Results 151 to 160 of about 75,000 (193)

Comprehensive two-dimensional gas chromatography with pattern modulation

Journal of Chromatography A, 2015
Comprehensive two-dimensional gas chromatography (GC×GC) modulators normally transfer primary column effluent to the head of the secondary column as a series of sharp pulses. Such pulses are produced with time-varying temperature gradients in thermal modulation or with time-varying flow patterns in flow modulation.
Seeley, John V., Seeley, Stacy K.
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Optimization aspects of comprehensive two-dimensional gas chromatography

Journal of Chromatography A, 2012
Comprehensive 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, Matthew, Edwards, Tadeusz, Górecki   +2 more
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Quantitative aspects in comprehensive two-dimensional gas chromatography

Journal of Chromatography A, 2007
The 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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Evaluation of a retention model in comprehensive two‐dimensional gas chromatography

Journal of Separation Science, 2005
AbstractModeling the retention in comprehensive two‐dimensional gas chromatography (GC×GC) was achieved using retention indices obtained in conventional GC. Predicted results were compared with experimental data obtained in the two‐dimensional separation of a synthetic hydrocarbon mixture.
Vendeuvre, Colombe, Bertoncini, Fabrice, Thiébaut, Didier, Martin, Michel, Hennion, Marie-Claire   +4 more
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Odour fingerprint acquisition by means of comprehensive two-dimensional gas chromatography-olfactometry and comprehensive two-dimensional gas chromatography/mass spectrometry

Journal of Chromatography A, 2007
The analysis of complex matrices, such as perfumes, by means of gas chromatography-olfactometry (GC-O) can be rather imprecise due to the co-elutions, leading to a possible masking of odour-active trace-level compounds by major interferences or agglomeration of olfactive impressions resulting in unreliable olfactive characterization.
ZELLNER B.D., CASILLI A, DUGO, Paola, DUGO, Giovanni, MONDELLO, Luigi   +4 more
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Considerations on Orthogonality Duality in Comprehensive Two-Dimensional Gas Chromatography

Analytical Chemistry, 2011
The term "orthogonal" in comprehensive two-dimensional gas chromatography (GC × GC) has a double sided meaning as it stands for a separation resulting from the combination of two independent retention mechanisms (Giddings, J. C. J. High Resolut. Chromatogr. 1987, 10, 319) but also for a 2D separation where the components are evenly distributed over the
Badaoui, Omais, Marion, Courtiade, Nadège, Charon, Jérémie, Ponthus, Didier, Thiébaut   +4 more
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Image background removal in comprehensive two-dimensional gas chromatography

Journal of Chromatography A, 2003
This paper describes a new technique for removing the background level from digital images produced in comprehensive two-dimensional gas chromatography (GCxGC). Background removal is an important first step in the larger problem of quantitative analysis.
Stephen E, Reichenbach, Mingtian, Ni, Dongmin, Zhang, Edward B, Ledford   +3 more
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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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Multidimensional and Comprehensive Two-Dimensional Gas Chromatography

2014
The analysis of many complex samples requires a performance which conventional one-dimensional (1D) GC cannot provide. In multidimensional GC (MDGC) selected fractions of the GC eluate are online subjected to a second GC separation. This is a useful technique when only one, or a few, target analyte has to be determined.
Mohamed Adahchour, Udo A. Th. Brinkman
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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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