Results 151 to 160 of about 15,754 (191)
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Pulsed flow modulation comprehensive two-dimensional gas chromatography
Journal of Chromatography A, 2008Pulsed flow modulation (PFM) is based on higher flow rate time compression of the first GC column effluent, which prior to the injection into the second column is stored for a few seconds in a standard fused silica wide bore transfer line. We constructed the PFM device with two standard 1/16 in.
Marina, Poliak +2 more
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Optimization aspects of comprehensive two-dimensional gas chromatography
Journal of Chromatography A, 2012Comprehensive two-dimensional gas chromatography (GC×GC) was first introduced nearly two decades ago. Currently, it is one of the most powerful and effective techniques for the characterization and analysis of a variety of complex mixtures. GC×GC is based upon separations utilizing two chromatographic columns of differing selectivity, connected in ...
Ahmed, Mostafa +2 more
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Quantitative aspects in comprehensive two-dimensional gas chromatography
Journal of Chromatography A, 2007The effect of the amount of matrix compounds in comprehensive two-dimensional gas chromatographic (GC x GC) separation of polycyclic aromatic hydrocarbons (PAHs) was investigated. The second dimension column was overloaded by progressively increasing the matrix amount and the separation was evaluated by inspecting peak widths, asymmetries, resolution ...
Minna, Kallio, Tuulia, Hyötyläinen
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Comprehensive Two-Dimensional Gas Chromatography Mass Spectrometry-Based Metabolomics
2021Compared to one-dimensional gas chromatography with mass spectrometry (GC-MS), GC × GC-MS provides significantly increased peak capacity, resolution, and sensitivity for analysis of complex biological samples. In the last decade, GC × GC-MS has been increasingly applied to the discovery of metabolite biomarkers and elucidation of metabolic mechanisms ...
Md Aminul Islam, Prodhan +2 more
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Journal of High Resolution Chromatography, 2000
The writer of this review published in 1978 a three-part article on two-dimensional gas chromatography in the first three issues of this journal [1]. The review was written at a time when capillary column GC was still in its infancy. Commercial columns were (essentially) unavailable and sample introduction into capillary columns was done exclusively in
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The writer of this review published in 1978 a three-part article on two-dimensional gas chromatography in the first three issues of this journal [1]. The review was written at a time when capillary column GC was still in its infancy. Commercial columns were (essentially) unavailable and sample introduction into capillary columns was done exclusively in
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Molecular interconversion behaviour in comprehensive two-dimensional gas chromatography
Journal of Chromatography A, 2004Comprehensive two-dimensional gas chromatography (GC x GC) is shown to provide information on dynamic molecular behaviour (interconversion), with the interconversion process occurring on both columns in the coupled-column experiment. The experiment requires suitable adjustment of both experimental conditions and relative dimensions of each of the ...
Philip, Marriott +6 more
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Comprehensive two-dimensional gas chromatography: metrics, potentials, limits
Journal of Chromatography A, 2003Metrics for evaluation of separation performance of comprehensive two-dimensional gas chromatography (GCxGC) and for quantitative comparison of that performance with similar performance of its 1D (one-dimensional) counterparts are described. The performance improvement can be expressed via reduction in the saturation of a chromatogram or-in the case of
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Comprehensive two-dimensional gas chromatography of polybrominated diphenyl ethers
Journal of Chromatography A, 2005Comprehensive two-dimensional gas chromatography with micro electron-capture detection (GCxGC-muECD) was evaluated for the separation of 125 polybrominated diphenyl ethers (PBDEs). From among the six column combinations that were evaluated, DB-1x007-65HT was found to be the most suitable because of: (i) the highest number of BDE congeners separated ...
Korytar, P. +4 more
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Comprehensive two‐dimensional gas chromatography in stop‐flow mode
Journal of Separation Science, 2004AbstractThe theory and proof of concept of a new mode of operation for comprehensive two‐dimensional gas chromatography (GC×GC) is presented. In current GC×GC interface designs, the modulation period defines the separation time allowed in the second dimension.
James, Harynuk, Tadeusz, Górecki
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Flow-switching device for comprehensive two-dimensional gas chromatography
Journal of Chromatography A, 2004A simple flow-switching device has been developed as a differential flow modulator for comprehensive two-dimensional gas chromatography (GC x GC). The device is assembled from tubing, four tee unions, and a solenoid valve. The solenoid valve is located outside the oven of the gas chromatograph and is not in the sample path. The modulation technique has
Pedro A, Bueno, John V, Seeley
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