Column: Coupling Matters - Chromatography Online
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Column: Coupling Matters
Robert Shellie from the Australian Centre for Research on Separation Science (ACROSS) at the University of Tasmania has taken over Coupling Matters from Robert Shellie.

GCxGC-FID Analysis of Perfumes

September 1, 2010

Exploring the use of GCxGC-FID as a technique for qualitative and quantitative analysis of perfumes

Selection of Columns for GCxGC Analysis

February 1, 2010

Demonstrating the suitability of a new wax stationary phase for GCxGC analysis of essential oils

Hyphenated Electronic Nose Technique for Aroma Analysis of Foods and Beverages

November 1, 2009

Mass spectrometry-based electronic nose technology (MS-nose technology) is a fast hyphenated technique for digital odour characterization of food and beverage products.

UHPLC Coupled with Fourier Transform Orbitrap for Residue Analysis

July 1, 2009

The trend in residue analysis has changed from target-oriented procedures towards accurate mass full-scan MS techniques. This article describes these developments and addresses the implications of 2002/657/EC.

Using Two-dimentional Liquid Chromatography to Separate Complex Mixtures of Peptides

May 1, 2009

Two-dimensional liquid chromatography (2D-LC) allows analysts to deal with complex samples that either cannot be adequately separated by one-dimensional liquid chromatography (1D-LC) or require excessively long analysis times. Peptide mixtures, whose characterization is relevant in many areas (e.g., proteomics, food analysis, pharmaceutical, life sciences), are a clear example of such complexity. An overview of the most used 2D-LC modes of operation is presented and several examples of their use for the separation of peptide mixtures are described.

A Mass Spectrometry Primer: Part 2

February 1, 2009

Part 2 of this three-part series focuses on comparing operation and performance of the most well known mass spectrometers.

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

January 1, 2009

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

Comprehensive 2D GC–QPMS with Differential Flow Modulation

November 1, 2008

Differential flow modulation is an inexpensive way to perform GC×GC separations which has been attracting growing attention recently. Differential flow modulation uses high carrier gas flow rates in the second dimension column so it is widely thought that this rules out direct coupling with mass spectrometry. However direct coupled GC×GC-QPMS using differential flow modulation is reported here for the first time using an unmodified mass spectrometer comprising a dual inlet turbomolecular pump and fast scanning quadrupole mass analyser. The suitability of the approach for characterization of essential oils is demonstrated.

Analysis of Allergens in Fragrances using Multiple Heart-cut Multidimensional Gas Chromatography–Mass Spectrometry

March 1, 2008

A total of fourteen cuts were defined because the retention time difference between several skin sensitizors was only slight.

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