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Chikh R.,National Graduate School of Chemistry, Rennes | Chikh R.,European University of Brittany | Couvert A.,National Graduate School of Chemistry, Rennes | Couvert A.,European University of Brittany | And 3 more authors.
Biotechniques for Air Pollution Control - Proceedings of the 3rd International Congress on Biotechniques for Air Pollution Control | Year: 2010

A biodegradable solvent was used in a two-phase aqueous-organic system for hydrophobic VOC (volatile organic compounds) elimination by activated sludge. Experiments, conducted with hexadecane as solvent and toluene as VOC, showed that toluene was removed simultaneously with part of the organic solvent elimination; cells were readily able to completely consume the toluene available at low and even at high concentrations within 48 h, even if they were not previously pre-adapted to these substrates. Source


Houlali I.,Sustainable Development Technology | Gouskir M.,Laboratoire Of Developpement Durable | Elbir M.,Sustainable Development Technology | Amhoud A.,Sustainable Development Technology | And 8 more authors.
Journal of Materials and Environmental Science | Year: 2014

The Moroccan Picholine olive variety shows performance against climate stress and environmental constraints. The virgin olive oil is exposed to extraction conditions, storage and commercialization that could alter its quality. Among the factors involved by these conditions there are; sunlight, temperature and adulteration. The objective of the present work was to evaluate the impact of such factors on the quality of the virgin olive oil extracted from the Moroccan Picholine variety. So, we have determined characteristic parameters of the quality of the virgin olive oil (VOO) like water content (WC), peroxide index (PI), acid index (AI) and density (D) according to sunlight, temperature and adulteration effects. 25 samples of VOO from the «Moroccan Picholine» cultivar in two areas in Morocco (Demnat Virgin Olive Oil and Tagzirt Virgin Olive Oil) have been studied using chemical analytical methods and pycnometry. VOO from the two Moroccan areas (DVOO and TVOO) presents low peroxide index when it is stored 15 days in obscurity. Concerning water content (WC), peroxide index (PI), acid index (AI) and density (D) parameters, a similar behavior has been observed between the two virgin olive oils (VOOs). The evolution of oils according to temperature was also evaluated. The samples were slowly heated until the temperatures of 25, 40, 55, and 70 °C. For, each VOO sample, each one of these four temperatures was maintained 10 mn. The same analyses were carried out on VOO adulterated by Refined Olive Oil (ROO). The sunlight promotes oxidation in DVOO and TVOO so that the PI Index increased but has no significant effect on the AI and the density. The WC at 25°C in TVOO is greater than the one in DVOO. In the case of heated oil, water content in DVOO, TVOO and ROO decreases progressively with temperature. The olive oil stored in darkness is affected by temperature since it makes the PI increasing from 14.6 to 19.9 O2 meq/kg in TVOO and from 16.9 to 19.9 O2 meq/kg in DVOO. DVOO and TVOO present a considerable decreasing of PI when they are adulterated by ROO. AI values of TVOO are higher than those of DVOO and decrease after adding ROO, especially below 10% of ROO. Heating makes AI increasing in oils and the heated oil the greatest AI is TVOO. A consistent result has been recorded in the case of the sunlight effect on the value of AI in TVOO whose acid index was 0.51% in the darkness and 0.73% at sunlight. Globally, virgin olive oil density increases according to the temperature and to the adulteration by refined olive oil. Source


Belouafa S.,Laboratoire Of Genie Des Procedes Et Environnement | Faouzi F.-E.,Laboratoire Of Genie Des Procedes Et Environnement | Sallek B.,Laboratoire des Agroressources et Genie des Procedes | Digua K.,Laboratoire Of Genie Des Procedes Et Environnement | And 3 more authors.
Phosphorus, Sulfur and Silicon and the Related Elements | Year: 2014

The present work focuses on the study of the influence of synthesis parameters on the chemical composition of carbonated oxygenated apatite calcium phosphate. The results show that the temperature, the maturation period, the pH, the (Ca/P) atomic ratio of the reactants, and the composition of hydrogen peroxide alter the chemical composition of apatites by acting on their mode of formation. Copyright © 2014 Taylor & Francis Group, LLC. Source


Attar A.,Laboratoire Of Genie Des Procedes Et Environnement | Mandli J.,Laboratoire Of Genie Des Procedes Et Environnement | Ennaji M.M.,Hassan II University | Amine A.,Laboratoire Of Genie Des Procedes Et Environnement
Electroanalysis | Year: 2016

Currently, rotaviruses (RVs) are the leading cause of severe childhood gastroenteritis worldwide. This study proposes a sensitive and simple label-free assay for determining rotaviruses using, for the first time, electrochemical impedance spectroscopy (EIS). The immunosensor is fabricated by self-assembled monolayers (SAMs) of cysteamine on gold sononanoparticles (AuSNPs) modified glassy carbon electrode. The electron transfer resistance (Ret) of the electrode interface was adopted as a parameter for the detection of rotavirus. Using the proposed immunosensor, a good linear relationship (r2=0.993) between impedance change and logarithmic value of rotaviruses in a wide range of 4.6 to 4.6×104PFUmL-1 was found, with a low limit of detection (LOD) 2.3PFUmL-1 and a total analysis time of 55min. Working parameters of the immunosensor, such as pH, antibodies concentration and immune-reaction time, have been investigated and optimized. No obvious interferences from non-target viruses such as hepatitis A virus (HAV) and enterovirus were found. In addition, the electrochemical impedance immunosensor has exhibited good sensitivity, selectivity and stability. © 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Source


Belouafa S.,Laboratoire Of Genie Des Procedes Et Environnement | Faouzi F.-E.,Laboratoire Of Genie Des Procedes Et Environnement | Sallek B.,Universite Ibn Tofail | Digua K.,Laboratoire Of Genie Des Procedes Et Environnement | And 3 more authors.
Phosphorus, Sulfur and Silicon and the Related Elements | Year: 2014

The present work focuses on the study of the influence of synthesis parameters on the chemical composition of carbonated oxygenated apatite calcium phosphate. The results show that the temperature, the maturation period, the pH, the (Ca/P) atomic ratio of the reactants, and the composition of hydrogen peroxide alter the chemical composition of apatites by acting on their mode of formation. © 2015 Taylor and Francis Group, LLC. Source

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