We compared the performance of gas chromatography time-of-flight mass spectrometry (GC-MS) and comprehensive two-dimensional gas chromatography mass spectrometry (GC×GC-MS) for metabolite biomarker discovery. Metabolite extracts from 109 human serum samples were analyzed on both platforms with a pooled serum sample analyzed after every 9 biological samples for the purpose of quality control (QC...

A gas chromatograph (GC) coupled with a mass spectrometer (MS) forms a powerful tool for high quality quantitative and qualitative analysis. However, GC/MS analysis of complex mixtures such as essential oils often is a time-consuming task due to limitations in techniques and instrumentation. Faster analyses of these mixtures are possible by coupling the 5973A mass selective detector (MSD) with ...

due to the uncensored use of pesticides in the agricultural regions of lebanon, the contaminationrisks of drinking water by organic residues increase periodically in planting seasons. no previous work havebeen considered in north lebanon plain concerning pesticide pollution though it is the second agriculturalzone in lebanon with an excessive activity. in this context, the aim of this study was...

many of the persistent organic pollutants (pops) with endocrine disrupting properties are monitored regularly by risk assessors with limited resources, where analytical procedures are usually laborious, expensive, and not ecofriendly. moreover, these analyses were frequently advanced aiming one class of pollutants, consequently inefficient to correspond the demand of monitoring a quickly rising...

background & aim:zea mays leaf used traditionally in ibibio ethno medicine in southern nigeria to treat malaria and other inflammatory diseases. these anti-inflammatory and analgesic properties were evaluated against experimentally induced inflammation and pains using standard models. experimental: the effects of ethanol leaf extract of zea mays (170 -510 mg/kg) on experimentally induced inflam...

in this work the chemical composition and antimicrobial activity of pelargonium roseum leaves essential oil that grown in southwest of iran were determined. the hydrodistilled volatile components were identified by gc/ms analysis. a total of 33 components have been identified in the oil, representing 99.38% of the total oil and citronellol (44.63%), citronellyl formate (14.22%), isomenthon (6.3...

objective(s):various species of genus trigonella are important from medical and culinary points of view. the essential oil of trigonella torbatejamensis ranjbar as an endemic plant in iran has not been studied previously. the essential oil of this plant was analyzed by different methods for identification of its components. materials and methods: the essential oil composition of aerial parts of...

AIMS This study evaluates the suitability of gas chromatographic-mass spectrometric (GC-MS) analysis to follow-up the extent of benzodiazepine (mis)use in a Belgian prison population and compares it to other analytical strategies (e.g. screening followed by confirmation of the positive samples). DESIGN AND PARTICIPANTS From February to August 1998, 598 persons were jailed of which 188 (31.4% ...