Gas Chromatography (GC)

A selection of mini application note write-ups

GC column bleed has been postulated to be caused by "backbiting" of the siloxane chain and volatility of noncrosslinked oligimers...

In another of Ettre's historical examinations of the early days of gas chromatography, he discusses four major application fields in which the technique changed the way chemists perform analyses. These include hydrocarbon analysis, fatty acid analysis, flavour compounds and essential oils analysis, and environmental analysis. In addition, he also explains how GC helped in the evolution of liquid chromatography and in the development of the scientific industry.

Editor of LC–GC Europe, David Hills, reports on his findings from a GC users' survey conducted amongst a selection of LC–GC Europe readers.

In this month's "GC Connections," John Hinshaw reports on new gas chromatography instruments and accessories exhibited at the 55th Pittsburgh Conference.

This month's column examines the basic measurements of a peak's size and shape for the purposes of assessing and monitoring chromatographic separations over a period of time.

A novel device for coupling on-line in-tube SPME with capillary GC is presented by the guest authors and the method's application demonstrated for the analysis of contaminants in water.

In this month's "GC Connections," John Hinshaw examines the anatomy of chromatographic peaks with attention to features that help determine the suitability of individual chormatographs for a specific analysis task.

The latest newcomer to the collection of GC techniques, GCXGC, is examined in this instalment. Although this technique is capable of delivering more GC information in a shorter time than other methods, its technical complexity has slowed down widespread acceptance. John Hinshaw explains...

This review discusses the operating principles of and current applications for two-dimensional gas chromatography with heartcutting.

In the welcome return of this column, Bob McDowall revisits the evolving topic of 21 CFR 11 compliance, as it applies to chromatographers. He examines the FDA's activities in 2003 and outlines the current status of its regulations over, and guidance for, electronic records issues.

This month's "GC Connections" column provides advice on how to select the right gases and thus alleviate the problems associated with their use. It offers points to check with regard to gas grades, purities and impurities and how to ensure gas quality.

Phytosterols and stanols (hydrogenated phytosterols) are naturally occurring substances?

The current concern over acrylamide levels in food has unexpectedly brought amino acid analysis to the forefront . . .

In this month's installment, John Hinshaw reports about the 24th International Symposium on Capillary Chromatography and Electrophoresis held in May.

John Hinshaw examines the operating environment, setup, and operating conditions necessary to ensure high detector performance.

This month in GC Connections, John Hinshaw presents his report of new gas chromatography instruments and accessories exhibited at the 52nd Pittsburgh Conference...

By calculating optimal stationary-phase composition and physical parameters, column developers can construct columns that provide the exact separation requirements desired by analysis or current methods.

Thermal desorption sampling often provides a means for bringing otherwise intractable samples to a gas chromatography (GC) column for separation and detection.

Routine analysis of volatiles from fruit juices can be sampled and concentrated using a static headspace method and rapidly analyzed by high-speed GC.

In this month's "GC Connections," John Hinshaw examines optimization strategies for gas chromatography columns in the second installment of a multipart series. He starts with a question from a reader and then discusses broader column issues.

John Hinshaw reviews the new gas chromatography instrumentation and accessories introduced at Pittcon this year.

This month's column reviews some basic GC measurements and calculations that can be applied to questions of column quality. By understanding the analytical process, chromatographers can improve the quality of their results.

This report describes five small and very useful accessories developed 40 years ago to adapt gas chromatographs for special tasks.

This month's "GC Connections" begins a multipart series about gas chromatograph performance optimization. In this first part, John Hinshaw addresses questions of instrument capabilities and chromatographers' expectations, as well as manual–hardware optimization strategies and software-separation strategies.