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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)

..., Including Non-Target Analysis, for Fruits, Vegetables, and Nuts, Using QuEChERS, LC-MS/MS, and GCxGC-TOFMS preparation technique. Samples were analyzed by both GCxGC-TOFMS and LC-MS/MS. The foods chosen varied ... , QuEChERS sample preparation, GCxGC-TOFMS, LC-MS/MS...

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

..., Cartridge SPE, and GCxGC-TOFMS Regulatory requirements are driving the development of new multiresidue . The novel approach employedhere combines QuEChERS extraction, cartridge SPE cleanup, and GCxGC-TOFMS ... Pesticide, dietary supplement, cartridge SPE, GCxGC, TOFMS, GCxGC-TOFMS, QuEChERS, cSPE...

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

...-of-flight mass spectrometry (GCxGC-TOFMS) was used to evaluate biomarker ratios in several crude oils from oil. In this study, using 43 different biomarker ratios from GCxGC-TOFMS analysis, we identified one ... , "source oil identification", "comprehensive two-dimensional gas chromatography", GCxGC-TOFMS...

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

...-of-flight mass spectrometry (GCxGC-TOFMS) was used to evaluate biomarker ratios in several crude oils from oil. In this study, using 43 different biomarker ratios from GCxGC-TOFMS analysis, we identified one ... , "source oil identification", "comprehensive two-dimensional gas chromatography", GCxGC-TOFMS...

High Quality Analysis of Pesticides in Marijuana Using QuEChERS, Cartridge SPE Cleanup, and GCxGC-TOFMS (PDF 672kB)

... Cleanup, and GCxGC-TOFMS By Jack Cochran, Julie Kowalski, Sharon Lupo, Michelle Misselwitz, and Amanda by GCxGC-TOFMS. Acceptable recoveries were obtained for most pesticides, and incurred pesticide residues...

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

... Pesticides in QuEChERS Extracts of Finished Tobacco Using GCxGC-TOFMS By Michelle Misselwitz, Jack Cochran . Comprehensive two-dimensional gas chromatography time-of-flight mass spectrometry (GCxGC-TOFMS) was used...

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

...EChERS sample preparation technique. Samples were analyzed by both GCxGC-TOFMS and LC-MS/MS. The foods chosen of GCxGC-TOFMS and LC-MS/MS could be assessed. Commodities tested were red bell pepper, cucumber, black ... and processed using a QuEChERS sample preparation technique. Samples were analyzed by both GCxGC-TOFMS and LC ... "non-target pesticide", "QuEChERS sample preparation", LC-MS/MS, GCxGC-TOFMS...

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

... Pegasus 4D GCxGC-TOFMS Notes See application note GNAN1338 for extraction and cleanup details. A 1.5 m of the separating power provided by GCxGC with time-of-flight mass spectrometry (TOFMS), it is easy to produce...

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

...-of-flight mass spectrometry (GCxGC-TOFMS) was used to evaluate biomarker ratios in several crude oils from oil. In this study, using 43 different biomarker ratios from GCxGC-TOFMS analysis, we identified one ... Comprehensive two-dimensional gas chromatography time-of-flight mass spectrometry (GCxGC-TOFMS...

ChromaBLOGraphy: GCxGC-TOFMS of Riser Pipe Oil from BP Gulf Oil Spill

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 [...]

Restek Advantage, 2012.1 (PDF 14846kB)

... range for semivolatiles…pp. 8–9 • QuEChERS with LC-MS/MS and GCxGC-TOFMS for comprehensive pesticide LC-MS/MS and GCxGC-TOFMS. There’s something for everyone in this Advantage. We hope it helps you...

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 spectrometry (GCxGC-TOFMS) as the determinative technique [5]. Analyzing tobacco using GCxGC proved ... EChERS extracts of finished tobacco products using GCxGC-TOFMS. Cleanup with dSPE tubes containing 7.5 mg of GCB...

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

Comparing Pesticide Residues in Amish and Commercially Grown Strawberries and Spinach Using QuEChERS, Various dSPE Sorbents, and GC-TOFMS (PDF 1781kB)

... 4D GCxGC-TOFMS was used for GC-TOFMS analysis and all data were processed with ChromaTOF software /sec Instrument LECO Pegasus 4D GCxGC-TOFMS Notes Sample Preparation: Sample: 10 g of homogenized strawberries...

Fast Screening of Recalled Tylenol for Tribromoanisole and Related Adulterants (PDF 283kB)

... Acquisition Rate: 5 spectra/sec Instrument LECO Pegasus 4D GCxGC-TOFMS Notes Q210 = PSA Q251 = PSA and C18 spectra/sec Instrument LECO Pegasus 4D GCxGC-TOFMS 5 Conclusions Shown here is a QuEChERS multi...

ChromaBLOGraphy: Julie Kowalski Presents FPRW Poster on PAHS in Sugarcane Products: QuEChERS, GC-MS, GCxGC-TOFMS, Rxi-17Sil MS

Reporting again from the Florida Pesticide Residue Workshop with the news that Julie Kowalski of Restek’s Innovations group just presented the poster, “Comprehensive Screening for PAHs in Sugarcane Products after QuEChERS with Sweet Separations using an Rxi-17Sil MS GC Column, GC-MS, and GCxGC-TOFMS”.  This poster represents the combined work of a great team of colleagues, [...]

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

Large Volume Splitless Injection Using an Unmodified Split/Splitless Inlet and GC-TOFMS for Pesticides and Brominated Flame Retardants (PDF 1051kB)

... Acquisition Rate: 10 spectra/sec Instrument LECO Pegasus 4D GCxGC-TOFMS Notes Carrier Gas Flow: 2 /sec Instrument LECO Pegasus 4D GCxGC-TOFMS Notes Carrier Gas Flow: 2 mL/min. corrected constant flow via...

Developing New Methods for Pesticides in Dietary Supplements (PDF 4634kB)

...: 5 spectra/sec. Instrument LECO Pegasus 4D GCxGC-TOFMS Notes Sample Preparation: Wetting:1 g /sec. Instrument LECO Pegasus 4D GCxGC-TOFMS Notes Sample Preparation: Wetting: 1 g of dandelion root powder...

ChromaBLOGraphy: Which GC instrument should I use for the analysis of pesticides in herbal tea? GC-MS/MS or GCxGC-TOFMS?

You may remember a while ago I posted a blog about the analysis of herbal tea using QuEChERS and GCxGC-TOFMS.   The LECO Pegasus GCxGC-TOFMS is a great instrument for analyzing complex samples because of the comprehensive chromatographic separation achieved (two columns with different selectivities).  The GCxGC-TOFMS also excels at non-target screening of compounds.  Lucky for […]

ChromaBLOGraphy: Comprehensive Pesticide Screening Using QuEChERS, LC-MS/MS, and GCxGC-TOFMS at PittCon 2010

A recent collaboration with Applied Biosystems used a sensitive LC-MS/MS (4000 QTRAP) with a Restek Ultra Aqueous C18 column as the instrumental determination step for pesticides in QuEChERS extracts of red bell pepper, lemon, spinach, hazelnuts, raisins, and cucumber. Those same QuEChERS extracts were analyzed by a LECO Pegasus 4D GCxGC-TOFMS with Rxi-5Sil MS and [...]

ChromaBLOGraphy: First QuEChERS Extraction of Marijuana with GCxGC-TOFMS Analysis, dudes…

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 [...]

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

... employed here combines QuEChERS extraction, cartridge SPE cleanup, and GCxGC-TOFMS analysis, and results the application of QuEChERS, cSPE, and GCxGC-TOFMS with an Rxi-5Sil MS x Rtx-200 column combination to quantify ... The novel approach used here combines QuEChERS extraction, cartridge SPE cleanup, and GCxGC-TOFMS ... "dietary supplements", "cartridge SPE", GCxGC, GCxGC-TOFMS, Pesticides, QuEChERS, cSPE, GC-TOFMS...

Ensure Successful Polycyclic Aromatic Hydrocarbon (PAH) Analysis—Choose Specialized Rxi-PAH Columns (PDF 7240kB)

...; Acquisition Range: 45-550 amu; Spectral Acquisition Rate: 5 spectra/sec; Instrument: LECO Pegasus 4D GCxGC-TOFMS . For complete instrument conditions, visit www.restek.com and enter GC_FF1223 in the search. Red line = oven...

Restek Advantage, 2011.1 (PDF 3826kB)

...EChERS extraction with the accuracy of GCxGC-TOFMS arepresented here. QuEChERS Saves Time and MoneyWhile Qu ).ConclusionCombining QuEChERS extraction with GCxGC-TOFMS, using Rxi-17Sil MS and Rxi-1mscolumns shows great...

ChromaBLOGraphy: The Promise of True Peak Capacity Increase GCxGC Realized

I mentioned in my last ChromaBLOGraphy post, Phthalate-Free Personal Care Products?, that we used GCxGC-TOFMS to determine phthalates in a Las Vegas Wash water sample.  While it doesn’t dive into specific compound identification, we recently published the first demonstration of a near theoretical maximum peak capacity gain for GCxGC (approximately 9x) in an open access […]

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 […]

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

Author(s): Jack Cochran1, Julie Kowalski1, Jason Thomas1, Michelle Misselwitz1, Rebecca Wittrig2*, Andre Schreiber3 1Restek Corporation, 110 Benner Circle, Bellefonte, Pennsylvania 16823, USA 2AB SCIEX, 353 Hatch Drive, Foster City, California 94404, USA 3AB SCIEX Research and Development, 71 Four Valley … Continue reading

GCxGC Analysis of Complex Petroleum Hydrocarbons: Sulfur Speciation in Diesel

... is an extremely complex middle distillate product containing mainly aliphatic compounds. Using GCxGC-TOFMS, Kohl :  GCxGC-TOFMS chromatogram (contour plot) of diesel analyzed with orthogonal Rxi-1ms and Rtx-FLD columns ... Comprehensive 2D GC, also known as GCxGC, is a powerful technique with a great deal of potential thousands—of components. While GCxGC is still considered emerging technology and is used primarily...

Analytical Method for Polycyclic Aromatic Hydrocarbons (PAHs) in Yerba Mate Tea Using Modified QuEChERS, Solid Phase Extraction and GC-TOFMS and GC-MS/MS (PDF 634kB)

...: 5 spectra/sec Instrument LECO Pegasus 4D GCxGC-TOFMS Peaks tR (sec) 1. Benz[a]anthracene 1 Mate Tea Using Modified QuEChERS, Solid Phase Extraction and GC-TOFMS and GC-MS/MS By Julie Kowalski...

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

High-Quality Analysis of Pesticides in Cannabis Using QuEChERS, Cartridge SPE Cleanup, and GCxGC-TOFMS

... a simple QuEChERS extraction approach with cartridge SPE (cSPE) cleanup, followed by GCxGC-TOFMS had only 1-dimensional GC been used. With GCxGC-TOFMS, cypermethrin was unequivocally identified ... challenging due to matrix complexity. The use of QuEChERS, cartridge SPE cleanup, and GCxGC-TOFMS as presented...

ChromaBLOGraphy: High Quality Analysis of Pesticides in Marijuana using QuEChERS, Cartridge SPE Cleanup, and GCxGC-TOFMS

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 [...]

ChromaBLOGraphy: Gimme some sugar, baby. Analyte Protectants in Pesticide Analysis.

Scott’s post, “The Solvent Shield”, reminds me of using “analyte protectants” (APs) for determining pesticides in baby food via QuEChERS and GCxGC-TOFMS. A matrix-enhanced response occurs for many polar pesticides in food extracts, versus solvent alone, leading analysts to use “matrix-matched standards” (MMSs) for quantification (standards prepared in pesticide-free food extracts). Sugars and other hydrogen-bonding [...]

ChromaBLOGraphy: Mining through complex data and non-target analysis is made easier with GCxGC-TOFMS

I am currently working on a project looking for pesticides in herbal tea.  At this point, I am using the contents of one tea bag (~1.5g) and 10mL of freshly boiled water with a QuEChERS extraction.  I am still working through the details on the impact of the hot water and what type of cleanup [...]

ChromaBLOGraphy: Pesticides in Dietary Supplements

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, [...]

News: QuEChERS, GC Smoke Out Tobacco Pesticides

Author(s): Michelle Misselwitz, Jack Cochran, Julie Kowalski Restek Corporation Published By: Chromatography Techniques Year of Publication: 2014 Link: http://www.chromatographytechniques.com/articles/2013/12/quechers-gc-smoke-out-tobacco-pesticides Abstract: Pesticides are used heavily on tobacco in order to increase crop production value; however, limited regulation creates the potential for high … Continue reading

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: 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 [...]

ChromaBLOGraphy: Environmental Forensics, Water Pollution, Pansteatitis and Crocodiles dying in Kruger National Park

I’ve been fortunate enough to travel in South Africa and see some of its impressive wildlife, including crocodiles in Kruger National Park, the country’s premiere wildlife watching destination.  During one of my trips there, a colleague with the South African Police Service, Roger Dixon, was involved in an environmental forensics study to determine why massive [...]

ChromaBLOGraphy: GC-MS with Hydrogen Carrier Gas

At the LECO Australia Separation Science Users Group Meeting last Friday in Sydney, my colleague from South Africa, Peter Gorst-Allman, made a presentation on using hydrogen carrier gas for GC-TOFMS and GCxGC-TOFMS.  His preliminary results were quite encouraging, as he noted no obvious deterioration of mass spectra quality for a wide variety of compounds, including [...]

ChromaBLOGraphy: Petroleum Biomarkers and Tarballs at the 36th International Symposium on Capillary Chromatography and the 9th GCxGC Symposium

I’d like to invite my colleagues to a preliminary view of an upcoming presentation in Riva del Garda, Italy for the 36th International Symposium on Capillary Chromatography and the 9th GCxGC Symposium.  We’ve been working on characterizing tarballs that could have originated from the Deepwater Horizon oil spill in the Gulf of Mexico in 2010.  [...]

ChromaBLOGraphy: Pesticides on Roses – The QuEChERS Sample Preparation Approach

A couple of years ago we had a summer intern in our Innovations lab, Shane Stevens, whose project with us was developing a QuEChERS sample preparation approach for pesticides on cut flowers, including roses.  He presented his work at the 12th Annual Environmental Chemistry Student Symposium at The Pennsylvania State University (PSU) with the distinction of [...]

ChromaBLOGraphy: Testing for pesticides in tobacco… QuEChERS makes it easy!!

Whenever it is time to analyze pesticides in complex matrices I always hope that we can use the QuEChERS sample preparation approach and not something more laborious!  The Quick-Easy-Cheap-Effective-Rugged-Safe method was developed for multiresidue pesticides in fruits and vegetables, however we have been using this approach outside of the typical fruit and vegetable matrices with [...]

ChromaBLOGraphy: Analyzing pesticides in herbal tea using QuEChERS and GCxGC-TOFMS of course!

Herbal tea, a non-caffeinated drink made from plants, herbs, or spices has been used throughout history for its potential medicinal benefit.   Various herbal material is mixed depending on the desired medicinal or flavor properties for the tea.   As with any plant based commodity, there is the potential for pesticide residues to remain in the final […]

ChromaBLOGraphy: US Drug Enforcement Administration Exerts Federal Control Over Synthetic Marijuana Compounds (JWH-type; CP-47,497; and Cannabicyclohexanol)

I heard on the news the other day that the DEA is taking action to control synthetic marijuana compounds such as JWH-018, JWH-073, and JWH-200, in addition to a couple others.  It hasn’t been that long ago that herbal “incenses” that provide a pot-like high when smoked popped up for sale on the internet, and [...]

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 [...]

ChromaBLOGraphy: This isn’t your average CSI, the International Network of Environmental Forensics (INEF)

Next week (June 10-12) at the Pennsylvania State University (PSU) the International Network of Environmental Forensics conference is being held.  This isn’t your typical crime scene investigation but, as defined by the INEF, “environmental forensics is the use of scientific techniques to identify the source, age, and timing of a contaminant into the environment.”  We [...]

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: Spring is finally here! Unfortunately so are the ticks…

After a long and cold winter here at the Restek headquarters in Bellefonte, PA, USA it seems that spring is finally here!  It is so nice this time of year to get outside and enjoy the weather and the beautiful outdoors that Pennsylvania has to offer.   Unfortunately after a hike in the woods there is […]

ChromaBLOGraphy: Wildfires in the Western United States: The smoke can be as dangerous as the flames, especially for firefighters.

The drought continues and wildfires are raging across the Western United States.  In Washington State alone, the wildfires have burned over 1400 square miles (that’s 3600 km2).  Brave men and women from across the United States are coming to the aid and trying to contain these historical fires.  Unfortunately lives of the firefighters are in […]

ChromaBLOGraphy: Phthalate-Free Personal Care Products?

In her recent ChromaBLOGraphy posts, Minimizing Phthalate Interferences Using the Rtx-CLPesticides/Rtx-CLPesticides2 Columns and EPA Regulated Phthalates FREE?, my colleague Dan Li pointed out the ubiquitous nature of phthalates in our world because of their widespread use in plastic consumer products, and that phthalates likely have adverse human health effects, including as endocrine disruptors.  Any of […]

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

ChromaBLOGraphy: Donald G. Patterson, Jr. Wins First GCxGC Scientific Achievement Award

Last week at the 8th GCxGC Symposium, in conjunction with the 35th International Symposium on Capillary Chromatography, Don Patterson, Jr. was awarded the inaugural GCxGC Scientific Award.  This award was cosponsored by Restek and LECO.  Don retired from the Centers for Disease Control and Prevention (CDC) after an illustrious career specializing in human exposure assessment [...]

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. [...]

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

ChromaBLOGraphy: Shoot-and-Dilute GC – A Way to Keep GC Systems Up Longer to Help Lower Cost of Analyses

Dilute-and-shoot LC-MS/MS is a selective and sensitive technique often used in determining pesticides in foods.  Because of competitive ionization effects seen with electrospray (ESI) and atmospheric pressure chemical ionization (APCI) methods, quantitative accuracy suffers for trace compounds of interest when matrix coelutions occur.  Dilution of extracts (or sometimes raw samples) is a good way of […]

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

Comparing Pesticide Residues in Amish and Commercially Grown Strawberries and Spinach Using QuEChERS, Various dSPE Sorbents, and GC-TOFMS

... Pegasus 4D GCxGC-TOFMS was used for GC-TOFMS analysis and all data were processed with ChromaTOF software SPE cleanup, and GC-TOFMS analysis were used to assess pesticide levels in strawberries and spinach from both ... QuEChERS extraction, dSPE cleanup, and GC-TOFMS analysis were used to assess pesticide residue...

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