Results 301 to 310 of about 75,559 (340)

Flow-switching device for comprehensive two-dimensional gas chromatography

Journal of Chromatography A, 2004
A 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
openaire   +2 more sources

Comprehensive two-dimensional gas chromatography–mass spectrometry

Nature Reviews Methods Primers
Comprehensive two-dimensional gas chromatography (GC×GC)–mass spectrometry (MS) is currently the most powerful tool for analysing GC-amenable compounds. The technique is complemented by using MS as a third dimension, after two stages of chromatographic separation.
Mondello L., Cordero C., Janssen H. -G., Synovec R. E., Zoccali M., Tranchida P. Q.   +5 more
openaire   +4 more sources

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
openaire   +2 more sources

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
openaire   +1 more source

Comprehensive Two-Dimensional Gas Chromatography via Differential Flow Modulation

Analytical Chemistry, 2000
A novel comprehensive two-dimensional gas chromatograph has been developed that utilizes differential flow modulation. This technique uses a 6-port valve to collect effluent from a primary column and periodically inject the effluent into a secondary column.
, Seeley, , Kramp, , Hicks
openaire   +2 more sources

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

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
openaire   +2 more sources

Flow-modulation low-pressure comprehensive two-dimensional gas chromatography

Journal of Chromatography A, 2014
The present paper contains research data relative to an approach herein defined as flow-modulation (FM) low-pressure comprehensive two-dimensional gas chromatography, abbreviated as "GC×LP GC". The abbreviation LP is positioned before the second GC abbreviation because LP conditions were generated across a mega-bore second-dimension column (10m×0.53mm ...
TRANCHIDA, Peter Quinto, FRANCHINA, FLAVIO ANTONIO, DUGO, Paola, MONDELLO, Luigi   +3 more
openaire   +2 more sources

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
openaire   +2 more sources

Microfluidic Deans Switch for Comprehensive Two-Dimensional Gas Chromatography

Analytical Chemistry, 2007
A microfluidic Deans switch was used as a comprehensive two-dimensional gas chromatography (GCxGC) modulator. The simplicity and wide temperature range of the Deans switch make it a promising alternative to existing modulation techniques. However, the Deans switch is a low duty cycle modulator; that is, it samples only a small portion of the primary ...
Seeley, John V., Micyus, Nicole J., Bandurski, Steven V., Seeley, Stacy K., McCurry, James D.   +4 more
openaire   +3 more sources