Différences et similitudes des métabolites secondaires chez deux espèces du genreAllium, Allium roseumL. etAllium ampeloprasumL

Abstract

Différences et similitudes des métabolites secondaires chez deux espèces du genre Allium, Allium roseum L. et Allium ampeloprasum L.Résumé.-Ce travail a porté sur deux Allium spontanés prisés en raison de leur valeur alimentaire et leurs vertus thérapeutiques, A. roseum var. odoratissimum et A. ampeloprasum. Nous avons engagé un screening phytochimique de méta-bolites secondaires ainsi qu'une analyse qualitative de composés soufrés pré-curseurs des arômes d'Allium, les S-alk(en)yl cystéine sulfoxides. Les résultats montrent que ces espèces sont caractérisées par la présence de méthiine, alliine et isoalliine chez A. roseum, isoalliine et méthiine chez A. ampeloprasum. Ainsi A. roseum présente les caractéristiques aromatiques d'un ail spontané et A. ampeloprasum est plus proche d'un oignon. Les tests de caractérisation réa-lisés sur ces différents produits ont permis de mettre en évidence leur richesse en Abstract.-This study deals with the valorisation of medicinal and aromaticAllium to find new bioactive natural products. The phytochemical analyses of A. roseum and A. ampeloprasum powders and their aqueous and organic extracts are achieved. The results show that these species are characterized by the presence, among their components, of three precursors of organosulphurous volatile compounds. They are methiin, isoalliine and alliine in A. roseum and isoalliin and methiin in A. ampeloprasum. These differences in their flavours can correlated with the vicinity of A. roseum with garlic and A. ampeloprasum with onion. Phytochemical screening of Allium roseum shows the presence of active agents such as saponins, tannins, flavonoids, coumarins, steroids, cardiac glycosides, free quinone and iridoids.

Phytochemical screening and antimicrobial activities of almonds extracts from kernel of two mango (Mangifera indica L.) varieties grown in Korhogo (North of Ivory Coast)

“…A series of ten (10) test tubs were used to test each extract. Each set consists of eight (8) test tubes and two (2) control tubes, one without extract, used as a control for fungal growth (T) and the other, without germs or extract serving as a control for sterility (TS) of the culture medium [15,16]. The test tubs contain a range of decreasing extract concentration that varies from 50 mg/mL to 0.39 mg/mL describing a geometric sequence of reason 1/2.…”

Phytochemical screening and antioxidant activity of leaves of Amaranthus hybridus L., Corchorus olitorius L and Hibiscus sabdariffa L. grown in northen of Côte d’Ivoire

“…After migration and air dried of particles of different extracts, chromatographic plates were impregnated with Dragendorff reagent. The presence of orange stain in the plate revealed that the extract contains alkaloids [9][10][11] .…”