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Miladi H.,Laboratory of Analysis | Miladi H.,National School of Management | Mili D.,University of Sfax | Ben Slama R.,Laboratory of Analysis | And 3 more authors.
Microbial Pathogenesis | Year: 2016

Plant extracts, and their essential oils (EOs) are rich in a wide variety of secondary metabolites with antimicrobial properties. Our aim was to determine the bioactive compound in three mediterranean essential oils belonging to Lamiaceae family, Satureja montana L., Thymus vulgaris L. and Rosmarinus officinalis L., and to assess their antimicrobial, antibiofilm and anti-adhesive potentials against a foodborne pathogen Salmonella strain. The antibacterial activity of EOs and its biofilm inhibition potencies were investigated on 2 reference strains Salmonella typhimurium and 12 Salmonella spp. isolated from food. Biofilm inhibition were assessed using the 2, 3-bis [2-methyloxy-4-nitro-5-sulfophenyl]-2H-tetrazolium-5-carboxanilide (XTT) reduction assay. The analytical data indicated that various monoterpene hydrocarbons and phenolic monoterpenes constitute the major components of the oils, but their concentrations varied greatly among the oils examined. Our results showed that S. montana L. and T. vulgaris L. essential oils possess remarkable anti biofilm, anti-adhesive and bactericidal properties, compared to R. officinalis EO. There is an indication that Rosmary EO might inhibit biofilm formation at higher concentrations. Therefore, the witer savory and thyme EOs represent a source of natural compounds that exhibit potentials for use in food systems to prevent the growth of foodborne bacteria and extend the shelf life of the processed food. © 2016 Published by Elsevier Ltd.

Senhaji O.,Moulay Ismai University | Senhaji O.,CNRS Chemistry Laboratory | Achchoubi M.,Moulay Ismai University | Skalli M.K.,Laboratoire Of Chimie Appliquee | And 4 more authors.
Journal of Materials and Environmental Science | Year: 2012

The aim of this work is to prepare polystyrene latex functionalized with phosphonate groups using the surfactant methacrylic monomer, Sodium methyl-11-methacryloyloxyundecylphosphonate (MP11). To assess the possibility of incorporation of the MP11 in polystyrene, we determined its report Kp 2/KTe. The kinetics were performed under the same conditions as those with styrene that is to say, taking potassium persulfate (K2S2O8) as initiator and a temperature T = 70°C. The kinetics of disappearance of monomer MP11 was developed. The evolution of monomer concentration versus time allowed to access the value of Kp 2/KTe = 0,261 L. mol-1.s-1. This value is quite comparable to those of similar structures monomers. Lauryl and cetylmethacrylate have values Kp 2/KTe equal to 0,353 and 0,563 L. mol-1.s-1 respectively. The results show that our MP11 can be used for the preparation of latex of polystyrene functionalized with phosphonate groups.

Khalil F.,Laboratoire Of Chimie Appliquee | Bouaouine O.,Laboratoire Of Chimie Appliquee | Chtioui H.,Laboratoire Of Chimie Appliquee | Souabi S.,Laboratoire Of Genie Of Leau Et Of Lenvironnement | And 2 more authors.
Journal of Materials and Environmental Science | Year: 2015

Coagulation -flocculation is among the techniques commonly used for the treatment of discharges of leachate from landfills. The present work shows the results obtained during the processing of leachate collected at the landfill of the city of Fez by the process of coagulation- flocculation using four coagulants such as: lime Ca(OH)2, ferric chloride FeCl3, the ferric sulfate Fe2(SO4)3 and aluminum sulfate Al2(SO4)3. The process efficiency is measured in terms of metallic elements, turbidity, sludge production and color removal. Treatment with lime Ca(OH)2 allowed a significant discoloration and turbidity removal of 99 % while producing a sludge volume of 647ml/l. As to treatment with FeCl3, the results showed a 75% removal of turbidity and low production of settled sludge (245 ml/l). Treatment with Fe2(SO4)3 has a 79 % reduction in turbidity and produces a volume of 264 ml/l of settled sludge which is close to that produced by FeCl3 (245 ml/l). Furthermore, Al2(SO4)3 having a turbidity removal of about 97 % and a volume of decanted sludge slightly lower than the product during the treatment with lime (568ml/l). Regarding the analysis of metallic elements, the results showed that a substantial removal of the metallic elements in particularly elements As, Cd, Cr, Cu, Fe, Mn, Ni, Pb, Zn and Sb. Treatment with lime has shown a greater or lesser affinity for Cr (90%) Fe (96 %) and Mn (99 %). The ferric chloride and ferric sulfate allows the elimination of most of the metal elements with a high affinity for Cd, Cu, Ni, Cr and Zn. The aluminum sulfate is very suitable for the removal of Nickel Pb, Cr, Zn, respectively 95 %, 94 %, 84 % and 93.

Hayzoun H.,University Sidi Mohammed Ben Abdellah | Hayzoun H.,University of Toulon | Hayzoun H.,Universite Ibn Tofail | Ouammou A.,University Sidi Mohammed Ben Abdellah | And 7 more authors.
Journal of Materials and Environmental Science | Year: 2014

The middle Sebou receives untreated domestic and industrial wastewaters from the city of Fez (~1M hab) leading to serious water pollution problems. The aim of the present study was to assess the bacteriological and chemical quality of the Fez and Sebou Rivers, downstream and upstream from the Fez city. The results showed that the bacterial counts were high and exceeded the Moroccan environmental quality standards and the WHO water guidelines. Elevated levels of fecal contamination germs indicate the fecal contamination of Sebou and Fez rivers and consequently may represent a potential sanitary risk for the local populations due to numerous uses of Fez and Sebou waters.

Senhaji O.,Moulay Ismai University | Taouil R.,Moulay Ismai University | Skalli M.K.,Laboratoire Of Chimie Appliquee | Bouachrine M.,University Sidi Mohammed Ben Abdellah | And 3 more authors.
International Journal of Electrochemical Science | Year: 2011

The synthesis of two derivatives (sodium methyldodecylphosphonate) A and (sodium methyl (11-methacryloyloxyundecyl) phosphonate) B was performed using the methods described by (Yactine et al. 2005; Senhaji et al. 2004). After purification, the compounds obtained are characterised. The inhibitory effect on the corrosion of the two derivatives A and B has been study using weight loss measurements. Results obtained show that the compound B is found the best inhibitor and its inhibition efficiency (E %) reached up to 90% for 5 × 10 -4 M of B. On the other hand and in order to determine the relationship between the molecular structure of these compounds and inhibition efficiency, quantum chemical parameters such as the highest occupied molecular orbital energy (E HOMO), the lowest unoccupied molecular orbital energy (E LUMO), energy gap (ΔE), dipole moment (μ), electronegativity (χ), electron affinity (A), global hardness (η), softness (σ), ionization potential (I), the fraction of electrons transferred (ΔN), and the total energy (TE), were calculated. The theoretically obtained results were found to be consistent with the experimental data reported. © 2011 by ESG.

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