A method for the determination of 42 hazard residues required by 'Japan Positive List System' in bottled water was described. Hazard compounds in bottled water were extracted with a solid phase extraction step using C18 disks. Determination was carried out by gas chromatography/mass spectrometry (GC/MS) and liquid chromatography-tandem mass spectrometry (LC/MS/MS). The disk extraction has high ...

For the analysis of residues of veterinary drugs, liquid chromatography (LC) is of increasing importance: some of these molecules are polar, heat-sensitive and/or difRcult to analyse by gas chromatography}mass spectrometry (GC-MS). Moreover, LC is the method of choice for components of high molecular mass. Since the introduction of benchtop LC-MS instruments, there has been an increasing number...

The purpose of postmortem forensic toxicological analysis is to determine the role of any unknown drug/poison in causing death. The first and the most important step in the analysis scheme is the screening of biological specimens for the presence of drugs/poison. Currently, general unknown screening (GUS) or systemic toxicological analysis (STA) procedure involves gas chromatography-mass spectr...

A method for characterization of airborne particles including the nanoparticles fraction with a diameter of 29-58 nm in roadside atmosphere has been described. The method consists of thermal extraction (TE) and comprehensive two-dimensional gas chromatography (GC x GC) with novel detection capabilities, including high resolution time-of-flight mass spectrometry (HRTOF-MS), and simultaneous sele...

results based on the results obtained by the applied technique, the presence of carcinogenic compounds, n-nitrosomethyl-vinylamine (162 µg/g), n-nitrosonornicotine (6.3 µg/g), and acetaldehyde (117 µg/g) was confirmed in the sample. objectives the current study aimed to chemically analyze, separate and measure the existing substances in a type of chewing tobacco. materials and methods in the cu...

abstract: a combined gas chromatography-mass spectrometry (gc-ms) with headspace solid-phase micro extraction (spme) method has been employed for the analysis of the flavor volatiles of three different rice cultivar, including two modified iranian rice cultivars and hashemi rice cultivar during gelatinization. the proposed combination provided a powerful system for easy and rapid screening of a...

background & aim:jasmonic acid (ja) is regarded as endogenous regulators that play important roles in regulating stress responses, plant growth and development.effect of foliar application of ja on the essential oil and oil chemical components of hyssop (hyssopus officinalis l.) were investigated. experimental:  this study conducted in a crd with three replications and in experimental green...

untargeted. Targeted metabolomics focuses on a subset of metabolites involved in one or more pathways; the chemical identities of metabolites to be measured are known, authentic standards are available in these studies. The goal of untargeted metabolomics is to observe global metabolite profiling differences between sample types, experiments are designed to maximise the coverage of metabolites....

New mass spectral deconvolution algorithms have been developed for comprehensive two-dimensional gas chromatography/quadrupole mass spectrometry (GC × GC/qMS). This paper reports the first use of spectral deconvolution of full scan quadrupole GC × GC/MS data for the quantitative analysis of polycyclic aromatic hydrocarbons (PAH) and polycyclic aromatic sulfur heterocycles (PASH) in coal tar-con...

Gas chromatography mass spectrometry (GC-MS) and headspace gas chromatography mass spectrometry (HS/GC-MS) were used to study metabolites produced by Lactococcus lactis subsp. cremoris MG1363 grown at a temperature of 30 °C with and without agitation at 150 rpm, and at 37 °C without agitation. It was observed that L. lactis produced more organic acids under agitation. Primary alcohols, aldehyde...