Characterization of extracts from the bark of the Gabon hazel tree (Coula edulis baill) for antioxidant, antifungal and anti-termite products

Bopenga Bopenga Christ Stone Arnaud, Meyo Degboevi Henri, Candelier Kévin, Edou Engonga Prosper, Dumarçay Stéphane, Thévenon Marie-France, Gérardin Charbonnier Christine, Gérardin Philippe. 2021. Characterization of extracts from the bark of the Gabon hazel tree (Coula edulis baill) for antioxidant, antifungal and anti-termite products. Journal of Renewable Materials, 9 (1) : pp. 17-33.

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Abstract : Chemical composition of the bark extracts ofCoula eduliswas inves-tigated tofind potential antioxidant, anti-termite and antifungal compounds whichcanfind useful applications in thefields of food, nutraceuticals, cosmetics or agro-chemical. Phytochemical screening revealed the presence of several groups ofactive molecules such as alkaloids, polyphenols,flavonoids, saponins and sterolsand/or terpenes in the different extracts. Total phenols, condensed tannins andfla-vonoids contents corroborated phytochemical screening. Gas chromatography-mass spectrometry (GC-MS) analysis revealed compounds in dichloromethaneextract different from those obtained with all the other solvents. Hexadecanoicand trans-9-octadecenoic acids, as well as stigmasterol andβ-sitosterol have beenidentified as the major compounds in the dichloromethane extract. Extractsobtained with acetone and toluene/ethanol mixture (2/1, v/v) indicated the pre-sence of few amounts of fatty acids and sugars, catechin in small amount andhuge amounts of phenolic acids like gallic and ellagic acids. The radical 2,2-diphenyl-1-picrylhydrazyle (DPPH) and the cationic radical 2,2'-azinobis(3-ethyl-benzothiazoline-6-sulfonic acid) (ABTS+) were used for evaluation of antioxidantproperties of the different extracts. The dichloromethane extracts had a very lowantioxidant activity, while acetone and toluene/ethanol extracts presented EC50values similar to those of catechin and BHT used as reference antioxidant com-pounds. Effect of the different extracts of the bark ofC. edulison fungal growthinhibition indicated better inhibition of the mycelium growth of brown rot fungicompared to white rot fungi. Low anti-termite activities were recorded with theaqueous extracts, while stronger activities were recorded with dichloromethane,acetone and toluene/ethanol extracts.

Mots-clés Agrovoc : Extrait d'écorce, Antioxydant, Fongicide, Insecticide d'origine végétale

Mots-clés géographiques Agrovoc : Gabon

Mots-clés complémentaires : Coula edulis, anti-termites

Mots-clés libres : Antifungal, Antioxidant, Anti-termite, Coula edulis baill, Extracts, Valorization

Classification Agris : H20 - Plant diseases
H10 - Pests of plants
K50 - Processing of forest products

Champ stratégique Cirad : CTS 4 (2019-) - Santé des plantes, des animaux et des écosystèmes

Auteurs et affiliations

  • Bopenga Bopenga Christ Stone Arnaud, Université de Lorraine (FRA)
  • Meyo Degboevi Henri, Université de Lorraine (FRA)
  • Candelier Kévin, CIRAD-PERSYST-UPR BioWooEB (FRA) ORCID: 0000-0002-9328-8511
  • Edou Engonga Prosper, Ecole Normale Supérieure de Libreville (GAB)
  • Dumarçay Stéphane, Université de Lorraine (FRA)
  • Thévenon Marie-France, CIRAD-PERSYST-UPR BioWooEB (FRA)
  • Gérardin Charbonnier Christine, Université de Lorraine (FRA)
  • Gérardin Philippe, Université de Lorraine (FRA) - auteur correspondant

Source : Cirad-Agritrop (

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