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Valorisation du "Prosopis juliflora" comme alternative à la diminution des ressources forestières au Kenya

Abstract : The first part of the study was to evaluate technological wood properties of Prosopis juliflora growing in the semi-arid and arid land of Kenya. Heartwood is durable against all tested fungi and relatively resistant to termites. Heartwood extractives possess fungistatic and antitermitic properties. The wood of P. Juliflora is dimensionally stable with normal calorific, anatomical and mechanical characteristics but relatively high ash content and sapwood treatability. The second part of the study was to identify and characterise the chemical nature, antioxidant and antibacterial properties of extractives. Important amount ([approximately equal to] 8 %) and high purity of the rare flavonoid (-)-mesquitol was identified in heartwood extractives, while (+)-epicatechin, (+)-catechin, 4'-O-methylgallocatechins, fatty acids and free sugar are present in the bark. (-)-mesquitol like (+)-catechin is able to slow down oxidation of methyl linoleate induced by AIBN as well as inhibit the activities of DPPH radical. Heartwood extractives by different solvents presented higher antioxidant properties compared to bark and sapwood extractives suggesting that antioxidant properties could be at the origin of fungistatic properties. The crude acetonic heartwood extractives were able to inhibit the activities of E. faecalis (MIC [approximately equal to] 2.5mg/ml). Extractives of P. juliflora could therefore be of valuable interest as potential source of flavanols, which have been described as powerful antioxidants. Utilisation of P. juliflora extractives as additives in products where antioxidant, mild fungicidal and antibacterial properties are required such as cosmetics, soaps and shampoo could offer another way of valorization in addition to the use of wood which can remedy to the shortage of wood resources in Kenya and the negative effects associated with this species.
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Peter Kipkosgei Sirmah. Valorisation du "Prosopis juliflora" comme alternative à la diminution des ressources forestières au Kenya. Sylviculture, foresterie. Université Henri Poincaré - Nancy 1, 2009. Français. ⟨NNT : 2009NAN10035⟩. ⟨tel-01748475⟩

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