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Theses

Études ethnobotaniques, et profils phytochimiques des plantes utilisées dans les soins bucco-dentaires au Bénin

Abstract : In Benin, the use of chewing sticks is a cultural practice to treat oral diseases. However, scientific data on their therapeutic potential are lacking. This study proposes to improve ethnobotanical, therapeutic and phytochemical knowledge of oral plants in Benin. To achieve this objective, we conducted an ethnobotanical survey of 1697 individuals, which allowed us to select ten plants: Zanthoxylum zanthoxyloides, Vitellaria paradoxa, Prosopis africana, Dialium guineense, Pseudocedrela kotschyi, Parkia biglobosa, Azadirachta indica, Diospyros mespiliformis, Anogeissus leiocarpa and Bridelia ferruginea. Then, a study was performed to evaluate their cytotoxicity and antibacterial activities. The results of the antibacterial test show that the largest inhibition diameters were obtained by the hydroethanol extracts of A. leiocarpa [25.67±0.04 mm on Escherichia coli ATCC 25922; 23.67±0.02 mm on Escherichia coli (clinical strain); 23.67±0.12 mm on Klebsiella pneumoniae (clinical strain)] and P. africana [20.33±0.62 mm on Escherichia coli ATCC 25922; 20.67±0.04 mm on Klebsiella pneumoniae (clinical strain); 21±1 on Escherichia coli (clinical strain)]. Quantitatively, the hydroalcoholic extract of Anogeissus leiocarpa bark yielded higher contents of polyphenols and total flavonoids than those of Prosopis africana bark. Subsequently, evaluation of antioxidant activity using the ABTS assay, hydroalcoholic extracts of Anogeissus leiocarpa barks (14.97±0.83 mg SD/gMS) showed higher antiradical power than Prosopis africana barks extracts (13.25±0.1 mg SD/gMS). Chromatographic analysis of the extracts of these two plants by LC-PDA/MS revealed that the two main flavonoids they contain are ellagic acid and quercetin.
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https://hal.univ-lorraine.fr/tel-03702428
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Submitted on : Thursday, June 23, 2022 - 10:03:06 AM
Last modification on : Friday, June 24, 2022 - 3:41:10 AM

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DDOC_T_2021_0272_GUEZODJE.pdf
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  • HAL Id : tel-03702428, version 1

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Tonahin Giscard Pépin Guezodje. Études ethnobotaniques, et profils phytochimiques des plantes utilisées dans les soins bucco-dentaires au Bénin. Chimie. Université de Lorraine; Université d'Abomey-Calavi (Bénin), 2021. Français. ⟨NNT : 2021LORR0272⟩. ⟨tel-03702428⟩

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