Gas Chromatography

Mar 21, 2016
The Column
Gas chromatography (GC) is an established and well-understood technique. As the cannabis industry grows, demand for analytical robustness is increasing for analytes such as pesticides, residual solvents, and terpenes. GC and GC coupled to mass spectrometry (GC–MS) are effective tools to address the demands of laboratories, growers, manufacturers, and consumers. This article provides an overview of the types of compounds that can be analyzed by GC, reviews the strengths and weaknesses of the analytical methods, and discusses areas of opportunity for chromatography.
Mar 17, 2016
The Column
This article describes the use of a headspace thermal desorption–gas chromatography–time-of-flight mass spectrometry (headspace TD–GC–TOF-MS) method to analyze complex aroma profiles from hops, and highlights how it can provide a rapid yet robust approach when comparing similar samples. The article also examines the potential of “soft” electron ionization at 12 eV for distinguishing between structurally similar monoterpenoids and sesquiterpenoids to provide better characterization of the often subtle differences in headspace profiles between different hop varieties.
Mar 01, 2016
LCGC North America
The terms carrier-gas flow and velocity are often used interchangeably when discussing column parameters. In LC, the two terms scale together, but in GC they do not. How does this nonintuitive behavior affect best practices for gas chromatographers?
Mar 01, 2016
LCGC North America
When monitoring toxic gases emitted from the soil, it is often necessary to recover compounds with a boiling point above that of napthalene. The use of thermal desorption makes that possible.
Feb 18, 2016
The Column
Jack Cochran’s new column “Practical GC” provides readers with practical advice and new experimental evidence for how to get the best results from their gas chromatography (GC) systems. The next instalment looks at GC inlet liner choice for “shoot and dilute” GC.
Jan 01, 2016
LCGC North America
Thermal desorption facilitates analysis of otherwise intractable samples.
Nov 09, 2015
The Column
Jack Cochran’s new column “Practical GC” aims to provide readers with practical advice and new experimental evidence for how to get the best results from their gas chromatography (GC) systems. The first article in a series on split injection GC focuses on the advantages of using “shoot-and-dilute” GC.
Nov 01, 2015
LCGC North America
Dead-volume effects can cause serious trouble for chromatographers. But if you understand what dead volume is and how it affects chromatographic results, you can take control of it.
Oct 05, 2015
The Column
By LCGC Editors
The Essentials: Optimizing Sample Introduction for Headspace GC
Oct 01, 2015
Special Issues
A method based on thermal desorption with gas chromatography–time-of-flight mass spectrometry (GC–TOF-MS) can elucidate how key volatiles vary with the size of the melon pieces. Such analytical information is of value in efforts to improve the quality and safety of ready-to-eat foods.
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