Extraction et caractérisation des extraits cireux de graines de Jatropha curcas pour application biopesticide

Authors: Diakité, Abdoulaye
Advisor: Ratti, Cristina
Abstract: Jatropha curcas L. is a species found in almost all tropical regions. The seeds of Jatropha curcas contain oil that is suitable for biodiesel production and therefore has received global interest as a source of biofuel. However, so far Jatropha curcas has not reached its full potential. In addition to its use for biodiesel production, the development of other Jatropha seed by-products such as wax will add to the economic value of this plant. No detailed studies have been conducted on Jatropha seed wax performance and its uses in biopesticide production. The present study revealed that the wax yield of Jatropha seeds was 0.11%; 0.03% and 0.02% respectively for extraction methods using n-hexane, boiling water and liquid nitrogen. Differential scanning calorimetry analysis of the DSC thermograms shows that wax extracted with the hexane is more complex indicating the presence of several different compounds, compared to the waxes obtained by the other two methods. This is in agreement with the scanning electron microscope results which show less wax on the surface of hexane-treated Jatropha seeds compared to the other two solvents. The exploratory biological test carried out revealed that the waxy extracts should have some biocidal property. They induced 100% mortality of stage 4 Choristoneura fumiferana larvae at a concentration of 20%.
Document Type: Mémoire de maîtrise
Issue Date: 2018
Open Access Date: 7 December 2018
Permalink: http://hdl.handle.net/20.500.11794/32865
Grantor: Université Laval
Collection:Thèses et mémoires

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