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Characterization and Quantification of Phenolic Compounds of Hydroethanolic Extracts and Fractions of Leaves Gnetum africanum (Welv.) and Gnetum buchholzianum (Engl.) (Gnetaceae)

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open Journal of Applied Sciences 2022年第7期12卷 1304-1318页

作者： Bertin Sone Enone Gisèle Marie-Marguerite Etame-Loe Charles Christian Ngoule Jean-Pierre Ngene Juliette Koube Lahngong Methodius Shinyuy Simone Véronique Fannang moïse henri julien nko’o Jean Baptiste Hzounda Fokou Hans Denis Bamal Celestine Magne Valdi Steve Djova Wilfred Ndogmo Tekapi Sandrine Sikadeu Josiane Etang Albert mouelle Sone Laboratory of Microbiology Immunology-Hematology and Morphological Sciences Doctoral Training Unit in Health Sciences Faculty of Medicine and Pharmaceutical Sciences University of Douala Douala Cameroon Department of Pharmaceutical Sciences Faculty of Medicine and Pharmaceutical Sciences University of Douala Douala Cameroon Department of Microbiology University of Yaounde I Yaounde Cameroon Chemistry Laboratory Faculty of Sciences University of Douala Douala Cameroon Department of Biology and plant organisms Faculty of Science Douala Cameroon

Research for bioactive molecules and not resistant to infectious agents remains topical for science. The total polyphenols (TPP) and total flavonoids (TFv) of the hydroethanolic extracts and fractions obtained were quantified according to the spectrophotometric method described in the literature using the Folin-Ciocalteu reagent and the colorless solutions of sodium nitrite 2.5% and aluminum chloride 10% respectively. The characterization of chemical compounds was made by coupling liquid chromatography (LC) and mass spectroscopy (MS). Thus, 15 chemical compounds were characterized, seven from Gnetum africanum (EBa) and eight from Gnetum buchholzianum (EBb). The majority of which were stilbens, such as Gnetupendin D, Dimethoxygnetulin, Methoxyparvifolol D, Isorhaponcitin from Eba and Gnetuhaidin P, Gnetupendin D, Gnetuhainin C, phenols (Alcohol Homovanillyl, Alcohol Erythro guaiacylglycerol-β-o-4'-coniferyl, and Alcohol Homovanillyl from EBb. The minority were flavonoids such as Dimethoxydihydropyraneriodictyol, Dimethoxyeriodictyol (EBa) and Dimethoxydihydropyraneriodictyol, Trimethoxyluteolin (EBb). The levels of total polyphenolics and total flavonoids content were respectively 14.520 ± 0.557 mg EAA/g Extract and 29.870 ± 2.485 mg EQ/g Extract for EBa. The levels of total polyphenolics and total flavonoids content for EBb were respectively 4.560 ± 0.010 mg EAA/g Extract and 2.233 ± 0.251 mg EQ/g Extract. The high levels of flavonoids content respectively 220.200 ± 35.500 and 335.300 ± 57.810 mg EQ/g Extract were shown in Dichlorometan fraction from EBa and EBb. These bioactive compounds identified and total phenolics compounds quantified can be exploited in pharmacological and pharmacokinetical activities to fight against multi-resistant infectious agents and as well as oxidative stress and antiinflammatory diseases.

关键词： Gnetum africanum Gnetum buchholzianum Phenolic Compounds Liquid Chromatography Mass Spectroscopy

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Stachytarpheta cayennensis Aqueous Extract,a New Bioreactor towards Silver Nanoparticles for Biomedical Applications

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Journal of Biomaterials and Nanobiotechnology 2019年第2期10卷 102-119页

作者： Francois Eya’ane Meva Joel olivier Avom Mbeng Cecile okalla Ebongue Carsten Schlusener Ulku Kokcam-Demir Agnes Antoinette Ntoumba Phillipe Belle Ebanda Kedi Etienne Elanga Evrard-Rudy Njike Loudang moise henri julien nko’o Edmond Tchoumbi Vandi Deli Christian Chick Nanga Emmanuel Albert Mpondo Mpondo Christoph Janiak Department of Pharmaceutical Sciences Faculty of Medicine and Pharmaceutical SciencesUniversity of DoualaDoualaCameroon Institute for Inorganic Chemistry and Structural Chemistry Heinrich-Heine-University DusseldorfDusseldorfGermany Clinical Biology Laboratory General Hospital of DoualaDoualaCameroon Department of Animal Biology and Physiology Faculty of ScienceUniversity of DoualaDoualaCameroon

This study reports the preparation and characterization of silver nanoparticles synthesized by the mediation of the plant weed Stachytarpheta cayennensis through solution method. Ultraviolet visible spectroscopy (UV-Vis) determines the presence of nanoparticles in the solution. Infrared spectroscopy (IR) proves organic molecules at the particles interface. Powder X-ray diffraction (PXRD) provides phase composition and crystallinity. Shape was showed by scanning electron microscopy (seM), and energy dispersive X-ray spectroscopy (EDX) demonstrated the elemental mapping of the silver nanoparticles. Hydrogen peroxide scavenging and phosphomolybdenum antioxidant assays, egg albumin denaturation anti-inflammation study, and the formation mechanism complete the study. The particles have been found composed of pure silver Ag and silver chloride AgCl nanocrystallites. The average crystallite sizes were found to be 13 nm and 20 nm for Ag and AgCl respectively. A Rietveld refinement based XRD pattern data followed by Williamson-Hall plot allows a size and strain analysis. Based on seM, spherical agglomerates materials were formed and EDX proved the presence of Cl- ions. The reaction formation mechanism of Ag and AgCl is proposed to be simultaneous and competitive. The silver nanoparticles moderately inhibit the denaturation of egg albumin and exhibit antioxidant action;hence, the nanoparticles could be considered as a potential source for biomedical applications.

关键词： Silver Nanoparticles Stachytarpheta cayennensis Size and Strain Anti-oxidant Anti-Inflammation

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