December 2012
An overview of applications of pre-column derivatization reactions for the liquid chromatographic analysis of pharmaceuticals and other compounds
The applications of various pre-column derivatization reactions are presented in this review. The reactions are particularly applicable for various detection techniques [ultraviolet (UV), fluorescence, chemiluminscence, enantiomeric determination and mass spectrometry (MS)] in liquid chromatographic analysis of drugs and related compounds in various matrices. This review discovered that an improvement in reaction...
December 2012
Kinetics and thermodynamic studies of adsorption of malachite green onto unmodified and EDTA-modified groundnut husk
A batch experiment was applied to study the adsorption of malachite green from aqueous solution by unmodified and ethylene diamine tetraacetic acid (EDTA)-modified groundnut husk. The effect of initial dye concentration, temperature, contact time and pH on the sorption process was investigated. The Langmuir and Freundlich adsorption isotherms were applied to test the experimental data. The chemically modified groundnut...
December 2012
Decolorization and mineralization of brilliant golden yellow (BGY) by Fenton and photo-Fenton processes
The decolorization and mineralization of an azo dye, brilliant golden yellow (BGY, ï¬max416 nm, ï¥ = 7.81 x 103 Lmol-1 cm-1) by Fenton and photo-Fenton processes were investigated. The rate of decolorization is strongly dependent on the pH, initial concentrations of the dye, Fe(II) and H2O2. The effect of these parameters has been studied and the optimum operational conditions of these two...
December 2012
Preliminary screening of aflatoxin level in maize (Zea mays L.) in some selected markets in Benue State, Nigeria
Preliminary screening of aflatoxin B1 levels in maize (Zea mays L.) sold in some markets of Benue State, Nigeria, was carried out using thin layer chromatography (TLC). Concentrated chloroform extracts of 10, 15 and 40 μl were used in diethylether - methanol - water solvent system in the ratio of 96:3:1. Moisture contents of the stored and oven-dried fresh maize collected from the markets were in the range...
December 2012
New compounds based on anthracene as a good candidate for organic dye-sensitized solar cells: Theoretical investigations
The specific properties of organic-conjugated molecules and polymers are of great importance since they have become the most promising materials for the optoelectronic device technology such as solar cells. The use of low band gap materials is a viable method for better harvesting of the solar spectrum and increasing its efficiency. The control of the parameter of these materials is a research issue of ongoing interest....
December 2012
Determination and preconcentration of Mercury(II) from natural water and milk sample by Modified nano polyacrylonitrile fiber
A simple method was developed for the preconcentration of Mercury(II) based on the adsorption of its Modified nano polyacrylonitrile fiber (PANF) complex. PANF was prepared by addition of acrylic fibers to ethanolamine (EA) with different concentration solutions. The stability of a chemically Modified nano polyacrylonitrile fiber were determined especially in concentrated hydrochloric acid which was then used as a...
December 2012
Synthetic modification of gedunin and comparative antibacterial activity of gedunin and 7-deacetoxy-7α-hydroxygedunin potassium salt
Gedunin, a highly oxidized triterpenoid was obtained from hexane extractive of stem wood of Entandrophragma angolense (Welw) C. D. C. of the family Meliaceae. The gedunin was dissolved in minimum methanol at 40°C and set aside in the dark for recrystallization. Pure gedunin crystals were obtained in 0.92% yield. Methanolic alkaline hydrolysis of the gedunin...
December 2012
Kinetics of the adsorption of hexavalent Chromium from aqueous solutions on low cost material
This study proposes a Jordanian Pottery (Pot-Jo) as a low cost adsorbent for the removal of chromium from aqueous solutions. The effect of contact time, initial concentration of Cr(VI), temperature and ionic strength on the adsorption of Cr(VI) onto Pot-Jo were studied and discussed. The equilibrium (qe) of adsorption of Cr(VI) onto pottery were found to be 20.287, 17.55, and 13.577 mg Cr(VI) per gram of pottery at...
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