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26 results on '"Eya’ane Meva, Francois"'

1. Anti-inflammation Study of Cellulose-Chitosan Biocomposite-Based Tetrapleura tetraptera (Taub) Dried Fruits Aqueous Extract

Author

Hzounda Fokou, Jean Baptiste, Nsegbe , Annick Christianne, Beglau, Thi Hai Yen, Fetzer, Marcus N. A., Mbogbe, Elise Nadia, Chameni Nkouankam, Jenna Maeva, Ngadie Mponge, Pamela, Ngo Yomkil Baleng, Marie Tryphene Magaly, Songue , Sylvie Pascale, Ninpa Kuissi, Chris Rosaire, Koube , Juliette, Sone Enone, Bertin, Ntoumba, Agnes Antoinette, Eya’ane Meva, Francois, and Janiak , Christoph

Published
2024
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4. Silver and palladium nanoparticles produced using a plant extract as reducing agent, stabilized with an ionic liquid: sizing by X-ray powder diffraction and dynamic light scattering

Author

Eya’ane Meva, Francois, Ntoumba, Agnes Antoinette, Belle Ebanda Kedi, Philippe, Tchoumbi, Edmond, Schmitz, Alexa, Schmolke, Laura, Klopotowski, Maximilian, Moll, Bastian, Kökcam-Demir, Ülkü, Mpondo Mpondo, Emmanuel Albert, Lehman, Leopold Gustave, and Janiak, Christoph

Published
2019
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5. Bead milling liberates the antioxidant properties of nanosized tubers of Vernonia guineensis Benth (Asteraceae)

Author

Eya'ane Meva, Francois, primary, Djomaha, Ludrice Dorence Yossa, additional, Nasim, Muhammad Jawad, additional, Ntoumba, Agnes Antoinette, additional, Kouemegne, Armelle Michelle Houatchaing, additional, Ottou, Patrice Brice Mvogo, additional, Loe, Gisele Etame, additional, Dibong, Siegfried Didier, additional, and Jacob, Claus, additional

Published
2023
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7. Anti-inflammation Study of Cellulose-Chitosan Biocomposite-Based Tetrapleura tetraptera(Taub) Dried Fruits Aqueous Extract

Author

Hzounda Fokou, Jean Baptiste, Nsegbe, Annick Christianne, Beglau, Thi Hai Yen, Fetzer, Marcus N. A., Mbogbe, Elise Nadia, Chameni Nkouankam, Jenna Maeva, Ngadie Mponge, Pamela, Ngo Yomkil Baleng, Marie Tryphene Magaly, Songue, Sylvie Pascale, Ninpa Kuissi, Chris Rosaire, Koube, Juliette, Sone Enone, Bertin, Ntoumba, Agnes Antoinette, Eya’ane Meva, Francois, and Janiak, Christoph

Abstract

Nanotechnology is making exceptional progress in the medical field. The development of new systems for the delivery of plant ingredients brings benefits such as good bioavailability, solubility, sustained release, and enhanced potential. To the best of our knowledge, there is no report on nanocomposites from Tetrapleura tetrapteradespite its wide range of ethnopharmacological uses including management of inflammatory diseases. This study aimed to prepare chitosan- and cellulose-based nanocomposites with anti-inflammatory potential. The biocomposites showed an encapsulation efficiency of 69.4%. Their formation was confirmed by a peak at 290 nm in UV–Vis. Infrared spectrophotometry proved the formation of a mixed polysaccharide and polyphenol system. No signs of toxicity and no deaths were found; therefore, the lethal dose 50 (LD50) is higher than 2000 mg/kg. The biocomposite has an anti-inflammatory activity in vitro with a maximum inhibition of 99.5% and an anti-inflammatory activity in vivo with a maximum inhibition of 98.7% for a dose of 200 mg/kg. The synthesized biocomposites from the aqueous extract of the fruits of Tetrapleura tetrapterashowed an anti-inflammatory property with satisfactory safety.

Published
2024
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9. Antimicrobial Properties of Strychnos phaeotricha (Loganiaceae) Liana Bark Secondary Metabolites at the Interface of Nanosilver Particles and Nanoencapsulation by Chitosan Transport Vehicles

Author

Tchangou Njiemou, Armel Florian, primary, Paboudam Gbambie, Awawou, additional, Fannang, Simone Veronique, additional, Vayarai Manaoda, Antoine, additional, Gvilava, Vasily, additional, Spieß, Alex, additional, Fonye Nyuyfoni, Gildas, additional, Mepoubong Kegne, Nelie Alida, additional, Ntoumba, Agnes Antoinette, additional, Belle Ebanda Kedi, Philippe, additional, Enone, Bertin Sone, additional, Ngolsou, Francis, additional, Sikapi Fouda, Jean Yves, additional, Avom Mbeng, Joel Olivier, additional, Nnange Akweh, Mesode, additional, Houatchaing Kouemegne, Armelle Michelle, additional, Yana, Daniel Aurelien, additional, Chimi, Geordamie, additional, Somba, Alex Vincent, additional, Deli, Vandi, additional, Nnanga Nga, Emmanuel, additional, Eya’ane Meva, Francois, additional, and Janiak, Christoph, additional

Published
2022
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10. Anti-inflammation and antimalarial profile of 5-pyridin-2-yl-1H-[1,2,4]triazole-3-carboxylic acid ethyl ester as a low molecular intermediate for hybrid drug synthesis

Author

Eya’ane Meva, Francois, primary, Prior, Timothy J., additional, Evans, David J., additional, Shah, Sachin, additional, Tamngwa, Cynthia Fake, additional, Belengue, Herschelle Guyenne Lagrange, additional, Mang, Roland Emmanuel, additional, Munro, Justin, additional, Qahash, Tarrick, additional, and Llinás, Manuel, additional

Published
2021
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16. Anti-inflammation and antimalarial profile of 5-pyridin-2-yl-1H-[1,2,4]triazole-3-carboxylic acid ethyl ester as a low molecular intermediate for hybrid drug synthesis.

Author

Eya'ane Meva, Francois, Prior, Timothy J., Evans, David J., Shah, Sachin, Tamngwa, Cynthia Fake, Belengue, Herschelle Guyenne Lagrange, Mang, Roland Emmanuel, Munro, Justin, Qahash, Tarrick, and Llinás, Manuel

Subjects
*ETHYL esters, *DRUG synthesis, *ASPIRIN, *NUCLEAR magnetic resonance spectroscopy, *OXALYL chloride, *INFRARED spectroscopy, *ELEMENTAL analysis
Abstract

A novel 1,2,4-triazole intermediate 5-pyridin-2-yl-1H-[1,2,4]triazole-3-carboxylic acid ethyl ester was prepared by the reaction of N'-aminopiridyne-2-carboximidamine and an excess monoethyl oxalyl chloride and screened for biological activities. The compound was structurally characterized by nuclear magnetic resonance spectroscopy, elemental analysis, infrared spectroscopy, and single-crystal X-ray diffraction. Bioassays indicated that the compound exhibits potent anti-inflammation activity in vitro. An egg albumin denaturation assay to assess the anti-inflammatory effect of the synthesized compound showed a significant inhibition of protein with a maximum inhibition of 71.1% at the highest tested concentration (1000 µg/mL) compared to 81.3% for Aspirin as standard drug. The antimalarial activity on the 3D7 P. falciparum strain was determined to be IC50 176 µM and was obtained prior to connection with pharmacophoric groups. [ABSTRACT FROM AUTHOR]

Published
2022
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18. Biosynthesis of Silver Nanoparticles from Microsorum Punctatum (L.) Copel Fronds Extract and an In-vitro Anti-Inflammation Study

Author

Belle Ebanda Kedi, Philippe, primary, Christian Nanga, Chick, additional, Paboudam Gbambie, Awawou, additional, Deli, Vandi, additional, Eya’ane Meva, Francois, additional, Elsayed Ahmed Mohamed, Hamza, additional, Antoinette Ntoumba, Agnes, additional, Julien Nko’o, Moise Henri, additional, Kökam-Demir, Ülkü, additional, Moll, Bastian, additional, Kouemegne Armelle Michelle, Houatchaing, additional, Teke Ndifon, Peter, additional, Albert Mpondo Mpondo, Emmanuel, additional, Dongmo, Alain Bertrand, additional, Maaza, Malik, additional, and Janiak, Christoph, additional

Published
2020
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19. Eco-friendly synthesis, characterization, in vitro and in vivo anti-inflammatory activity of silver nanoparticle-mediated Selaginella myosurus aqueous extract

Author

Belle Ebanda Kedi,Philippe, Eya'ane Meva,Francois, Kotsedi,Lebogang, Nguemfo,Edwige Laure, Bogning Zangueu,Calvin, Ntoumba,Agnes Antoinette, Mohamed,Hamza, Dongmo,Alain Bertrand, and Maaza,Malik

Subjects
International Journal of Nanomedicine
Abstract

Philippe Belle Ebanda Kedi,1,2 Francois Eya’ane Meva,3 Lebogang Kotsedi,2,4,5 Edwige Laure Nguemfo,6 Calvin Bogning Zangueu,1 Agnes Antoinette Ntoumba,1 Hamza Elsayed Ahmed Mohamed,2,4 Alain Bertrand Dongmo,1 Malik Maaza2,4 1Department of Animal Biology and Physiology, Faculty of Science, University of Douala, Douala, Cameroon; 2Nanosciences African Network (NANOAFNET), iThemba LABS-National Research Foundation, Somerset, South Africa; 3Department of Pharmaceutical Sciences, Faculty of Medicine and Pharmaceutical Sciences, University of Douala, Douala, Cameroon; 4UNESCO-UNISA Africa Chair in Nanosciences-Nanotechnology, College of Graduate Studies, University of South Africa, Pretoria, South Africa; 5Department of Physics, University of the Western Cape, Bellville, Cape Town, South Africa; 6Department of Biological Sciences, Faculty of Medicine and Pharmaceutical Sciences, University of Douala, Douala, Cameroon Introduction: There is emerging interest in medicinal plants in the biomedical field, due to their multitude of chemicals which show anti-inflammatory, antimicrobial, antiviral, or antitumoral potential. Research on medicinal plants has shown that nanotechnology could offer new solutions in the quality control, delivery aspects, or in sustaining herbal biological activities. This work reports on the preparation and characterization of silver nanoparticle-mediated Selaginella myosurus plant extract. Methods: Ultraviolet-visible spectroscopy, Fourier transform infrared spectroscopy, powder X-ray diffraction, energy dispersive X-ray spectroscopy, high-resolution scanning electron microscopy, high-resolution transmission electron microscopy, and selected area electron diffraction have been used to characterize the prepared silver nanoparticles. The synthetic stability was studied by varying concentrations and pH of reactants. Egg albumin denaturation and carrageenan-induced rat paw edema model were used to ascertain the anti-inflammation. Results: Ultraviolet-visible spectroscopy gave plasmon resonance ranging between 420 and 480 nm while Fourier transform infrared spectroscopy proved nano interface functionalized with organics. The powder X-ray diffraction pattern is in agreement with silver and silver chloride nanoparticles of crystallite size 33.7 nm and 44.2 nm for silver and silver chloride, respectively. Energy dispersive X-ray spectroscopy enables elemental characterization of the particles consisting of silver and silver chloride among main elements. Spherical silver grain of 58.81 nm average size has been depicted with high-resolution scanning electron microscopy and high-resolution transmission electron microscopy. Inhibitions of 99% and 60% were obtained in vitro and in vivo, respectively. Conclusion: The albumin denaturation and carrageenan-induced rat hind paw edema model to assess the anti-inflammatory potential of generated nanoparticles suggests that the silver nanoparticles may act as reducing/inhibiting agents on the release of acute inflammatory mediators. Hence, this work clearly demonstrated that silver nanoparticles mediated-Selaginella myosurus could be considered as a potential source for anti-inflammatory drugs. Keywords: eco-friendly synthesis, silver nanoparticles, Selaginella myosurus, anti-inflammatory

Published
2018

21. Natural Substances for the Synthesis of Silver Nanoparticles against Escherichia coli: The Case of Megaphrynium macrostachyum (Marantaceae), Corchorus olitorus (Tiliaceae), Ricinodendron heudelotii (Euphorbiaceae), Gnetum bucholzianum (Gnetaceae), and Ipomoea batatas (Convolvulaceae)

Author

Eya’ane Meva, Francois, primary, Okalla Ebongue, Cecile, additional, Fannang, Simone Véronique, additional, Segnou, Marcelle Loretta, additional, Ntoumba, Agnes Antoinette, additional, Belle Ebanda Kedi, Philippe, additional, Njike Loudang, Rudy-Evrard, additional, Yonga Wanlao, Andre, additional, Mang, Emmanuel Roland, additional, and Mpondo Mpondo, Emmanuel Albert, additional

Published
2017
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23. Magnetic superexchange interactions: trinuclear bis(oxamidato) versus bis(oxamato) type complexes

Author

Abdulmalic, Mohammad A., primary, Aliabadi, Azar, additional, Petr, Andreas, additional, Krupskaya, Yulia, additional, Kataev, Vladislav, additional, Büchner, Bernd, additional, Zaripov, Ruslan, additional, Vavilova, Evgeniya, additional, Voronkova, Violeta, additional, Salikov, Kev, additional, Hahn, Torsten, additional, Kortus, Jens, additional, Eya'ane Meva, Francois, additional, Schaarschmidt, Dieter, additional, and Rüffer, Tobias, additional

Published
2015
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24. Synthese mehrkerniger Komplexe mit Oxamato und Oxamidato Liganden

Author

Eya'ane Meva, Francois, Lang, Heinrich, Salvan, Georgeta, and Technische Universität Chemnitz

Subjects
Dünne Schicht, Kupfer, Bis(oxamato)-Komplexe, Bis(oxamidato)-Komplexe, Einkristallröntgenstrukturanalyse, Rotationsbeschichtung, Nickel, Magnetooptischer Kerr-Effekt, ddc:500, Cobalt, Ellipsometrie, Lithographie, Magnetismus
Abstract

Die vorliegende Arbeit befasst sich mit der Darstellung mono-, bi- und trimetallischer bis(oxamato) und bis(oxamidato) Übergangsmetallkomplexe, ihrer - insbesondere - magnetischen Charakterisierung, der Überführung trimetallischer Komplexe in dünne Filme im nm-Bereich mittels Rotationsbeschichtung auf Si/SiO2-Substraten, der Charakterisierung der Filme und magneto-optischen Untersuchungen der dünnen Filme. Durch gezielte Variation funktioneller Gruppen insbesondere der trimetallischen bis(oxamato)-Übergangsmetallkomplexe, wie der Verwendung variierter zentraler N,N’-Brücken, terminaler Liganden bzw. inkorporierter Übergangsmetallionen sollten nicht nur die physikalischen Eigenschaften modifiziert werden, sondern auch das Abscheideverhalten dieser Komplexe beim Überführen in dünne Filme.

Published
2009

25. Synthese mehrkerniger Komplexe mit Oxamato und Oxamidato Liganden

Author

Lang, Heinrich, Salvan, Georgeta, Technische Universität Chemnitz, Eya'ane Meva, Francois, Lang, Heinrich, Salvan, Georgeta, Technische Universität Chemnitz, and Eya'ane Meva, Francois

Abstract

Die vorliegende Arbeit befasst sich mit der Darstellung mono-, bi- und trimetallischer bis(oxamato) und bis(oxamidato) Übergangsmetallkomplexe, ihrer - insbesondere - magnetischen Charakterisierung, der Überführung trimetallischer Komplexe in dünne Filme im nm-Bereich mittels Rotationsbeschichtung auf Si/SiO2-Substraten, der Charakterisierung der Filme und magneto-optischen Untersuchungen der dünnen Filme. Durch gezielte Variation funktioneller Gruppen insbesondere der trimetallischen bis(oxamato)-Übergangsmetallkomplexe, wie der Verwendung variierter zentraler N,N’-Brücken, terminaler Liganden bzw. inkorporierter Übergangsmetallionen sollten nicht nur die physikalischen Eigenschaften modifiziert werden, sondern auch das Abscheideverhalten dieser Komplexe beim Überführen in dünne Filme.

Published
2009

26. Crystal structures of N '-amino-pyridine-2-carboximidamide and N '-{[1-(pyridin-2-yl)ethyl-idene]amino}-pyridine-2-carboximidamide.

Author

Eya'ane Meva F, Prior TJ, Evans DJ, and Mang ER

Abstract

The crystal structures of N '-amino-pyridine-2-carboximidamide (C 6 H 8 N 4 ), 1 , and N '-{[1-(pyridin-2-yl)ethyl-idene]amino}-pyridine-2-carboximidamide (C 13 H 13 N 5 ), 2 , are described. The non-H atoms in compound 1 are nearly planar (r.m.s. deviation from planarity = 0.0108 Å), while 2 is twisted about the central N-N bond by 17.8 (2)°. Both mol-ecules are linked by inter-molecular N-H⋯N hydrogen-bonding inter-actions; 1 forms a two-dimensional hydrogen-bonding network and for 2 the network is a one-dimensional chain. The bond lengths of these mol-ecules are similar to those in other literature reports of azine and di-imine systems.

Published
2017
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