Restek GCxGC Columns
- 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.
GCxGC is a powerful multidimensional GC technique that combines two independent separations to accurately analyze highly complex samples. GCxGC involves two columns with differing (orthogonal) stationary phases that are press-fitted together in series and separated by a modulator. The first (primary) column performs a separation, and its effluent is continually focused and “injected” by the modulator onto the second (secondary) column, where another separation occurs. By choosing a secondary column that is orthogonal to the primary column, it is possible to identify analytes that cannot be separated by the primary column. And by keeping the secondary column 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 retention plane, or contour plot (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, 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. Click here to visit our GCxGC column combination guide. For further assistance with column selection and method development, contact us or your Restek representative today!
 Rxi®-1ms Columns (fused silica)(nonpolar phase, Crossbond® 100% dimethyl polysiloxane)
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Rxi®-5Sil MS Columns (fused silica)(low polarity Crossbond® silarylene phase; similar to 5% phenyl/95% dimethyl polysiloxane)
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Rxi®-XLB Columns (fused silica)(low polarity proprietary phase)
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Rxi®-17Sil MS Columns (fused silica)(midpolarity Crossbond® silarylene phase; similar to 50% phenyl/50% dimethyl polysiloxane)
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 Rtx®-200 Columns (fused silica)(midpolarity phase; Crossbond® trifluoropropylmethyl polysiloxane)
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 Stabilwax® Columns (fused silica)(polar phase; Crossbond® Carbowax® polyethylene glycol)
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 Rxi®-1ms Secondary Columns for GCxGC (fused silica)(nonpolar phase, Crossbond® 100% dimethyl polysiloxane)
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Rxi®-5Sil MS Secondary Columns for GCxGC (fused silica)(low polarity Crossbond® silarylene phase; similar to 5% phenyl/95% dimethyl polysiloxane)
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Rxi®-XLB Secondary Columns for GCxGC (fused silica)(low polarity proprietary phase)
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Rxi®-17Sil MS Secondary Columns for GCxGC (fused silica)(midpolarity Crossbond® silarylene phase; similar to 50% phenyl/50% dimethyl polysiloxane)
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Rtx®-200 Secondary Columns for GCxGC (fused silica)(midpolarity phase; Crossbond® trifluoropropylmethyl polysiloxane)
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Stabilwax® Secondary Columns for GCxGC (fused silica)(polar phase; Crossbond® Carbowax® polyethylene glycol)
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 Universal Press-Tight® Connectors
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 Universal Angled Press-Tight® Connectors
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 Restek Electronic Leak DetectorDon't let a small leak turn into a costly repair—protect your instrument and analytical column by using a Restek Leak Detector.
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 Sky™ 4.0mm ID Single Taper/Gooseneck Inlet Liner w/ WoolFor Agilent GCs equipped with split/splitless inletsExceptionally inert, Sky™ inlet liners with state-of-the-art deactivation improve trace-level analysis.
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 Sky™ 4.0mm ID Single Taper/Gooseneck Inlet LinerFor Agilent GCs equipped with split/splitless inletsExceptionally inert, Sky™ inlet liners with state-of-the-art deactivation improve trace-level analysis.
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 Sky™ 4.0mm ID Cyclo Double Taper/Gooseneck Inlet LinerFor Agilent GCs equipped with split/splitless inletsExceptionally inert, Sky™ inlet liners with state-of-the-art deactivation improve trace-level analysis.
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 Sky™ 4.0mm ID Precision® Inlet Liner w/ WoolFor Agilent GCs equipped with split/splitless inletsExceptionally inert, Sky™ inlet liners with state-of-the-art deactivation improve trace-level analysis.
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 Sky™ 4.0mm ID Cyclo Inlet LinerFor Agilent GCs equipped with split/splitless inletsExceptionally inert, Sky™ inlet liners with state-of-the-art deactivation improve trace-level analysis.
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 Restek Launches New GCxGC Column ProgramPosted Sat, Aug 20, 2011 by Jack Cochran In an ongoing effort to be the leader in GCxGC columns, Restek now offers secondary columns in convenient 2m lengths for 0.15mm x 0.15µm, 0.18mm x 0.18µm, and 0.25mm x 0.25µm, for a good variety of orthogonal stationary phases. Sorry for the sales pitch, readers, but hopefully you GCxGCers will forgive me when you visit [...] |
High Quality Analysis of Pesticides in Marijuana using QuEChERS, Cartridge SPE Cleanup, and GCxGC-TOFMSPosted Sun, May 22, 2011 by Jack Cochran Recently we reported on what we believe is the first application of QuEChERS for marijuana, using it for potency analysis with GCxGC-TOFMS. Ultimately, the plan was to determine pesticides via the QuEChERS approach, combining it with cartridge SPE cleanup as we did for dietary supplements, since sample complexity would defeat the typical dispersive SPE cleanup [...] |
First QuEChERS Extraction of Marijuana with GCxGC-TOFMS Analysis, dudes…Posted Wed, Apr 20, 2011 by Jack Cochran My Restek colleagues Julie Kowalski, Michelle Misselwitz, and Amanda Rigdon, along with Professor Frank Dorman from The Pennsylvania State University (PSU), report here what we believe is the first QuEChERS extraction of marijuana, with subsequent analysis using GCxGC-TOFMS. We were assisted in this task by Randy Hoffman, a Police Officer Specialist/Evidence Technician at PSU, who [...] |
Separation of m- and p- Xylenes by Gas Chromatography on Dimethyl Polysiloxane – Is it Possible?Posted Thu, Jan 27, 2011 by Jack Cochran One of the first gas chromatography (GC) projects I tackled when I worked for the US Environmental Protection Agency a few decades ago was the separation of m- and p- xylenes for a microbial degradation experiment. I did it by purge-and-trap GC with whole column cryotrapping, a technique invented by Jim Pankow at the Oregon [...] |
Finally! A True Peak Capacity Increase for GCxGCPosted Mon, Nov 29, 2010 by Jack Cochran An ongoing controversy in comprehensive two-dimensional gas chromatography (GCxGC) is whether a true peak capacity increase has ever been achieved. You can read all about it in the article cited below, but in summary, Blumberg et. al state that a properly optimized one-dimensional (1D) GC system produces higher peak capacities than an improperly optimized GCxGC [...] |
GCxGC-TOFMS of Riser Pipe Oil from BP Gulf Oil SpillPosted Wed, Jul 28, 2010 by Jack Cochran I recently analyzed an oil sample collected by an ROV from the riser pipe at the BP Gulf oil spill site using GCxGC-TOFMS, a powerful multidimensional technique capable of characterizing complex samples that defy one-dimensional GC-MS. The GCxGC column setup was a 30m x 0.25mm x 0.25µm Rxi-17Sil MS in the first dimension with a [...] |
Pesticides in Dietary SupplementsPosted Sat, Nov 07, 2009 by Jack Cochran I was at the Recent Advances in Food Analysis conference in Prague last week and presented work on analyzing pesticides in dietary supplements, a very important subject given that FDA is moving to regulate these products. They are very complex herbal, botanical, etc. materials, which makes looking for trace level components very tricky. My colleagues, [...] |
Multiply Your Separation Power with GCxGC and Selective ColumnsPosted Tue, May 12, 2009 by Jack Cochran An elegant way to solve complex separation problems is comprehensive two-dimensional GC (GCxGC). GCxGC increases peak capacity with two independent separations in one analysis. GCxGC uses a serial configuration of orthogonal stationary phases separated by a thermal modulator. A separation is performed on the first column, and effluent from the first column is repeatedly/quickly focused [...] |
Finally! A True Peak Capacity Increase for GCxGC of Petroleum SamplesIn 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 |
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 Comprehensive 2D Gas Chromatography — Making GC Separations Work HarderGuest 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. |
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