Three chromatographic procedures were investigated regarding their potential for the quantification of aniline and 19 its methylated chlorinated derivatives in groundwater. These methods based on liquid-liquid-extraction combination with gas chromatography single quadrupole mass spectrometry (GC/MS) according to German standard DIN 38407–16:1999 extension using tandem (GC/MS-MS), both following...

BACKGROUND A comparative analysis by using static headspace (HS) and steam distillation (SD) GC-MS of the volatile and the semi-volatile secondary metabolites from leaves of cultivated Majorana syriaca. METHODS The essential oils endogenous to cultivated thyme were isolated and identified by HS-GC-MS technology and compared to those from SD-GC-MS. RESULTS The HS-GC-MS results showed that th...

Animal fats are preserved at archaeological sites in association with unglazed pottery, human and animal remains, and other deposits or hoards. High-temperature gas chromatography (HT-GC) and combined HT-GC/mass spectrometry (HT-GC/MS) has confirmed the presence of animal fats in lipid extracts of artifacts. Degradation products and pathways have been discerned through the analyses of archaeolo...

Gas chromatography-mass spectrometry (GC-MS) was used to detect 2-docosanol, a secondary alcohol characteristic of Mycobacterium xenopi, in 7 of 10 analyzed drinking water samples culture positive for that species. GC-MS was also used to detect tuberculostearic acid. Both of these chemical markers were analyzed as halogenated derivatives in the negative-ion-chemical-ionization mode. The numbers...

In recent years, there has been a rapid proliferation of smokeless products with a wide range of nicotine content and flavoring formulations that may appeal to new users and existing cigarette smokers. The CDC nicotine method, which employs gas chromatography-flame ionization detection (GC-FID), provides a robust means for measuring nicotine in smokeless tobacco. However, several compounds, ide...

This paper describes a simple, rapid, and effective quality assessment method for Fructus Schisandrae by gas chromatography-mass spectrum (GC-MS). The method was established by using specific lignan fingerprint profiles and quantitation of characteristic compounds in this herbal medicine. The GC-MS fingerprints of 15 batches of Schisandra samples from different regions of China showed similar l...

In this paper we are presenting several expert systems built for the identification of illicit amphetamines using GC-FTIR spectra, GC-MS spectra and a hybrid GC-FTIR GC-MS spectral database (concatenated spectral database). The systems were built using Artificial Neural Networks (ANN), and are dedicated to the recognition of amphetamines. The database is formed by chemical compounds with toxico...