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Modulation techniques and applications in comprehensive two-dimensional gas chromatography (GC x GC)
Matthias Pursch1, Kefu Sun, Bill Winniford
1Dow Deutschland GmbH & Co. OHG, Analytical Sciences, 77836 Rheinmünster, Germany. mpursch@dow.com
Analytical and Bioanalytical Chemistry
|August 13, 2002
Summary
This review highlights advancements in comprehensive two-dimensional gas chromatography (GC x GC) modulation techniques. Different modulators suit various applications, enhancing the analysis of complex samples like petroleum and environmental matrices.
Area of Science:
- Analytical Chemistry
- Chromatography
Background:
- Comprehensive two-dimensional gas chromatography (GC x GC) has evolved significantly since its inception.
- Modulation is a critical component in GC x GC, enabling the separation of complex mixtures.
Purpose of the Study:
- To review recent developments in GC x GC modulation devices.
- To discuss the suitability of different modulation techniques for various applications.
- To highlight the extension of GC x GC to hyphenated techniques like GC x GC-mass spectrometry (MS).
Main Methods:
- Review of literature on GC x GC modulation devices.
- Categorization of modulators including heated sweepers, cryofocused modulators, and diaphragm valve-switching strategies.
- Illustration of applications across different fields.
Main Results:
- Diverse modulation devices have been developed, each with specific advantages.
- Diaphragm-valve modulation excels for volatile organic compounds.
- Slotted heater and cryofocused modulation are optimal for non-volatile components.
- GC x GC is applicable to petroleum, environmental, and biological samples.
Conclusions:
- The choice of modulator in GC x GC depends on the specific analytical application.
- GC x GC coupled with MS offers expanded analytical capabilities.
- Future research trends in GC x GC are identified.