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GC COLUMNS | GENERAL-PURPOSE COLUMNS
GCxGC
Restek GCxGC Columns: Your One Source for 2D Gas Chromatography
Why Use GCxGC?
GCxGC is a powerful multidimensional GC technique that combines two independent separations to accu-
rately analyze highly complex samples. GCxGC involves two columns with differing stationary phase selec-
tivity (orthogonal) that are press-fitted together in series and separated by a modulator. The first (primary)
column performs an initial separation, and its effluent is continually focused and “injected” in defined cycles
by the modulator onto the second (secondary) column, where another separation occurs. By choosing a sec-
ondary column that is orthogonal (has different selectivity) to the primary column, it is possible to separate
and identify analytes that cannot be separated by the primary column. And, by keeping the secondary col-
umn very short, it is possible to maintain the separation produced by the primary column. Results generated
through a series of high-speed chromatograms are plotted as a contour plot, sometimes known as a retention
plane (Figure 1).
So, why use GCxGC? Because comprehensive two-dimensional gas chromatography allows you to perform
separations that are simply not possible using standard one-dimensional chromatography!
Why Use Restek GCxGC Columns?
• Wide range of stationary phases offers orthogonal separations.
• High thermal stability increases system ruggedness.
• Unrivaled column inertness for accurate analysis of active compounds.
• 0.15, 0.18, and 0.25 mm ID formats accommodate varying sample capacities, speeds, and detectors.
• Secondary columns come in convenient 2 m lengths for economical methods development.
Restek has been performing comprehensive two-dimensional gas chromatography since its commercial in-
ception. Our Innovations lab boasts multiple instruments dedicated to GCxGC applications, and we are
continually exploring new application areas—including environmental, food safety, petroleum, forensics,
fragrance, natural products, tobacco, metabolomics, and dietary supplements.
Restek’s GCxGC secondary columns can be matched with any Restek® Rtx® or Rxi® primary column to create
the perfect orthogonal separation for your application. See our combination guide below for help choosing
your GCxGC columns. We also offer a range of complementary GC accessories—including Sky® inlet liners,
the Restek® electronic leak detector, and Press-Tight® connectors—to boost your success with GCxGC.
Application Area
Primary Column Secondary Column
Phase Selectivity Phase Selectivity
Petrochemical Rxi®-1ms Nonpolar Rxi®-17Sil MS Midpolar, aromatic selective
Petrochemical Rxi®-5Sil MS Nonpolar Rxi®-17Sil MS Midpolar, aromatic selective
PAHs, environmental Rxi®-17Sil MS Midpolar, aromatic selective Rxi®-1ms Nonpolar
PAHs, environmental Rxi®-17Sil MS Midpolar, aromatic selective Rxi®-5Sil MS Nonpolar
PCBs, PBDEs, PAHs,
environmental Rxi®-XLB Nonpolar Rxi®-17Sil MS Midpolar, aromatic selective
Mono-ortho, coplanar PCBs Rxi®-1ms Nonpolar Rxi®-XLB Planar selective
Mono-ortho, coplanar PCBs Rxi®-5Sil MS Nonpolar Rxi®-XLB Planar selective
Pesticides, nitroaromatics,
halogenated compounds Rxi®-1ms Nonpolar Rtx®-200 Midpolar,
electronegative selectivity
Pesticides, nitroaromatics,
halogenated compounds Rxi®-5Sil MS Nonpolar Rtx®-200 Midpolar,
electronegative selectivity
Pesticides, nitroaromatics,
halogenated compounds Rxi®-XLB Nonpolar Rtx®-200 Midpolar,
electronegative selectivity
Flavors, fragrances Rxi®-1ms Nonpolar Stabilwax® Polar
Flavors, fragrances Rxi®-5Sil MS Nonpolar Stabilwax® Polar
Flavors, fragrances Stabilwax® Polar Rxi®-1ms Nonpolar
Flavors, fragrances Stabilwax® Polar Rxi®-5Sil MS Nonpolar
To order Restek
GCxGC columns
and accessories,
see .
To get additional
assistance in
choosing a column
pair, visit www.
Restek GCxGC Column Combination Guide
To achieve ideal results in a GCxGC analysis, it is imperative that your primary and secondary columns
feature orthogonal phases capable of producing differing separations. Use the chart below to find the perfect
combination of Restek® columns to maximize the effectiveness of your GCxGC system.
free
literature
GCxGC Columns:
Your One Source
for 2D Gas
Chromatography
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free copy from
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