November 2009
Some chemical constituents of the leaves of Cassia nigricans Vahl
The methanol extract of the leaves of Cassia nigricans Vahl. (family; Leguminosae) was investigated. Chromatographic techniques were used to purify the crude extract. The gas chromatography/mass spectrometric analysis of the extract revealed the presence of five compounds, identified as 4-hydroxyanthraquinone-2-carboxylic acid; heptadecanoic acid,14-methyl-,methyl ester; bis (2-ethylhexyl) phthalate;...
November 2009
The inhibition of corrosion of zinc in 2.0 M hydrochloric acid solution with acetone extract of red onion skin
The inhibition of the corrosion of zinc by acetone extract of red onion skin in hydrochloric acid solutions has been studied using weight loss method. The results of the study reveal that different concentrations of the extract inhibit zinc corrosion. Inhibition efficiency of the extract is found to vary with concentration and temperature. The active component in red onion skin is quercetin. Acetone extract of red onion...
November 2009
Design, synthesis and bioassay of novel metal complexes of 3-amino-2-methylquinazolin-4(3H)-one
New ligand 3-amino-2-methylquinazolin-4(3H)-one (L) has been synthesized in good yield by the reaction of anthranilic acid with acetic anhydride then replaced the oxygen with nitrogen of hydrazine. When the ligand react with Co(II), Ni(II) and Cu(II) a new complexes are formed. The chemical structure of all prepared compounds were characterized by FT-IR, elemental analysis, 1H-NNR and UV/visible spectra, moreover...
November 2009
Phytochemical constituents of some selected medicinal plants
Tannins, saponins, phlobatannins, flavonoids, anthraquinones, terpenoids, steroids, alkaloids, carbohydrates and glycosides distribution in four medicinal plants belonging to different families were investigated and compared. The medicinal plants investigated are Carica papaya, Ocimum gratissimum, Adenia cissampeloides and Cymbopogan citratus. All the plants were found to contain tannins,...
November 2009
Characterization and determination of chlorogenic acids (CGA) in coffee beans by UV-Vis spectroscopy
In this research characterization and method for determination of CGA in green and roasted coffee beans have been reported by UV-Vis spectroscopy. The optical transition properties and solvent effects of CGA were measured in different polar-solvents. After characterization of the electron transition of the standard solutions, a method was developed for UV-Vis spectrophotometer determination of CGA in coffee beans. The...
November 2009
Behavior of esters in blend and its possible application
By esterification of corresponding acids and alcohols, polyol ester of pentaeritritol–tetra–oleate (PETO) and diester of dioctyladipate (DOA), were synthesized. Each synthesis was confirmed through the comparison of some important physical and chemical properties of obtained adducts, with those of reported values. Following this step, three blends of PETO and DOA were prepared and their important physical...
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