Analysis of methyl parathion in biological samples using thin layer chromatography.

Pesticides are major contaminating chemicals in agriculture environment and a hazard to exposed population. The pesticides form a strong class of environment pollutants, as they are sometimes nonbiodegradable, damaged not only the environment and agriculture but also have entered into the food chain thereby affecting health and development. Methyl parathion is a broad-spectrum organophosphorus insecticide generally used to control a variety of insects. The present study was planned to develop a new method for analysis of Methyl parathion in human blood samples using thin layer chromatography technique, which is simple and quick. Methyl Parathion was extracted from blood using solvent extraction methods and then identified on the TLC plates. For chromatographic separation, various binary and tertiary solvent systems were used and for detection on developed plates, palladium chloride reagent was used which successfully increased the sensitivity without dispensing with the simplicity of the method. Statistical analysis was performed on four solvent systems namely benzene: chloroform (80:20), hexane: carbontetrachloride (50:50), hexane: carbontetrachloride (20:80), hexane: propanol (20:80) which included the calculation of mean Rf value, value of standard deviation and coefficient of variance. It is evident from the statistical data that hexane: carbontetrachloride (50:50), hexane: carbon tetrachloride (20:80) is preferably good solvent systems for parathion identification by thin layer chromatography.

Synthesis, characterisation and antimicrobial screening of some AZO compounds.

In this study, a series of azo compounds were synthesized in excellent yields via the diazotization of different aromatic amines followed by coupling with 2-naphthol. These compounds were characterized by elemental analysis, IR, 1H NMR and 13C NMR spectral techniques. The synthesized compounds have been tested in vitro against a number of microorganisms in order to assess their antimicrobial properties using disk diffusion method. The minimum inhibitory concentrations (MIC) were also determined by the broath microdilution technique. Some of the products exhibited comparable activity with known standard drugs at same concentration.