Volume-7 ~ Issue-7 ~ July-2014

Abstract: Graft copolymers of plantago psyllium mucilage (PSY) and acrylic acid (AA) were synthesized in aqueous solution. Ceric ammonium ion was used to initiate the graft copolymerization. Ten grades of graft copolymers were synthesized five by varying the initial concentration of the monomer and the other five by varying the initial concentration of the initiator. Evidence of graft copolymerization of the hydrolyzed products was obtained from the IR analyses. Some grafting parameters such as % grafting ratio and % conversion were favored by initial increase in the monomer concentration

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Abstract: The present work deals with separation of Th (IV) and U (VI) from Th ‒U concentrate obtained from alkaline leaching of Egyptian monazite pilot plant. The liquid–liquid extraction of Th (IV) and U (VI) from sulfate medium using tertiary amine is investigated with regard to extractant concentration, diluents type, equilibration time, pH, temperature, and extraction isotherm. Aliphatic diluents were preferred compared to aromatic diluents for their higher extraction, shorter equilibration time and good phase separation. Increasing temperature had a negative effect on Th (IV) and U (VI) extraction. Quantitative Th (IV) and U (VI) extraction efficiency was achieved at room temperature within 10 min, using three stages of extraction with 0.06 M trioctyl amine, pH 0.8 at a phase ratio of 1:1 and ΔH value for U (VI) was (-26.04 kJ/mol) and for Th(IV) was (-27.76 ), this value of ΔH for U(VI) and Th(IV) was used to obtain the corresponding free energy (ΔGU = -3994.09 kJ/mol and entropy ΔSU = 13.31 J/mol.K) and (ΔGTh = -4222.33 kJ/mol, and ΔSTh = 14.07 J/mol.K) at 298oK.
Keywords: monazite, trioctyl amine, Th ‒U cake, extraction isotherm, diluents.

[1]. Y.A. El-Nadi, J.A. Daoud, and H.F. Aly, Modified leaching and extraction of uranium from hydrous oxide cake of Egyptian monazite. Int. J. Miner. Process. 76, 2005, 101– 110.
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[3]. C.A. Morais, and L.A. Gomiero, Uranium stripping from tertiary amine loaded solution by ammonium sulfate" Minerals Engineering, 18, 2005 1277–1281.
[4]. A.K. Farag, Recovery of thorium, uranium and cerium from Egyptian monazite; M.Sc., Faculty of Science - Cairo University, 1972.
[5]. O.A. Desouky, Solvent extraction mechanism study on uranium(VI) and thorium(IV) from sulphuric acid solution and its technological application. M. Sc. Thesis, Faculty of science, Zagazig University, 1998.
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Abstract: In this study, synthesis of novel β-Lactam derivative comprising of β-Lactam moiety and NEPA-NCA [(R)-ethyl 2-(((S)-4-methyl-2,5-dioxo oxazolidin-3-yl)methyl)-4-phenylbutanoate] is disclosed. The antibacterial activity of compound-X, was screened by assaying against Staphylococcus aureus, Escherichia coli and Bacillus subtilis. Compound-X showed significant activity in vitro against the three tested bacteria at concentrations of 1 mg/1 ml, 1 mg/5ml and 1 mg/10ml.
Key words: β-Lactam, NEPA-NCA, 7-ACCA

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Abstract: Embelia schimperi is a plant belonging to the family of Myrsinaceae. The Myrsinaceae are chemotaxonomically associated with long alkyl side chain benzoquinones with embelin compound (1) being one of the benzoquinones. Isolation, constitution and synthesis of embelin (1) have already been effected but its capacity to form metallic complexes with all metals has not been studied so far. The chromatographic separation of an ethyl acetate extract from Embelia schimperi led to the isolation of a compound identified as 2,5-dihydroxy-3-methyl-1,4-benzoquinone (1) through spectroscopic analyses. Embelin (1) was modified by complexing it with nickel metal and found to form a complex under suitable conditions. The synthesis and structure determination of the metallic complex of embelin (1) have been described. The conductance measurement showed that the metallic complex formed was a non-electrolyte. The nickel metal is a good lewis acid since it has a great affinity for oxygen donors. Embelin (1) on the other hand, has electron donating carbonyl and hydroxyl oxygen atoms hence it reacts with the metal in an acid - base reaction. The Atomic Absorption Spectroscopy, Infrared Spectroscopy and 1H NMR Spectroscopy were used to determine the structure of the nickel - embelin complex.
Key Words: Embelia schimperi, Embelin, Nickel-embelin complex

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[4]. Kiremire, E., Massipa, S., Daniel, L. and Chibale, K. (2009). The synthesis, characterization and biological studies against malaria parasites of sulphur-based metal complexes of Cu (II), Cd (II), Co (II), Mn (II), Al (III) and Ag (I). (Unpublished work).
[5]. Cherutoi, J.K., Cheruiyot,L.L. and Kiprono, C.P. (2005). Synthesis and characterization of zinc (II) and copper (II) complexes of embelin. Bull.Chem.Soc.Ethiop. 19 (2), 295-299.