Publications Internationales

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Now showing 1 - 8 of 8
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    Characterization of cardinal vine shoot waste as new resource of lignocellulosic biomass and valorization into value-added chemical using Plackett–Burman and Box Behnken
    (Springer, 2021) Didaoui, Amine; Amrane, Abdeltif; Aksil, Tounsia; Boubieb, Naima
    The objective of this work was to valorize a waste from cardinal vine shoot into a hydrolysate rich in reducing sugars. Plack- ett–Burman design was considered to identify the significant factors, while a Box Behnken design was considered to optimize the extraction in the following experimental conditions: 100 °C, 750 rpm, trifluoracetic acid (CF 3 O 2 H) concentration (TFA) in the range (1–10%), for 20 to 180 min and considering the following solid–liquid (S/V) ratios (1:1, 3:1, 5:1). The optimal result was 2.53% in sugars equivalent to a yield of 50.64% per gram of dry matter. Shoot vine waste was characterized by attenuated total reflection-Fourier transform infrared spectroscopy (ATR-FTIR), X-ray diffraction (XRD), simultaneous thermal analysis (STA), and X-ray fluorescence (XRF). The chemical composition was 43.38% cellulose, 23.58% hemicel- lulose, 21.22% lignin, 2.53% ash, 5.82% crude protein, 11.7% moisture, and extractives (0.81% fat, 0.56% total sugars, 2.3% extractive (hexane-ethanol)). The promising potential of shoot vine waste to produce sugar and other added-value compounds was demonstrated.
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    Correction to: characterization of cardinal vine shoot waste as new resource of lignocellulosic biomass and valorization into value-added chemical using Plackett–Burman and Box Behnken
    (Springer Nature, 2023) Didaoui, Amine; Amrane, Abdeltif; Aksil, Tounsia; Boubieb, Naima
    The objective of this work was to valorize a waste from cardinal vine shoot into a hydrolysate rich in reducing sugars. Plackett–Burman design was considered to identify the significant factors, while a Box Behnken design was considered to optimize the extraction in the following experimental conditions: 100 °C, 750 rpm, trifluoracetic acid (CF3O2H) concentration (TFA) in the range (1–10%), for 20 to 180 min and considering the following solid–liquid (S/V) ratios (1:1, 3:1, 5:1). The optimal result was 2.53% in sugars equivalent to a yield of 50.64% per gram of dry matter. Shoot vine waste was characterized by attenuated total reflection-Fourier transform infrared spectroscopy (ATR-FTIR), X-ray diffraction (XRD), simultaneous thermal analysis (STA), and X-ray fluorescence (XRF). The chemical composition was 43.38% cellulose, 23.58% hemicellulose, 21.22% lignin, 2.53% ash, 5.82% crude protein, 11.7% moisture, and extractives (0.81% fat, 0.56% total sugars, 2.3% extractive (hexane-ethanol)). The promising potential of shoot vine waste to produce sugar and other added-value compounds was demonstrated.
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    Valorising waste biomass from aromatic and medicinal plants to produce steam for the extraction of essential oils
    (Taylor & Francis, 2023) Ben Bouabdallah, Amina; Aksas, Hamouche; Kouini, Benalia; Louhab, Krim
    Biomass residues from the aromatic and medicinal oil extraction industries were used as fuel to produce steam necessary for the extraction of essential oils (EO) by hydrodistillation from a plant around the Mediterranean, Daucus carota L. The results obtained in terms of yield and extraction time were compared to those obtained by the classical method of hydrodistillation (HD) using electric heating. Several advantages with hydrodistillation in the presence of biomass as an energy source (BEHD) have been observed: faster kinetics and higher efficiency with similar yields: 1.03% and an extraction time of 30 min against 180 min for classic hydrodistillation. The antimicrobial activity and the antioxidant activity of the EO extracted by HD and BEHD were evaluated. The results showed that the oil extracted by BEHD has a better antioxidant activity and it is much more active than that isolated by HD.
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    Extractive dearomatization, denitrification and desulfurization of gas oil fractions by a mixed extractant of N,N-methylpyrrolidone, N,N-dimethylformamide and ethylene glycol via microwave radiations
    (Taylor & Francis, 2019) Mesdour, Souad; Boufades, Djamila; Moussiden, A.; Hamada, B.
    In an attempt to develop alternative process that meet the prescribed levelsand green-technology criteria in gas-oil refining, N,N-methylpyrrolidone(NMP), dimethylformamide (DMF) mixed solvents under microwave-radiations (MW) were tested for the gas-oil desulfurization (EDS), denitrifica-tion (EDN) and dearomatization (EDA). In optimal conditions the gas-oilEDS-efficiency via MW can reach as high as 99.1% within 5 min at 500W inthree stages, which is much higher than EDS without MW (88.5% within15 min) or than those of ionic liquids. The NMP/DMF/EG can be reused formulti-cycles before being regenerated by adsorption method. This study willprovide useful information for future industrial application
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    Liquid-liquid extraction and simultaneously spectrophotometric determination of Co (II) and W (VI) using crown ether (DB-18-C6) in aqueous media and in high speed steel
    (Taylor and Francis Online, 2020) Saoud, Abdesselam; Hammadou née Mesdour, Souad; Arzu, Nabieva; Boudjema, Hamada; Abdeltif, Amrane; Nabiev, Mohamed
    An analytical reagent ether crown DB-18-C-6 was extensively used forthe simultaneous and individual extraction and spectrophotometricdetermination of the tungsten and cobalt at microgram levels. Theligand reacts with two metals, and the ion-association systems wereextractable into chloroform giving a yellowish [(DB-18-C-6∙NH4)+2[WO(SCN)5]2]and[(DB-18-C-6∙NH4)+2[Co(SCN)4]2-]complexes.Theabsorption peaks of these complexes were found overlapping atλmax of 415 nm and 621.6 nm, respectively. Under optimum condi-tions, the [WO(SCN)4]2-] complexation and extraction are possible onlyin concentrated medium (2.5 M of HCl). While, the [Co(SCN)4]2-]wasextractable at a pH range of 4–10. The linear ranges were 29.45–-147.25μgmL−1for Co(II) and 1.8–183 μg/mL for W(VI) with molarabsorptivity,ε=1.7×104andε=1.6×104dm3mol−1cm−1,respec-tively. The accuracy and reproducibility of the proposed method forvarious amounts of cobalt and tungstenintheirbinarymixtureweretested, and the effects of diverse ions on their extraction were alsoinvestigated. The developed method was successfully applied for thesimultaneous determination of Co(II) and W(VI) in high-speed steel(HS2-9-1-8) containing 2% W, 9% Mo, 1% V, and 8% Co.
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    Vegetable oils extraction of polycyclic aromatic hydrocarbons from an Algerian quagmire
    (2014) Hamada, Boudjema; Berrabia, Nadjet; Pemanos, Yelda Bakoz; Gherbi, Abdellah
    Polycyclic aromatic hydrocarbons (PAHs) are carcinogenic substances which are resistant to environmental degradation due to their high hydrophobic nature. Soil contaminated with PAHs pose potential risks to human and ecological health, therefore concern over their adverse effects have resulted in extensive studies on their removal from contaminated soils. The main propose of this work was to extract this pollutants from two real quagmire samples from the region of Hassi Messaoud (Algeria), using three kinds of vegetable oils (Peanut oil, rapeseed oil, and coconut oil) which are naturals, cost effectives, and biodegradables extractors at two different temperatures (30 and 70 °C). Three PAHs that are representing of their present in contaminated quagmire were characterized using IR-FTIR and HPLC
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    Liquid–liquid extraction and quantitative determination of tungsten (VI) using macrocyclic reagent (DB-18-C-6) as a thiocyanate complex [WO (SCN)5]2
    (Taylor & Francis, 2014) Nabiev, M.; Hamada, B.; Nabieva, A. M.; Amrane, A.; Nasrallah, N.; Saoud, A.
    In recent years, the extraction using crown ethers has reached a resounding success in different scientific and technical fields. In this work, the authors report the results of the main steps of extraction and determination (proportioning) of the tungsten ion (VI) using a chloroformed solution of crown ether. The dibenzo–18–C-6(2,3,11,12-dibenzo-1,4,7,10,13,16-hexaoxacyclooctadeca- 2,11-diene according to the IUPAC systematic nomenclature). The identification and quantification of W(VI) using the absorption spectrum, the influence of the necessary reagents, the needed acidity level for complete extraction and complexation of W (VI) using a crown ether, and the influence of multivalent metal ions were examined, considering that the sensitivity, selectivity, and detection limits have been determined. This system obeys Beer’s law in the range of 0.18–18.3 lgcm 3of tungsten with a molar absorption of 1.6 104 mol 1 cm 1 at 415nm and the detection, quantification limits were, respectively, equal to 0.7–1.8 lgcm 3. The developed method was applied for the extraction of W(VI) in the high speed steel (HSS): HS2–9-1–8 containing 2% W, 9% Mo, 1% V, and 8% C