Sextonia rubra (Mez.) van der Werff sawmills residues as a valuable resource for the production of larvicidal extracts against Ae. aegypti Linnaeus (Diptera: Culicidae)

Clervil Emmanuelle, Bossu Julie, Duchemin Jean-Bernard, Passelande Julien, Brunaux Olivier, Dusfour Isabelle, Amusant Nadine, Houël Emeline. 2023. Sextonia rubra (Mez.) van der Werff sawmills residues as a valuable resource for the production of larvicidal extracts against Ae. aegypti Linnaeus (Diptera: Culicidae). Industrial Crops and Products, 193:116162, 15 p.

Résumé : In the development of botanical insecticides, the availability of a certifiable raw material and the guarantee of a stable biological efficacy over time are crucial factors. Sextonia rubra is one of the main tree species exploited by the Guianese forestry industry, and the valorization of the large volumes of sawmills residues available would represent an opportunity for the sustainable development of bioactive products in a biorefinery perspective. In this work, we studied the variability of the quality of S. rubra sawdust according to its origin and investigated the bioactivity of its extracts against Ae. aegypti mosquitoes. We evidenced homogeneous physico-chemical prop- erties (particle size and NIRS profiles) of S. rubra sawdusts independently of the sawmill of origin, thus high- lighting the consistency of the raw material before extraction. The amount of the γ-lactones rubrenolide and rubrynolide was measured in 12 extracts of S. rubra by quantitative NMR (qNMR). GLM regression indicated significant correlation between these values and larval mortality (adj-R2 0.93) for the extracts tested at 30 μg/ml. Additionally, a 48-h DL50 of 18.6 μg/ml was obtained for a S. rubra reference extract. While sawdust underwent chemical changes during the 10 months of storage, as shown by NIRS and qNMR analyses, we observed no significant impact on larval mortality for the extracts tested at 30 μg/ml. A stability of 9-months was also observed for a crude extract stored at room temperature. Sawmill residues of S. rubra thus appear to be suitable raw material for the production of significant quantities of wood extracts containing larvicidal compounds against Ae. aegypti. Their stability over time also makes it possible to consider production routes that could be transferred to an industrial scale.

Mots-clés Agrovoc : spectroscopie infrarouge, propriété physicochimique, bois, composition chimique, larvicide, sciage de bois d'?uvre, déchet de bois, scierie, production forestière

Mots-clés géographiques Agrovoc : Guyane française, France

Mots-clés libres : Biorefinery, Circular economy, Botanical insecticides, Standardization, QNMR, NIRS

Agences de financement européennes : European Regional Development Fund

Projets sur financement : (GUF) Valorization of molecules from Sextonia rubra wood waste for the formulation of larvicidal products against the Aedes aegypti mosquito: effectiveness and selectivity

Auteurs et affiliations

• Clervil Emmanuelle, Institut Pasteur de Guyane française (GUF)
• Bossu Julie, Université de Guyane (GUF)
• Duchemin Jean-Bernard, Institut Pasteur de Guyane française (GUF)
• Passelande Julien, CIRAD-ES-UMR Ecofog (GUF)
• Brunaux Olivier, ONF (GUF)
• Dusfour Isabelle, Institut Pasteur (FRA)
• Amusant Nadine, CIRAD-ES-UMR Ecofog (GUF)
• Houël Emeline, CNRS (GUF) - auteur correspondant

Source : Cirad-Agritrop (https://agritrop.cirad.fr/610765/)

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