Bachar Zebib

University of Toulouse, Tolosa de Llenguadoc, Midi-Pyrénées, France

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Publications (9)20.74 Total impact

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    ABSTRACT: Satureja myrtifolia (Boiss. & Hohen.) Greuter & Burdeta medicinal plant belonging to the Lamiaceae family was collected from south of Lebanon and hydro-distilled by Clevenger method. Essential oil composition from aerial parts was analyzed by GC-MS technique. The odor of essential oil is characteristic, and clear yellow liquid oil was obtained after hydro-distillation. The yield of the essential oil was 1.25±0.02 % of dry matter (w/w). Thirty nine volatile components were identified in the Satureja myrtifolia oil, which shows a high amount of hydrocarbons class (57.82±0.1 %). Other classes were also identified such assesquiterpene hydrocarbons (12.96±0.1 %), oxygenated sesquiterpenes (10.65±0.2 %), phenolic compounds (10.32±0.1 %), acids (5.53±0.1 %), and monoterpenes hydrocarbons (2.21±0.1 %).In addition, a comparison with the unique study performed on Satureja myrtifolia was also carried out.
    Journal of essential oil-bearing plants JEOP 04/2015; 18(1). DOI:10.1080/0972060X.2014.890075 · 0.19 Impact Factor
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    ABSTRACT: The invention relates to a method for the synthesis of acylglycerol oligomers, characterised in that it comprises reacting: at least one precursor selected from the group formed by cyclic carbonic esters of α/α'-acylglycerol having general formula (IV) (Formula); at least one metal catalyst selected from the group formed by metal cation salts, organometallic compounds and metal oxides; and at least one organic primer selected from the group formed by hydroxyl organic compounds, at a reaction temperature below 220° C.
    Ref. No: WO 2014140480 A1, Year: 09/2014
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    ABSTRACT: Economic and technical problems related to the reduction of petroleum resources require the valorisation of renewable raw material. Recently, microalgae emerged as promising alternative feedstock that represents an enormous biodiversity with multiple benefits exceeding the potential of conventional agricultural feedstock. Thus, this comprehensive review article spots the light on one of the most interesting microalga Chlorella vulgaris. It assembles the history and a thorough description of its ultrastructure and composition according to growth conditions. The harvesting techniques are presented in relation to the novel algo-refinery concept, with their technological advancements and potential applications in the market.
    Renewable and Sustainable Energy Reviews 07/2014; 35:265–278. DOI:10.1016/j.rser.2014.04.007 · 5.51 Impact Factor
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    ABSTRACT: The microalgal structure has been investigated to evaluate the release of proteins in aqueous media from five microalgae after conducting different cell disruption techniques: manual grinding, ultrasonication, alkaline treatment, and high-pressure treatment. After conducting cell disruption, the protein concentration in water was determined for all the microalgae and the results are discussed within the context of their cell wall structure. It was found that the aqueous media containing most protein concentration followed the order: high-pressure cell disruption > chemical treatment > ultrasonication > manual grinding. Fragile cell-walled microalgae were mostly attacked according to the following order: Haematococcus pluvialis < Nannochloropsis oculata < Chlorella vulgaris < Porphyridium cruentum ≤ Arthrospira platensis .
    Algal Research 12/2013; 3. DOI:10.1016/j.algal.2013.12.004 · 4.10 Impact Factor
  • Bachar Zebib
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    ABSTRACT: A novel mesoporous material, named LRS-2, was obtained by isomorphic Al substitution and delamination of a naturally occurring kenyaite silicate layer. Delamination procedure consisting of kenyaite layers exfoliation with cetyltrimethylammonium [C16H33(CH3)3N+] alkyl chain in the presence of tetrapropylammonium hydroxide, followed by sonication step, and calcination at 700 °C to remove the organics. After delamination, surface area of LRS-2 material was increased by a factor of ca. 12.5 (30 vs. 377 m2 g−1) consisting mostly in highly accessible external surface. Its good activity for the test reaction of cumene cracking was compared of zeolitic catalyst, H-ZSM5, and it constitutes a promising ecofriendly candidate for the cracking of larger hydrocarbons.
    Journal of Inorganic and Organometallic Polymers and Materials 03/2013; 24(2). DOI:10.1007/s10904-013-9967-x · 1.08 Impact Factor
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    ABSTRACT: BACKGROUND: Today, few known plant species provide both an essential oil (EO) and a vegetable oil (VO). Seed and husk of two Aframomum species were investigated and compared in terms of EO, fatty acids, tocopherols, and tocotrienols. RESULTS: EO yield reaches 15.3 g kg(-1) in the seeds and 3.2 g kg(-1) in the husks, while VO yield is 180.0 g kg(-1) in the seeds and 25.0 g kg(-1) in the husks. β-Pinene, 1,8-cineol, α-selinene, terpine-4-ol, linalool, myrtenal and β-caryophyllene are the major compounds of seed and husk EO. Fatty acid analysis of two Aframomum species shows that oleic, linoleic, and palmitic acids were the major compounds of VO. Total sterol contents reached 4.3 g kg(-1) in seed VO and 8.5 g kg(-1) in husk VO. An appreciable amount of tocopherols (0.52 g kg(-1) ) was found in seed VO. CONCLUSION: The seed and husk oil of A. stipulatum and A. giganteum fruits are rich sources of many bioactive constituents such as fatty acids, sterols, tocopherols and tocotrienols. These tropical wild fruits can be considered as new Aroma Tincto Oleo Crops (ATOC) resources that contain both EOs and VOs. Copyright © 2012 Society of Chemical Industry.
    Journal of the Science of Food and Agriculture 01/2013; 93(1). DOI:10.1002/jsfa.5732 · 1.88 Impact Factor
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    ABSTRACT: In order to release proteins in the aqueous phase, high-pressure homogenization and alkaline treatments were applied to rupture the cell walls of five intensively grown microalgae. Protein characterisation was carried out by analysing the amino acid profiles of both the crude microalgae and the protein extracts, obtained after both types of treatment. The results showed that the proportion of proteins released from microalgae following both treatments was, in descending order: Porphyridium cruentum > Arthrospira platensis > Chlorella vulgaris > Nannochloropsis oculata > Haematococcus pluvialis, reflecting the increasingly protective, cell walls. Nonetheless, mechanical treatment released more proteins from all the microalgae compared to chemical treatment. The highest yield was for the fragile cell walled P. cruentum with 88% hydro-soluble proteins from total proteins, and the lowest from the rigid cell walled H. pluvialis with 41%. The proportion of essential and non-essential amino acids in the extract was assessed and compared to the crude microalgae profile. It was higher after alkaline treatment and much higher after high-pressure homogenization. These results suggest that non-essential amino acids are more concentrated actually inside the cells and that different types of proteins are being released by these two treatments.
    Algal Research 01/2013; 3. DOI:10.1016/j.algal.2013.11.017 · 4.10 Impact Factor
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    ABSTRACT: The purpose of present study was to stabilize curcumin food pigment by its complexation with divalent ions like (Zn(2+), Cu(2+), Mg(2+), Se(2+)), in "green media" and evaluate its stability in vitro compared to curcumin alone. The curcumin complexes were prepared by mechanical mixture of curcumin and sulfate salts of each metal (metal : curcumin 1/1mol) into unconventional and nontoxic glycerol/water solvent. Two stoichiometry of complex were obtained, 1 : 1 and 1 : 2 (metal/curcumin), respectively. On evaluation of in vitro stability, all complexes were found to provide a higher stability from curcumin alone.
    Bioinorganic Chemistry and Applications 06/2010; 2010:292760. DOI:10.1155/2010/292760 · 1.66 Impact Factor
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    ABSTRACT: The condensation of technical-grade oleic acid (OA) (65%, 85%, and 90% oleic acid) with glycidol (Gly) was carried out in an aqueous medium in the presence of a macroporous anion-exchange resin containing ammonium groups. The reaction was optimized by a unifactorial method and by a 2n−1 fractional factorial plan. The effects of the following main parameters were quantified from experiments based on a 2(5−1) = 24 factorial design: OA/Gly molar ratio, concentration (mmol of OA/mL of H2O), catalytic efficiency (mequiv of X/mmol of OA), and temperature. The conditions were optimized for a discontinuous process in a stirred reactor for selective synthesis of glycerol 1-monooleate (1-GMO) in a polymorphic system (solid resin/emulsion or microemulsion) consisting of OA/Gly/H2O/1-GMO. The catalytic role of the Ambersep 900−X resin was demonstrated by conducting the reaction using the resin in the different functional forms Ambersep 900−OH− and Ambersep 900−HCO3− and in the nonfunctionalized form Ambersep 900−Cl−. The highest yield of 1-GMO (97%) was obtained with the nonfunctionalized form Ambersep 900−Cl− at 70 °C.
    Industrial & Engineering Chemistry Research 08/2009; 48(15):6949-6956. DOI:10.1021/ie900101k · 2.24 Impact Factor