excessively compound-consuming when it comes to assessing the activity of natural extracts and pure compounds isolated in limited amount. As part of our work on the discovery of new mosquito larvicides from Amazonian plants, we developed a compound-saving assay in 5-ml glass tubes instead of WHO larval 100-ml cups. Comparing activity of synthetic and natural chemicals validated the glass tube assay. Raw data, lethal doses that kill 50% (LD) and 90% (LD) at 24 and 48 h, were highly correlated (0.68 < R < 0.96, P < 0.001, Pearson test) between cups and tubes. It was also established that 10 tubes (N = 50 larvae) provided the same level of sensitivity as 20 tubes (N = 100). This method proved suitable for rapid screening of natural extracts and molecules, identifying active compounds using 10 times less material than in the WHO protocol.

https://www.ncbi.nlm.nih.gov/pubmed/28206865