1,721,006 research outputs found
FIG. 5. — Cartographie connue d in Découverte d'Allium cyrilli Ten. et actualisation de la section Melanocrommyum Webb & Berthel. (Amaryllidaceae) en Algérie et au Maghreb
No full textFIG. 5. — Cartographie connue d'Allium cyrilli Ten. en Algérie et au Maghreb: observations postérieures à 2002 (présent travail).Published as part of Véla, Errol, Rebbas, Khellaf, Moulay-Meliani, Khadidja & Tison, Jean Marc, 2021, Découverte d'Allium cyrilli Ten. et actualisation de la section Melanocrommyum Webb & Berthel. (Amaryllidaceae) en Algérie et au Maghreb, pp. 205-215 in Adansonia (3) 43 (18) on page 212, DOI: 10.5252/adansonia2021v43a18, http://zenodo.org/record/553488
The chemical composition of the aerial parts’ essential oil of Limonium lobatum (L.f.) Chaz. growing wild in Algeria
No full textThe Limonium genus (Plumbaginaceae) includes several species of perennial herbs and shrubs belonging to a particular type of halophytes, known as 'recretohalophytes'. Limonium species are widely distributed in the Mediterranean region, mainly in the North-Eastern and Southern countries and several bioactivities have been well documented. In the present study, the chemical composition of the essential oil (EO) of the aerial parts of Limonium lobatum (L.f.) Chaz., a species never chemically previously studied and collected in Algeria, which grows in South Spain, North Africa, and SW Asia, was analysed using GC-MS. The main constituents of the EO were monoterpenes involving eucalyptol (14.21%), beta-pinene (8.62%), beta-myrcene (8.18%). Among the sesquiterpene compounds beta-caryophyllene (8.94%) was the major one. The chemical profile of the EO presented here was compared with the EOs of previously investigated Limonium taxa. Furthermore, a complete literature review on the ethno-pharmacological uses of Limonium species was performed.[GRAPHICS]
The chemical composition of the essential oils of two Mediterranean species of Convolvulaceae: Convolvulus althaeoides subsp. tenuissimus collected in Sicily (Italy) and Calystegia silvatica collected in Algeria
No full textConvolvulus L. and Calystegia R.Br. are two closely related genera of the Convolvulaceae family distributed in Asia, Mediterranean, Macaronesia, East Africa, and Arabia, including about 210 and 30 accepted species, respectively, of flowering plants, present as trees, shrubs, and herbs. The ethnomedical use of Convolvulus species dates to 1730s as they displayed profuse medicinal properties. In the present study, the not previously investigated chemical compositions of the essential oils from aerial parts of Convolvulus althaeoides subsp. tenuissimus (Sm.) Bat., collected in Sicily, and Calystegia sylvatica (Kit.) Griseb., collected in Algeria, were evaluated by GC-MS. The main components of the essential oil of the first one were β-caryophyllene (28.68%), γ-muurolene (23.75%), and γ-elemene (17.55%), whereas the C. silvatica essential oil was shown to be rich of valeranone (10.77%), viridiflorol (9.45%), and germacrene D (8.61%). Furthermore, a complete literature review on the ethno-pharmacological uses of Convolvulus and Calystegia species was performed
Phytochemical investigation of Volutaria lippii and evaluation of the antioxidant activity
No full textVolutaria lippii (L.) Cass. ex Maire, syn. Centaurea lippii (L.), (Asteraceae) is a plant from the central region of Algeria, considerably distributed in all Mediterranean areas. Herein, the antioxidant activity of the three derived fractions [chloroform (CHCl3), ethyl acetate (EtOAc) and n-butanol (n-BuOH)] of the 70% methanol extract of the aerial parts (leaves and flowers), was assessed by using CUPRAC, ABTS, DPPH free radical scavenging, and beta-carotene bleaching methods. The results obtained allowed to guide the fractionation of EtOAc and n-BuOH fractions by CC followed by purification by TLC and reverse phase HPLC. A guaianolide glucoside, 3 beta-hydroxy-11 beta,13-dihydrodehydrocostuslactone 8 alpha-O-(6'-acetyl-beta-glucopyranoside) (1), never reported in the literature, was isolated together with other known compounds (2-14). Their structures were elucidated by the extensive use of 1 D- and 2 D-NMR experiments along with ESI-MS analyses and with comparison with literature data
Assessment of Antioxidant effect of the essential oil and methanol extract of Centaurea dimorpha Viv. aerial parts from Algeria
Full text linkThe essential oils obtained by hydrodistillation of aerial parts of Centaurea dimorpha Viv. were analyzed by means of gas chromatography-mass spectrometry (GC-MS). The main constituents were Caryophyllene oxide (09.88%), limonene (5.73%), tetradecanoic acid (5.68%), spathulenol (5.44%), methyl hexadecanoate (4.45%), and α-pinene (03.08%). To our best knowledge this is the first study of essential oils from the aerial parts of Centaurea dimorpha growing in Algeria. Moreover the essential oil and methanolic extract were screened for their possible in vitro antioxidant activity by DPPH free radical-scavenging test. The findings showed that the percentage inhibition is 10.67 and 77.01 respectively at a concentration of 1mole/L
Discovery of Ibicella lutea(Lindl.) Van Eselt. (Martyniaceae) in Kabylia (Béjaia, Algeria)
Full text linkL’auteur signale la découverte à Akbou (Béjaia, NE-Algérie) d’ibicelle jaune originaire des zones semi‐désertiques d’Amérique du Su
Rhanteriol, a New Rhanterium suaveolens Desf. Lignan with Pharmacological Potential as an Inhibitor of Enzymes Involved in Neurodegeneration and Type 2 Diabetes
No full textSeveral specialized plant metabolites are reported to be enzyme inhibitors. In this investigation, the phytochemical composition and the biological activity of Rhanterium suaveolens Desf. were studied. One new lignan (rhanteriol 1) and seven known secondary metabolites were isolated from the aerial parts of R. suaveolens by using different chromatographic procedures. The biological properties of the R. suaveolens extracts and the new compound were evaluated by measuring their ability to inhibit the cholinesterase and carbohydrate-hydrolyzing enzymes, using cell-free in vitro methods. The new lignan, rhanteriol, was shown to inhibit α-amylase and α-glucosidase (IC50 = 46.42 ± 3.25 μM and 26.76 ± 3.29 μM, respectively), as well as butyrylcholinesterase (IC50 = 10.41 ± 0.03 μM), with an effect comparable to that of the respective standards, acarbose and galantamine. Furthermore, docking studies were performed suggesting the interaction mode of rhanteriol with the active sites of the investigated enzymes. The obtained data demonstrated that the aerial part of R. suaveolens could represent a source of active molecules, such as rhanteriol, usable in the development of treatments for preventing or treating type 2 diabetes mellitus and neurodegeneration
Low concentrations of Ambrosia maritima L. phenolic extract protect endothelial cells from oxidative cell death induced by H2O2 and sera from Crohn's disease patients
No full textA rising resort to herbal therapies in Crohn's disease (CD) alternative treatments has been recently observed due to their remarkable natural efficiency. In this context, the weed plant Ambrosia maritima L., traditionally known as Hachich el Aouinet in Algeria and as Damsissa in Egypt and Sudan, is widely used in North African folk medicine to treat infections, inflammatory diseases, gastrointestinal and urinary tract disturbances, rheumatic pain, respiratory problems, diabetes, hypertension and cancer
Flora of the Dreat Mountains (Center of Algeria) - Inventory, Taxonomy and Biogeography
Get PDFFollowing the publication of the article on the synthaxonomic study of the Dreat forest, the aim of this inventory of the Dreat forest’s flora (semi-arid zone in central Algeria) to allow us a quantitative analysis on the basis of biogeographic parameters such as specific richness, geography of distribution, endemism and rarity. A subjective sampling was carried out between 2018 and 2021 at the level of the various formations (forest, matorral, altitude grasslands, and steppe). This analysis showed considerable species richness, estimated at around 468 taxa belonging to 278 genera and 66 families. Therophytes dominate the other living forms, according to the defined biological spectrum. From a biogeographical point of view, Mediterranean species constitute more than 50 percent of the study area\u27s species, followed by endemic species and rare
Redécouverte de Squilla anthericoides (Asparagaceae) en Kabylie
No full textInternational audienceDuring routine inventories of the flora of Kabylia, we were able to make theregional rediscovery in Aït Ziki (wilaya of Tizi-Ouzou) of Squilla anthericoides(syn. Charybdis anthericoides, Drimia anthericoides, Scilla anthericoides, Urgineaanthericoides, Urginea maritima var. anthericoides), an endemic to northeasternAlgeria that had not been seen in Kabylia since the end of the 19th century. Thispoorly known species was rehabilitated in 2016 only, which is why we providehere a complementary historical and ecological assessment for this autumn-flowering geophyte listed on the IUCN Red ListRedécouverte de Squilla anthericoides (Asparagaceae) en Kabylie À l'occasion d'inventaires routiniers de la flore de Kabylie, nous avons pu faire la redécouverte régionale à Aït Ziki (wilaya de Tizi-Ouzou) de Squilla anthericoides (syn. Charybdis anthericoides, Drimia anthericoides, Scilla anthericoides, Urginea anthericoides, Urginea maritima var. anthericoides), une endémique du nord-est de l'Algérie qui n'avait plus été revue en Kabylie depuis la fin du 19 e siècle. Cette espèce méconnue a été réhabilitée en 2016 seulement, c'est pourquoi nous fournissons ici un complément d'évaluation historique et écologique pour cette géophyte à floraison automnale inscrite à la liste rouge de l'UICN
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