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Restek GCxGC Columns for Comprehensive Two-Dimensional Gas Chromatography

Restek is your one source for 2D gas chromatography! Also known as GCxGC, comprehensive two-dimensional gas chromatography is a powerful technique th...

Fingerprinting Crude Oils and Tarballs using Biomarkers and Comprehensive Two-Dimensional Gas Chromatography (PDF 2138kB)

... and Comprehensive Two-Dimensional Gas Chromatography By Michelle Misselwitz, Jack Cochran, Chris English of key biomarkers, such as steranes and hopanes. Comprehensive two-dimensional gas chromatography time...

News: Fingerprinting Crude Oils and Tarballs using Biomarkers and Comprehensive Two-Dimensional Gas Chromatography

Author(s): Michelle Misselwitz, Jack Cochran, Chris English, and Barry Burger Restek Corporation Published By: Restek Corporation Year of Publication: 2013 Link: http://www.restek.com/Technical-Resources/Technical-Library/Petroleum-Petrochemical/petro_PCAN1789-UNV Abstract: Petroleum biomarkers are “molecular fossils” that can be analyzed with gas chromatography to fingerprint crude oil. Fingerprints … Continue reading

News: Evaluation of Conditions of Comprehensive Two-Dimensional Gas Chromatography That Yield a Near-Theoretical Maximum in Peak Capacity Gain

Author(s): Matthew S. Klee1, Jack Cochran2, Mark Merrick3, Leonid M. Blumberg4 XO Associates LLC Restek Corporation LECO Advachrom Published By: Journal of Chromatography A Year of Publication: 2015 Link: http://www.sciencedirect.com/science/article/pii/S0021967315000771 Abstract: The peak capacity gain (Gn) of a GCxGC system … Continue reading

Fingerprinting Crude Oils and Tarballs using Biomarkers and Comprehensive Two-Dimensional Gas Chromatography

... of key biomarkers, such as steranes and hopanes. Comprehensive two-dimensional gas chromatography time efficient, comprehensive two-dimensional gas chromatography time-of-flight mass spectrometry instead of one-dimensional ... Comprehensive two-dimensional gas chromatography time-of-flight mass spectrometry (GCx...

News: Determination of Emerging Contaminants in Wastewater Utilizing Comprehensive Two-Dimensional Gas-Chromatography Coupled with Time-of-Flight Mass Spectrometry

Author(s): Sarah Prebihalo1, Adrienne Brockman1, Jack Cochran1,2, Frank L. Dorman1,3 1. Pennsylvania State University, Forensic Science Program 2. Restek Corporation 3. Pennsylvania State University, Department of Biochemistry and Molecular Biology Published By: Journal of Chromatography A Year of Publication: 2015 … Continue reading

News: Comprehensive Two-Dimensional Gas Chromatography Time of Flight Mass Spectrometry (GCxGC-TOFMS) for Environmental Forensic Investigations in Developing Countries

Author(s): Jayne de Vosa, Roger Dixonb, Gerhard Vermeulenb, Peter Gorst-Allmanc, Jack Cochrand, Egmont Rohwere, Jean-Francois Focantf a Organic and Bio-Analysis Group, Metrology in Chemistry Area, National Metrology Institute of South Africa, Private Bag X34, Lynnwood Ridge 0040, South Africa b … Continue reading

Restek GCxGC Columns: Your One Source for 2D Gas Chromatography (PDF 471kB)

...Restek GCxGC Columns Your One Source for 2D Gas Chromatography Primary GCxGC Columns (In order -XLB, and Stabilwax column. • Comprehensive kit simplifies column selection for method developers and frequent GCx ... GCxGC column, secondary column, primary column, comprehensive two-dimensional gas chromatography...

Restek GCxGC Columns: Your One Source for 2D Gas Chromatography (PDF 9170kB)

... 1). So, why use GCxGC? Because comprehensive two-dimensional gas chromatography allows you has been performing comprehensive two-dimensional gas chromatography since its commercial inception ... GCxGC column, secondary column, primary column, comprehensive two-dimensional gas chromatography...

Determining Pesticides in Dietary Supplements with QuEChERS Extraction, Cartridge SPE, and GCxGC-TOFMS (PDF 1695kB)

... technique,comprehensive two-dimensional gas chromatography(GCxGC) with time-of-flight MS.GCxGC offers GC-TOFMS was operated in comprehensive two-dimensional gas chromatography mode with a 30 mx 0.25 mm x 0.25 µm Rxi-5Sil...

News: Comprehensive Two-Dimensional Gas Chromatography With a Multi-Capillary Second Dimension: A New Column-Set Format for Simultaneous Optimum Linear Velocity Operation

Author(s): Daniela Peroni1, Andjoe A.S. Sampat1, Wil van Egmond2, Sjaak de Koning3, Jack Cochran4, Roy Lautamo4, Hans-Gerd Janssen1,5 1. University of Amsterdam, 2. NLISIS, 3. LECO Corporation, 4. Restek Corporation, 5. Advanced Measurement and Data Modelling, Unilever Published By: Journal … Continue reading

Evaluation of Dispersive and Cartridge Solid Phase Extraction (SPE) Cleanups for Multiresidue Pesticides in QuEChERS Extracts of Finished Tobacco Using GCxGC-TOFMS (PDF 4409kB)

.... Comprehensive two-dimensional gas chromatography time-of-flight mass spectrometry (GCxGC-TOFMS) was used supplement finished products we employed comprehensive two-dimensional gas chromatography time...

Rxi GC Columns Sales Sheet (PDF 3173kB)

... as a retention plane. So, why use GCxGC? Because comprehensive two-dimensional gas chromatography allows you has been performing comprehensive two-dimensional gas chromatography since its commercial inception...

News: Eight Tips for Easy GC×GC

Author(s): Jack Cochran Restek Corporation Published By: The Analytical Scientist Issue: #18 (0714) Year of Publication: 2014 Link: https://theanalyticalscientist.com/issues/0714/eight-tips-for-easy-gcxgc/ Abstract: Comprehensive two-dimensional gas chromatography is often presented as extremely complicated. It isn’t. Here is some simple advice to help attract more … Continue reading

ChromaBLOGraphy: Julie Kowalski on the Front Lines at the European Pesticide Residue Workshop

The photo shows Restek’s own Julie Kowalski, Food Innovations Chemist, discussing her European Pesticide Residue Workshop Poster, “Evaluation of the QuEChERS Sample Preparation Method and Comprehensive Two-Dimensional Gas Chromatography for the Analysis of Pesticides in Dietary Supplements”, with an interested workshop attendee.  Both QuEChERS and GCxGC (comprehensive two-dimensional GC) are popular techniques at the conference, [...]

ChromaBLOGraphy: Dilution and cleanup strategies for QuEChERS extracts of food prior to LC-MS/MS… and Tarballs!

If you missed the newly published tour de force piece from Julie Kowalski, check it out here: ”Mitigating Matrix Effects: Examination of Dilution, QuEChERS, and Calibration Strategies for LC-MS/MS Analysis of Pesticide Residues in Diverse Food Types.” Same thing for another excellent article just published by Michelle Misselwitz, “Fingerprinting Crude Oils and Tarballs using Biomarkers and Comprehensive Two-Dimensional Gas Chromatography.” [...]

ChromaBLOGraphy: Peak Capacity and Selectivity in Gas Chromatography

I recently had the pleasure of hearing Professor Taduesz Gorecki from the University of Waterloo lecture on comprehensive two-dimensional gas chromatography (GCxGC).   One of his chief areas of research is on the GCxGC modulator, which is essentially the “injector” for the second dimension column in this multidimensional chromatography approach.  A twist on the usual process from Taduesz […]

ChromaBLOGraphy: Restek at the 40th International Symposium on Capillary Chromatography and 13th GCxGC Symposium

Restek is proud to have numerous presentations in the orals scientific program for the 4oth ISCC and 13th GCxGC Symposium, which will take place in Riva del Garda, Italy in May. Exploding a Peak Capacity Increase Record by Using Hydrogen Carrier Gas for Comprehensive Two-Dimensional Gas Chromatography – Time-of-Flight Mass Spectrometry (Jack Cochran, Julie Kowalski, Christopher […]

ChromaBLOGraphy: MM’s QuEChERS cSPE GCxGC-ECD of PCBs and PBDEs at FPRW, or, Why Does this Blog Title Only Consist of Acronyms?

I only have time for a brief report from the Florida Pesticide Residue Workshop as I get ready to go to a full day of talks and meetings.  Michelle Misselwitz of Restek’s Innovations group presented the poster, “The QuEChERS Extraction Approach and Comprehensive Two-Dimensional Gas Chromatography of Halogenated Persistent Organic Pollutants in Cow Milk and [...]

ChromaBLOGraphy: Finally! A True Peak Capacity Increase for GCxGC

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 [...]

ChromaBLOGraphy: International Network of Environmental Forensics Conference – Cambridge, UK – The Invention of Mass Spectrometry and J.J. Thomson

I’m writing this post from St. John’s College at the University of Cambridge in the United Kingdom where I will be speaking at the International Network of Environmental Forensics Conference tomorrow on polychlorinated biphenyl (PCB) analysis with parallel dual-column comprehensive two-dimensional gas chromatography – time-of-flight mass spectrometry (2GCxGC-TOFMS).  I could wax on and on about […]

A Comprehensive Approach to Pesticide Residue Monitoring, Including Non-target Analysis, for Fruits, Vegetables, and Nuts, Using QuEChERS, LC-MS/MS, and GCxGC-TOFMS (PDF 2552kB)

...) demonstrates the increased resolving power of comprehensive two-dimensional gas chromatography. With one-dimensional pesticides and high-level matrix coextractives. In GC, this better separation can come from comprehensive two-dimensional...

ChromaBLOGraphy: NACRW 2013: Fun (and Science) in the Sun!

  Last week was the 50th Annual Florida Pesticide Residue Workshop…now officially named the North American Chemical Residue Workshop. The conference was held at a beautiful beach resort, but don’t be fooled though there was plenty of science. The program was jammed packed with presentations, panel discussions, forums, posters and exhibits. Topics ranged from pesticide [...]

News: Misselwitz and Rattray to Speak at the EPA’s 22nd Annual Quality Assurance Conference

From October 15–19, 2012, the U.S. Environmental Protection Agency (EPA) will hold its 22nd Annual Quality Assurance Conference in Region 6, Dallas, TX. Two Restek chemists, Michelle Misselwitz and Chris Rattray, will be making the trip south to present some … Continue reading

ChromaBLOGraphy: Dioxin 2011 Conference Starts Today in Brussels

The 31st International Symposium on Halogenated Persistent Organic Pollutants, aka Dioxin 2011, starts today in Brussels with the theme “Persistent Organic Pollutants (POPs) Science in the Heart of Europe”.  Restek will have an exhibit booth (nicely done by our Graphics team; more on that tomorrow!), that showcases our Rxi-5Sil MS (60m x 0.18mm x 0.10µm) [...]

ChromaBLOGraphy: Leandri van der Wat from University of Pretoria wins Best Student Oral Presentation Prize at ChromSAAMS 2012 in South Africa

As previously noted in my post, Niel Malan from University of Pretoria wins Best Student Poster Prize at ChromSAAMS 2012 in South Africa, my colleagues Chris Marvin (Environment Canada), Jef Focant (University of Liege, Belgium), Rob Trengove (Murdoch University, Australia), and I acted as judges for the best student presentations.  Leandri  van der Wat, an Honors student [...]

News: Evaluation of Dispersive and Cartridge Solid Phase Extraction (SPE) Cleanups for Multiresidue Pesticides in QuEChERS Extracts of Finished Tobacco Using GCxGC-TOFMS

Author(s): Michelle Misselwitz, Jack Cochran, and Julie Kowalski Restek Corporation Published By: Restek Corporation Year of Publication: 2013 Link: http://www.restek.com/Technical-Resources/Technical-Library/Foods-Flavors-Fragrances/fff_FFAN1823-UNV Abstract: Tobacco is a high-value production crop for the United States and ranks 6th in the amount of pesticides applied per … Continue reading

News: Applying Comprehensive Analysis to EPA Method 1613B Samples: Discover Those Compounds Usually Discounted in Environmental Samples

Author(s): Jayne de Vos1, Jack Cochran2, Eric J. Reiner3, Peter Gorst-Allman4 1. National Metrology Institute of South Africa, 2. Restek Corporation, 3. Ontario Ministry of the Environment, 4. LECO Africa Published By: Current Trends in Mass Spectrometry Issue: July 2013 … Continue reading

News: Achieving a Near-Theoretical Maximum in Peak Capacity Gain for the Forensic Analysis of Ignitable Liquids Using GC×GC-TOFMS

Author (s): Katie D. Nizio 1, Jack W. Cochran 2, and Shari L. Forbes 1 Centre for Forensic Science, University of Technology Sydney Restek Corporation Published By: Separations Issue: Volume 3, Issue 3 Year of Publication: 2016 Link: 10.3390/separations3030026 Abstract: At present, gas … Continue reading

ChromaBLOGraphy: GCxGC is the Star at 4th Multidimensional Chromatography Workshop!

My colleagues and I made the road trip to the Ontario Ministry of the Environment in Toronto for the 4th Multidimensional Chromatography Workshop.  This workshop organized by Eric Reiner at the MOE is a veritable who’s who in the world of GCxGC.  I personally love going to this workshop because of the wide variety of [...]

Enviro

YOUR GUIDE FOR Environmental Sampling and Analysis

ChromaBLOGraphy: GCxGC-FID of a Petroleum Diesel and Biodiesel Blend: Rtx-200 x Rxi-17Sil MS and Rxi-5ms x Rxi-17Sil MS

One of the benefits of going to the 8th GCxGC Symposium and 35th International Symposium on Capillary Chromatography is that you not only get to hear presentations by experts like Professor John Seeley of Oakland University, but you also get to interact with those same experts outside of the talks, which is a great learning [...]

Comprehensive 2D Gas Chromatography — Making GC Separations Work Harder

... of comprehensive two-dimensional gas chromatography (GC×GC) should — justifiably — match plot faithfully reproduce our archived or master analytical result? This must be addressed in the two-dimensional...

POPs: Stay Off! Stay Away! Stay Alive! Human Exposure and Food Control

... the fractionation step? Then go for comprehensive two-dimensional gas chromatography (GCxGC), where separation -step liquid chromatography (LC) setup. Such an LC setup includes multi-layer silica columns (acid, neutral...

News: Restek Chromatographers Lend Their Expertise to NEMC 2012

As in years past, Restek sent a contingent of environmental and air chromatography experts to the National Environmental Monitoring Conference (NEMC). This year’s event took place in Washington, DC, and featured talks from our own Michelle Misselwitz, Jason Herrington, and … Continue reading

ChromaBLOGraphy: Milk Matters – Using QuEChERS extraction approach with GCxGC determination

Last week I had the honor to present my work at the 31st International Symposium on Halogenated Persistent Organic Pollutants (Dioxin 2011). While it is still a work in progress, Jack Cochran and I evaluated the QuEChERS extraction approach with a silica SPE cleanup for PCBs and BFRs in cow milk and human breast milk. [...]

ChromaBLOGraphy: Book Review: Echoes of Life: What Fossil Molecules Reveal about Earth History.

The year 1936 marks the beginning of organic geochemistry. It started with Alfred Treibs’ discovery of porphyrins in petroleum; compounds that closely resemble chlorophylls in plant matter. Another 25 years would pass before scientists recognized that these compounds, known as biomarkers, could reveal insights into the evolution of plants and animals spanning a time frame […]

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

.../sec. GCxGC-TOFMS The LECO Pegasus 4D GCxGC-TOFMS was operated in comprehensive two-dimensional gas appeared for some pesticides, leading us to consider a relatively new technique, comprehensive two-dimensional...

QuEChERS Bibliography

... Comprehensive Two-Dimensional Gas Chromatography with Time-of-Flight Mass Spectrometry. (M.K. van der Lee, G . Comprehensive Two-Dimensional Gas Chromatography with Time-of-Flight Mass Spectrometric Detection...

ChromaBLOGraphy: 3rd Multidimensional Chromatography and GCxGC Workshop at Ontario Ministry of Environment in Toronto

The 3rd Multidimensional Chromatography and GCxGC Workshop took place at the Ontario Ministry of the Environment (MOE) in Toronto, Ontario, Canada on January 10, 2012.  The excellent lecture program was enjoyed by over 150 attendees and is listed below.  Restek helped sponsor the workshop, and contributed three speakers this year due to our extensive work with [...]

Evaluation of Dispersive and Cartridge Solid Phase Extraction (SPE) Cleanups for Multiresidue Pesticides in QuEChERS Extracts of Finished Tobacco Using GCxGC-TOFMS

.... Comprehensive two-dimensional gas chromatography time-of-flight mass spectrometry (GCxGC-TOFMS) was used supplement finished products we employed comprehensive two-dimensional gas chromatography time-of-flight mass...

News: Presentations Announced for AOAC 2012

The AOAC annual meeting is fast approaching. Beginning this Sunday, September 30th and running through next Wednesday, October 3rd, the 2012 AOAC meeting in Las Vegas, Nevada promises to be another exciting conference. The final program has been announced and … Continue reading

A Comprehensive Approach to Pesticide Residue Testing, Including Non-Target Analysis, for Fruits, Vegetables, and Nuts, Using QuEChERS, LC-MS/MS, and GCxGC-TOFMS

... power of comprehensive two-dimensional gas chromatography. With one-dimensional GC, the following pairs separation can come from comprehensive two-dimensional GC (GCxGC), an approach involving two separations...

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