Bachar Zebib

Polytech Paris-UPMC, Lutetia Parisorum, Île-de-France, France

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Publications (5)4.22 Total impact

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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
  • 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 01/2013; · 1.17 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 06/2012; · 1.88 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 01/2010; · 1.17 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 - IND ENG CHEM RES. 01/2009; 48(15):6949-6956.