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Characterization of Extracts from the Bark of the Gabon Hazel Tree (Coula edulis baill) for Antioxidant,Antifungal and Anti-termite Products

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Journal of Renewable Materials 2021年第1期9卷 17-33页

作者： Christ Stone Arnaud Bopenga Bopenga Henri Meyo Degboevi Kevin Candelier prosper edou engonga Stéphane Dumarçay Marie France Thévenon Christine Gérardin Charbonnier Philippe Gérardin Universitéde Lorraine Institut National de Recherche pour l’Agriculturel’Alimentation et l’EnvironnementLaboratoire d’Etudes et de Recherche sur le Matériau BoisNancyFrance Universitéde Montpellier Centre de Coopération Internationale en Recherche Agronomique pour le Développement-Research Unit BiomassWoodEnergyBioproductsMontpellierFrance Multidisciplinary Laboratory of Sciences of Libreville Normal Superior SchoolLibrevilleGabon

Chemical composition of the bark extracts of Coula edulis was investigated to find potential antioxidant,anti-termite and antifungal compounds which can find useful applications in the fields of food,nutraceuticals,cosmetics or *** screening revealed the presence of several groups of active molecules such as alkaloids,polyphenols,flavonoids,saponins and sterols and/or terpenes in the different *** phenols,condensed tannins and flavonoids contents corroborated phytochemical *** chromatographymass spectrometry(GC-MS)analysis revealed compounds in dichloromethane extract different from those obtained with all the other *** and trans-9-octadecenoic acids,as well as stigmasterol andβ-sitosterol have been identified as the major compounds in the dichloromethane *** obtained with acetone and toluene/ethanol mixture(2/1,v/v)indicated the presence of few amounts of fatty acids and sugars,catechin in small amount and huge amounts of phenolic acids like gallic and ellagic *** radical 2,2-diphenyl-1-picrylhydrazyle(DPPH)and the cationic radical 2,2’-azinobis(3-ethylbenzothiazoline-6-sulfonic acid)(ABTS+)were used for evaluation of antioxidant properties of the different *** dichloromethane extracts had a very low antioxidant activity,while acetone and toluene/ethanol extracts presented EC50 values similar to those of catechin and BHT used as reference antioxidant *** of the different extracts of the bark of *** on fungal growth inhibition indicated better inhibition of the mycelium growth of brown rot fungi compared to white rot *** anti-termite activities were recorded with the aqueous extracts,while stronger activities were recorded with dichloromethane,acetone and toluene/ethanol extracts.

关键词： Antifungal antioxidant anti-termite Coula edulis baill extracts valorisation

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Phytochemical Study and Evaluation of the Antiradical Activity of Extracts of Oleaginous Seeds of Panda oleosa and Isolona hexaloba from Gabon

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Food and Nutrition Sciences 2022年第2期13卷 165-180页

作者： M.-A. N’negue ép Mezui-Mbeng Darina Medza prosper edou engonga Ognane Bikoro Lié Lyne Mengome Nestor Engone Abougone Sophie Laboratory of Chemistry-Biochemistry of the Faculty of Medicine University of Health Sciences Libreville Gabon Institute of de Pharmacopoeia and Traditional Medicine (IPHAMETRA) National Center for Scientific and Technical Research (CENAREST) Department of Phytochemistry Libreville-Gabon Pharmacopée et Médecine Traditionnelle (IPHAMETRA) Centre National de la Recherche Scientifique et Technique (CENAREST) Département de Phytochimie Libreville Gabon Ecole Normale Supérieure Department of Physical Sciences Laboratoire Pluridisciplinaire des Sciences (LAPLUS) Libreville Gabon

Our study focused on phytochemical tests and evaluation of the anti-free radical activity of seed extracts of two oleaginous plants from Gabon used in traditional medicine or as condiments: Panda oleosa and Isolona hexaloba. The extraction was carried out by maceration with solvents of increasing polarity: cyclohexane, trichloroethylene, acetone, ethanol and finally distilled water. The total yields of the extracts are about 69.50% for Panda oleosa and 34.28% for Isolona hexaloba. The phytochemical tests carried out on the extracts of the seeds of Panda and Isolona highlight in both seeds the presence of alkaloids, polyphenols, triterpenes, carotenoids, reducing compounds, flavonoids, total sugars, coumarins, anthraquinones, free quinones, free anthracene derivatives, and terpenoids. Isolona seeds also contain leucoanthocyanins, sterols, cardiac glycosides and saponins. Phytochemical tests revealed the absence of tannins and mucilage in both seeds. The free radical scavenging activity was measured by scavenging the free radical cation of 2,2’-azino-bis[3-ethylbenzothiazoline-6-sulfonic acid] (ABTS-+) with gallic acid as the reference antioxidant. The results of the free radical scavenging activity of the aqueous and ethanolic extracts of both seeds showed that the aqueous extracts were more active than the ethanolic extracts. The IC50s of the aqueous and ethanolic extracts of Panda seeds are 40 and 60 μg·mL-1 respectively, and those of the aqueous and ethanolic extracts of Isolona are 37.5 and 95 μg·mL-1 respectively. Gallic acid, the reference antioxidant (IC50 = 0.37 μg·mL-1) is about 10 times more active than the aqueous extracts of both seeds, 16 times more active than the ethanolic extract of Panda and 25 times more active than the ethanolic extract of Isolena.

关键词： Panda oleosa Isolona hexaloba Oleaginous Seeds Extracts Phytochemical Screening Antiradical Activity ABTS-+ Gallic Acid

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