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Restek GCxGC Columns for Comprehensive Two-Dimensional Gas Chromatography

  • Wide range of stationary phases offers orthogonal separations.
  • High thermal stability maximizes system ruggedness and sensitivity.
  • 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 method development.

Comprehensive two-dimensional gas chromatography, or GCxGC, is a powerful multidimensional GC technique that combines two independent separations to accurately analyze highly complex samples. GCxGC involves two columns with differing stationary phase selectivity (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 secondary 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 column 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 (column 1 time x column 2 time).

Restek has been performing comprehensive two-dimensional gas chromatography since its commercial inception. 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 GCxGC secondary columns can be matched with any Restek Rtx or Rxi primary column to create the perfect orthogonal separation for your application. Visit our GCxGC column combination guide to get started. For further assistance with column selection, method development, or anything else related to comprehensive two-dimensional gas chromatography, contact us or your Restek representative today!

Products

GCxGC Selectivity Kit, 0.15 mm

  • 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, or 0.25 mm ID formats accommodate varying sample capacities, speeds, and detectors.
  • Secondary columns come in convenient 2 m lengths for economical methods development.

GCxGC Selectivity Kit, 0.18 mm

  • 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, or 0.25 mm ID formats accommodate varying sample capacities, speeds, and detectors.
  • Secondary columns come in convenient 2 m lengths for economical methods development.

GCxGC Selectivity Kit (0.25 mm)

  • 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, or 0.25 mm ID formats accommodate varying sample capacities, speeds, and detectors.
  • Secondary columns come in convenient 2 m lengths for economical methods development.

Rxi-1ms Columns (fused silica)

nonpolar phase; Crossbond dimethyl polysiloxane

  • General-purpose columns for arson accelerants, essential oils, hydrocarbons, pesticides, PCB congeners (e.g., Aroclor mixes), sulfur compounds, amines, solvent impurities, simulated distillation, oxygenates, gasoline range organics (GRO), refinery gases.
  • Tested and guaranteed for ultra-low bleed; improved signal-to-noise ratio for better sensitivity and mass spectral integrity.
  • Temperature range: -60 °C to 330/350 °C.
  • Equivalent to USP G1, G2, and G38 phases.

Rxi-5Sil MS Columns (fused silica)

low-polarity phase; Crossbond 1,4-bis(dimethylsiloxy)phenylene dimethyl polysiloxane

  • Engineered to be a low-bleed GC-MS column.
  • Excellent inertness for active compounds.
  • General-purpose columnsideal for GC-MS analysis of semivolatiles, polycyclic aromatic compounds, chlorinated hydrocarbons, phthalates, phenols, amines, organochlorine pesticides, organophosphorus pesticides, drugs, solvent impurities, and hydrocarbons.
  • Temperature range: -60 °C to 350 °C.

Rxi-XLB Columns (fused silica)

low-polarity proprietary phase

  • General-purpose columns exhibiting extremely low bleed. Ideal for many GC-MS applications, including pesticides, PCB congeners (e.g., Aroclor mixes), PAHs.
  • Unique selectivity.
  • Temperature range: 30 °C to 360 °C.

Rxi-17Sil MS Columns (fused silica)

midpolarity Crossbond phase

  • Excellent inertness and selectivity for active environmental compounds, such as PAHs.
  • Low bleed for use with sensitive detectors, such as MS.
  • 340/360 °C upper temperature limits.
  • Equivalent to USP phase G3.

Rtx-200 Columns (fused silica)

midpolarity phase; Crossbond trifluoropropylmethyl polysiloxane

  • General-purpose columns for solvents, Freon fluorocarbons, alcohols, ketones, silanes, glycols, and drugs of abuse. Excellent confirmation column with an Rtx-5 column for phenols, nitrosamines, organochlorine pesticides, chlorinated hydrocarbons, and chlorophenoxy herbicides.
  • Equivalent to USP G6 phase.

Stabilwax Columns (fused silica)

polar phase; Crossbond polyethylene glycol

  • Low-bleed PEG column ensures long column lifetimes.
  • Temperature range: 40 °C to 260 °C.
  • Equivalent to USP G14, G15, G16, G20, and G39 phases.

Rxi-1ms Secondary Columns for GCxGC (fused silica)

nonpolar phase; Crossbond dimethyl polysiloxane

  • Convenient 2 m length is ideal for use as a secondary column in GCxGC analyses.
  • General purpose columns.
  • Temperature range: -60 °C to 330/350 °C (bleed tested temperature/maximum operating temperature).

Rxi-5Sil MS Secondary Columns for GCxGC (fused silica)

low-polarity phase; Crossbond 1,4-bis(dimethylsiloxy)phenylene dimethyl polysiloxane

  • Convenient 2 m length is ideal for use as a secondary column in GCxGC analyses.
  • Engineered to be a low bleed GC/MS column.
  • Excellent inertness for active compounds.
  • General purpose columns.
  • Temperature range: -60 °C to 350 °C.

Rxi-XLB Secondary Columns for GCxGC (fused silica)

low polarity proprietary phase

  • Convenient 2 m length is ideal for use as a secondary column in GCxGC analyses.
  • General purpose columns exhibiting extremely low bleed.
  • Unique selectivity.
  • Temperature range: 30 °C to 360 °C.

Rxi-17Sil MS Secondary Columns for GCxGC (fused silica)

midpolarity Crossbond phase

  • Convenient 2 m length is ideal for use as a secondary column in GCxGC analyses.
  • 340/360 °C upper temperature limits.
  • Excellent inertness and selectivity for active environmental compounds, such as PAHs.
  • Low-bleed for use with sensitive detectors, such as MS.

Rtx-200 Secondary Columns for GCxGC (fused silica)

midpolarity phase; Crossbond trifluoropropylmethyl polysiloxane

  • Convenient 2 m length is ideal for use as a secondary column in GCxGC analyses.
  • General purpose column.
  • Temperature range: -20 °C to 340 °C.

Stabilwax Secondary Columns for GCxGC (fused silica)

polar phase; Crossbond polyethylene glycol

  • Convenient 2 m length is ideal for use as a secondary column in GCxGC analyses.
  • Low-bleed polyethylene glycol (PEG) phase.
  • Temperature range: 40 °C to 260 °C.

Universal Press-Tight Connectors

  • Universal fit: use with 0.10.53 mm ID Restek columns (0.330.74 mm OD).
  • Optional deactivated fused quartz helps eliminate activity for complete inertness along the GC flow path.
  • Optional Siltek deactivation is ideal for organochlorine pesticides analysis.
  • Connect a guard column to an analytical column.
  • Repair a broken column.
  • Connect a column outlet to a transfer line.

Restek Electronic Leak Detector

Don't let a small leak turn into a costly repairprotect your analytical column by using a Restek leak detector.

  • Audible tone indicates the severity of a leak.
  • Redesigned circuitry offers 12 hours of operation between charges.
  • Detects a broad range of gases; Ex rated for use with hydrogen and other explosive gases.*
Resources

Multimedia On-Demand Webinars

Finally! A True Peak Capacity Increase for GCxGC of Petroleum Samples

In their comparison of GC and GCxGC, Blumberg et al stated, “the peak capacity of currently practiced GC×GC does not generally exceed the peak capacity attainable from 1D-GC with the same analysis time…”. Seemingly, Blumberg’s main point was that the typical first dimension column in GCxGC is operated suboptimally. We lengthened this column to “naturally” increase peak widths and present here what we believe is the first “true peak capacity increase” for GCxGC.
Narrated by Jack Cochran, Director of New Business and Technology. Length: 55 minutes

Literature

General Interest

Determining Pesticides in Dietary Supplements with QuEChERS Extraction, Cartridge SPE, and GCxGC-TOFMS

The novel approach used here combines QuEChERS extraction, cartridge SPE cleanup, and GCxGC-TOFMS analysis, resulting in good recoveries for a wide range of pesticides in dietary supplements. Matrices include dandelion root, sage, and a multi-herb finished product.

Editorial

Comprehensive 2D Gas Chromatography — Making GC Separations Work Harder

Guest editor Dr. Phil Marriott tells us the three primary contributions ascribed to GCxGC are greater separation capacity, greater sensitivity, and a data presentation that permits identification of related compounds based on the molecular properties that control retention. The most significant advantage is separation power: to be able to resolve many more compounds immediately enables a much more complete ‘picture’ of the composition of a sample.

PDF Document

Restek GCxGC Columns: Your One Source for 2D Gas Chromatography

Restek is your one source for 2D gas chromatography! Also known as GCxGC, 2D gas chromatography is a powerful multidimensional GC technique that combines two independent separations to accurately analyze highly complex samples. By choosing a primary and a secondary column with differing (orthogonal) stationary phases, it is possible to identify analytes using comprehensive two-dimensional gas chromatography that simply cannot be separated through standard one-dimensional GC.

PDF Document

Restek GCxGC Columns: Your One Source for 2D Gas Chromatography

Restek GCxGC Columns: Your one source for 2D gas chromatography! GCxGC is a powerful multidimensional GC technique that combines two independent separations to accurately analyze highly complex samples. By choosing a primary and a secondary column with differing (orthogonal) stationary phases, it is possible to identify analytes using comprehensive two-dimensional gas chromatography that simply cannot be separated through standard one-dimensional GC.

Chromatograms