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Solid Phase Extraction > QuEChERS Products

Browse our complete line of QuEChERS Products

QuEChERS Single-Component Reference Standards

...Pesticide analysis is fast and simple using QuEChERS methods. Use these cost-effective QuEChERS ... QuEChERS Single-Component Reference Standards ... Sample Handling , Solid Phase Extraction , QuEChERS Products ... Click here for more information on our QuEChERS products. ... Ready to use for QuEChERS extractions—no dilutions necessary....

QuEChERS Internal Standard Mix for LC-MS/MS Analysis (Nicarbazin)

...Pesticide analysis is fast and simple using QuEChERS methods. Use these cost-effective QuEChERS ... QuEChERS Internal Standard Mix for LC-MS/MS Analysis ... Sample Handling , Solid Phase Extraction , QuEChERS Products ... Click here for more information on our QuEChERS products. ... Ready to use for QuEChERS extractions—no dilutions necessary. ...

QuEChERS Quality Control Standards for GC-MS Analysis

...Pesticide analysis is fast and simple using QuEChERS methods. Use these cost-effective QuEChERS ... QuEChERS Quality Control Standards for GC-MS Analysis ... Sample Handling , Solid Phase Extraction , QuEChERS Products ... Click here for more information on our QuEChERS products. ... Ready to use for QuEChERS extractions—no dilutions necessary. ...

AOAC QuEChERS Triphenylphosphate Solution

...Following QuEChERS methods is even quicker and easier when you use Restek method and Partitioning with Magnesium Sulfate). Our suite of AOAC QuEChERS standards includes internal standards mix ... AOAC QuEChERS Triphenylphosphate Solution ... Sample Handling , Solid Phase Extraction , QuEChERS Products ... 2007.01. Cost-effective QuEChERS standards can be used without dilutions for greater lab...

QuEChERS Performance Standard B (7 components)

...QuEChERS Performance Standard B ... Sample Handling , Solid Phase Extraction , QuEChERS Products ... Designed for use in all QuEChERS methods for pesticides in fruits and vegetables...

Q-sep QuEChERS Extraction Salts

...QuEChERS methods are fast, easy, and cost-effective, and Restek Q-sep products make QuEChERS ... Q-sep QuEChERS Extraction Salts ... Sample Handling , Solid Phase Extraction , QuEChERS Products ... Click here for more information on our QuEChERS products :► Choosing the Right QuEChERS Extraction Salt ... 15662) QuEChERS methods. ...

Q-sep QuEChERS dSPE Tubes for Extract Cleanup

Fast, Simple Sample Prep for Multiresidue Pesticide Analysis

...QuEChERS methods are fast, easy, and cost-effective, and Restek Q-sep products make QuEChERS —no specialized equipment or glassware is required. Prepare samples more efficiently with a complete line of QuEChERS ... Q-sep QuEChERS dSPE Tubes for Extract Cleanup ... Sample Handling , Solid Phase Extraction , QuEChERS Products ... Click here for more information on our QuEChERS products :► How to Choose the Right dSPE for QuEChERS ... original unbuffered, AOAC (2007.01), European (EN 15662), and mini-multiresidue QuEChERS methods. ...

AOAC QuEChERS IS Solution (2 components)

...Following QuEChERS methods is even quicker and easier when you use Restek method and Partitioning with Magnesium Sulfate). Our suite of AOAC QuEChERS standards includes internal standards mix ... AOAC QuEChERS IS Solution ... 2007.01. Cost-effective QuEChERS standards can be used without dilutions for greater lab...

Accessories for Q-sep 3000 Centrifuge

...Sample Handling , Solid Phase Extraction , QuEChERS Products...

QuEChERS Internal Standard Mix for GC-NPD and LC-MS/MS Analysis (2 components)

...Pesticide analysis is fast and simple using QuEChERS methods. Use these cost-effective QuEChERS ... QuEChERS Internal Standard Mix for GC-NPD and LC-MS/MS Analysis ... Sample Handling , Solid Phase Extraction , QuEChERS Products ... Click here for more information on our QuEChERS products. ... Ready to use for QuEChERS extractions—no dilutions necessary. ...

QuEChERS Internal Standard Mix for GC-MS Analysis (6 components)

...Pesticide analysis is fast and simple using QuEChERS methods. Use these cost-effective QuEChERS ... QuEChERS Internal Standard Mix for GC-MS Analysis ... Sample Handling , Solid Phase Extraction , QuEChERS Products ... Click here for more information on our QuEChERS products. ... Ready to use for QuEChERS extractions—no dilutions necessary. ...

AOAC QuEChERS QC Spike Mix (27 components)

...Following QuEChERS methods is even quicker and easier when you use Restek method and Partitioning with Magnesium Sulfate). Our suite of AOAC QuEChERS standards includes internal standards mix ... AOAC QuEChERS QC Spike Mix ... Sample Handling , Solid Phase Extraction , QuEChERS Products ... 2007.01. Cost-effective QuEChERS standards can be used without dilutions for greater lab...

QuEChERS Performance Standard A (16 components)

...QuEChERS Performance Standard A ... Sample Handling , Solid Phase Extraction , QuEChERS Products ... !QuEChERS performance standards kits are ideal for broad class work because they provide a wide range ... Designed for use in all QuEChERS methods for pesticides in fruits and vegetables...

QuEChERS Performance Standard C (17 components)

...QuEChERS Performance Standard C ... Sample Handling , Solid Phase Extraction , QuEChERS Products ... Designed for use in all QuEChERS methods for pesticides in fruits and vegetables...

QuEChERS Performance Standards Kit

...Cat.# 31153: QuEChERS Performance Standard A (16 components)Acephate (30560 : QuEChERS Performance Standard B (7 components)gamma-BHC (Lindane) (58 ... QuEChERS Performance Standards Kit ... Sample Handling , Solid Phase Extraction , QuEChERS Products ... Designed for use in all QuEChERS methods for pesticides in fruits and vegetables evaluation of QuEChERS extraction and cleanup efficiencies, and optimization of GC and LC instrumental...

Empty Centrifuge Tubes, FEP

...Sample Handling , Solid Phase Extraction , QuEChERS Products ... Click here for more information on our QuEChERS products....

Empty Centrifuge Tubes, Polypropylene

...Sample Handling , Solid Phase Extraction , QuEChERS Products ... Click here for more information on our QuEChERS products....

Q-sep 3000 Centrifuge for QuEChERS

... specifically designed for QuEChERS methodology. This compact, quiet, yet powerful unit spins at the 3,000 g ... Q-sep 3000 Centrifuge for QuEChERS ... Sample Handling , Solid Phase Extraction , QuEChERS Products ... Click here for more information on our QuEChERS products....

Q-sep Tube Racks

...Sample Handling , Solid Phase Extraction , QuEChERS Products...

Q-sep Bottle Top Solvent Dispenser

...Accurately and precisely dispense liquids for QuEChERS extractions with this versatile pump ... Sample Handling , Solid Phase Extraction , QuEChERS Products ... .5 mL increments)—ideal for QuEChERS methods! Base features...

LC Multiresidue Pesticide Standard #7 (7 components)

Organonitrogen Compounds

... standards, Ultra and Pinnacle DB LC columns, Q-sep QuEChERS sample prep products, accessories, and more...

LC Multiresidue Pesticide Standard #8 (Hydramethylnon)

Organonitrogen Compounds

... standards, Ultra and Pinnacle DB LC columns, Q-sep QuEChERS sample prep products, accessories, and more...

LC Multiresidue Pesticide Standard #9 (7 components)

Carbamate/Uron Compounds

... standards, Ultra and Pinnacle DB LC columns, Q-sep QuEChERS sample prep products, accessories, and more...

LC Multiresidue Pesticide Standard #10 (Carbendazim)

Carbamate/Uron Compounds

... standards, Ultra and Pinnacle DB LC columns, Q-sep QuEChERS sample prep products, accessories, and more...

GC Multiresidue Pesticide Standard #9 (8 components)

Organophosphorus Compounds

... standards, Rxi-5ms GC columns, Q-sep QuEChERS sample preparation, inlet liners, accessories, and more...

LC Multiresidue Pesticide Standard #1 (13 components)

Organophosphorus Compounds

... standards, Ultra and Pinnacle DB LC columns, Q-sep QuEChERS sample prep products, accessories, and more...

LC Multiresidue Pesticide Standard #2 (16 components)

Carbamate/Uron Compounds

... standards, Ultra and Pinnacle DB LC columns, Q-sep QuEChERS sample prep products, accessories, and more...

LC Multiresidue Pesticide Standard #5 (30 components)

Organonitrogen Compounds

... standards, Ultra and Pinnacle DB LC columns, Q-sep QuEChERS sample prep products, accessories, and more...

LC Multiresidue Pesticide Standard #6 (28 components)

Organonitrogen Compounds

... standards, Ultra and Pinnacle DB LC columns, Q-sep QuEChERS sample prep products, accessories, and more...

GC Multiresidue Pesticide Standard #1 (16 components)

Organophosphorus Compounds

... standards, Rxi-5ms GC columns, Q-sep QuEChERS sample preparation, inlet liners, accessories, and more...

GC Multiresidue Pesticide Standard #3 (25 components)

Organonitrogen Compounds

... standards, Rxi-5ms GC columns, Q-sep QuEChERS sample preparation, inlet liners, accessories, and more...

GC Multiresidue Pesticide Standard #4 (28 components)

Organonitrogen Compounds

... standards, Rxi-5ms GC columns, Q-sep QuEChERS sample preparation, inlet liners, accessories, and more...

GC Multiresidue Pesticide Standard #5 (34 components)

Organonitrogen Compounds

... standards, Rxi-5ms GC columns, Q-sep QuEChERS sample preparation, inlet liners, accessories, and more...

GC Multiresidue Pesticide Standard #6 (18 components)

Synthetic Pyrethroid Compounds

... standards, Rxi-5ms GC columns, Q-sep QuEChERS sample preparation, inlet liners, accessories, and more...

GC Multiresidue Pesticide Standard #7 (10 components)

Herbicide Methyl Esters

... standards, Rxi-5ms GC columns, Q-sep QuEChERS sample preparation, inlet liners, accessories, and more...

GC Multiresidue Pesticide Standard #8 (24 components)

Organophosphorus Compounds

... standards, Rxi-5ms GC columns, Q-sep QuEChERS sample preparation, inlet liners, accessories, and more...

LC Multiresidue Pesticide Standard #3 (38 components)

Carbamate/Uron Compounds

... standards, Ultra and Pinnacle DB LC columns, Q-sep QuEChERS sample prep products, accessories, and more...

LC Multiresidue Pesticide Standard #4 (63 components)

Organonitrogen Compounds

... standards, Ultra and Pinnacle DB LC columns, Q-sep QuEChERS sample prep products, accessories, and more...

GC Multiresidue Pesticide Standard #2 (40 components)

Organochlorine Compounds

... standards, Rxi-5ms GC columns, Q-sep QuEChERS sample preparation, inlet liners, accessories, and more...

GC Multiresidue Pesticide Kit

... analysis: reference and internal standards, Rxi-5ms GC columns, Q-sep QuEChERS sample preparation, inlet ... and internal standards, Rxi-5ms GC columns, Q-sep QuEChERS sample preparation, inlet liners, accessories...

LC Multiresidue Pesticide Kit

... and Pinnacle DB LC columns, Q-sep QuEChERS sample prep products, accessories, and more ... and internal standards, Ultra and Pinnacle DB LC columns, Q-sep QuEChERS sample prep products, accessories...

QuEChERS Made Even Easier: Comprehensive Solutions Simplify Sample Prep and Analysis (PDF 5489kB)

...Sample Prep QuEChERS Made Even Easier: Comprehensive Solutions Simplify Sample Prep and Analysis • New free-flowing salts in slim packets make extraction a snap. • Complete line of easy-to-use QuEChERS ... QuEChERS...

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

...Technical Article High-Quality Analysis of Pesticides in Cannabis Using QuEChERS, Cartridge SPE , we combined a simple QuEChERS extraction approach with cartridge SPE (cSPE) cleanup, followed...

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

... preparation with QuEChERS improves turnaround time for emergency response analysis situations. • Prepackaged QuEChERS extraction salts and snap-and-shoot standards reduce human error and save time. • Rugged ... Tylenol, Tribromoanisole, adulterants, TBA, TBP, quechers, Rxi-5Sil MS, dSPE...

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

... a need for methods to detect pesticides in these complex, largely botanical products. QuEChERS offers technicians. Here we demonstrate a procedure that incorporates a QuEChERS extraction, cSPE cleanup ... dietary supplements, quechers, cSPE, GMP, PAM 303, pesticides, multiresidue, sample prep...

QuEChERS Sample Preparation Procedures (PDF 2089kB)

...QuEChERS Sample Preparation Procedures cat.# 25847, 25848, 25849, 25850, 25851, 25852, 26123 preparation technique: QuEChERS (“catchers”)! Starting with a properly homogenized sample, QuEChERS is a two ... quechers...

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

...General Applications Determining Pesticides in Dietary Supplements with QuEChERS Extraction . The novel approach employedhere combines QuEChERS extraction, cartridge SPE cleanup, and GCx ... Pesticide, dietary supplement, cartridge SPE, GCxGC, TOFMS, GCxGC-TOFMS, QuEChERS, cSPE...

Fast, Simple QuEChERS Extraction and Cleanup of Pesticide Residue Samples (PDF 1180kB)

...Sample Preparation Applications Chromatography Products Fast, Simple QuEChERS Extraction mixtures. innovative chromatography solutions Quick, Easy, Cheap, Effective, Rugged, and Safe, the QuEChERS ... sample prep, sample preparation, QuEChERS, dSPE, multiresidue, pesticides, Q-Sep...

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 GCx GC-TOFMS Abstract Food commodities were fortified with pesticides and processed using the QuEChERS sample...

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

... Grown Strawberries and Spinach Using QuEChERS, Various dSPE Sorbents, and GC-TOFMS By Julie Kowalski , Innovations Chemist, and Jack Cochran, Director of New Business and Technology Abstract QuEChERS extraction ... pesticide residue, strawberry, spinach, sorbent, GC-TOFMS, QuEChERS, pesticide, dSPE...

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)

... Mate Tea Using Modified QuEChERS, Solid Phase Extraction and GC-TOFMS and GC-MS/MS By Julie Kowalski -intensive modified QuEChERS extraction and silica solid phase extraction (SPE) sample cleanup method was developed...

QuEChERS Approach

... samples more quickly, easily, and cost-effectively with QuEChERS QuEChERS Savings withQuEChERS ... QuEChERs, dSPE...

Mitigating Matrix Effects: Examination of Dilution, QuEChERS, and Calibration Strategies for LC-MS/MS Analysis of Pesticide Residues in Diverse Food Types (PDF 1561kB)

...Food Safety Applications Mitigating Matrix Effects: Examination of Dilution, QuEChERS interferences, QuEChERS sample preparation and dilution, in combination with the compensation strategy...

QuEChERS Solutions

Learn how to use the QuEChERS approach to perform faster, easier sample preparation and cleanup for multiresidue pesticide analysis. Q-sep QuEChERS products save time, mon...

News: QuEChERS: The Concept

Author(s): Julie Kowalski, Amanda Rigdon, and Jack Cochran Restek Corporation Published By: Separation Science Issue: vol. 5, issue 8 Year of Publication: 2013 Link: For the full print issue, visit http://www.sepscience.com/docs/Bespoke/Editions/SepSci/Sepsci0813eu.pdf?utm_source=iContact&utm_medium=email&utm_campaign=eLearning%20Newsletter%20-%20Europe%20Sep%20Sci&utm_content= Abstract: The original QuEChERS sample preparation methods were designed for … Continue reading

QuEChERS Bibliography

... International 86 (2003) 412.) QuEChERS—A Mini-Multiresidue Method for the Analysis /Partitioning and Clean-up by Dispersive SPE (QuEChERS-method). (EN 15662 Version 2008...

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 pesticide residues remain on the final product. We used the Quick–Easy–Cheap–Effective–Rugged–Safe (QuEChERS...

News: QuEChERS: A Primer

Author(s): Julie Kowalski and Jack Cochran Restek Corporation Published By: Separation Science Issue: vol. 4, issue 12 Year of Publication: 2012 Link: http://www.sepscience.com/Techniques/Sample-Prep/Articles/865-/QuEChERS-A-Primer For the full print issue, visit http://www.sepscience.com/docs/Bespoke/Editions/SepSci/Sepsci1012eu.pdf?utm_source=iContact&utm_medium=email&utm_campaign=eLearning%20Newsletter%20-%20Europe%20Sep%20Sci&utm_content= Abstract: Quick, Easy, Cheap, Effective, Rugged and Safe, the QuEChERS (pronounced “catchers”) … Continue reading

Restek Advantage, 2011.1 (PDF 3826kB)

... for PAHs in Seafood:Reduce Sample Prep from Days to Hours Using QuEChERS and GCxGC By Jack Cochran , Director of New Business and Technology •Prepare samples in hours vs. days, using QuEChERS instead...

ChromaBLOGraphy: QuEChERS Training and Education at Restek

As part of its ongoing commitment to training and education, Jason Thomas (Sample Preparation Product Specialist) and Corby Hilliard (Innovations Chemist) recently conducted another hands-on QuEChERS class in our Innovations Laboratory for a group of Restek employees.  The Quick – Easy – Cheap – Effective – Rugged – Safe sample preparation method has not only [...]

ChromaBLOGraphy: QuEChERS Weigh Lab Hack

Use a 150 mL beaker to hold your QuEChERS 50 mL centrifuge tubes for weighing samples out.  Put the spout of the beaker towards your weigh hand (I’m a lefty, as you can tell from the photos), and then allow the tube to set in the spout, which will angle the tube perfectly for your spatula […]

News: QuEChERS: Beyond the Basics

Author(s): Julie Kowalski and Jack Cochran Restek Corporation  Published By: Separation Science Issue: vol. 5, issue 4 Year of Publication: 2013 Link: http://www2.sepscience.com/Techniques/Sample-Prep/Articles/1863-/QuEChERS-Beyond-the-Basics For the full print issue, visit http://www.sepscience.com/docs/Bespoke/Editions/SepSci/Sepsci0413eu.pdf?utm_source=iContact&utm_medium=email&utm_campaign=eLearning%20Newsletter%20-%20Europe%20Sep%20Sci&utm_content= Abstract: QuEChERS is a sample preparation approach that was designed … Continue reading

ChromaBLOGraphy: Shortcut: AOAC QuEChERS protocol

Here is our checklist style protocol based on the AOAC 2007.01 QuEChERS method. The document describes producing spiked samples at 10 ppb and no spiked samples that are used to determine incurred pesticides. Commodity samples that are not spiked as also used to product matrix-matched standards. During method development we usually test more than one […]

ChromaBLOGraphy: QuEChERS – Where to start?

Enjoy the tip!* I am often asked for QuEChERS product recommendations. Usually the request is something like, “I need to test pesticides in _____” and that blank can be just about anything…sometimes not even food. Unless it is something I have tested before, I usually take a quick look online to determine the approximate composition […]

ChromaBLOGraphy: QuEChERS Workshops in South Africa

One of the best things about working at Restek is their commitment to continuing education for chromatographers, both inside and outside of their doors. This takes many forms, including the seminars produced by Rick Parmely, our Training Director, and through other efforts like the QuEChERS workshops I’m currently doing in South Africa. In the last [...]

ChromaBLOGraphy: Shortcut: QuEChERS EN and Original Methods Protocol

  I work with a group of colleagues on a lot of projects that use QuEChERS. For more information about QuEChERS take a look at these A Primer, Beyond the Basics, The Concept. We developed a quick protocol for performing generic QuEChERS sample preparation during the method development phase of a project. This type of […]

Pesticides in Dietary Supplements: Advantages of QuEChERS vs. PAM 303

... Simple, cost-effective QuEChERS approach saves time and uses 20x less . This new QuEChERS-based procedure reduces matrix interferences, as well as sample prep variation among ... Restek has developed the first QuEChERS-based method for determining pesticide residues in dietary ... PAM 303, SPE, cSPE, QuEChERS, pesticides, multiresidue, dietary supplements, sample prep...

Fast Screening of Recalled Tylenol for Tribromoanisole and Related Adulterants Using QuEChERS and GC-TOFMS

... Rapid sample preparation with QuEChERS improves turnaround time for emergency response analysis situations. Prepackaged QuEChERS extraction salts ... benefit from fast QuEChERS-based sample preparation and sensitive, full mass-range GC/TOF-MS. ... Tylenol, recall, GC/TOF-MS, TBA, TBP, QuEChERS, sample prep, dSPE, Rxi-5Sil MS...

Restek Essentials: Featured Chromatography Products 2019.1 (PDF 4834kB)

... selection advice and everything else you need for QuEChERS at www.restek.com/quechers 3 Sample Filtration .restek.com/quechers. QuEChERS Made Even Easier Q-sep QuEChERS Sample Prep Extraction Salts & Tubes Free-flowing salts...

News: New QuEChERS Performance Standards Kit From Restek

Sourcing individual pesticide standards and preparing working standards is expensive and time-consuming. Food safety laboratories can simplify standard preparation and better ensure data quality by using Restek’s new QuEChERS performance standards kit for initial method evaluation and ongoing performance validation. … Continue reading

Restek Essentials: Featured Chromatography Products 2019.2 (PDF 5798kB)

...SPE tubes and other QuEChERS products, visit www.restek.com/quechers QuEChERS Made Even Easier Q-sep QuEChERS -sep QuEChERS Extraction Kit original unbuffered 4 g MgSO4, 1 g NaCl with 50 mL Centrifuge Tube 50...

ChromaBLOGraphy: QuEChERS 3 part series…almost

OK…so only the first two articles are done but I just finished the third article and it will be published in Separation Science in August. This series was interesting to write because I was able to spend time focusing both on QuEChERS fundamentals and exploring the evolution of this approach. The official methods and method [...]

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 GCx in some of the illicit marijuana samples used for method development. QuEChERS Extraction Saves ... challenging due to matrix complexity. The use of QuEChERS, cartridge SPE cleanup, and GCxGC-TOFMS as presented...

ChromaBLOGraphy: Difficult QuEChERS extracts: Removing fatty acid interferences

Using the QuEChERS extraction and cleanup method for high fat commodities such as, nuts, dairy, fish, and avocado can be difficult to analyze for pesticide residues.  Using the dispersive solid phase (dSPE) cleanup sometimes is just not enough to adequately remove the fatty acid co-extractives. Check out this technical article on how to quickly yet […]

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

...   Spinach Conclusion Abstract QuEChERS extraction, d residues were present. We used a QuEChERS-based sample preparation method and gas chromatography ... QuEChERS extraction, dSPE cleanup, and GC-TOFMS analysis were used to assess pesticide residue ... strawberry, "GC-TOFMS", QuEChERS, pesticide, "pesticide residue", spinach, dSPE...

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 [...]

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 are a good starting point for multiresidue pesticide methods. For example, the QuEChERS approach to sample ... The novel approach used here combines QuEChERS extraction, cartridge SPE cleanup, and GCx ... "dietary supplements", "cartridge SPE", GCxGC, GCxGC-TOFMS, Pesticides, QuEChERS, cSPE, GC-TOFMS...

Restek Essentials (PDF 1623kB)

... ciò di cui hai bisogno per la QuEChERS su www.restek.com/it/quechers 3 Filtrazione di campioni UHPLC. Le provette dSPE da 15 mL sono disponibili anche su www.restek.com/it/quechers. QuEChERS...

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

ChromaBLOGraphy: QuEChERS Extraction of Oil Contaminated Seafood – PAHs

“Growing up” as an environmental analytical chemist, I always think of hydrophobic contaminants, like Polycyclic Aromatic Hydrocarbons (or PAHs), needing hydrophobic solvents to isolate/extract them from hydrophobic matrices, like fish or seafood. (Dang, he’s using hydrophobic so much he must be rabid…) In fact, I’d seen reduced recoveries when trying to QuEChERS extract (with polar [...]

Restek Advantage, 2012.1 (PDF 14846kB)

... range for semivolatiles…pp. 8–9 • QuEChERS with LC-MS/MS and GCxGC-TOFMS for comprehensive pesticide Monitoring in Foods Using QuEChERS, LC-MS/MS, and GCxGC-TOFMS. . . . . . . . . 12–13 Increase Data Quality...

ChromaBLOGraphy: QuEChERS with dSPE A-OK at NMISA

QuEChERS is the popular “Quick, Easy, Cheap, Effective, Rugged, and Safe” sample preparation method for pesticides in fruits/vegetables that includes a dispersive solid phase extraction (dSPE) cleanup (shake extract with loose sorbent material, e.g. PSA, C18, GCB; more acronyms!). While in South Africa at ChromSA’s request to do GC training courses I had several slides [...]

Restek Essentials (PDF 1881kB)

... trovare le provette dSPE pronte all’uso e altri prodotti QuEChERS alla pagina www .restek.com/it/quechers QuEChERS ancora più semplici da usare Sali di estrazione e provette per la preparazione dei campioni...

Restek Essentials (PDF 6898kB)

... des kits : consultez www.restek.fr Tubes QuEChERS Q-sep pour purification d'extraits par d SPE également disponibles. Consultez www.restek.fr/quechers Tubes QuEChERS Q-sep : encore plus pratiques Tubes...

Fast, Simple Sample Cleanup Using QuEChERS SPE Tubes

...ugged, and Safe, the QuEChERS (“catchers”) method for extracting pesticides from food and materials versus conventional SPE methods, QuEChERS employs a novel and much quicker dispersive solid phase ... Quick, Easy, Cheap, Effective, Rugged, and Safe, the QuEChERS ("catchers") method for extracting (dSPE). QuEChERS methods are convenient, rugged methods that simplify extract cleanup, reduce ... QuEChERS, dSPE, strawberries, multiresidue, pesticides...

News: Restek QuEChERS SPE Tubes and Biphenyl LC Columns Honored by Laboratory Equipment Magazine

Two Restek product lines were recently honored by Laboratory Equipment magazine. QuEChERS SPE tubes were selected as a winner and Biphenyl LC columns were named as a finalist in the magazine’s 2009 Reader’s Choice Awards competition. Winners were selected by … Continue reading

7.5-Min Screening Analysis of Multiresidue Pesticides in Brown Rice Flour (PDF 1543kB)

...: Multiresidue Pesticide Mix Extracted from Brown Rice Flour Using QuEChERS Extraction and Cleanup • 7.5-min multiresidue pesticide kit, extracted with Q-sep QuEChERS extraction salts, cleaned up using d...

ChromaBLOGraphy: Headless Horseman Invades Restek Lab during QuEChERS Extractions of Beer

Happy Halloween! A recent project looking for PAHs in beer (is nothing sacred?) using a modified QuEChERS extraction and  silica cleanup, followed by analysis with GC using our new Rxi-PAH GC column allowed us to get colleagues Geoff Cozine and Scott Adams in the lab to do some of the work.  Geoff is a Technical […]

ChromaBLOGraphy: Is There Vitamin P in your Dietary Supplement? Use QuEChERS and find out.

My colleagues Jason Thomas, Michelle Misselwitz, Julie Kowalski and I recently developed a QuEChERS extraction approach for pesticides (Vitamin P) in dietary supplements, including dandelion, ginseng, barberry, sage, yellow dock, green tea, and finished products (blends of individual botanicals). We found that dispersive solid phase extraction (dSPE) did not have the capacity to clean up [...]

Growing Analytical Solutions for Cannabis Testing: Innovative Products and Expertise for Fast, Accurate, Reliable Results (PDF 8575kB)

... for accurate, reliable results. Restek’s versatile line of Q-sep QuEChERS extraction and cleanup salts allows either LC or GC, and Restek’s Q-sep QuEChERS products allow for fast, easy, adaptable cleanup of a wide...

ChromaBLOGraphy: QuEChERS Extraction of Seafood — PAHs, Now PCBs and Organochlorine Pesticides

Previous posts on this subject noted good spike recoveries for PAHs at the 10 and 100 ng/g level from seafood, including scallops, shrimp, and oysters. The beauty of QuEChERS is its multiresidue extraction capability, so it was no trouble to report data for PCBs and organochlorine pesticides, in addition to the previously determined PAHs. That’s [...]

ChromaBLOGraphy: QuEChERS Extraction of Seafood — 10 ng/g PAHs in Scallops, Shrimp, and Oysters

Continuing with the previous blog where I QuEChERS extracted 100ng/g PAH spikes of scallops, shrimp, and oysters, and achieved good results, I followed up with 10ng/g spikes under the same method conditions as used before (see June 28 entry). The recoveries for the 10ng/g spike are reported in the table. In general, the results are [...]

News: Q-sep Extraction Salts Make QuEChERS Even Easier

For years, the QuEChERS approach has made sample preparation faster and easier than traditional methods. Now, the new Q-sep extraction salts from Restek make an easy technique even simpler. Restek’s new, improved design provides the salts in a more granular … Continue reading

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 [...]

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

...-intensive modified QuEChERS extraction and silica solid phase extraction (SPE) sample cleanup method was developed permeation chromatography [23-25]. QuEChERS sample preparation methods are a desirable alternative ... QuEChERS extraction and solid phase extraction sample cleanup. Both GC-TOFMS and GC-MS/MS techniques...

Mitigating Matrix Effects: Examination of Dilution, QuEChERS, and Calibration Strategies for LC-MS/MS Analysis of Pesticide Residues in Diverse Food Types

... performed matrix effects studies investigating two approaches for reducing matrix interferences, QuEChERS -liquid extraction, solid phase extraction, and the QuEChERS approach. QuEChERS has extraction and cleanup steps ... the relative effectiveness of sample dilution, QuEChERS cleanup, solvent-based calibration, and matrix...

ChromaBLOGraphy: QuEChERS Acetonitrile Injections Still Problematic for Gas Chromatographers at the European Pesticide Residue Workshop

Acclaimed pesticide residue chemist Richard Fussell from the Food and Environmental Research Agency in the UK gave an excellent talk today at EPRW called “High Sensitivity GC-MS/MS: A Robust Technique for the Direct Analysis of Pesticides in QuEChERS Acetonitrile Extracts”.  One of the main themes of his talk was using more sensitive instrumentation to deal [...]

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 […]

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

...Abstract Food commodities were fortified with pesticides and processed using the QuEChERS varied in water, fat, and pigment content, so the ruggedness of QuEChERS as well as the performance ... and processed using a QuEChERS sample preparation technique. Samples were analyzed by both GCxGC-TOFMS and LC...

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: Screening for Bifenazate (Floramite) in Medical Marijuana Using QuEChERS and GC-FID – Is it Possible?

Bifenazate (CAS# 149877-41-8) is an acaricide made by Uniroyal Chemical and sold under the trade name Floramite.  Floramite is registered in the US for control of mites on a wide variety of plants, and is widely employed in greenhouses and other indoor growing environments.  Its effective control of spider mites leads to its application by [...]

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 [...]

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

Author(s): Jack Cochran, Julie Kowalski, Sharon Lupo, Michelle Misselwitz, and Amanda Rigdon Restek Corporation Published By: Restek Corporation Year of Publication: 2014 Link: http://www.restek.com/Technical-Resources/Technical-Library/Pharmaceutical/fff_FFAR1950-UNV Abstract: As medical cannabis is more frequently prescribed, patient safety must be ensured. Pesticide residue testing is … Continue reading

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

... this plot of a sage QuEChERS extract cleaned with cSPE, the x axis represents the primary column retention to the large number of solvents required. Using the QuEChERS approach, which offers complete seafood sample...

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: Need Help with QuEChERS: #AskRestek Twitter Q&A session

Just wanted to let everyone know we will be hosting a #AskRestek Twitter Q&A session about QuEChERS next week at 3:00 p.m. EST (12:00 noon PST) on Tuesday, May 3. QuEChERS is a great approach for sample preparation with lots of benefits. It is also very flexible which is nice but that can also make […]

ChromaBLOGraphy: QuonFuseD by QuEChERS?

Currently the big push for sample prep is using QuEChERS, which stands for “Quick, Easy, Cheap, Effective, Rugged, and Safe”. It is a much more streamlined method, when compared to traditional liquid/liquid extractions and even SPE. Pesticide residues in various matrices are often analyzed by QuEChERS methodology, and today it is probably the most often [...]

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

Author(s): Julie Kowalski, Jack Cochran Published By: Restek Corporation Year of Publication: 2011 Link: http://www.restek.com/Technical-Resources/Technical-Library/Foods-Flavors-Fragrances/fff_an1321 Abstract: QuEChERS extraction, dSPE cleanup, and GC-TOFMS analysis were used to assess pesticide residue levels in strawberry and spinach from both commercial and Amish growers. … Continue reading

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

Author(s): Julie Kowalski, Amanda Rigdon, and Jack Cochran Restek Corporation Published By: Restek Corporation Year of Publication: 2015 Link: http://www.restek.com/Technical-Resources/Technical-Library/Foods-Flavors-Fragrances/fff_FFAN2086-UNV Abstract: This application note describes the development of an analytical method for PAHs in tea that allows analysts to more quickly and accurately … Continue reading

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 [...]

News: Reference Module in Chemistry, Molecular Sciences and Chemical Engineering: QuEChERS

Authors: Alexandria M. Pavkovich, David S. Bell Restek Corporation Published By: ScienceDirect Year of Publication:  June 2018 Link: https://www.sciencedirect.com/science/article/pii/B9780124095472139721#! Abstract: QuEChERS has become a widely accepted and highly adaptable method for pesticide residue analysis. The analytical scope and applicability of QuEChERS are expanding … Continue reading

ChromaBLOGraphy: Are fatty acids overwhelming your QuEChERS dSPE PSA cleanup and causing issues in your GC analysis? Get more cleanup capacity with cartridge SPE cleanup!

Fatty acids are important molecules in the human body because they are used as a source of fuel.  There are many food sources of both “healthy” and “unhealthy” fatty acids.  Many sources of dietary fatty acids come from fruits, vegetables, seeds, nuts, and animal fats.  The QuEChERS methodology was developed to analyze pesticides in fruits […]

ChromaBLOGraphy: Restek Colleagues and QuEChERS at the Florida Pesticide Residue Workshop

Jonathan Keim, Michelle Misselwitz, and Julie Kowalski manning the Restek booth at the 47th Florida Pesticide Residue Workshop and showing off the new Restek Q-sep QuEChERS extraction salts packets.

News: Mitigating Matrix Effects: Examination of Dilution, QuEChERS, and Calibration Strategies for LC-MS/MS Analysis of Pesticide Residues in Diverse Food Types

Author(s): Julie Kowalski, Sharon Lupo, and Jack Cochran Restek Corporation Published By: Restek Corporation Year of Publication: 2013 Link: http://www.restek.com/Technical-Resources/Technical-Library/Foods-Flavors-Fragrances/fff_FFAN1796-UNV Abstract: Liquid chromatography tandem mass spectrometry (LC-MS/MS) is popular for monitoring pesticide residues in food. The increased selectivity and sensitivity of … Continue reading

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

Restek Reference Standards (PDF 4407kB)

... solvents • Pesticides • Fatty acid methyl esters (FAMEs) • QuEChERS • Derivatization reagents...

ChromaBLOGraphy: Tylenol Recall and the QuEChERS Approach to 2,4,6-Tribromoanisole Determination

Recently a voluntary recall of Tylenol occurred due to tribromoanisole contamination from tribromophenol fungicide/wood preservative on wooden pallets that held packaging material. When contaminations of pharmaceuticals occur, public safety is at risk and fast sample preparation and analysis helps identify offending chemicals. Jason Thomas and I QuEChERS extracted ground Tylenol caplets (water wetted) that had [...]

ChromaBLOGraphy: Michelle Misselwitz Does Dietary Supplements at Florida Pesticide Residue Workshop

No, I’m not revealing any of Michelle’s personal habits here. But I do want to say what a great job she did talking about QuEChERS, cartridge SPE, and GCxGC-TOFMS for the analysis of pesticides in dietary supplements at the Restek vendor seminar at FPRW last night (Sunday). Her talk was visually stimulating, great graphics, and [...]

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

Author(s): Jack Cochran, Jason Thomas, Julie Kowalski, Michelle Misselwitz, Rick Lake Published By: Restek Corporation Year of Publication: 2012 Link: http://www.restek.com/Technical-Resources/Technical-Library/Foods-Flavors-Fragrances/GN_AN1338 Abstract: The novel approach used here combines QuEChERS extraction, cartridge SPE cleanup, and GCxGC-TOFMS analysis, resulting in good recoveries for a … Continue reading

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: QuECh me and Restek at PittCon in Chicago!

I’m just walking out the door to head to Chicago and PittCon 2009. Given these economic times, I’m not sure what to expect out of the meeting this year, but Restek will be there ready to help with your applications, including QuEChERS, the popular Quick, Easy, Cheap, Effective, Rugged, and Safe sample preparation method. In [...]

ChromaBLOGraphy: Thiabendazole – Planar Pesticide Loss to Graphitized Carbon Black during Dispersive Solid Phase Extraction Cleanup for QuEChERS

 Anyone who has done QuEChERS for pesticide residue sample preparation knows that a critical part of the approach is the novel dispersive solid phase extraction (dSPE) cleanup, whereby the extract is simply shaken with loose sorbent material to remove matrix interferences and then centrifuged.  An aliquot of the cleaned extract is then removed for analysis [...]

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

... and paprika were extracted using QuEChERS methodology. - dSPE cleanup was performed on oyster extracts...

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: Conferee Networking Session on Food Analysis at PittCon

Today Neil Mosesman and I participated in the PittCon 2010 networking session, Contemporary Food and Environmental Analysis, facilitated by John Mathis of Global Laboratory Services, Inc. John adroitly introduced the topic via slides and then led discussion on challenges faced by analytical chemists, including multiresidue sample preparation methods (e.g. QuEChERS), target/unknown compound instrumental approaches, benefits [...]

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: The Impact of a Dirty Marijuana Extract on Pesticide Recoveries from a Splitless GC Inlet

In a previous post I told you about our experimentation with marijuana (that didn’t sound right…) and pesticide extraction via QuEChERS.  An important part of that work was cartridge solid phase extraction (cSPE) cleanup with 500mg CarboPrep 90 / 500 mg PSA cartridges.  To minimize losses of planar pesticides (e.g hexachlorobenzene), which we know can [...]

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: Split Injection Makes for Easier Polar Solvent GC Work versus Splitless Injection

As anyone who’s doing QuEChERS knows, analyzing acetonitrile extracts on nonpolar GC columns (like Rxi-5ms, e.g.) using splitless injection can be problematic because of the classic solvent – stationary phase mismatch.  To avoid split peaks we usually have an initial GC oven temperature slightly above the 82°C boiling point of acetonitrile (MeCN), but this causes tailing […]

ChromaBLOGraphy: The Most Useful Pesticide Standard Ever…monitoring GC inlet “dirtiness”

I have spent most of my time over the past several years testing pesticides and there is one standard that I simply can’t live without…QuEChERS Performance Standards Kit. It is based on a really interesting article* on analyte protectants with a few compounds added. The standard has 40 compounds housed in three vials for long […]

ChromaBLOGraphy: FPRW Poster on Oil-Contaminated Seafood Now Available

Hi Everyone: I’ve had several requests for my 2010 Florida Pesticide Residue Workshop poster, The QuEChERS Approach with GC-TOFMS and GCxGC-TOFMS for PAHs in Oil Contaminated Seafood, so I am going to post it here:  FPRW P-39 PAHs Seafood Cochran In summary, it represents preliminary attempts to adapt the QuEChERS extraction and cleanup approach to relatively [...]

ChromaBLOGraphy: Pesticide analysis for cannabis flower: method and data overview

Pesticides in cannabis has been a hot topic lately and we have been getting many requests for help with this analysis. We did work on pesticide residue testing in cannabis about 6 years ago. At that time, we were limited to testing our methods with a small amount of seized material. Recently, we have been […]

News: Attend Restek’s SS AOAC Luncheon Workshop

This year at SS AOAC, in addition to being a proud sponsor, Restek is offering a luncheon workshop on method development and improvement using our free and easy EZGC® online tools. If you are planning to attend SS AOAC, we … Continue reading

ChromaBLOGraphy: Brownies anyone?

I’ve gotten a couple of interesting customer questions regarding the extraction of drugs from food matrices. Mostly I deal with ordinary matrices like blood and urine, so I’ve enjoyed the challenge of recommending an extraction method for a new matrix. Recently, a method known as QuEChERS became popular in the food safety industry for the [...]

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

... pesticide residues remain on the final product. We used the Quick–Easy–Cheap–Effective–Rugged–Safe (QuEChERS the cleanup efficacy and pesticide recoveries for different formulations of QuEChERS dispersive solid phase ... We compared the efficacy of dSPE and cSPE cleanup methods for multiresidue pesticide analysis of QuEChERS...

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: Tylenol back in the news with product quality problems and recalls

It seems like no sooner had I written my blog on melamine raising its ugly head again in Chinese dairy products, the news came through that Tylenol was being recalled (the eighth time in a year) for possible metal particles, chemical, and bacterial contaminations.  ABC News has information posted on the subject. http://abcnews.go.com/WN/tylenol-maker-johnson-johnson-announces-eighth-product-recall/story?id=11129247 For information on [...]

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: Analysis of Pesticides in Dietary Supplements: Evaluation of QuEChERS, Cartridge SPE Clean-Up, and Gas Chromatography Time-of-Flight Mass Spectrometry

Author(s): Julie Kowalski, Michelle Misselwitz, Jason Thomas, Jack Cochran Published By: Agro FOOD INDUSTRY Hi-tech today Issue: Sept./Oct. Focus on Food Analysis supplement, vol. 22, no. 5 Year of Publication: 2011 Link: http://agro-food-industry.teknoscienze.com/testata.asp?id_testata=244&folder=supplements Abstract: New requirements for dietary supplements to … Continue reading

Growing Analytical Solutions For Cannabis Testing Innovative Products And Expertise For Fast, Accurate, Reliable Results

... of interest is also crucial for a successful pesticide analysis using either LC or GC, and Restek’s Q-sep QuEChERS...

News: Developing New Methods for Pesticides in Dietary Supplements

Author(s): Julie Kowalski, Michelle Misselwitz, Jason Thomas,  Jack Cochran Published By: Food Safety Magazine Issue: February/March 2012 Year of Publication: 2012 Link: http://www.foodsafetymagazine.com/article.asp?id=3876&sub=sub1 Abstract: New requirements for dietary supplements to be manufactured under current Good Manufacturing Practices (cGMP) regulations have created a … Continue reading

ChromaBLOGraphy: Fast gas chromatographic residue analysis in animal feed using split injection and atmospheric pressure chemical ionization tandem mass spectrometry

In a recent ChromaBLOGraphy post I mentioned that we are doing a campaign on “shoot-and-dilute GC”, also known as split injection GC, at RAFA 2015. A paper just published by Tienstra, Portolés, Hernández, and Mol used split injection with APGC for pesticide and other residue analysis in animal feed to achieve many of the benefits we’ve been […]

ChromaBLOGraphy: Read This Before You Go to PittCon 2010 in Orlando!

The title is akin to “Free Beer” to get you to click in, but I invite my colleagues to visit me and Restek at PittCon. Due to space limitations, I only tout my presentations here (yeah right Jack, it’s because of space limitations…). I’m heavily invested in QuEChERS. Poster 660-2 P, Mon, comparing GPC to [...]

ChromaBLOGraphy: Restek at the Florida Pesticide Residue Workshop Starting July 18

  Join me and my colleagues Michelle Misselwitz, Julie Kowalski, and Jonathan Keim at the Florida Pesticide Residue Workshop next week for some fun science.  In addition to the offerings below, we’ll also be handing out some sweet treats (hint: one of my co-workers has the same initials) at our exhibition booth.  Restek Seminar   Sunday, July 18, [...]

News: Krone Advances to State Science Fair

Restek is pleased to congratulate Liesl Krone, an 8th grader at Acton Middle School in Granbury Texas, whose science fair project recently advanced to state-level competition. Her project entitled “What Pesticides Have You Eaten Today” will be presented at the … Continue reading

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: What dSPE works with spinach in GC-MS/MS analysis? #NationalSpinachDay

Today is a National Spinach Day! What is a better way to celebrate than to talk about spinach analysis? During part 1 of my blog series, I discussed what dSPE was best for celery. I found that most dSPE, with the exception of dSPE containing high amounts of graphitized carbon black (GBC), showed acceptable analyte recovery […]

News: New EU 15+1 PAH Standard Offers High Stability and Dilution Flexibility

Restek is pleased to announce the release of a new EU 15+1 PAH reference standard for the analysis of PAHs in food and environmental samples. Formulated to contain the 16 major European Food Safety Authority (EFSA) PAH compounds, this new … Continue reading

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 [...]

ChromaBLOGraphy: Fast Sample Preparation and Shoot-and-Dilute GC for Flame Retardants in Fish

The shoot-and-dilute GC technique (split injection) is perfectly matched for the fast sample preparation approach of QuEChERS.  The QuEChERS concept provides a fast, multi-residue extraction and “just enough” cleanup.  The technique is quick and minimizes solvent usage, but the resulting extract can contain a large amount of coextracted nonvolatile material.  A split injection is an […]

News: Comparison of extraction techniques for polycyclic aromatic hydrocarbons from lichen biomonitors

Author(s): Leandri Van der Wat and Patricia B. C. Forbes Department of Chemistry, University of Pretoria, Hatfield, South Africa Published By: Environmental Science and Pollution Research Issue: 26 Year of Publication: 2019 Link: https://link.springer.com/article/10.1007%2Fs11356-019-04587-3 Abstract: Lichens are useful biomonitors for atmospheric … 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: Creepy Crawly Bedbugs Back in the News Again – Pesticide Resistance

I was watching ABC News yesterday and one of the stories reported was on bedbugs evolving to resist pesticides through toxin breakdown mechanisms via enzymes.  This Ohio State University study supplements earlier findings that genetic changes in bedbugs allow them to protect their nerve cells from pesticides. As Louis Sorkin, an entomologist from the American [...]

News: Restek’s New EFSA PAH4 Standard Offers Low-Volatility Accuracy and High-Concentration Versatility

The formulations chemists at Restek have developed a new certified reference material (CRM) of four PAHs—benz[a]anthracene, benzo[a]pyrene, benzo[b]fluoranthene, and chrysene—designed for greater convenience, longer shelf life, and increased long-term accuracy. Its high 1,000 µg/mL concentration gives analysts the freedom to … Continue reading

ChromaBLOGraphy: LAPRW & Montevideo are both awesome

Jonathan Keim has posted this report from South America. Makes me want to go brew up some yerba mate myself, but it just won’t be the same… Thanks, Jonathan! First and most important, Montevideo is a beautiful city. We have enjoyed walking through the old city, which is right next to the hotel and conference [...]

News: Mitigate Matrix Interference With New Isotopically Labeled Pesticide Residue Internal Standards From Restek

Any food safety chemist can attest that interference is a major concern when performing pesticide residue analysis. But with the release of its expanded line of internal and surrogate reference standards, Restek now offers enough options to mitigate interference in … Continue reading

News: Accurately Detect and Quantify 204 Pesticides of Global Food Safety Concern by LC-MS/MS

Stop spending your time and money developing LC-MS/MS multi-residue pesticide methods and mixing reference standards when you could be running samples! Restek’s trusted food safety experts have already done the work for you—with guaranteed accuracy and at a lower cost. … Continue reading

News: Fortify or Calibrate for 203 Pesticides by GC-MS/MS With This Single Restek® CRM Kit

GC-MS/MS is the technique of choice for analyzing pesticide residues in many fruits, vegetables, botanicals, and herbals like tea, ginseng, ginger, Echinacea, and dietary supplements. And Restek’s new GC-MS/MS pesticide reference standards kit contains over two hundred compounds pulled from … Continue reading

ChromaBLOGraphy: Medical Marijuana Musings

At Restek, we’re into medical marijuana, from an analytical standpoint, as cannabis is one of the most complex (and controversial) natural products.  That complexity can make it very challenging to analyze, especially as the suite of analytes expands beyond the usual cannabinoids (e.g. delta-9-THC, cannabidiol, cannabinol) to include other cannabinoids (e.g. cannabigerol, cannabichromene, delta-8-THC, cannabivarin, etc.) and [...]

Frequently Asked Questions: Sample Preparation

Frequently Asked Questions: Sample Preparation FAQ

ChromaBLOGraphy: EPRW: European Pesticides Residue Workshop in Sunny Cyprus

                                    Just wanted to let everyone know that we have published our presentations we presented at EPRW (European Pesticide Residue Workshop) last month in Limassol, Cyprus. It was a great meeting in a beautiful location. It was a pleasure to […]

News: Cochran to Present at International Symposia on Recent Developments in Pesticide and POPs Analysis

Restek’s Jack Cochran will be a featured speaker at both the 1st International Symposium on Recent Developments in Pesticide Analysis and the 10th International Symposium on Recent Developments in POPs Analysis. Both symposia are free, two-day events organized by Thermo … Continue reading

News: Michelle Misselwitz to Present at BFR 2015 in Beijing

The 7th International Symposium on Brominated Flame Retardants (BFR 2015) will be held April 21–24, 2015 in Beijing. Michelle Misselwitz, a leader in BFR work at Restek, will attend and present her most recent work on improving the analysis of … Continue reading

ChromaBLOGraphy: 7th International Symposium on Recent Advances in Food Analysis (RAFA)

The 7th International Symposium on Recent Advances in Food Analysis, better known in short as RAFA, starts this week in Prague, The Czech Republic.  This is my tenth anniversary for this biennial meeting, where the organizer, Jana Hajšlová, invited me to give the lecture, Using the QuEChERS Sample Preparation Method and GCxGC-TOFMS to Determine Pesticides […]

ChromaBLOGraphy: Large Volume Splitless Injection for EPA Method 8270 Semivolatiles without a PTV and without a Press-Fit Connector for the Retention Gap

Regular readers (and maybe irregular readers, too) may remember several blogs I’ve posted on Concurrent Solvent Recondensation Large Volume Splitless Injection (CSR-LVSI) with an off-the-shelf split/splitless injector on an Agilent gas chromatograph.  Michelle Misselwitz and I recently made a major discovery on this work, confirming that gas chromatographers can make large volume splitless injections up [...]

ChromaBLOGraphy: Choosing the right dispersive SPE for GC-MS/MS analysis of celery

I’ve recently started experimenting with QuEChERS extractions for pesticide analysis. The available options are overwhelming, especially when it comes to dispersive solid phase extraction (dSPE) for the cleanup. For starters, I’ve been looking at the smaller volume dSPE (2 mL, summarized in Table 1), because I didn’t want to waste the raw material, solvents and […]

News: Attend Restek’s Vendor Seminar on GC-MS/MS Performance at RAFA 2015

In addition to exhibiting, Restek will hold a vendor seminar at the 7th International Symposium on Recent Advances in Food Analysis (RAFA). Presented by Restek’s own Julie Kowalski on November 5 at 1:30 p.m., this valuable seminar will explore prolonging … Continue reading

ChromaBLOGraphy: Another cup of PAH tea please!

It seemed not too long ago that Julie Kowalski and I were analyzing tea, a lot of tea, and only tea.  To this day we cringe at the thought of tea, but hopefully our pain can be your gain. We analyzed pesticides, natural products, and polycyclic aromatic hydrocarbons (PAHs) in tea.   Julie and Amanda Rigdon […]

ChromaBLOGraphy: 7th International Symposium on Recent Advances in POPs Analysis

As mentioned in a previous blog, I was able to attend the 7th International POPs Symposium sponsored by Thermo Scientific at the Auditorium Santa Margherita in Venice, Italy and present work done on GC-HRMS analysis of chlorinated dioxins and furans on the Rtx-Dioxin2.  The symposium was a veritable Who’s Who of noted scientists in POPs [...]

ChromaBLOGraphy: The Bard Hits the Bong?

I was listening to “Wait Wait… Don’t Tell Me!”  (WWDTM) today on the local NPR station and heard an interesting story.  WWDTM is a humorous quiz show on topical news items, and features celebrities and comedians bantering with each other and the host, Peter Sagal, while chosen listeners are called and asked questions.  The prize [...]

ChromaBLOGraphy: The Solvent Effect in Concurrent Solvent Recondensation Large Volume Splitless Injection with Methylene Chloride – EPA Method 8270 Semivolatiles

Michelle Misselwitz and I are again exploring large volume splitless injection with an off-the-shelf, unmodified Agilent splitless injector, continuing the work we recently presented at Dioxin 2010 and in some seminars in Canada during January.  We often get asked from environmental chemists if this technique will work with methylene chloride solvent, specifically for EPA Method 8270, [...]

ChromaBLOGraphy: Inject more fish extracts before GC maintenance is needed using shoot-and-dilute GC

Persistent organic pollutants (POPs) like dioxins, furans, polychlorinated biphenyls (PCBs), and polybrominated diphenyl ether (PBDEs) are lipophilic and therefore may be found in fatty matrices like fish.  In order to remove the high lipid coextractives, lengthy cleanup procedures that require multiple cleanup cartridges are often used.  I recently presented work at the Dioxin meeting where […]

ChromaBLOGraphy: A Hoppy Little Story

Now that we’re getting into the warmer months of the year, you’re probably starting to see pop-up beer gardens or people outside relaxing with a nice cold one. Since the beer industry has been evolving and people are enjoying craft beers more and more, there are tons of unique brews on the market. If you […]

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: Let me help you schedule your technical journey at Pittcon 2011 this year.

Nearly 20,000 people attend Pittcon from over 90 countries and there is a staggering amount to see on the technical front. Luckily the show has the presentation titles on-line and easily searched in the PDF format. Simply enter in your search term and quickly find your area of interest. Below is an excel sheet that will [...]

ChromaBLOGraphy: Determination of Chloropropanols in Soy Sauce: Part 1, Enter The Matrix

A while back I was doing some reading and came across an application of GC-MS in food safety that caught my attention. The analysis of food products, specifically soy sauce, for contamination with chloropropanols. So how do chlorinated alcohols end up in food? During the production of a food ingredient known as  hydrolyzed vegetable protein (HVP) various vegetable protein feedstocks […]

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: LVI-SV with MMI Inlet Using a Restek Premium 2.0 mm Single Taper Liner w/ Wool

Agilent’s Multimode (MMI) Inlet can be used as a PTV (programmable temperature vaporization) type inlet for large volume injections, with the advantage of using standard sized split/splitless liners.  This technique requires careful optimization of a number of parameters, which starts by choosing a proper inlet liner.  I recommend trying a Restek Premium 2.0 mm Single Taper […]

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

News: Restek Chromatographers Share Their Insights at COLACRO XIV

Beautiful Florianópolis in Santa Catarina, Brazil, was the site of this year’s Congresso Latino Americano de Cromatografia e Técnicas Relacionadas (COLACRO). Perhaps the most influential meeting on chromatography in South America, this biannual event was originally scheduled to be in … Continue reading

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Residual Pesticides in Botanicals by GC-MS/MS

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