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  • Open Access


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

    Christ Stone Arnaud Bopenga Bopenga1, Henri Meyo Degboevi1, Kevin Candelier2, Prosper Edou Engonga3, Stéphane Dumarçay1, Marie France Thévenon2, Christine Gérardin Charbonnier1, Philippe Gérardin1,*

    Journal of Renewable Materials, Vol.9, No.1, pp. 17-33, 2021, DOI:10.32604/jrm.2021.013366


    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 agrochemical. Phytochemical screening revealed the presence of several groups of active molecules such as alkaloids, polyphenols, flavonoids, saponins and sterols and/or terpenes in the different extracts. Total phenols, condensed tannins and flavonoids contents corroborated phytochemical screening. Gas chromatography-mass spectrometry (GC-MS) analysis revealed compounds in dichloromethane extract different from those obtained with all the other solvents. Hexadecanoic and trans-9-octadecenoic acids, as well as stigmasterol and β-sitosterol

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  • Open Access


    Effect of Post-Added Water Amount on Pre-Concentrated Bark Foaming Materials by Mechanical Stirring

    Jinxing Li1,#, Jingjing Liao1,#, Jun Zhang1, Xiaojian Zhou1,2,*, Hisham Essawy3, Guanben Du1,2

    Journal of Renewable Materials, Vol.8, No.12, pp. 1607-1616, 2020, DOI:10.32604/jrm.2020.013976

    Abstract In this study, pre-concentrated bark, furfuryl alcohol and other biomass raw materials were used to prepare foaming materials by high-speed mechanical stirring without using a foaming agent. We investigated the effect of the postadded water amount on the properties of foaming materials. In particular, we determined basic physical properties of these materials, including the limiting oxygen index (LOI), porosity, thermal conductivity, thermogravimetric analysis, pore size distribution, and microstructure. The results of scanning electron microscopy (SEM) indicated that the pore size distribution was uniform and the pore size increased with increasing water volume. Thermogravimetric analysis (TG/… More >

  • Open Access


    Population biology of Elaeodendron transvaalense Jacq. in the presence of harvesting

    Tshisikhawe MP, MW Van Rooyen

    Phyton-International Journal of Experimental Botany, Vol.82, pp. 303-311, 2013, DOI:10.32604/phyton.2013.82.303

    Abstract Elaeodendron transvaalense Jacq. is one of the medicinal plant species commonly used by people in the Venda region. The species is known to treat a variety of diseases. It is widely used and important to traditional healers. Because of this, it found its way into the muthi markets, and it is among the seven most commonly traded plant species in the Venda region. This study investigated the impact of bark harvesting on the population structure of this species. The study revealed that although the level of bark harvesting is high, the species is able to resist More >

  • Open Access


    An evaluation of the extent and threat of bark harvesting of medicinal plant species in the Venda Region, Limpopo Province, South Africa

    Tshisikhawe MP1,2*, MW van Rooyen1, RB Bhat2

    Phyton-International Journal of Experimental Botany, Vol.81, pp. 89-100, 2012, DOI:10.32604/phyton.2012.81.089

    Abstract The medicinal flora of the Venda region consists of a variety of species, which may potentially provide therapeutic agents to treat different diseases. Bark use for medicinal purposes has been reported for approximately 30% of the woody species (153 species) in the Venda region in southern Africa. However, only 58 plant species are commonly harvested for the medicinal properties in their bark and found in muthi shops in the region. These 58 species were scored for the possible threat of bark harvesting to the plant survival. Ethnobotanical studies indicate that the growing trade in indigenous medicinal More >

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