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 ...

The volatile composition of 20-year-old out-of-service creosote-treated railway wood sleepers was studied. The emitted volatile fraction was collected by means of dynamic purge-and-trap concentration at ambient temperature, and analyzed by comprehensive two-dimensional gas chromatography (GC x GC) hyphenated with mass spectrometric detection systems, using quadrupole (GC x GC/qMS) and time-of-f...

This paper investigates methods for comparing datasets produced by comprehensive two-dimensional gas chromatography (GC x GC). Chemical comparisons are useful for process monitoring, sample classification or identification, correlative determinations, and other important tasks. GC x GC is a powerful new technology for chemical analysis, but methods for comparative visualization must address cha...

Introduction The class of dithiocarbamate fungicides (DTCs) is widely used in agriculture. They are non-systemic and both the formulation and their break-down products typically remain at the site of application. DTCs are characterized by a broad spectrum of activity against various plant pathogens, low acute mammal toxicity, and low production costs . The dithiocarbamate moiety is highly react...

Comprehensive two-dimensional gas chromatography (GC GC) presents information technology challenges in data handling, visualization, processing, analysis and reporting. With its significantly greater separation capacity, GC GC generates data sets that are two to three orders-of-magnitude larger than for conventional GC and that exhibit an order-of-magnitude or more distinct peaks in complex mul...

It is controversially discussed whether human IgM(+)IgD(+)CD27(+) B cells, which carry somatically mutated Ig variable region (IgV) genes, are derived from germinal centres (GC) B cells or originate from another developmental pathway. GC composed of IgM(+)IgD(+) B cells, which co-express the CD70 surface marker, have been described in approximately 10% of tonsils. As IgM(+)IgD(+)CD27(+) B cells...

Abstract Citrus aurantium amara (sour orange) belongs to one of the largest genera Rutaceae family. The species this genus are consumed worldwide as fresh or in form beverages. They include well-known crops lemons, oranges, mandarins, grapefruits, and limes. industrial processing these fruits produces high amounts waste (around 50%) which is a valuable source essential oils. Since they produced...

In the past two decades, comprehensive two-dimensional gas chromatography (GC×GC) has progressed from an interesting concept to forefront of thinking and research in chromatography. Especially when combined with mass spectrometry detection, GC×GC provides high resolution, sensitivity, massive chromatographic data sets, which is useful diverse fields such as petroleum analysis, metabolomics, foo...