9 research outputs found
Usages de poudres à base de rhizomes de Cochlospermum tinctorium Perrier ex A.Rich au Bénin : fréquence, formes et indications
Cochlospermum tinctorium est une plante mĂ©dicinale utilisĂ©e dans plusieurs pays pour le traitement de lâhĂ©patite. Au BĂ©nin, diffĂ©rentes poudres Ă base de ses rhizomes sont vendues dans les marchĂ©s et utilisĂ©es par les tradithĂ©rapeutes pour plusieurs usages. Lâobjectif de cette Ă©tude Ă©tait de rĂ©pertorier les diffĂ©rentes formes et les divers usages des recettes Ă base de Cochlospermum tinctorium utilisĂ©es au BĂ©nin. Dans ce sens, une enquĂȘte ethnomĂ©dicinale a Ă©tĂ© menĂ©e auprĂšs de 434 usagers des marchĂ©s et 40 tradithĂ©rapeutes du Sud et du Nord BĂ©nin suivant la mĂ©thode par interview semi-structurĂ©e. Les donnĂ©es obtenues ont montrĂ© que les recettes Ă base de C. tinctorium sont plus connues et utilisĂ©es au Nord-BĂ©nin. Ces recettes se prĂ©sentent sous trois formes (A, B et C). Leurs usages sont alimentaires (41%) et mĂ©dicinales (59%). La forme A est trĂšs utilisĂ©e (93,91%) par la population enquĂȘtĂ©e pour les besoins nutritionnels et thĂ©rapeutiques alors que les formes B et C ont, essentiellement, un usage mĂ©dicinal. Cette Ă©tude a permis de comprendre la diversitĂ© de recettes associĂ©es au terme "poudre jaune" au BĂ©nin. Il est dĂšs lors nĂ©cessaire dâĂ©valuer la toxicitĂ© et lâefficacitĂ© de ces diffĂ©rentes formes dâusage de la poudre de rhizome de C. tinctorium.
English title: Uses of rhizome-based powder of Cochlospermum tinctorium Perrier ex A.Rich in Benin: frequency, forms and indications
Cochlospermum tinctorium Perrier is a medicinal plant used in several countries for the treatment of hepatitis. In Benin, different powders made from its rhizomes are sold in markets and used by traditional healers for several purposes. The objective of this study was to list the different forms and uses of Cochlospermum tinctorium-based recipes used in Benin. An ethnomedicinal survey was conducted among 434 market users and 40 traditional healers from Southern and Northern Benin using the semi-structured interview method. The data obtained showed that the recipes based on C. tinctorium are more known and used in North Benin. These recipes come in three forms (A, B and C). Their uses are food (41%) and medicinal (59%). Form A is widely used (93.91%) by the population surveyed for nutritional and therapeutic needs while forms B and C have, essentially, a medicinal use. This study has allowed us to understand the diversity of recipes associated with the term "yellow powder" in Benin. It is therefore necessary to evaluate the toxicity and effectiveness of these different forms of use of C. tinctorium rhizome powder.
 
Undoped Layered Perovskite Oxynitride LiâLaTaâOâN for Photocatalytic COâReduction with Visible Light
Oxynitrides are promising visibleâlightâresponsive photocatalysts, but their structures are almost confined with threeâdimensional (3D) structures such as perovskites. A phaseâpure LiâLaTaâOâN with a layered perovskite structure was successfully prepared by thermal ammonolysis of a lithiumârich oxide precursor. LiâLaTaâOâN exhibited high crystallinity and visibleâlight absorption up to 500â
nm. As opposed to wellâknown 3D oxynitride perovskites, LiâLaTaâOâN supported by a binuclear Ru᎔᎔ complex was capable of stably and selectively converting COâ into formate under visible light (λ>400â
nm). Transient absorption spectroscopy indicated that, as compared to 3D oxynitrides, LiâLaTaâOâN possesses a lower density of midâgap states that work as recombination centers of photogenerated electron/hole pairs, but a higher density of reactive electrons, which is responsible for the higher photocatalytic performance of this layered oxynitride