Results 161 to 170 of about 75,000 (193)
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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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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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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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Application of comprehensive two-dimensional gas chromatography to sterols analysis
Journal of Chromatography A, 2008The applicability of comprehensive two-dimensional gas chromatography (GCxGC) for sterol analysis was investigated by separation and identification of endogenous sterols in standards, and spiked in human urine. The modulation temperature was optimized to achieve the best separation and signal enhancement.
Blagoj S, Mitrevski +3 more
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Journal of Chromatography A, 2017
This work presents the development of a simple and efficient analytical protocol for the direct enantioselective resolution of sugars. A racemic mixture of the C3 sugar d,l-glyceraldehyde and the C5 monosaccharides d,l-arabinose, d,l-ribose, d,l-xylose, and d,l-lyxose was subjected to derivatization with trifluoroacetic anhydride, and corresponding ...
Iuliia, Myrgorodska +3 more
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This work presents the development of a simple and efficient analytical protocol for the direct enantioselective resolution of sugars. A racemic mixture of the C3 sugar d,l-glyceraldehyde and the C5 monosaccharides d,l-arabinose, d,l-ribose, d,l-xylose, and d,l-lyxose was subjected to derivatization with trifluoroacetic anhydride, and corresponding ...
Iuliia, Myrgorodska +3 more
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Simple calibration procedure for comprehensive two-dimensional gas chromatography
Journal of Chromatography A, 2008Mass transfer from the first-dimension to the second-dimension column in comprehensive two-dimensional gas chromatography (GC x GC) is normally quantitative, which means that the peak areas produced by GC x GC are equal to those obtained in one-dimensional gas chromatography (GC).
Minna, Kallio, Tuulia, Hyötyläinen
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Fast Comprehensive Two-Dimensional Gas Chromatography with Cryogenic Modulation
Analytical Chemistry, 2007The fast separation of a mixture of 29 compounds by using comprehensive two-dimensional gas chromatography is reported. Capillary column sets with shorter lengths and smaller inner diameter in both the first and second dimensions have been tested, for both fast chiral and achiral separations.
Melanie, Junge +3 more
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Comprehensive two-dimensional gas chromatography: A perspective on processes of modulation
Journal of Chromatography A, 2018The first comprehensive two-dimensional gas chromatography (GC×GC) experiment was reported about 25 years ago [J. Chromatogr. Sci. 29 (1991) 227-231]; the GC×GC process was made possible by the development of a transfer device, defined as modulator. The process of modulation enables the isolation of effluent segments from the first column, and their re-
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Thermal Independent Modulator for Comprehensive Two-Dimensional Gas Chromatography
Analytical Chemistry, 2016We introduce a modulation strategy for comprehensive two-dimensional gas chromatography (GC×GC) with complete thermal independence between the cooling and heating stages and without the need for GC oven heat for remobilization. Based on this approach, a compact thermal independent modulator (TiM) with thermoelectric cooling and micathermic heating has ...
Jim, Luong +4 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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