Results 261 to 270 of about 23,921,062 (292)

Pulsed flow modulation comprehensive two-dimensional gas chromatography

Journal of Chromatography A, 2008
Pulsed 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, Maya, Kochman, Aviv, Amirav   +2 more
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Application of comprehensive two-dimensional gas chromatography to sterols analysis

Journal of Chromatography A, 2008
The 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, J Thomas, Brenna, Y, Zhang, Philip J, Marriott   +3 more
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Enantioresolution and quantification of monosaccharides by comprehensive two‐dimensional gas chromatography

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, Thomas, Javelle, Cornelia, Meinert, Uwe J, Meierhenrich   +3 more
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Simple calibration procedure for comprehensive two-dimensional gas chromatography

Journal of Chromatography A, 2008
Mass 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, 2007
The 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, Stefan, Bieri, Helmut, Huegel, Philip J, Marriott   +3 more
openaire   +2 more sources

Comprehensive two-dimensional gas chromatography of polybrominated diphenyl ethers

Journal of Chromatography A, 2005
Comprehensive 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., Covaci, A., Leonards, P.E.G., de Boer, J., Brinkman, U.A.Th.   +4 more
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Comprehensive two‐dimensional gas chromatography in stop‐flow mode

Journal of Separation Science, 2004
AbstractThe 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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Comprehensive two-dimensional gas chromatography: A perspective on processes of modulation

Journal of Chromatography A, 2018
The 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, 2016
We 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, Xiaosheng, Guan, Shifen, Xu, Ronda, Gras, Robert A, Shellie   +4 more
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Comprehensive two-dimensional gas chromatography of the 209 polychlorinated biphenyls

Journal of Chromatography A, 2003
Comprehensive two-dimensional gas chromatography (GC x GC) of the 209 polychlorinated biphenyls (CBs) was carried out using a longitudinally modulated cryogenic system (LMCS) and liquid carbon dioxide as cryogen. The effluent from a non-polar column was modulated and further separated on either a polar or a shape-selective second-dimension column. Five
Mikael, Harju, Conny, Danielsson, Peter, Haglund   +2 more
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