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LCGC Europe-01-01-2009

LCGC Europe

Odds and Ends from the Inbox

January 01, 2009

LC Troubleshooting

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I regularly receive e-mails from readers with a wide variety of questions. Some of these blossom into full-blown columns, but many are answered with just a short response. As I cleaned out my inbox recently, I chose a few of these to share. There is no central theme this month, but hopefully you will pick up some useful information from these topics related to practical operation of the liquid chromatography (LC) system.

Frequently Asked Questions about Hydrogen Carrier Gas

January 01, 2009

GC Connections

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Chromatographers are choosing hydrogen carrier gas more often for its performance and, in the face of increasing helium prices, cost. In this instalment of "GC Connections", John Hinshaw addresses some of the more frequently asked questions he encounters regarding hydrogen as a carrier gas.

The Unique Selectivity of π-Interactions for Solid-Phase Extraction

January 01, 2009

Regular article

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Hypercrosslinked polystyrene-type (solid-phase extraction) SPE materials exhibit a unique ability to enter p-interactions with aromatic, heterocyclic and unsaturated compounds. This property permits selective extraction and pre-concentration of the above classes of species from non-polar media and fatty matrices. The principle has been exploited for developing analytical protocols to determine polar furan derivatives in mineral transformer oil, polyaromatic hydrocarbons (PAHs) in smoked fish and for the fractionation of polychlorinated aromatic compounds in environmental matrices.

The Nomenclature of Comprehensive Two-Dimensional Gas Chromatography: Defining the Modulation Ratio (MR)

January 01, 2009

Coupling Matters

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The interpretation of comprehensive two-dimensional gas chromatography (GCÃ-GC) based on the modulation ratio (MR) concept encompasses method implementation, ideas on quantitative measurement and how modulation phase affects GCÃ-GC.