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GC Multiresidue Pesticide Standard #9 (8 components)

Organophosphorus Compounds

... composition; detailed support documentation provided. Optimized multiresidue pesticide method complete supplier for world-class GC-MS/MS multiresidue pesticide analysis: reference and internal ... GC Multiresidue Pesticide Standard #9 ... Ampul 9 of 9 in the GC-MS/MS Multiresidue Pesticide Standard Kit...

LC Multiresidue Pesticide Standard #8 (Hydramethylnon)

Organonitrogen Compounds

... tested to confirm composition; detailed support documentation provided. Optimized multiresidue is your complete supplier for world-class LC-MS/MS multiresidue pesticide analysis: reference and internal ... LC Multiresidue Pesticide Standard #8 ... Ampul 8 of 10 in the LC-MS/MS Multiresidue Pesticide Standard Kit...

LC Multiresidue Pesticide Standard #10 (Carbendazim)

Carbamate/Uron Compounds

... tested to confirm composition; detailed support documentation provided. Optimized multiresidue is your complete supplier for world-class LC-MS/MS multiresidue pesticide analysis: reference and internal ... LC Multiresidue Pesticide Standard #10 ... Ampul 10 of 10 in the LC-MS/MS Multiresidue Pesticide Standard Kit...

GC Multiresidue Pesticide Standard #1 (16 components)

Organophosphorus Compounds

... composition; detailed support documentation provided. Optimized multiresidue pesticide method complete supplier for world-class GC-MS/MS multiresidue pesticide analysis: reference and internal ... GC Multiresidue Pesticide Standard #1 ... Ampul 1 of 9 in the GC-MS/MS Multiresidue Pesticide Standard Kit...

GC Multiresidue Pesticide Standard #3 (25 components)

Organonitrogen Compounds

... composition; detailed support documentation provided. Optimized multiresidue pesticide method complete supplier for world-class GC-MS/MS multiresidue pesticide analysis: reference and internal ... GC Multiresidue Pesticide Standard #3 ... Ampul 3 of 9 in the GC-MS/MS Multiresidue Pesticide Standard Kit...

GC Multiresidue Pesticide Standard #4 (28 components)

Organonitrogen Compounds

... composition; detailed support documentation provided. Optimized multiresidue pesticide method complete supplier for world-class GC-MS/MS multiresidue pesticide analysis: reference and internal ... GC Multiresidue Pesticide Standard #4 ... Ampul 4 of 9 in the GC-MS/MS Multiresidue Pesticide Standard Kit...

GC Multiresidue Pesticide Standard #5 (34 components)

Organonitrogen Compounds

... composition; detailed support documentation provided. Optimized multiresidue pesticide method complete supplier for world-class GC-MS/MS multiresidue pesticide analysis: reference and internal ... GC Multiresidue Pesticide Standard #5 ... Ampul 5 of 9 in the GC-MS/MS Multiresidue Pesticide Standard Kit...

GC Multiresidue Pesticide Standard #6 (18 components)

Synthetic Pyrethroid Compounds

... composition; detailed support documentation provided. Optimized multiresidue pesticide method complete supplier for world-class GC-MS/MS multiresidue pesticide analysis: reference and internal ... GC Multiresidue Pesticide Standard #6 ... Ampul 6 of 9 in the GC-MS/MS Multiresidue Pesticide Standard Kit...

GC Multiresidue Pesticide Standard #7 (10 components)

Herbicide Methyl Esters

... composition; detailed support documentation provided. Optimized multiresidue pesticide method complete supplier for world-class GC-MS/MS multiresidue pesticide analysis: reference and internal ... GC Multiresidue Pesticide Standard #7 ... Ampul 7 of 9 in the GC-MS/MS Multiresidue Pesticide Standard Kit...

GC Multiresidue Pesticide Standard #8 (24 components)

Organophosphorus Compounds

... composition; detailed support documentation provided. Optimized multiresidue pesticide method complete supplier for world-class GC-MS/MS multiresidue pesticide analysis: reference and internal ... GC Multiresidue Pesticide Standard #8 ... Ampul 8 of 9 in the GC-MS/MS Multiresidue Pesticide Standard Kit...

LC Multiresidue Pesticide Standard #7 (7 components)

Organonitrogen Compounds

... tested to confirm composition; detailed support documentation provided. Optimized multiresidue is your complete supplier for world-class LC-MS/MS multiresidue pesticide analysis: reference and internal ... LC Multiresidue Pesticide Standard #7 ... Ampul 7 of 10 in the LC-MS/MS Multiresidue Pesticide Standard Kit...

LC Multiresidue Pesticide Standard #9 (7 components)

Carbamate/Uron Compounds

... tested to confirm composition; detailed support documentation provided. Optimized multiresidue is your complete supplier for world-class LC-MS/MS multiresidue pesticide analysis: reference and internal ... LC Multiresidue Pesticide Standard #9 ... Ampul 9 of 10 in the LC-MS/MS Multiresidue Pesticide Standard Kit...

LC Multiresidue Pesticide Standard #1 (13 components)

Organophosphorus Compounds

... tested to confirm composition; detailed support documentation provided. Optimized multiresidue is your complete supplier for world-class LC-MS/MS multiresidue pesticide analysis: reference and internal ... LC Multiresidue Pesticide Standard #1 ... Ampul 1 of 10 in the LC-MS/MS Multiresidue Pesticide Standard Kit...

LC Multiresidue Pesticide Standard #2 (16 components)

Carbamate/Uron Compounds

... tested to confirm composition; detailed support documentation provided. Optimized multiresidue is your complete supplier for world-class LC-MS/MS multiresidue pesticide analysis: reference and internal ... LC Multiresidue Pesticide Standard #2 ... Ampul 2 of 10 in the LC-MS/MS Multiresidue Pesticide Standard Kit...

LC Multiresidue Pesticide Standard #5 (30 components)

Organonitrogen Compounds

... tested to confirm composition; detailed support documentation provided. Optimized multiresidue is your complete supplier for world-class LC-MS/MS multiresidue pesticide analysis: reference and internal ... LC Multiresidue Pesticide Standard #5 ... Ampul 5 of 10 in the LC-MS/MS Multiresidue Pesticide Standard Kit...

LC Multiresidue Pesticide Standard #6 (28 components)

Organonitrogen Compounds

... tested to confirm composition; detailed support documentation provided. Optimized multiresidue is your complete supplier for world-class LC-MS/MS multiresidue pesticide analysis: reference and internal ... LC Multiresidue Pesticide Standard #6 ... Ampul 6 of 10 in the LC-MS/MS Multiresidue Pesticide Standard Kit...

GC Multiresidue Pesticide Standard #2 (40 components)

Organochlorine Compounds

... composition; detailed support documentation provided. Optimized multiresidue pesticide method complete supplier for world-class GC-MS/MS multiresidue pesticide analysis: reference and internal ... GC Multiresidue Pesticide Standard #2 ... Ampul 2 of 9 in the GC-MS/MS Multiresidue Pesticide Standard Kit...

GC Multiresidue Pesticide Kit

...Cat.# 32563: GC Multiresidue Pesticide Standard #1 (16 components -03-8)Cat.# 32564: GC Multiresidue Pesticide Standard #2 (40 components)Organochlorine ... GC Multiresidue Pesticide Kit ... tested to confirm composition; detailed support documentation provided. Optimized multiresidue for world-class GC-MS/MS multiresidue pesticide analysis: reference and internal...

LC Multiresidue Pesticide Standard #3 (38 components)

Carbamate/Uron Compounds

... tested to confirm composition; detailed support documentation provided. Optimized multiresidue is your complete supplier for world-class LC-MS/MS multiresidue pesticide analysis: reference and internal ... LC Multiresidue Pesticide Standard #3 ... Ampul 3 of 10 in the LC-MS/MS Multiresidue Pesticide Standard Kit...

LC Multiresidue Pesticide Standard #4 (63 components)

Organonitrogen Compounds

... tested to confirm composition; detailed support documentation provided. Optimized multiresidue is your complete supplier for world-class LC-MS/MS multiresidue pesticide analysis: reference and internal ... LC Multiresidue Pesticide Standard #4 ... Ampul 4 of 10 in the LC-MS/MS Multiresidue Pesticide Standard Kit...

LC Multiresidue Pesticide Kit

...Cat.# 31972: LC Multiresidue Pesticide Standard #1 (13 components (Vamidoate) (2275-23-2)Cat.# 31973: LC Multiresidue Pesticide Standard #2 (16 components ... LC Multiresidue Pesticide Kit ... tested to confirm composition; detailed support documentation provided. Optimized multiresidue for world-class LC-MS/MS multiresidue pesticide analysis: reference and internal...

Q-sep QuEChERS dSPE Tubes for Extract Cleanup

Fast, Simple Sample Prep for Multiresidue Pesticide Analysis

... original unbuffered, AOAC (2007.01), European (EN 15662), and mini-multiresidue QuEChERS methods. ...

Pesticide Residue Cleanup SPE Cartridges

... in multiresidue pesticide analysis to remove matrix interferences. Excellent for cleanup of dietary...

CarboPrep Reversing SPE Cartridges

....; Guerriero, E.; and Saperi, R. "Development of a Multiresidue Method for Analyzing Pesticide Traces in Water...

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

...EChERS standards for even greater lab efficiency. Standards are compatible with all major methods, including mini-multiresidue...

QuEChERS Quality Control Standards for GC-MS Analysis

...EChERS standards for even greater lab efficiency. Standards are compatible with all major methods, including mini-multiresidue...

QuEChERS Single-Component Reference Standards

...EChERS standards for even greater lab efficiency. Standards are compatible with all major methods, including mini-multiresidue...

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

...EChERS standards for even greater lab efficiency. Standards are compatible with all major methods, including mini-multiresidue...

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

...EChERS standards for even greater lab efficiency. Standards are compatible with all major methods, including mini-multiresidue...

Accurately Quantify 380 Pesticides Using LC-MS/MS and GC-MS/MS (PDF 6072kB)

...Accurately Quantify 380 Pesticides Using LC-MS/MS and GC-MS/MS with Restek’s Multiresidue support documentation provided. ■ Optimized multiresidue pesticide method is offered free of charge...

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

...EChERS sample cleanup using a multiresidue analysis of pesticides on strawberries. Experimental Strawberry J. Schenck. “Fast and Easy Multiresidue Method Employing Acetonitrile Extraction ... sample prep, sample preparation, QuEChERS, dSPE, multiresidue, pesticides, Q-Sep...

Fast, Simple Sample Cleanup Using QuEChERS SPE Tubes

... sample throughput. Here we demonstrate the effectiveness of QuEChERS sample cleanup using a multiresidue . Table I  Modified mini-multiresidue QuEChERS for pesticides from strawberries ... cleanup using a multiresidue analysis of pesticides on strawberries. ... QuEChERS, dSPE, strawberries, multiresidue, pesticides...

7.5-Min Screening Analysis of Multiresidue Pesticides in Brown Rice Flour (PDF 1504kB)

...www.restek.com 7.5-Min Screening Analysis of Multiresidue Pesticides in Brown Rice Flour Featured Application: Multiresidue Pesticide Mix Extracted from Brown Rice Flour Using QuEChERS Extraction...

Comprehensive Pesticide Residue Analysis by LC-MS/MS Using an Ultra Aqueous C18 Column

... complete multi-residue analysis of pesticides in food matrices, including difficult polar or thermally ... Pesticides, ultra aqueous c18, pesticide residue, LC/MS/MS, multiresidue...

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

...dietary supplements, quechers, cSPE, GMP, PAM 303, pesticides, multiresidue, sample prep...

LC and GC Multiresidue Kits

Restek's new LC-MS/MS and GC-MS/MS multiresidue pesticide standards kits include comprehensive lists of pesticides of global concern that are frequently analyzed on a wide range of frui...

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

..., Fast and easy multiresidue method employing acetonitrile extraction/partitioning and “dispersive solid EChERS—A Mini-Multiresidue Method for the Analysis of Pesticide Residues in Low-Fat Products, http...

Growing Analytical Solutions for Cannabis Testing: Innovative Products and Expertise for Fast, Accurate, Reliable Results (PDF 8494kB)

...) provide the selectivity needed for accurate and reliable multiresidue pesticides analysis. Removing , adaptable cleanup of a wide variety of matrices. Ensure Product Safety with Fast, Selective Multiresidue...

Raptor ARC-18 LC Columns Brochure (PDF 4942kB)

....# 9314A12); Dimensions: 100 mm x 2.1 mm ID; Particle Size: 2.7 μm; Temp.: 50 °C; Sample: LC multiresidue ); Dimensions: 100 mm x 2.1 mm ID; Particle Size: 2.7 μm; Temp.: 50 °C; Sample: LC multiresidue pesticide...

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

...PAM 303, SPE, cSPE, QuEChERS, pesticides, multiresidue, dietary supplements, sample prep...

Featured Application: Multiresidue Pesticide Mix Extracted from Brown Rice Flour Using QuEChERS Extraction and Cleanup 7.5-Min Screening Analysis of Multiresidue Pesticides in Brown Rice Flour

... and modern UHPLC instruments. Analysis of multiresidue pesticides rice flour was fortified with all of the components included in the Restek LC multiresidue pesticide ... Multiresidue pesticides analysis presents many challenges, from extensive lists of chemically...

Matrix Effects in Multi-Residue Pesticide Analysis When Using Liquid Chromatography-Tandem Mass Spectrometry

.... It is necessary to monitor various pesticide residues in foods via multi-residue analysis procedures, because of LC/MS/MS multi-residue methods in laboratories worldwide to do consistent, targeted quantitative ... Matrix effects present a significant challenge to multi-residue pesticide analysis of food samples...

Residual Pesticides Analysis of Botanical Ingredients Using Gas Chromatography Triple Quadrupole Mass Spectrometry (PDF 2566kB)

... obtained from Restek: • GC Multiresidue Pesticide Kit (cat.# 32562) • QuEChERS Internal Standard Mix , 0.25 mm ID (cat.# 10029) with SilTite μ-Union connector kit (cat.# 23885) Sample GC Multiresidue...

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

...Evaluation of Dispersive and Cartridge Solid Phase Extraction (SPE) Cleanups for Multiresidue , and Safe) methodology was developed for the determination of multiresidue pesticides in fruits...

News: 7.5-Min Screening Analysis of Multiresidue Pesticides in Brown Rice Flour

Published By: Restek Corporation Year of Publication: 2018 Link: http://www.restek.com/Technical-Resources/Technical-Library/Foods-Flavors-Fragrances/fff_FFSS2930-UNV Abstract: Multiresidue pesticides analysis presents many challenges, from extensive lists of chemically diverse analytes to the negative effects of complex matrix components. The optimized chromatographic method described here allows the analysis of hundreds … Continue reading

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

..., and tedious concentration steps similar to the Soxhlet procedure or multiresidue methods from the Pesticide...

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

.... 26124 Original unbuffered, EN 15662, mini-multiresidue 150 mg MgSO4, 25 mg PSA 2 mL 100-pk. 26215 Mini-multiresidue 150 mg MgSO4, 25 mg PSA, 25 mg C18-EC 2 mL 100-pk. 26216 — 150 mg MgSO4, 50 mg C18...

News: Matrix Effects in Multi-Residue Pesticide Analysis When Using Liquid Chromatography-Tandem Mass Spectrometry

Author(s): Kai Zhang Published By: Restek Corporation Year of Publication: 2011 Link:http://www.restek.com/Technical-Resources/Technical-Library/Editorial/mis_0026 Abstract: Matrix effects present a significant challenge to multi-residue pesticide analysis of food samples using LC/MS/MS. In this editorial, Dr. Kai Zhang, of the FDA Center for Food … Continue reading

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, money, and materials compared to modified Luke methods.

QuEChERS Sample Preparation Procedures (PDF 2089kB)

... 15662 & MINI-MULTIRESIDUE METHOD INSTRUCTIONS (cat.# 25849 and 25850) Extraction Salt Packet Contents...

Raptor ARC-18 LC Columns Sales Sheet (PDF 1872kB)

...: 2.7 μm; Temp.: 50 °C; Sample: LC multiresidue pesticide standard #1 (cat.# 31972); Diluent: Water...

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 .Existing procedures for agricultural commodities are a good starting point for multiresidue pesticidemethods...

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

..., Rugged, and Safe) methodology was developed for the determination of multiresidue pesticides in fruits (Restek, cat. # 26219); and the mini-multiresidue ... We compared the efficacy of dSPE and cSPE cleanup methods for multiresidue pesticide analysis of Qu...

QuEChERS Bibliography

... General/Original Fast and Easy Multiresidue Method International 86 (2003) 412.) QuEChERS—A Mini-Multiresidue Method for the Analysis...

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)

... analysis. In LC, multiresidue pesticide methods based on standard C18 columns suffer from poor retention power is important for multiresidue pesticide methods consisting of a large number of compounds...

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

Restek Advantage, 2012.1 (PDF 14846kB)

... Alumina MAPD Columns . . . . . 20–21 Editorial: Matrix Effects in Multi-Residue Pesticide Analysis When...

ChromaBLOGraphy: Easy Peasy: Optimized LC-QTRAP Method for Pesticide Residues

Despite what is sometimes advertised, setting up optimized methods for multiresidue pesticide analysis is typically not “easy peasy” and can be quite time consuming. Luckily, some colleagues are willing to share their method with us. Thank you Kelli, James, and Jon!* The downloadable spreadsheet contains retention times, transitions, ionization and collision parameters for our LC […]

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

ChromaBLOGraphy: 355 compounds have been added to the Rxi-XLB library for the Pro EZGC Chromatogram Modeler

The Rxi-XLB is a popular column for the analysis of PAHs and persistent environmental pollutants (POPs) such as PCBs and Pesticides. We’ve updated the library of 209 PCB congeners, expanded the PAH library to 47 compounds (including 6 deuterated isotopologues commonly used as internal standards or surrogates), and added the 203 compounds in the GC Multiresidue […]

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

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)

..., S. J. Lehotay, D. Stajnbaher, F. J. Schenck, Fast and Easy Multiresidue Method Employing , S. J. Lehotay, J. S. Wegscheid, K. A. Szpylka, Pesticide multiresidue analysis in cereal grains...

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

... how multiresidue methods are performed, sometimes decreasing the need for rigorous sample preparation effects. We considered these two aspects of multiresidue methods, sample preparation and calibration...

ChromaBLOGraphy: Great Internal Standards for Pesticide Residues…SRMs too!

  In just about all of my pesticide residue work, I use a convenient multicomponent internal standard mix that contains several PCBs as well as popular internal standard compound triphenylphosphate. The mix contains the six compounds in the chromatogram below. I have been working on a method for our GC Multiresidue Pesticides Kit which has […]

ChromaBLOGraphy: Steve Lehotay of USDA Gives Keynote Lecture at European Pesticide Residue Workshop 2012

Steve Lehotay of the USDA, a co-inventor of the QuEChERS sample preparation approach, delivered the opening lecture of EPRW 2012, “MMM means multiclass, multiresidue method, which accommodates more more more, but when is “more” enough?”.  His main point seemed to be that as analytical chemists we need to have good reason for our pesticide residue [...]

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: You want them, I got them…a lot of them: pesticides GC-MS/MS transitions

I can tell you that determining transitions (SRMs) for GC-MS/MS can be quite challenging with so many precursor ions to evaluate. I spent a considerable amount of time optimizing transitions for our GC Multiresidue Pesticide Kit which has 203 compounds. That is a lot of transitions to evaluate! I also tested my chromatographic method for […]

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 [...]

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

....J. Lehotay, D. Stajnbaher, F.J. Schenck, Fast and Easy Multiresidue Method Employing Acetonitrile Extraction...

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

.... Pesticide Analysis Ensure Product Safety with Fast, Selective Multiresidue Pesticide Analysis and reliable multiresidue pesticides analysis. Removing matrix interferences while also recovering the analytes...

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 […]

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 [...]

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

... and Drug Administration, Pesticide Analytical Manual, Volume I: Multiresidue Methods, 3rd ed. (1994). [3...

Comprehensive Pesticide Residue Analysis by LC/MS/MS Using an Ultra Aqueous C18 Column (PDF 1039kB)

... interested in more complete multi-residue analysis of pesticides in food matrices, including difficult polar...

News: Restek to Present “Gas Chromatography: Foundation Theory, Column Selection, and Troubleshooting” at GC-MS Seminar

Chromatographers from Restek will be presenting at Waters’s upcoming seminar on October 23, 2019, in Wood Dale, IL. This educational opportunity is aimed at scientists looking to learn more about GC-MS capabilities in all areas, particularly in food and environmental … Continue reading

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

ChromaBLOGraphy: Pesticides are like Siblings – some get along well and some don’t – No. . .Really?

My colleague, Joe Konschnik and I have been asked by many food chemists out there about how much they can trust their pesticides mixes after they combine them into one single larger mixture for calibrating their instrument, or monitoring the accuracy and precision of their method – and rightfully so.  Well, like siblings, sometimes they […]

QuEChERS Approach

... [1] Anastassiades, M., S.J. Lehotay, D. Stajnbaher, F.J. Schenck, Fast and Easy Multiresidue...

ChromaBLOGraphy: LC-MS/MS Ion Suppression and Other Matrix Effects – Kai Zhang Editorial

When you travel as much as I do, going from conference to conference, and country to country, you don’t do it because you love airplane food (hey, they don’t even serve food these days!).  But one of the benefits of traveling is meeting with colleagues like Kai Zhang of the US FDA, who just recently [...]

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 [...]

ChromaBLOGraphy: The North American Chemical Residue Workshop – Sharing Science and Fun in the Sun

NACRW kicked off again with the Restek Vendor Seminar.  We shared dinner and drinks while Jonathan Keim gave a very informative presentation highlighting some of the uses of the Restek EZGC Method Translator and Flow Calculator.  The translator/flow calculator has many uses including: Translating methods to increase speed of analysis by decreasing column length, decreasing […]

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

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: 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: 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: 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 […]

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

... concentration steps similar to the Soxhlet procedure or multiresidue methods from the Pesticide Analytical...

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: Restek Innovations presented at the 37th ISCC in Palm Springs, California

Like every other year the most famous meeting on capillary separation techniques was organized in the USA.; This time it was in Palm Springs.  When you visit this place you will understand where the name comes from. (picture 1). Palm trees like to have their feet in water and their heads in the sun. In [...]

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

...Regulatory requirements are driving the development of new multiresidue pesticide methods are a good starting point for multiresidue pesticide methods. For example, the QuEChERS approach to sample...

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

... multiresidue methods are performed, sometimes decreasing the need for rigorous sample preparation. However these two aspects of multiresidue methods, sample preparation and calibration strategies, in order...

Restek LC Columns and Accessories (PDF 17409kB)

...); Dimensions: 100 mm x 2.1 mm ID; Particle Size: 2.7 µm; Temp.: 50 °C; Sample: LC multiresidue pesticide ); Dimensions: 100 mm x 2.1 mm ID; Particle Size: 2.7 µm; Temp.: 50 °C; Sample: LC multiresidue pesticide...

Sitting Down With a Chromatography Icon: W. George Fong

... chromatography were also used for multiresidue analysis of chlorinated pesticides. After 6 weeks...

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

... simultaneous target and non-target compound analysis. In LC, multiresidue pesticide methods based on standard C and ametryn, and linuron and ethofumesate. This increased separation power is important for multiresidue...

ChromaBLOGraphy: [2]Troubleshooting HPLC- Loss in Response for Some, but Not All Analytes

[2]Troubleshooting HPLC- Loss in Response for Some, but Not All Analytes Patterns in your HPLC chromatography can exhibit telltale signs that point toward probable sources of error.  In this brief series of posts, we will look at possible scenarios that you may encounter in the laboratory and how you might approach resolving those difficulties. When […]

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

.... Anastassiades, S. J. Lehotay, D. Stajnbaher, F. J. Schenck, Fast and Easy Multiresidue Method Employing . Lehotay, J. S. Wegscheid, K. A. Szpylka, Pesticide multiresidue analysis in cereal grains using...

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

...: Multiresidue Methods, 3rd ed. (1994). [3] S.J. Lehotay, K. Ae Son, H. Kwon, U. Koesukwiwat, W. Fu, K...

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Residual Pesticides in Botanicals by GC-MS/MS

GC_FS0568

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