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Valorisations potentielles des substances extractibles et étude de la composition chimique en relation avec la durabilité naturelle du noisetier du Gabon, Coula edulis Baill.

Abstract : The general objective of this study was to enhance the quality of C. edulis wood while being on the lookout for new biocidal compounds that can be used in fields such as the food industry, cosmetics, wood preservation, etc… Several experiments have been carried out for this. The results of the study on the intra-tree variability of the chemical composition showed that only the extractive content varies considerably radially and axially, on the other hand that of the chemical composition remained relatively constant, with a slight decrease upwards. No significant difference in chemical composition was observed between the different logs. The results on the characterization and the various analyzes of extractives have shown that the extractives content varies with the part of the wood species studied, the solvent and the extraction method used. The extractives content in the bark are higher than in the heartwood and sapwood. Fatty acids such as hexadecanoic acid and trans-9-Octadecenoic acid and terpene compounds such as stigmasterol and β-Sitosterol have been identified as the majority of less polar extracts. Sugars and especially phenolic compounds such as gallic acid and ellagic acid have been identified as the majority of polar extracts. C.edulis wood has shown very good resistance to fungi and termites. The low-polar bark extract and all polar extracts have shown interesting and more important antifungal activities on brown rot fungi than on white rot fungi. The best anti-termite activities have been obtained with extracts from the bark of C. edulis. The best antioxidant activities were recorded with the polar extracts of the bark but especially with that of the heartwood of C. edulis which approximate the values of the antioxidant activities of catechin and BHT, used as positive controls in this study.
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Submitted on : Thursday, October 8, 2020 - 8:53:28 AM
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  • HAL Id : tel-02960875, version 1

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Christ Stone Arnaud Bopenga Bopenga. Valorisations potentielles des substances extractibles et étude de la composition chimique en relation avec la durabilité naturelle du noisetier du Gabon, Coula edulis Baill.. Chimie. Université de Lorraine, 2020. Français. ⟨NNT : 2020LORR0075⟩. ⟨tel-02960875⟩

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