Synthèse et caractérisation IR des complexes de Cd(II) ; Co(II) et Mn(II) avec des ligands bispyrazoloquinoxaline. Partie II [Synthesis and IR characterization of Cd(II) ; Co(II) and Mn(II) complexes of bispyrazoloquinoxaline ligands. Part 2]

Cinq nouveaux complexes de Cd(II), Co(II) et Mn(II) avec des ligands bispyrazoloquinoxaline ont été synthétisé et caractérisé par IR  et la conductance. Ces ligands agissent comme un bis neutres bidentés NN donneur d’électron

Synthèse et caractérisation IR et UV des complexes de Ni(II) et Cu(II) avec des ligands bispyrazoloquinoxaline. Partie I [Synthesis and IR, UV characterization of Cu(II) and Ni(II) complexes of bispyrazoloquinoxaline ligands. Part 1]

Six nouveaux complexes de Cu (II) et Ni (II) avec des ligands bispyrazoloquinoxaline ont été synthétisé et caractérisé par IR, UV et de la conductance. Ces ligands agissent comme un bis neutres bidentés NN donneur d’électron et forment des complexes polynucléaires

Chemical Composition, Antibacterial, Antifungal and Antidiabetic Activities of Ethanolic Extracts of Opuntia dillenii Fruits Collected from Morocco

peer reviewedOpuntia dillenii (Ker Gawl.) Haw. belongs to the Cactaceae family and is native to the arid and semi-arid regions of Mexico and the southern United States. O. dillenii are now used as medicinal plants in various countries. In this study, we investigated the chemical composition of ethanolic extracts obtained from seeds, juice, and peel of O. dillenii fruits collected from Morocco, and we evaluated their antibacterial, antifungal, and antidiabetic activities. Phytochemical screening revealed high quantities of polyphenols (193.73 ± 81.44 to 341.12 ± 78.90 gallic acid eq [g/100 g dry weight]) in the extracts. The major phenolic compounds determined by HPLC were gallic acid, vanillic acid, and syringic acid. Regarding flavonoids, quercetin 3-O-β-D-glucoside and kaempferol were the predominant molecules. Juice extracts showed weak to moderate antibacterial activity against the bacteria species Listeria monocytogenes, Escherichia coli, and Salmonella braenderup. All tested extracts displayed a significant inhibitory effect on α-glucosidase and α-amylase activities in vitro, with the peel extracts showing the greatest inhibitory effects. Together, these findings suggest that O. dillenii fruits are a promising source for the isolation of novel compounds with antibacterial or antidiabetic activities. For the most abundant phytochemicals identified in O. dillenii peel ethanolic extract, molecular docking simulations against human pancreatic α-amylase enzyme were performed. These indicated the presence of bioactive compounds in the extract with a better potential to decrease the enzyme activity than the commercial drug acarbose

In vitro screening, homology modeling and molecular docking studies of some pyrazole and imidazole derivatives

International audienceA series of synthesized compounds based on pyrazole and imidazole skeletons prepared by palladium catalysts via a one-pot reaction was screened to determine their inhibitory potency against the pathogen fungus Fusarium oxysporum f.sp. albedinis (F.o.a) and four bacteria strains namely Micrococcus luteus, Bacillus subtilis, Staphylococcus aureus and Escherichia coli. The obtained result showed that these compounds exhibit an efficiency antifungal action. Whereas, they showed a very weak antibacterial activity. The structure-activity relationship (SAR) Analysis and lipophilicity study demonstrates the presence of a strong relation between the structure of the ligands and the antifungal activity. On the other hand, a homology modeling and molecular docking study was carried out on the most active compounds against F.o.a fungus, in order to understand and determine the molecular interactions taking place between the ligand and the corresponding receptor of the studied target

Library of synthetic compounds based on pyrazole unit: Design and screening against breast and colorectal cancer

Pyrazolic compounds represent a large source of anticancer compounds, based on the choice of the scaffold structure, the nature of the substituents and the sites of coordination. Here, we discuss our recent progresses in identifying new active molecules from a synthetic library of 14 nitrogen compounds. All these compounds exert antiproliferative activity against breast and colorectal cancer cell lines with varying IC50 values (the half-maximal inhibitory concentration, which is a measure of the effectiveness of a compound in inhibiting biological or biochemical function). We found a onelog order difference in activity among the different tested compounds. The most active compound 7 showed an IC50 values equal to 8.5μg/ml in both MDA-MB 231(breast cancer) and LOVO (colorectal cancer) cell lines. © 2014 Bentham Science Publishers

Identification of novel antifungal agents: antimicrobial evaluation, SAR, ADME-Tox and molecular docking studies of a series of imidazole derivatives

International audienceThirty-four imidazole-based compounds synthesized by one-pot catalytic method were evaluated for their antifungal and antibacterial activities against several fungal and bacterial strains. None of the compounds had antibacterial activity. Interestingly, compounds 1, 2, 3, 10 and 15 displayed a strong antifungal activity against all the tested fungal species, while compounds 5, 7, 9, 11, 21 and 27 showed a moderate antifungal activity. To better understand the biological activity of the most active compounds ADME-Tox and molecular docking studies were carried out. Interestingly, compounds 1, 2, 3, 7, 10 and 15 showed excellent bioavailability. In addition, compounds 1, 2 and 3, exhibited good toxicity profiles. Docking studies of the two most active compounds 2 (IC50 of 95 +/- 7.07 mu M) and 10 (IC50 of 235 +/- 7.07 mu M) suggested that they might act by inhibiting the fungal lanosterol 14 alpha-demethylase. Therefore, these novel antifungal agents merit further characterization for the development of new antifungal therapeutics

Corrosion Resistance of Mild Steel Coated with Orgainc Material Containing Pyrazol Moiety

Pyridine (P1) and benzoic acid (P2) derivatives with pyrazole moieties were synthesized and evaluated as corrosion inhibitors for mild steel in acidic medium. The evaluation was performed by electrochemical impedance spectroscopy (EIS), potentiodynamic polarization, and weight loss measurement. The surface morphologies of the control and steel samples coated with the pyrazole derivatives P1 and P2 were examined by the scanning electron microscopy (SEM), UV-Vis, and X-ray photoelectron spectrocopy (XPS) spectroscopies. Results revealed minor changes on steel surfaces before and after immersion in a 1 M HCl solution. Both derivatives, P1 and P2, showed good inhibition efficiency that is dependent on inhibitor concentration. Both P1 and P2 act as mixed-type inhibitors. The benzoic acid derivative (P2) showed a higher efficiency than P1, which could be attributed to the carboxyl group that is located at the para position to the amino group. This induces a direct electronic resonance between the two groups, the amino and the carboxyl. As a result of this, a higher electron density on the carboxyl group and a stronger bonding to the metal surface occurred. Results also show that, the bonding of both pyrazoles on mild steel surface obey Langmuir adsorption isotherm. Quantum chemical calculations were performed to theoretically define the relationship between the molecular structures and inhibition efficiencies of P1 and P2