Bouhadda Youcef

University Mustapha Stambouli of Mascara · Department of Biology

Les cyclodextrines sont des macromolécules en forme de tore capables d’encapsuler en leur structure plusieurs espèces chimiques dans un processus nommé inclusion de type Host-Guest. L’inclusion d’une molécule thérapeutique la tétracaine hydrochloride dans la β-CD fait l’objet de cette étude. Les résultats obtenus en utilisant des méthodes de la chi...

Quantitative liquid 1H and solid 13C CPMAS NMR spectroscopy were used in combination with qualitative DEPT (Distortionless Enhancement by Polarization Transfer) and liquid 13C NMR to investigate the molecular structural parameters of an Algerian asphaltenes. The molecular weight of the asphaltene ionisable species determined by positive Electro Spr...

In this study, the adsorption of Algerian asphaltene sample extracted from Hassi Messaoud oil field is conducted for the first time. The adsorption process was performed using novel synthesized iron oxide nanoparticles (γ-Fe2O3). γ-Fe2O3 nanoparticles were in-house synthesized and characterized by an array of techniques using, Brunauer–Emmett–Telle...

From near-infrared spectrophotometry measurements, flocculation onset for an Algerian asphaltene in different toluene/non-solvent solutions were detected. The Hansen solubility parameters of the extracted asphaltene and sub-fractions were calculated and compared to ones of a set of good and bad solvents. The ranking of the different solvents accord...

Objective: To evaluate the antibacterial and antioxidant activities and to identify the volatile bioactive compounds present in different crude extracts of the seaweed Caulerpa racemosa var. cylindracea. Methods: Caulerpa racemosa harvested from the intertidal zone of Mostaganem coast (N 35°54’37.94”, E 0°3’17.37”) was subjected to Soxhlet extracti...

С помощью спектроскопии в ближней инфракрасной области в различных растворах толуол/нерастворитель было обнаружено возникновение коагуляции алжирских асфальтенов. С помощью ранжирования растворителей согласно методу сферы растворимости Хансена были определены и сопоставлены значения различных параметров растворимости экстрагированных асфальтенов и...

Abctract The aim of this work is to explore the floculation behavior of asphaltenes (extracted from a deposit recovered from a Hassi-Messaoud oil well) in solution in toluene according to the polarity of the flocculating medium. The flocculation thresholds related to the addition of two flocculating agents of different polarities (n-heptane and ace...

Solubility and micelle formation of tetracaine-hydrochloride (TC,HCl) in aqueous solution has been studied by thermal conductivity. From thermal variations of the specific conductivity, parameters such as the critical micelle concentration, cmc, Krafft temperature, TK, and the variation of solubility with temperature were determined. The cmc's data...

The complexation of the drug Tetracaine-hydrochloride (TC, HCl) with β-cyclodextrin (β-CD) was studied by means of UV-Visible Spectrophotometry and positive electrospray ionization mass spectrometry ESI+/MS and 1D ¹H-NMR. The experimental results confirm that an inclusion complex was formed between the drug and β-CD and that the cationic end of the...

Both LDI-TOF and MALDI-TOF Mass spectroscopy experiments of an Algerian asphaltene derived from a deposit were performed. LDI mass experiments were conducted for both linear and reflectron modes under laser wavelength/attenuation variation. The different LDI-Mass spectra show that mass distribution depends on experimental condition for masses below...

This work assesses the feasibility of using wind energy for pumping water to supply the Ténès region in Algeria. The assessment starts with taking the velocity data and the direction of the wind acquired at 10 m height to establish a statistical analysis model using the Weibull distribution. This developed wind power model is then correlated to the...

Abstract The conversion of methyl chloride was one of many possibilities to reach hydrocarbon products. The solid H-ZSM5 with his specific morphology and acidic property gave the catalytic transformation. In other published papers, more details about the influence of some operating parameters on the activity of conversion were presented. To complet...

Abstract The attitude of the Saharan variety tadalaghte of Phaseolusvulgaris L. Beanin presence of growing doses of NaCl shows it can be able to stand moderate doses of this salt. The lack in water caused by the osmotic pressure in the root environment does not prevent this variety from being supplied with water, by carrying out an osmo-control and...

Although Algerian crude oil contains only minor asphaltenes amounts (≤1% in weight), it is unstable with respect to the asphaltene flocculation during its storage [1]. Asphaltenes represent the heaviest and most polar oil fraction. These compounds are responsible for deposit formations because of their strong tendency to self-aggregate causing majo...

Algerian oil well deposit derived asphaltene fraction was characterized by different MAS/NMR sequences to investigate asphaltene aromaticity and the best cross-polarization contact time. The aromaticity was estimated by single pulse sequence (SP), Hahn-echo (HE), cross-polarization (CP) and variable cross-polarization (VACP) sequences. The values f...

X-ray diffraction, liquid 1H and solid 13C nuclear magnetic resonance (NMR), Raman, Fourier transform infrared (FTIR), laser desorption/ionization-time of flight (LDI-TOF) mass and fluorescence spectroscopy have been used to determine structural properties of asphaltenes obtained from Hassi Messaoud crude oil. While liquid 1H- and 13C-NMR, IR, and...

The objective of this work was to separate and study a least stable fraction of Hassi−Messaoud asphaltenes that flocculate during oil transport and storage. The unstable fraction was studied by consecutive fractioning with solvents differing in polarity. A correlation between structural parameters of asphaltenes and the flocculation onset was estab...

Asphaltenes derived from Algerian oil wells were characterized by Raman spectrometry to investigate their molecular structures in solid-state. The aromatic sheet diameter (La) was estimated using the integrated intensities of the G and the D1 mode, along with the Tuinstra equation [Tuinstra F, Koenig JL. J Chem Phys 1970;53:1126]. The values obtain...

Viscosimetry, tensiometry, and X-ray diffraction have been employed to determine physicochemical and structural properties of an Algerian asphaltene in solution. A new viscosity analysis scheme was adopted to extract information about the shape of the asphaltene aggregates, the solvation, and the inter-aggregate interactions. The average molecular...

We note in the reaction that the main molecules included in the process and explained that the transformations (Boukratem, 1997, 2003) are CH 3 Cl, C 2 H 4 and HCl. Other studies were led (Jaumain and Su, 2002; Wei et al., 2006) on the same subject. With these three elements, we constitute a mathematical development relating the thermodynamic study...