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Method Specific SPE Cartridges

...25499_spe ... Method Specific SPE Cartridges...

Resprep Oil & Grease SPE Disks

...26022_spe ... Resprep Oil & Grease SPE Disks...

Replacement Parts for Resprep SPE Manifolds

...26079_spe ... Replacement Parts for Resprep SPE Manifolds...

Resprep SPE Tube Parts & Accessories

...resprep-parts_co_spe ... Resprep SPE Tube Parts & Accessories...

Closed End SPE Cartridge: Activated Sodium Sulfate

...26207_spe ... Closed End SPE Cartridge: Activated Sodium Sulfate...

Resprep 12- or 24-Port SPE Manifolds

...26077_spe ... Resprep 12- or 24-Port SPE Manifolds ... Use with any standard male luer end SPE cartridges. Inert, PTFE sample...

Resprep SPE Cartridges (Normal Phase)

...24031_spe ... Resprep SPE Cartridges...

Resprep SPE Cartridges (Bonded Reversed Phases)

...26030_spe ... Resprep SPE Cartridges...

Pesticide Residue Cleanup SPE Cartridges

...26194_spe ... Pesticide Residue Cleanup SPE Cartridges...

Resprep CarboPrep SPE Cartridges

...26087_spe ... Resprep CarboPrep SPE Cartridges...

CarboPrep Reversing SPE Cartridges

...26206_spe ... CarboPrep Reversing SPE Cartridges...

Resprep-C18 and Resprep-C8 SPE Disks

...24048_spe ... Resprep-C18 and Resprep-C8 SPE Disks...

Resprep CarboPrep Plus SPE Cartridges

... components with superior sample cleanup. Resprep CarboPrep Plus SPE cartridges surpass traditional Florisil ... 25845_v1_spe, 25845_v2_spe ... Resprep CarboPrep Plus SPE Cartridges ... Learn how CarboPrep Plus SPE cartridges keep your GC up...

Resprep EPH Fractionation SPE Cartridge

...25999_spe ... Resprep EPH Fractionation SPE Cartridge ... Free samples of Resprep solid phase extraction (SPE) tubes are available ... -Specific Sample Preparation for EPH Analysis: Resprep SPE Cartridges for Complete Extractable Petroleum...

Q-sep QuEChERS dSPE Tubes for Extract Cleanup

Fast, Simple Sample Prep for Multiresidue Pesticide Analysis

...—graphitized carbon blackNote: No entry in the Method column refers to dSPE formulations ... 26215_spe ... Q-sep QuEChERS dSPE Tubes for Extract Cleanup ... :► How to Choose the Right dSPE for QuEChERS...

Resprep Sample Delivery System

...26250_spe ... Compatible with Resprep 1, 3, 6, and 15 mL SPE cartridges. Six PTFE...

Resprep VM-96 Vacuum Manifold for 96-Well Plates

...25858_spe ... manufacturer’s well plates and collection plates for solid phase extraction (SPE), supported liquid extraction...

Filter Insertion Tool Handle

for ASE 100/150/200/300/350

...26182_spe...

Well Plates

...26494_spe...

Universal Sealing Mats

...26498_spe...

Q-sep Tube Racks

...23995_spe...

PEEK Seals

for ASE Systems

...25393_spe...

Valves

for ASE 100/200/300 Systems

...26159_spe...

Autoseal Tip Assembly

for ASE 200/300 Systems

...26161_spe...

Tubing Assembly

for ASE 200/300 Systems

...26251_spe...

20 mm Filters

for ASE 200 Extraction Cells

...26119_spe...

30 mm Filters

for ASE 100/150/300/350 (34 mL, 66 mL, and 100 mL only) Extraction Cells

...26168_spe...

Retaining Ring Pliers

for ASE 100/150/200/300/350 Systems

...26185_spe...

Cell Cleaning Brushes

for ASE 100/150/200/300/350 Cells

...23999_spe...

Restek PAL SPME Arrow

...27489_spe...

250 mL Sample Collection Bottles

for ASE 100/150/300/350 Systems

...26191_spe...

Filter Insertion Attachments

for ASE 100/150/200/300/350

...26183_spe...

2-in-1 Filter/O-Ring Insertion Tool Kit

for ASE 100/150/200/300/350

...26181_spe...

Extraction Cell Bodies

for ASE Systems

...25994_ph_so_spe...

Thomson SINGLE StEP Low Evaporation Filter Vials

...filter-vial-low-evap_il_spe...

Restek PAL SPME Fibers

...27483_spe...

Extraction Cell Caps & Replacement Parts

for ASE Systems

...25997_spe...

Thomson SINGLE StEP eXtreme Filter Vials

...filter-vial-extrm_il_spe...

Thomson SINGLE StEP Nano Filter Vials

...filter-vial-nano_il_spe...

Syringe Filters with Luer Lock Inlet

...syr_filters_ph_so_spe...

Phenol Calibration Mix, EPA 528 (12 components)

...EPA Method 528 is a solid phase extraction (SPE)/gas chromatography/mass spectrometry screening...

Internal Standard Mix, EPA 528 (2 components)

...EPA Method 528 is a solid phase extraction (SPE)/gas chromatography/mass spectrometry screening...

Raptor EXP Guard Column Cartridges

... throughput with SPE, SLE, or other extensive sample preparations, pair 1.8 µm Raptor columns...

Resprep

Resprep solid phase extraction (SPE) tubes are manufactured with specially cleaned sorbents and high-purity materials to minimize background and help eliminate troublesome interferen...

Prepare Olive Oil Samples for Pesticide Residue Analysis in Half the Time with a Fraction of the Solvent Using dSPE (PDF 509kB)

...Simplify and speed up sample preparation with Resprep dSPE tubes! Here we show the extraction of the solvent required for conventional SPE. Olive oil is considered a healthy fat source and is a staple ... "Pesticide Residue", "sample preparation", SPE, dSPE...

Resprep EPH Fractionation SPE Cartridges Instruction Sheet (PDF 677kB)

... step appropriately. EPH Fractionation SPE Cartridges cat.# 23240, 25999 1. Confirm that the stopcock is not affected. Resprep EPH fractionation SPE cartridges are manufactured in a strictly controlled environment ... EPH, Resprep, SPE, sample prep...

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...

Prepare Olive Oil Samples for Pesticide Residue Analysis in Half the Time With a Fraction of the Solvent Using dSPE

... and speed up sample preparation with Resprep dSPE tubes! Here we show the extraction of the solvent required for conventional SPE ... Simplify and speed up sample preparation with Resprep dSPE tubes! Here we show the extraction of the solvent required for conventional SPE. ... "Pesticide Residue", "sample preparation", SPE, dSPE...

Resprep Sample Delivery System Instruction Sheet (PDF 614kB)

...) adapter on the opposite end. Product Details: • Compatible with Resprep 1, 3, 6, and 15 mL SPE . Instructions 1. Rinse apparatus with a suitable solvent and dry before use. 2. Condition the SPE cartridge...

Improve GC Analysis of Extractable Petroleum Hydrocarbons Using Resprep EPH Fractionation SPE Cartridges (PDF 1888kB)

...Improve GC Analysis of Extractable Petroleum Hydrocarbons Using Resprep EPH Fractionation SPE into hexane, and concentration, followed by fractionation and cleanup using solid phase extraction (SPE...

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 extraction (dSPE) cleanup and the more traditional cartridge solid phase extraction (cSPE) cleanup...

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

... technicians. Here we demonstrate a procedure that incorporates a QuEChERS extraction, cSPE cleanup dispersive solid phase extraction (dSPE) cleanup of the extract. Because of these benefits, the approach has...

Florisil SPE Cartridge Instruction Sheet (PDF 222kB)

...Florisil SPE Cartridge cat.# 24031, 24032, 24034, 26085, 26086, 26228 Procedure for Florisil SPE cleanup of chlorinated pesticide extracts following EPA Method 3620C* Cartridge: 1,000 mg...

Resprep 12- & 24-Port Manifolds Instruction Sheet (PDF 517kB)

.... Introduction Resprep vacuum manifolds for SPE sample preparation, filtration, and elution are available in 12 an SPE column, cartridge, or disk. Adjustable racks placed in the glass vacuum chamber accommodate...

CarboPrep 90 SPE Cartridge Instruction Sheet (PDF 223kB)

...Procedure for CarboPrep 90 SPE cleanup of chlorinated pesticide extracts* Cartridge: 250 mg Carbo sample in hexane. Elution: • Pull the sample through the CarboPrep 90 SPE cartridge at a drop-wise rate...

Resprep VM-96 Vacuum Manifold Instruction Sheet (PDF 2708kB)

...-well plate sample preparation methods. It is compatible with solid phase extraction (SPE), supported can be used with SPE, SLE, PPT, and filtration 96-well plates. See the instructions below for general...

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

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

Florisil SPE Cleanup for Chlorinated Pesticides Analysis (PDF 936kB)

...Florisil SPE Cleanup for Chlorinated Pesticides Analysis Many chlorinated pesticides have been contaminants (like trichlorophenol) with Florisil columns or Florisil solid phase extraction (SPE) tubes...

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 , dSPE cleanup, and GC-TOFMS analysis were used to assess pesticide levels in strawberries and spinach...

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

...-and-shoot standards reduce human error. Cartridge SPE cleanup removes matrix interferences .   PAM 303 Method QuEChERS + cSPE Benefits of QuEChERS + cSPE ... PAM 303, SPE, cSPE, QuEChERS, pesticides, multiresidue, dietary supplements, sample prep...

Resprep Sample Preparation by Solid Phase Extraction (SPE) Instruction Sheet (PDF 368kB)

...Resprep Sample Preparation by Solid Phase Extraction (SPE) Solid Phase Extraction: 1. Choose are approximations that must be adjusted to specific sample and analyte characteristics. 2. Conditioning: • All SPE...

QuEChERS Sample Preparation Procedures (PDF 2089kB)

... phase extraction media (dSPE). Sugars, fatty acids, organic acids, pigments, lipids, and other potential .restek.com/quechers to determine which dSPE product works best for your sample type. Stage 1: Sample Extraction ORIGINAL...

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

... of Agriculture.1 In addition to using less solvent and materials versus conventional SPE methods, Qu EChERS employs a novel and much quicker dispersive solid phase extraction cleanup (dSPE). QuEChERS methods...

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

... and centrifugation step, with an optional dispersive solid phase extraction (dSPE) cleanup. In addition to being dispersive solid phase extraction methods (dSPE) were compared. For each, 1 mL portions of QuEChERS extracts...

Keep Your Instruments Up and Running with CarboPrep Plus SPE Cartridges (PDF 4848kB)

...Keep Your Instruments Up and Running with CarboPrep Plus SPE Cartridges • Maximum Contaminant preparation product—activated Florisil SPE cartridges—just isn’t up to the job of removing the worst of those...

Resprep VM-96 Vacuum Manifold (PDF 2579kB)

... solid phase extraction (SPE), supported liquid extraction (SLE), protein precipitation (PPT phase extraction (SPE), supported liquid extraction (SLE), protein precipitation (PPT), and filtration...

High-Throughput Analysis of Mycotoxins in Cannabis CBD Oil Pairs Simplified Cleanup with LC-MS/MS Sensitivity (PDF 1230kB)

... cycle time lets you analyze more samples per shift. • Resprep SPE sample cleanup removes matrix to columns being specific for aflatoxins or ochratoxins. In this study, a simple pass-through SPE sample...

Improve EPH Testing Accuracy and Efficiency with Resprep EPH Fractionation SPE Cartridges (PDF 3207kB)

... EPH Fractionation SPE Cartridges www.restek.com 2 www.restek.com • Method-specific performance yours today at www.restek.com/resprep Figure 1: Resprep EPH SPE cartridges offer consistent...

CarboPrep Plus Instruction Sheet (PDF 205kB)

...CarboPrep Plus SPE Cartridges cat.# 25845 Caution: For best results, it is important to work . To ensure cartridge quality: • Resprep CarboPrep Plus SPE cartridges are manufactured in a strictly...

A New Solution for Trace-Level Analysis of 1,4-Dioxane in Drinking Water: Large Volume Injection in an Unmodified Splitless GC Inlet (PDF 3293kB)

... Chromatography Products www.restek.com 1 Set up for Success • Resprep SPE cartridges assure clean extracts ,4-dioxane, and 1,4-dioxane-d8) and the SPE elution solvent (dichloromethane) are too similar. While PTV...

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

... the use of a dispersive solid phase extraction (dSPE) step that is also quick and easy to perform of dSPE. Stage 2 offers a variety of cleanup options that can be selected to match the specific...

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

... extraction (dSPE) cleanup and the more traditional cartridge solid phase extraction (cSPE) cleanup that the dSPE cleanup formulation with 7.5 mg of carbon (verses 50 mg) provided the best recovery of targeted ... We compared the efficacy of dSPE and cSPE cleanup methods for multiresidue pesticide analysis of Qu EChERS extracts of finished tobacco products using GCxGC-TOFMS. Cleanup with dSPE tubes containing 7.5 mg of GCB...

Grace Chromatography Consumables Cross Reference

Are you looking for an alternate source for chromatography products similar to those you once ordered from W. R. Grace? Restek has you covered with a...

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

...   Spinach Conclusion Abstract QuEChERS extraction, dSPE commercial and Amish growers. Various dSPE cleanup products were compared to determine which were most ... 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. Various dSPE sorbent products...

Combined Determination of 1,4-Dioxane and Nitrosamine Contaminants in Drinking Water Using SPE and CSR-LVSI GC-MS (PDF 793kB)

... a Single SPE Cartridge and Concurrent Solvent Recondensation–Large Volume Splitless Injection (CSR -MS/MS). The method described here uses the same coconut charcoal sorbent solid phase extraction (SPE) cartridges...

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)

... pesticides in the most complex samples. In this regard, dispersive SPE (dSPE) cleanup was ineffective phase extraction (dSPE) cleanup of the extract. It is well established that QuEChERS can result in good...

Lowering Detection Limits for 1,4-Dioxane in Drinking Water Using Large Volume Injection in an Unmodified Splitless GC Inlet (PDF 722kB)

...-per-trillion (ppt) analysis of drinking waters using solid phase extraction (SPE) cartridges and gas chromatography differences in boiling point. The SPE elution solvent described in the method is dichloromethane (DCM), which...

Thermal Desorption: A Practical Applications Guide: IV. Food, Flavour, Fragrance & Odour Profiling (PDF 1952kB)

...)1443 230935 F: +44 (0)1443 231531 E: enquiries@markes.com W: www.markes.com SPE-tD cartridges Markes’ SPE (-MS) analysis. After equilibration, the SPE-tD cartridge is removed from the sample, rinsed in pure water...

Resprep Resin Disk Instruction Sheet (PDF 128kB)

...-filter properties of this SPE disk, a high flow rate of 50-70mL/min. can be achieved with no decrease in recoveries...

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 EChERS extraction method [2] with cartridge solid phase extraction (cSPE) cleanup to prepare dietary supplement ... The novel approach used here combines QuEChERS extraction, cartridge SPE cleanup, and GCx...

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 […]

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

.... Cartridge SPE cleanups of dirty extracts improve GC inlet and column lifetimes. Selective GC a simple QuEChERS extraction approach with cartridge SPE (cSPE) cleanup, followed by GCx ... challenging due to matrix complexity. The use of QuEChERS, cartridge SPE cleanup, and GCxGC-TOFMS as presented...

Improve EPH Testing Accuracy and Efficiency with Resprep EPH Fractionation SPE Cartridges

...-saving, and solvent reduction. Figure 1: Resprep EPH SPE cartridges . Table I: Whether you use 5 g or 2 g formats, Resprep EPH fractionation SPE cartridges deliver ... New and improved Resprep EPH fractionation SPE cartridges from Restek completely separate aliphatic...

News: Resprep EPH Fractionation SPE Cartridges: Now Available in a 2 g Format

Resprep EPH fractionation SPE cartridges offer method-specific performance for extractable petroleum hydrocarbon (EPH) analysis of soil and water samples. These high-performing SPE cartridges completely separate aliphatic and aromatic compounds into distinct fractions, and they are guaranteed to produce background levels … Continue reading

A Guide to the Analysis of Halogenated Environmental Pollutants Using Electron Capture Detection (PDF 8131kB)

......................................................3 Separatory Funnel Extraction Continuous Liquid-Liquid Extraction Solid Phase Extraction (SPE of solvent is based on the design of the extractor. Solid Phase Extraction (SPE) Solid phase extraction...

News: Method-Specific Sample Preparation for EPH Analysis

Choose New and Improved Resprep SPE Cartridges for Complete Extractable Petroleum Hydrocarbon Fractionation Resprep EPH fractionation SPE cartridges offer method-specific performance for extractable petroleum hydrocarbon (EPH) analysis of soil and water samples. These new and improved solid phase extraction (SPE) … Continue reading

Keep Your Instruments Up and Running with CarboPrep Plus SPE Cartridges

... SPE cartridges—just isn’t up to the job of removing the worst of those sample matrix contaminants something different. Fortunately, new Resprep CarboPrep Plus SPE cartridges outperform Florisil cartridges...

Featured Application: Mycotoxins in Cannabis CBD Oil on Raptor Biphenyl High-Throughput Analysis of Mycotoxins in Cannabis CBD Oil Pairs Simplified Cleanup with LC-MS/MS Sensitivity

..., 3-min total cycle time lets you analyze more samples per shift. Resprep SPE sample cleanup . In this study, a simple pass-through SPE sample cleanup was developed as an alternative to IACs and applied ... by this simple pass-through SPE sample cleanup. Paired with LC-MS/MS analysis using a Raptor Biphenyl column...

A Guide to Preparing and Analyzing Chlorinated Pesticides (PDF 4038kB)

...-Extractants: Adsorbent SPE Tubes Double-Bond, Triple-Bond, or Aromatic Compound Contamination: Sulfuric Acid Cleanup . According to US EPA Method 3535, solid phase extraction (SPE) can be used to extract pesticide compounds...

Rapid, Simple 4.5-Minute Pyrrolizidine Alkaloids Analysis by LC-MS/MS (PDF 1056kB)

... digestion, an SPE C18 cleanup, and analysis via LC-MS/MS. The example method provided in the BfR protocol .0/2014, Bestimmung von Pyrrolizidinalkaloiden (PA) in Pflanzenmaterial mittels SPE-LC-MS/MS, 2014. https...

Fast, Simple Sample Cleanup Using QuEChERS SPE Tubes

... and materials versus conventional SPE methods, QuEChERS employs a novel and much quicker dispersive solid phase extraction cleanup (dSPE). QuEChERS methods, including an AOAC Official Method [2] and modifications ... (dSPE). QuEChERS methods are convenient, rugged methods that simplify extract cleanup, reduce...

Resprep-C18–47 SPE Disks Instruction Sheet (PDF 138kB)

...Resprep-C18-47 SPE Disks cat.# 24004 Operating Instructions IMPORTANT: Apparatus. When using...

Resprep-C8–47 SPE Disks Instruction Sheet (PDF 18kB)

...Resprep-C8–47 SPE Disks (cat.# 24048) Physical Description & Data Disk appearance: Disk diameter...

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: 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 […]

Simultaneous Analysis of Catecholamines and Metanephrines in Urine by LC-MS/MS (PDF 1289kB)

... chromatographic performance. To solve these problems, a simple and fast solid phase extraction (SPE) procedure . The fortified standard and QC samples were subjected to the SPE procedure described above. Urine Analysis...

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

Rugged, Low-Bleed Performance for Challenging GC-MS Work (PDF 4054kB)

... in Drinking Water Using a Single SPE Cartridge and Concurrent Solvent Recondensation– Large Volume Splitless solid phase extraction (SPE) cartridges and dichloromethane eluent recommended in EPA Methods 522...

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

News: Keep Your Instrument Up and Running with CarboPrep Plus SPE Cartridges

Keep your organochlorine pesticide GCs up and running by protecting them against matrix components with superior sample cleanup. Resprep CarboPrep Plus SPE cartridges surpass traditional Florisil products in cleanup power for sample matrix compounds that cause active sites in GC … Continue reading

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 [...]

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

... Hill, MA). QuEChERS extraction and dispersive solid phase extraction (dSPE) tubes, as well as Qu .restek.com 4 QuEChERS Dispersive Solid Phase Extraction (dSPE) Cleanup Restek Q-sep dSPE tubes were used...

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)

...-intensive modified QuEChERS extraction and silica solid phase extraction (SPE) sample cleanup method was developed L of extract down to 1 mL, then adjust final volume to 2 mL with hexane. Perform this step twice. Silica SPE...

Simplified Methylmalonic Acid Analysis without Derivatization in Human Plasma by LC-MS/MS (PDF 584kB)

...-treatment using liquid-liquid extraction, derivatization, solvent evaporation, and/or SPE. Additionally...

Dissecting Raptor LC Columns: A closer look at a new species (PDF 1725kB)

... to minimize extra column volume and maximize UHPLC sample throughput when using SPE, SLE, or other extensive...

Trace-Level Analysis of Metanephrines in Plasma by HILIC LC-MS/MS (PDF 712kB)

...-Si column. Combined with a simple solid phase extraction (SPE) procedure, an accurate and precise analysis . The fortified standard and QC samples were prepared using the SPE procedure described above. LC-MS/MS analysis...

A Primer on Gas Flow (PDF 1253kB)

...-0303 EPA, NIST SATP SPE SPE, U.S. OSHA, SCAQMD EGIA, OPEC, U.S. EIA ICAO’s ISA, ISO 13443, EEA, EGIA...

Fast, Accurate LC-MS/MS Method for Folate Deficiency Biomarkers in Plasma (PDF 513kB)

... WAX 30 mg SPE plate (Biotage 604-0030-PX01) with 1 mL methanol and then equilibrate with 1 mL 2...

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

.... • Condition the GCB/PSA (0.25 g/0.5 g) SPE columns with ~250 mg anhydrous Na2SO4 on top using 3 column volumes of acetone. • Insert a collection rack consisting of 15 mL disposable glass centrifuge tube on a SPE vacuum...

Restek Essentials: Featured Chromatography Products 2019.3 (PDF 6194kB)

...Prep Plus SPE cartridges In stock and ready for your lab! • Proprietary treatment renders the carbon EPH Fractionation SPE Cartridge 6 mL, 2 g 30-pk. 25999 Description Volume qty. cat.# Resprep Carbo...

Cannabis

...ufactured and QC tested in our ISO-accredited laboratories, along with a huge offering of pesticide standards. Q-sep QuEChERS products and Resprep SPE tubes make medicinal marijuana sample preparation fast and easy. And, whether you use GC or LC, Restek columns and accessories are known worldwide...

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

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 [...]

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

News: Evaluation of QuECheRS, Cartridge SPE Cleanup, and Gas Chromatography Time-of-Flight Mass Spectrometry for the Analysis of Pesticides in Dietary Supplements

Author(s): Julie Kowalski, Michelle Misselwitz, Jason Thomas, Jack Cochran Published By: LCGC North America Year of Publication: 2010 Link: http://www.chromatographyonline.com/lcgc/Articles/Analysis-of-Pesticides-in-Dietary-Supplements/ArticleStandard/Article/detail/697436 Abstract: The FDA is responsible for regulation of dietary supplements as foodstuffs through the 1994 Dietary Supplement Health and Education … 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

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 Essentials: Featured Chromatography Products 2019.1 (PDF 4834kB)

... mm autosamplers, including UHPLC instruments. 15 mL dSPE tubes also available at www EChERS dSPE Tubes for Extract Cleanup Ready-to-use tubes packaged in foil for enhanced protection...

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

..., cleaned up using dSPE, and analyzed using a 2.7 μm Raptor ARC-18 column. The inherent efficiency of a 2 centrifugation, 1 mL supernatant was added to a 2 mL dSPE vial containing magnesium sulfate, PSA, and C18 (cat...

Raptor SPP C18 Columns Sales Sheet (PDF 1888kB)

... using SPE, SLE, or other extensive sample preparations. Protect your investment, extend the life of our...

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

..., and maximize UHPLC sample throughput when using SPE, SLE, or other extensive sample preparations. Raptor SPP...

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 [...]

Restek Advantage, 2012.1 (PDF 14846kB)

... using Q-sep QuEChERS extraction salts and dSPE tubes. QuEChERS (Quick phase extraction (dSPE) cleanup of the extract. The foods chosen varied in water, fat, and pigment...

Restek Essentials (PDF 1623kB)

... UHPLC. Le provette dSPE da 15 mL sono disponibili anche su www.restek.com/it/quechers. Qu dello 0,4% di evaporazione nell'arco delle 24 ore. Q-sep QuEChERS dSPE Provette per la pulizia dell...

ChromaBLOGraphy: Material Composition of Resprep® Manifold Replacement Parts

A customer asked me yesterday what material certain items for our SPE manifolds were made from.  The answers are below.     Catalog # 26083 is Nylon Catalog #’s 26130 & 26131 are Polypropylene Catalog # 26084 is PTFE   For those of you who need to avoid sample contact with PTFE, we also sell […]

News: Resprep VM-96 Vacuum Manifold now Available

Restek is pleased to announce the launch of the new Resprep VM-96 vacuum manifold. Designed for performance, versatility, ergonomics, and accuracy, this new product is suitable for everyday solid phase extraction (SPE), supported liquid extraction (SLE), protein precipitation (PPT), and … Continue reading

Raptor FluoroPhenyl LC Columns Sales Sheet (PDF 1816kB)

..., and maximize UHPLC sample throughput when using SPE, SLE, or other extensive sample preparations. Protect your...

News: Combined Determination of 1,4-Dioxane and Nitrosamine Contaminants in Drinking Water Using a Single SPE Cartridge and Concurrent Solvent Recondensation–Large Volume Splitless Injection (CSR-LVSI) With EI GC-MS

Author(s): Chris Rattray and Jack Cochran Restek Corporation Published By: Restek Corporation Year of Publication: 2014 Link: http://www.restek.com/Technical-Resources/Technical-Library/Environmental/env_EVAN1922-UNV Abstract: Global concern over the carcinogenic potential of 1,4-dioxane and several nitrosamines has resulted in increased interest in the development of more … Continue reading

QuEChERS Approach

... and cleaned, using a dispersive SPE technique. Multiple adsorbents are placed in a centrifuge tube, along .quechers.com Using the dispersive SPE approach, the quantity and type of adsorbents can be easily adjusted...

How to Avoid Common Problems with HILIC Methods (PDF 563kB)

... is that if you are using SPE for sample prep, you are eluting in a highly organic solvent, so the sample extract...

Raptor Biphenyl LC Columns Sales Sheet (PDF 3731kB)

..., and maximize UHPLC sample throughput when using SPE, SLE, or other extensive sample preparations. 1,034 bar/15...

QuEChERS Solutions

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

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 [...]

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

... shake and centrifugation step, with an optional dispersive solid phase extraction (dSPE) cleanup Four dispersive solid phase extraction methods (dSPE) were compared. For each, 1 mL portions of Qu...

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: Meet Low ng/L Detection Limits for Volatiles in Drinking Water Using Coconut Charcoal Cartridge SPE and a 50 µL Injection in an Unmodified Agilent Split/Splitless inlet – Find out how at the NEMC Drinking Water Section Thursday Afternoon

  I’ve been working on combining EPA methods 521 and 522 for a while. Both methods use the same SPE cartridge and very similar extraction procedures. In order to meet extremely low PPT detection limits required by 521 on my 7890A-5975C, I had to resort to a 50 µL injection. Generally,a special injection port such [...]

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 […]

ChromaBLOGraphy: Pain panel causing you pain?

Particularly if you are using an AB Sciex’s iMethod™ for pain management drugs in urine, you might be noticing a shorter lifetime on your Ultra Biphenyl columns. These are challenges that we are facing and currently looking for the best solution. Since those methods in question do not contain cleanup methods such as SPE, the [...]

Sample Preparation Techniques Used for Gas Chromatography

...-phase extraction (SPE): may be used to concentrate analytes from gaseous or liquid samples and often is used are solid-phase extraction (SPE), solid-phase microextraction (SPME) and stir bar sorptive...

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 [...]

Guide to Preparing and Analyzing Semivolatile Organic Compounds (PDF 6275kB)

... this accelerated technique. Finally, solid phase extraction (SPE) also may be used to extract semivolatile organic compounds from aqueous samples. When using SPE, it is extremely important to follow the manufacturer...

Analyze Seven EPA Methods on One GC Column Pair! Pesticides, PCBs, Herbicides, and More on Rtx-CLPesticides & Rtx-CLPesticides2 Columns (PDF 5571kB)

...: Liners for Split Injection with Agilent GCs Resprep SPE Cartridges (Normal Phase) Hydrophilic (polar . SPE Cartridge Tube Volume, Bed Weight qty. cat.# CarboPrep 90 3 mL, 250 mg 50-pk. 26091 Carbo...

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 [...]

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 [...]

Frequently Asked Questions: Sample Preparation

Frequently Asked Questions: Sample Preparation FAQ

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 of Restek columns with QuEChERS and cSPE, you can easily quantify pesticides in dietary supplements...

ChromaBLOGraphy: Extractable Petroleum Hydrocarbons (EPH) – Lot to Lot Reproducibility of Resprep EPH Cartridges

As previously discussed in my last blog, “Extractable Petroleum Hydrocarbons (EPH) Method – Why it is important?”, Restek’s Resprep EPH Fractionation SPE Cartridges (cat # 25859) provide method-specific performance for EPH analysis of soil and water samples through complete separation of aliphatic and aromatic compounds into distinct fractions, while providing extractable background levels guaranteed to […]

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 [...]

Method 8081B: Organochlorine Pesticides Analysis by GC (Extended)

...)   Florisil SPE Cleanup for Chlorinated Pesticides Analysis (1.12 MB )   Keep Your Instruments Up and Running with CarboPrep Plus SPE Cartridges(PDF - 4845k...

Method 8082A: Polychlorinated Biphenyls (PCBs) Analysis by GC

...)   Florisil SPE Cleanup for Chlorinated Pesticides Analysis (1.12 MB )   Keep Your Instruments Up and Running with CarboPrep Plus SPE Cartridges(PDF - 4845k...

Method 8151A: Chlorinated Herbicides Analysis by GC Using Methylation or Pentafluorobenzylation Derivatization

...)   Florisil SPE Cleanup for Chlorinated Pesticides Analysis (1.12 MB )   Keep Your Instruments Up and Running with CarboPrep Plus SPE Cartridges(PDF - 4845k...

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

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

News: High-Throughput Analysis of Mycotoxins in Cannabis CBD Oil Pairs Simplified Cleanup with LC-MS/MS Sensitivity

Published By: Restek Corporation Year of Publication: 2018 Link: http://www.restek.com/Technical-Resources/Technical-Library/Foods-Flavors-Fragrances/fff_FFSS2946-UNV Abstract: Complex, time-consuming immunoaffinity column sample prep protocols for mycotoxins can be replaced by this simple pass-through SPE sample cleanup. Paired with LC-MS/MS analysis using a Raptor Biphenyl column, excellent chromatographic results were … Continue reading

ChromaBLOGraphy: PittCon Conferee Networking Session: Sample Preparation

I went to a networking session at PittCon 2009, “Sample Preparation: The Do’s and Dont’s to Determine the Correct Approach and Optimization of a Method”. Joan Stevens, Applications Manager at Gilson, facilitated. Standing room only attendance, great discussions on sample prep (mainly SPE), and seeing old friends (Ray Clement from Ministry of Environment in Toronto; [...]

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 [...]

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: 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 [...]

Evaluation of a Simple Method for Methylmalonic Acid Analysis in Human Plasma by LC-MS/MS (PDF 735kB)

... evaporation, and/or SPE. Additionally, chromatographic resolution can be difficult to achieve between MMA...

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 [...]

ChromaBLOGraphy: Extractable Petroleum Hydrocarbon (EPH) – Extractable Background of Resprep EPH Cartridges

Restek’s Resprep EPH Fractionation SPE Cartridges (cat # 25859) provide method-specific performance for EPH analysis of soil and water samples through complete separation of aliphatic and aromatic compounds into distinct fractions, while providing extractable background levels guaranteed to fall under the strict reporting limits of Massachusetts and New Jersey EPH methods.   The cleanliness of […]

One Stop Shop for EPA Method 535 Reliably Analyze Acetamide Herbicide Degradates by LC/MS/MS

... Full package: reference standards, SPE cartridges, and HPLC columns (SPE) cartridges, and HPLC columns that meet method guidelines. In the procedure shown here, 6mL Carbo...

Rxi-5Sil MS Columns: Assured Performance for Forensic Applications (PDF 3420kB)

... and extracted by SPE, then derivatized with propionic anhydride. Acknowledgement Data courtesy of Miami Dade...

High-Throughput Analysis of Immunosuppressive Drugs from Whole Blood by LC-MS/MS (PDF 524kB)

... an additional in-line trap column or SPE sample cleanup prior to chromatographic analysis. Here, we reduced...

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

... using SPE, SLE, or other extensive sample preparations. Raptor EXP Guard Cartridges—for All Raptor...

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

... Resprep Resin SPE Disk (cat.# 26023) following EPA Method 527 protocol. Extracts were dried...

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

... Extraction Cleanup SPE Cartridge qty. cat.# 6 mL Combo SPE Cartridge Packed with 500 mg CarboPrep 90 /500 mg PSA, Polyethylene Frits 30-pk. 26194 Pesticide Residue Cleanup SPE Cartridges • Convenient...

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...

Raptor FluoroPhenyl LC Columns Brochure (PDF 3042kB)

... particulates, minimize extra column volume, and maximize UHPLC sample throughput when using SPE, SLE...

Method 8081B: Organochlorine Pesticides Analysis by GC Get results in seven minutes

...)   Florisil SPE Cleanup for Chlorinated Pesticides Analysis (1.12 MB )   Keep Your Instruments Up and Running with CarboPrep Plus SPE Cartridges(PDF - 4845k...

Featured Application: Pyrrolizidine Alkaloids on Raptor ARC-18 Rapid, Simple 4.5-Minute Pyrrolizidine Alkaloids Analysis by LC-MS/MS

... Institute for Risk Assessment (BfR) [1]. It employs a sulfuric acid digestion, an SPE C18 cleanup Pyrrolizidinalkaloiden (PA) in Pflanzenmaterial mittels SPE-LC-MS/MS, 2014...

Method 508.1: Determination of Chlorinated Pesticides and Herbicides Analysis by Liquid-Solid Extraction and Electron Capture GC

...)   Florisil SPE Cleanup for Chlorinated Pesticides Analysis (1.12 MB )   Keep Your Instruments Up and Running with CarboPrep Plus SPE Cartridges (PDF - 4845k...

Analysis of Synthetic Cannabinoids and Metabolites: Adding New Compounds to an Existing LC-MS/MS Method (PDF 870kB)

....0). - Incubate at 60 °C for 3 hours. 3) Extract sample on 6 mL, 500 mg C18 high-load end-capped Resprep SPE...

Raptor C18 LC Columns Brochure (PDF 2375kB)

... volume, and maximize UHPLC sample throughput when using SPE, SLE, or other extensive sample preparations...

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

... These are just our starter kits; visit www.restek.com/radiello for our full selection! For ready-to-use dSPE...

Raptor Biphenyl LC Columns Brochure (PDF 6071kB)

... using SPE, SLE, or other extensive sample preparations. EXP Reusable Fittings for HPLC & UHPLC for 10...

ChromaBLOGraphy: Great Day of QuEChERS at FPRW

We were lucky enough at the Florida Pesticide Residue Workshop today to see the inventors of QuEChERS, Steve Lehotay of USDA and Michelangelo Anastassiades of CVUA-Stuttgart, talk about methods (and approaches; there is a difference!) in a session after the main FPRW program.  Interesting points were raised about method modifications, including solvents used, choice of [...]

Featured Application: Methylmalonic Acid (MMA) on Force C18 Simplified Methylmalonic Acid Analysis without Derivatization in Human Plasma by LC-MS/MS

... evaporation, and/or SPE. Additionally, chromatographic resolution can be difficult to achieve between...

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

... for determining certain pesticides in the most complex samples. In this regard, dispersive SPE (dSPE) cleanup to extract pesticide residues from fruits and vegetables, followed by a dispersive solid phase extraction (dSPE...

ChromaBLOGraphy: Extractable Petroleum Hydrocarbons (EPH) Method – Why it is important?

Spills and releases of petroleum fuels are the largest source of environmental contamination in the United States. Massachusetts published a method that addresses the need to account for semi-volatile aliphatic and aromatic fractions of gasoline using gas chromatography (GC) analysis and a flame ionization detector (FID). This method was designed to measure the collective concentrations […]

A Novel Solution for Vitamin K₁ and K₂ Analysis in Human Plasma by LC-MS/MS (PDF 1398kB)

... methods use liquid-liquid extraction paired with silica-based SPE to separate polar and nonpolar lipids...

Restek Essentials (PDF 1881kB)

... trovare le provette dSPE pronte all’uso e altri prodotti QuEChERS alla pagina www...

Combined Determination of 1,4-Dioxane and Nitrosamine Contaminants in Drinking Water Using a Single SPE Cartridge and Concurrent Solvent Recondensation–Large Volume Splitless Injection (CSR-LVSI) with EI GC-MS

... points. The SPE elution solvent used for the work presented here is dichloromethane (DCM), which has ]. Experimental Solid Phase Extraction (SPE) Since a single SPE cartridge was to be utilized...

Simultaneous Analysis of Catecholamines and Metanephrines in Urine by LC-MS/MS

... these problems, a simple and fast solid phase extraction (SPE) procedure was developed, followed by LC . The fortified standard and QC samples were subjected to the SPE procedure described above. Urine...

ChromaBLOGraphy: Pesticides in Dietary Supplements

I was at the Recent Advances in Food Analysis conference in Prague last week and presented work on analyzing pesticides in dietary supplements, a very important subject given that FDA is moving to regulate these products. They are very complex herbal, botanical, etc. materials, which makes looking for trace level components very tricky. My colleagues, [...]

Restek Essentials (PDF 6898kB)

... des kits : consultez www.restek.fr Tubes QuEChERS Q-sep pour purification d'extraits par dSPE...

Lowering Detection Limits for 1,4-Dioxane in Drinking Water Using Large Volume Injection in an Unmodified Splitless GC Inlet

... was developed for part-per-trillion (ppt) analysis of drinking waters using solid phase extraction (SPE injection port for Method 522 due to inadequate differences in boiling point. The SPE elution solvent...

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Jet Fuel on Rxi-1ms by GC-VUV (ASTM D8267)

GC_PC1359

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Florisil SPE Extraction Blank

GC_EV1295

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TCDDs on Rtx-Dioxin2 Column

GC_EV1239

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TCDFs on Rtx-Dioxin2 Column

GC_EV1252

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