November 2010

Studies on some diazo coupled products of chromium(III) chelates of acetylacetone and benzoylacetone

A number of diazo coupled products of chromium(III) chelates of acetylacetone and benzoylacetone were prepared by using some aryl diazonium ions. The aryl diazonium ions of 4-chloro, 4-bromo, 2,5-dimethoxy, 4-nitro and 1-naphthyl were synthesized by diazotization of respective aniline groups. The prepared diazo coupled products were characterized on the basis of their analytical data, magnetic moment, 1H NMR...

Author(s): Abul Kalam Md. Lutfor Rahman, M. B. Hossain, M. A. Halim, D.A. Chowdhury and M. A. Salam

November 2010

Evaluation of Lead, Cadmium and Chromium in Tilapia fish obtained from Makoko and Carter Bridge Rivers in Lagos, Nigeria

Most of the fresh water fish consumed in Nigeria comes from the Southern part of the country. The major aim of this study was to evaluate the heavy metal concentrations of Tilapia fish (Tilapia orechromis) of Makoko and Carter Bridge Rivers, thereby conducting a health risk assessment of these fishes. Heavy metal analyses were carried out by atomic absorption spectrophotometry (AAS). Lead concentrations...

Author(s): O. E. Bolawa and G. O. Gbenle

November 2010

Synthesis of novel 2-quinolone derivatives

In this work, N-amino quinoline-2-one (2) has been synthesized by the reflux of coumarin (1) with hydrazine hydrate (99%) in ethanol for 12 h. The azomethines (3-6) were prepared from the corresponding aryl aldehydes and ketones. Tetrazine derivative (7) was prepared from the reaction of compound (2) with CS2 and hydrazine hydrate in the presence of potassium hydroxide. However, the reaction of compound (2) with thiol...

Author(s): Redha I. H. Al-Bayati and Mahdi F. Radi

November 2010

Characterization of colour from some dye-yielding plants in Uganda

Dyes from nine selected dye-yielding plants namely Albizia coriaria (bark), Vitellaria paradoxa (bark), Curcuma longa Linn (roots), Indigofera arrecta (leaves), Syzygium cordatum (bark), Morinda lucida (bark), Morinda lucida (roots), Rubia cordifolia (roots),Mangifera indica (bark) and Justicia betonica (leaves), collected from...

Author(s): P. A. G.  Wanyama, B. T. Kiremire, P. Ogwok and J. S. Murumu

November 2010

Phytochemical studies and pharmacological investigations on the flowers of Acacia arabica

Fresh flowers of Acacia arabica willd were extracted with 80% alcohol and the concentrated extract was fractionated in the usual way. The ethyl acetate fraction was found to contain isoquercetin. The structure was characterized by UV, NMR, Paper Chromatographic and Chemical studies. The yellow pigment was found to contain promising results with respect to acute and chronic anti-inflammatory studies. It also...

Author(s): A. Rajendran, M. Priyadarshini and D. Sukumar