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Synthesis and Characterization of Lanthanide Complexes of N6 – Macrocyclic Schiff Base
Issue:
Volume 1, Issue 4, October 2013
Pages:
49-52
Received:
24 September 2013
Published:
30 October 2013
Abstract: A new macrocyclic Schiff base complexes were prepared in the presence of lanthanide metal ion[La(III), Ce(III) and Gd(III)] by the reaction of 2,6 – diamino pyridine, benzoyl aceton and metal ion as template effect in the molar ratio of 2: 2: 1 respectively. The lanthanide metal complexes were characterized and investigated by using; 1HNMR, FTIR, UV/Visible spectroscopy, Elemental analysis (C.H.N.), Magnetic susceptibility and Molar conductivity measurements. The lanthanide metal ions coordinated to six nitrogen atoms of the ligand and three chloride ions to complete geometry of nine coordination complexes.
Abstract: A new macrocyclic Schiff base complexes were prepared in the presence of lanthanide metal ion[La(III), Ce(III) and Gd(III)] by the reaction of 2,6 – diamino pyridine, benzoyl aceton and metal ion as template effect in the molar ratio of 2: 2: 1 respectively. The lanthanide metal complexes were characterized and investigated by using; 1HNMR, FTIR,...
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Extractable Phenolic and Flavonoid Content from Selected Natural and Industry Processed Spices
Edna Dzifa Doe,
Adolf Kofi Awua,
Seyram Elom Achoribo,
Sandra Agbenyegah
Issue:
Volume 1, Issue 4, October 2013
Pages:
53-58
Received:
2 October 2013
Published:
10 November 2013
Abstract: A total number of 22 different spices (both natural spices and industry produced spices) bought from the Accra Markets, Ghana, were analyzed for phenolic and flavonoid content to see their impact in food preparation. The phenolic concentrations were high in the natural spices compared to the industry produced spices with the exception of IPS1 and IPS2. The trend observed is as follows: NS3> NS5> NS4> IPS2> IPS1> NS7> NS6, and NS5> NS3> NS7 > NS2> NS6 > NS4 > IPS1> IPS2 for 30˚C and cold extraction respectively. The trend observed for flavonoids in the cold extract was NS3> NS6> NS5> NS2> NS4> IPS2> IPS1> IPS13> LS7, while that of the 30˚C extract was NS3> NS5> NS4> IPS1> NS7> IPS2> IPS3> NS6> IPS. Generally, natural spices will potentially contribute extremely more phenolic and flavonoid than industry produced spices if about the same amounts are used in preparing food.
Abstract: A total number of 22 different spices (both natural spices and industry produced spices) bought from the Accra Markets, Ghana, were analyzed for phenolic and flavonoid content to see their impact in food preparation. The phenolic concentrations were high in the natural spices compared to the industry produced spices with the exception of IPS1 and I...
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Synthesis, Characterization and in Vitro Antimicrobial Studies of Schiff-Bases Derived from Acetylacetone and Amino Acids and their Oxovanadium(IV) Complexes
Misbah ur Rehman,
Muhammad Imran,
Muhammad Arif
Issue:
Volume 1, Issue 4, October 2013
Pages:
59-66
Received:
26 October 2013
Published:
10 November 2013
Abstract: A series of novel amino acid derived Schiff-bases and their Oxovanadium(IV) complexes were synthesized and well characterized by elemental analyses, spectral studies, conductivity and magnetic measurements. Physical and analytical data suggest that the Schiff bases act as tridentate ligands towards metal ion via azomethine-N, deprotonated-O of carboxylic group and enolic-O group of acetylacetone. All the complexes have lower molar conductance values, indicating their non-electrolytic nature. The synthesized ligands, along with their metal complexes were screened for their in-vitro antibacterial activity against two Gram-negative (Escherichia coli, Salmonella typhi) and two Gram-positive (Bacillus subtilis, Staphylococcus aureus) bacterial strains and for in vitro antifungal activity against Trichophyton longifusus, Candida albicans, Aspergillus flavus, and Candida glaberata species. The results of these studies revealed that all the compounds and their metal complexes showed significant antibacterial and antifungal potency. Brine shrimp bioassay was also carried out for in vitro cytotoxic properties against Artemia salina.
Abstract: A series of novel amino acid derived Schiff-bases and their Oxovanadium(IV) complexes were synthesized and well characterized by elemental analyses, spectral studies, conductivity and magnetic measurements. Physical and analytical data suggest that the Schiff bases act as tridentate ligands towards metal ion via azomethine-N, deprotonated-O of carb...
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Generation of Sulfuric Acid and Sodium Hydroxide from the Sodium Sulphate Salt by Electro-Electrodialysis(EED)
Noureddine. Zouhri,
Said. Ait Habzize,
Mahacine. El Amrani,
Mohamed. Taky,
Azzeddine. Elmidaoui
Issue:
Volume 1, Issue 4, October 2013
Pages:
75-78
Received:
27 October 2013
Published:
20 November 2013
Abstract: The electro-electrodialysis process (EED) is used to generate H2SO4 and NaOH from sulphate sodium salt Na2SO4. The key phenomenon limiting the current efficiency of this process is the proton leakage through the anion selective membrane was not observed. The electro-electrodialysis was carried out with a three-compartment cell with two platinum-coated titanium electrodes separated by three compartments. The couple membrane used in this work is AFN and CMX. The experiments were carried out for four current densities 8.33 mA.cm-2 11.11mA.cm-2, 13.88mA.cm-2 and 27.77 mA.cm-2. For each current density, a voltage variation of cell and concentrations of H2SO4 and NaOH in the two compartments with the current density was used. The concentration of H2SO4 and NaOH increases with current density and with time, but higher for NaOH. The current efficiency increases with the current applied to the cell. The request for the electro-electrodialysis operation power was calculated in terms of the electrical energy consumed to produce H2SO4 and NaOH for 6 hours of electro-electrodialysis and it was found floating with the current applied and concentration sodium sulphate used and the concentration of H2SO4 and NaOH products, but is comparable for both initial concentrations of sodium sulfate.
Abstract: The electro-electrodialysis process (EED) is used to generate H2SO4 and NaOH from sulphate sodium salt Na2SO4. The key phenomenon limiting the current efficiency of this process is the proton leakage through the anion selective membrane was not observed. The electro-electrodialysis was carried out with a three-compartment cell with two platinum-coa...
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