A method is described for the direct quantitation of phosphatidylcholine molecular species by reverse phase high-performance liquid chromatography employing flame ionization detection. The method is shown to be applicable to plan phosphatidylcholine. The molecular species are separated with a C18 column eluted in an isocratic mode. Detection by a commercially available flame ionization detector...

A gas-chromatographic analysis of vinylidene chloride (1,1-dichloroethylene) is presented. Vinylidene chloride was sampled by adsorbing on activated carbon. It was desorbed with carbon disulfide. The desorption efficiency was 97.2 +/- 1.05 (mean +/- standard error). The analytical column was packed with 10% Apiezon L on acid-washed Chromosorb-P. The analysis was conducted on a gas chromatograph...

The use of pesticides provides benefits such as growing food products necessary for life, sustainability production efficiency and prevention diseases caused by pests. However, these can turn into negative effects humans other living organisms with the in inappropriate doses application methods. In this study, it was aimed to determine resmethrin, which belongs insecticide class, gas chromatogr...

Background and objectives: The aerial parts of Artemisia marschalliana Sprengel as an indigenous species of genus Artemisia in the East Azerbaijan province of Iran, was subjected to phytochemical analysis, as well asanti-proliferative, free-radical-scavenging and anti-malarialactivities. Methods: The chemical composition of the essential oil o...

background : evaluation of exposition to volatile organic compounds (voc) and compare urinary level of urinary biological exposure index in sweepers in west of iran . methods: this study was carried out on 40 street sweepers and 40 non-exposed as control group living in hamadan city, west of iran. voc was analyzed using gas chromatography equipped with a flame ionization detector (fid). the uri...

A simple method for the determination of volatile selenium compounds employing a gas chromatograph equipped with a photoionization detector is described. The method involves the direct injection of dimethylselenide (DMS) or dimethyldiselenide (DMDS) into the gas chromatograph; no derivatization of the sample was required. The photoionization detector was capable of detecting 60 pg (0.55 pmol) o...

Biodiesel has become an attractive fuel recently, because it is renewable, non-toxic, biodegradable, environmentally friendly, etc. With the increase in the production of biodiesel, the problem of disposing crude glycerol, which is produced as main by-product from biodiesel process such as transesterification, has been raised. Therefore, we have been developing a new green technology-Hydrotherm...

Residual solvents are organic volatile impurities that can occur in the manufacture of Active Pharmaceutical Ingredients (APIs). analysis pharmaceutical products is necessary not only because they represent a potential risk for human health due to their toxicity and undesirables side effects, but also may affect physicochemical proprieties product. The main objective this work was 29 residual s...