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Chromatography Columns > GC Columns

Browse our complete line of GC Columns

Chromatography Columns > HPLC & UHPLC Columns

Browse our complete line of HPLC & UHPLC Columns

Resprep SPE Tube Parts & Accessories

...Resprep tubes, frits, caps, and connectors for your method development needs....

Phenol Calibration Mix, EPA 528 (12 components)

... method developed to measure 12 environmentally important phenols in drinking water and determine whether . We developed a full set of standards for Method 528—calibration...

Internal Standard Mix, EPA 528 (2 components)

... method developed to measure 12 environmentally important phenols in drinking water and determine whether for drinking water monitoring, based on current health effect information. We developed a full set...

Pesticide Residue Cleanup SPE Cartridges

... M. Shafrir, D. Avisar, Development method for extracting and analyzing antibiotic...

Autosampler Syringes (Hamilton)

for PerkinElmer Autosystem and Clarus 500 GCs

... is developed specifically to withstand multiple, fast injections through a septum. ...

Autosampler Syringes (SGE)

for PerkinElmer Autosystem and Clarus 500 GCs

.... Unique plunger design eliminates bending and seizing. Needle point style is developed...

EPA Method 525.3 PAH IS Mix (3 components)

... Developed specifically for EPA Method 525.3. Formulated to provide maximum...

EPA Method 525.3 PCP IS

... Developed specifically for EPA Method 525.3. Formulated to provide maximum...

EPA Method 525.3 Surrogate Standard (3 components)

... Developed specifically for EPA Method 525.3. Formulated to provide maximum...

GCxGC Selectivity Kit, 0.15 mm

..., and detectors. Secondary columns come in convenient 2 m lengths for economical methods development. ...

GCxGC Selectivity Kit, 0.18 mm

..., and detectors. Secondary columns come in convenient 2 m lengths for economical methods development. ...

GCxGC Selectivity Kit, 0.25 mm

..., and detectors. Secondary columns come in convenient 2 m lengths for economical methods development. ...

ASI Replacement HPLC Pump Piston Rods

for Waters HPLC Systems

... system pressure and/or irregular or poor peak shape. As the piston continues to wear, a leak may develop...

ASI Replacement HPLC Pump Piston Rods

for Agilent HPLC Systems

... system pressure and/or irregular or poor peak shape. As the piston continues to wear, a leak may develop...

CarboPrep Reversing SPE Cartridges

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

Res-Sil Packing Materials

... by developing Res-Sil C packings for consistent performance.Unique Selectivity for Process GC and High in series, provides petroleum and petrochemical method developers with a powerful tool for fast...

Rt-βDEXcst Columns (fused silica)

Proprietary cyclodextrin material added into 14% cyanopropylphenyl/86% dimethyl polysiloxane

...Uses: Proprietary stationary phase, developed specifically for the fragrance industry. Also...

Syringe Filters with Luer Lock Inlet

... for method development or to compare with your current brand. Request yours today by adding -248 to the part...

EPA Method 525.3 OCP Cal Standard (29 components)

... Developed specifically for EPA Method 525.3. Formulated to provide maximum...

EPA Method 525.3 OPP Cal Standard (16 components)

... Developed specifically for EPA Method 525.3. Formulated to provide maximum...

EPA Method 525.3 PAH Cal Standard (20 components)

... Developed specifically for EPA Method 525.3. Formulated to provide maximum...

EPA Method 525.3 PCB Cal Standard (14 components)

... Developed specifically for EPA Method 525.3. Formulated to provide maximum...

Molecular Sieve Columns (packed)

.... Restek's R&D chemists have developed a process for preparing molecular sieve packings, which result...

MOSH/MOAH Standard (9 components)

... Developed specifically for using LC coupled with GC-FID to accurately determine...

MOSH/MOAH Retention Time Standard (10 components)

... Developed specifically for using LC coupled with GC-FID to accurately determine...

Rt-608Pkd Columns (packed)

Optimized for pesticide analysis by US EPA Method 608.

... analysis times (nearly 40 minutes). Restek has developed a special packing material that exceeds EPA...

Rxi-17Sil MS Secondary Columns for GCxGC (fused silica)

midpolarity Crossbond phase

.... The Restek chemists also have developed a stable, reproducible manufacturing process, so that Rxi columns...

Rxi-1ms Secondary Columns for GCxGC (fused silica)

nonpolar phase; Crossbond dimethyl polysiloxane

.... The Restek chemists also have developed a stable, reproducible manufacturing process, so that Rxi columns...

Rtx-2330 Columns (fused silica)

highly polar phase; biscyanopropyl cyanopropylphenyl polysiloxane

.... To overcome some of these problems, we developed a surface treatment that is more compatible with the Rtx-2330...

Rxi-17 Columns (fused silica)

midpolarity phase; Crossbond diphenyl dimethyl polysiloxane

.... The Restek chemists also have developed a stable, reproducible manufacturing process, so that Rxi columns...

Rxi-1ms Columns (fused silica)

nonpolar phase; Crossbond dimethyl polysiloxane

.... The Restek chemists also have developed a stable, reproducible manufacturing process, so that Rxi columns...

Rxi-5ms Columns (fused silica)

low-polarity phase; Crossbond diphenyl dimethyl polysiloxane

.... The Restek chemists also have developed a stable, reproducible manufacturing process, so that Rxi columns...

Rxi-5HT Columns (fused silica)

low-polarity phase; diphenyl dimethyl polysiloxane

.... The Restek chemists also have developed a stable, reproducible manufacturing process, so that Rxi columns...

Rxi-624Sil MS Columns (fused silica)

midpolarity Crossbond phase

.... The Restek chemists also have developed a stable, reproducible manufacturing process, so that Rxi columns...

Rxi-1HT Columns (fused silica)

nonpolar phase; dimethyl polysiloxane

.... The Restek chemists also have developed a stable, reproducible manufacturing process, so that Rxi columns...

Rxi-17Sil MS Columns (fused silica)

midpolarity Crossbond phase

.... The Restek chemists also have developed a stable, reproducible manufacturing process, so that Rxi columns...

Rxi-5Sil MS Secondary Columns for GCxGC (fused silica)

low-polarity phase; Crossbond 1,4-bis(dimethylsiloxy)phenylene dimethyl polysiloxane

.... The Restek chemists also have developed a stable, reproducible manufacturing process, so that Rxi columns...

Allure AK Columns

...—was developed specifically for the analysis of aldehydes and ketones as DNPH derivatives. Allure AK...

EXP Direct Connect Holder

..., Restek offers the patent-pending guard column hardware developed by Optimize Technologies. A Restek LC...

Force EXP Guard Column Cartridges

..., Restek offers the patent-pending guard column hardware developed by Optimize Technologies. A Restek LC...

Rxi-35Sil MS Columns (fused silica)

midpolarity Crossbond phase

.... The Restek chemists also have developed a stable, reproducible manufacturing process, so that Rxi columns...

Viva Silica Columns (USP L3)

.... In developing Viva silica, we found that although many commercial wide-pore silicas meet the standard 300 Å mean...

Pinnacle II PAH HPLC Columns

...Developed specifically for challenging analyses of polycyclic aromatic hydrocarbons (PAHs...

Rxi-XLB Columns (fused silica)

low-polarity proprietary phase

.... The Restek chemists also have developed a stable, reproducible manufacturing process, so that Rxi columns...

Ultra Carbamate Columns

...Restek chemists developed the Ultra Carbamate column specifically for carbamates analysis...

ETP Electron Multipliers for Mass Spectrometry

....*Note: The electron multipliers have been specifically developed to retrofit the original manufacturer...

EPA Method 525.3 ONP Cal Standard (44 components)

... Developed specifically for EPA Method 525.3. Formulated to provide maximum...

Rxi-5Sil MS Columns (fused silica)

low-polarity phase; Crossbond 1,4-bis(dimethylsiloxy)phenylene dimethyl polysiloxane

.... The Restek chemists also have developed a stable, reproducible manufacturing process, so that Rxi columns...

Viva C18 Columns (USP L1)

.... In developing Viva silica, we found that although many commercial wide-pore silicas meet the standard 300 Å mean...

Raptor EXP Guard Column Cartridges

..., Restek offers the patent-pending guard column hardware developed by Optimize Technologies. A Restek LC...

Rxi-XLB Secondary Columns for GCxGC (fused silica)

low polarity proprietary phase

.... The Restek chemists also have developed a stable, reproducible manufacturing process, so that Rxi columns...

DiatoSorb Diatomaceous Earth Columns (bonded stationary phase packed columns)

..., it was necessary to develop bonded liquid phases for packed columns. Now, packed column chromatographers can expect...

Viva C8 Columns (USP L7)

.... In developing Viva silica, we found that although many commercial wide-pore silicas meet the standard 300 Å mean...

Viva C4 Columns (USP L26)

.... In developing Viva silica, we found that although many commercial wide-pore silicas meet the standard 300 Å mean...

Viva PFP Propyl Columns (USP L43)

.... In developing Viva silica, we found that although many commercial wide-pore silicas meet the standard 300 Å mean...

Viva Biphenyl Columns (USP L11)

.... In developing Viva silica, we found that although many commercial wide-pore silicas meet the standard 300 Å mean...

Method Development SPME Fiber Kit

...Method Development SPME Fiber Kit, Fiber length of 10mm, 23 gauge needle, Includes: 1 PDMS 7um, 1...

SPME Arrow Method Development Kit

...SPME Arrow Method Development Kit, Includes one SPME arrow each: 1.1 mm PDMS 100 µm, 1.5 mm PDMS...

EZGC Calculators and Chromatogram Modeler for GC Method Development

Speed up and simplify your GC method development with Restek's EZGC online suite, featuring our GC flow calculator, GC method translator, and GC chro...

USLC Columns—Ultra Selective Liquid Chromatography

Selectivity is the most influential factor affecting peak separation, or resolution. Restek Ultra Selective Liquid Chromatography (USLC) technology i...

USLC Columns: Choose Columns Fast. Develop Methods Faster. (PDF 1815kB)

...RESTEK USLC Ultra Selective Liquid Chromatography Choose Columns Fast. Develop Methods Faster . Ultra Selective Liquid Chromatography Technology Choose Columns Fast. Develop Methods Faster. What ... , method development, UHPLC, HPLC, USLC, reversed phase...

USLC Columns Put the Right Tools in Your LC Method Development Toolbox (PDF 1474kB)

...General Interest USLC Columns Put the Right Tools in Your LC Method Development Toolbox underutilized parameter. To improve selectivity, method developers often concentrate on manually altering ... , reversed phase, H-S Model, method development, UHPLC, HPLC...

Will Pro EZGC Chromatography Modeling Software Work For You? We Put It to the Test! (PDF 2272kB)

...Method development is hard. As any analyst will tell you, it takes time—and a lot of trial that allowed you to develop optimized GC methods in just a matter of seconds? Restek’s Pro EZGC chromatogram ... gc modeling software, EZGC, method development...

Restek GCxGC Columns for Comprehensive Two-Dimensional Gas Chromatography

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

Speed Up and Simplify GC Method Development with the EZGC Online Software Suite (PDF 2054kB)

...www.restek.com Speed Up and Simplify GC Method Development with the EZGC Online Software Suite • Develop new methods in minutes directly from your desk. • Optimize or modify existing methods reliably...

Method Development and Column Selection: How the FluoroPhenyl Phase Provides the Power of HILIC and Reversed-Phase Modes in One Column (PDF 2146kB)

... part of method development as the quality of critical separations is determined in large part Phenyl columns provide an orthogonal alternative for method development because they incorporate multiple...

Rxi-624Sil MS Columns—Exceptionally Inert, Low Bleed Columns for Volatiles Analysis (PDF 4322kB)

... you are developing methods for residual solvents, analyzing environmental VOCs, or running other , and efficient batch testing is critical for releasing approved products. Whether developing new methods...

The Role of Selectivity in Liquid Chromatography Method Development

... of column selectivity in liquid chromatography method development....

USLC Column Selection & Mobile Phase Adjustment Guide (PDF 1682kB)

...RESTEK USLC Ultra Selective Liquid Chromatography Choose Columns Fast. Develop Methods Faster fast and developing methods faster. Each USLC stationary phase is optimized for a different chemical ... , method development, stationary phase, column selectivity...

USLC Columns Put the Right Tools in Your LC Method Development Toolbox Understanding Selectivity in Reversed Phase Separations – A Simplified Approach to HPLC and UHPLC Column Selection

.... To improve selectivity, method developers often concentrate on manually altering mobile phases, operational , you can drastically speed up HPLC and UHPLC method development by instead focusing on column choice ... , or resolution, so choosing the right column can greatly speed up HPLC and UHPLC method development...

News: New Pro EZGC Chromatogram Modeler Propels Method Development Forward

Restek’s new and improved EZGC chromatogram modeler is just as simple to use as the original software, but it now offers advanced options for selecting phases, changing carrier gases and control parameters, further optimizing results, and much more. The software … Continue reading

ChromaBLOGraphy: Cannabis Residual Solvent Method Development Made Easy with Free Modeling Software

In a typical cannabis testing laboratory, finding time and resources to improve or develop methods can be scarce.  Even in our own applications group, finding time to “quickly” generate data can be a challenge with multiple projects taking place at the same time.  However, there’s a tool that can help make this process more efficient […]

Will Pro EZGC Chromatography Modeling Software Work For You? We Put It to the Test!

...Method development is hard. As any analyst will tell you, it takes time—and a lot of trial that allowed you to develop optimized GC methods in just a matter of seconds? Restek ... When it comes to speeding up method development, Pro EZGC modeling software saves you time ... EZGC, gc modeling software, method development...

Tech Tip: Column Conditioning Ensures Consistent EtG/EtS Results (PDF 402kB)

... column lifetimes. Restek’s chemists have developed a simple, dilute-and-shoot LC-MS/MS method for Et for this critical application. This method was developed and stringently tested on the Raptor EtG/EtS column because...

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

... reproducibility during HILIC method development. Table I shows the column volume for each available dimension , so method development is required to ensure that re-equilibration is adequate and results...

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

... can speed up method development and enhance sample throughput. Using 2.7 and 5 μm columns, traditional , Raptor LC columns provide analysts with the most powerful tools available for fast and efficient method...

Method Development and Column Selection: How the FluoroPhenyl Phase Provides the Power of HILIC and Reversed-Phase Modes in One Column

...Abstract Column selection is an important part of method development as the quality for method development because they incorporate multiple retention mechanisms and can be used in both ... Column selection is an important part of method development as the quality of critical separations are commonly employed, FluoroPhenyl columns provide an orthogonal alternative for method development because...

The Role of Selectivity in Liquid Chromatography Method Development (PDF 1332kB)

... Method Development Dr. Schug is an Associate Professor and Shimadzu Distinguished Professor...

News: The Analytical Scientist Innovation Awards (TASIAs) Honor Restek’s EZGC® Method Development Tools

The Analytical Scientist (www.theanalyticalscientist.com) just published their 2014 Innovation Awards, and Restek’s EZGC® method development tools suite was chosen as a winner! These ground-breaking tools allow any analyst, regardless of experience level, to speed up and simplify their GC method … Continue reading

News: Speed Up and Simplify GC Method Development With Restek’s EZGC® Online Suite

Whether you are developing a new GC method or looking to reliably optimize an application, Restek’s EZGC® method development tools will save you hours of calculations, guesswork, and trial-and-error. These free, web-based applications are easily accessible by visiting www.restek.com/ezgc — … Continue reading

News: Leveraging Selectivity and Efficiency to Take the Strain Out of LC–UV Method Development for Cannabinoid Profiling

Author(s): Justin Steimling Restek Corporation Published By: Cannabis Science and Technology Issue: Volume 1, Issue 4 Year of Publication: 2018 Link: http://www.cannabissciencetech.com/article/leveraging-selectivity-and-efficiency-take-strain-out-lc%E2%80%93uv-method-development-cannabinoid Abstract: More than 100 cannabinoids have been isolated from cannabis in addition to the five most commonly tested: ∆9-tetrahydrocannabinol (∆9-THC), ∆9-tetrahydrocannabinolic acid (THCA), … Continue reading

News: Cut GC Method Development and Optimization Time with EZGC Web Tools: Software Solutions to Hard Problems

Free Separation Science Webinar Presenter: Jonathan Keim, Restek Date: December 5, 2017 Time: 8 a.m. PST / 11 a.m. EST / 4 p.m. GMT / 5 p.m. CET A recorded, on-demand version will be available to everyone who registers for … Continue reading

News: Now Online! The Restek EZGC™ Chromatogram Modeler Will Kick-Start Your GC Method Development

A revolutionary new version of Restek’s popular EZGC™ application is now live—it’s easier to use and it’s absolutely free. Just enter your compounds, and this cutting-edge system will recommend not only a GC column, but also the conditions to reliably … Continue reading

News: Method Development and Column Selection: How the FluoroPhenyl Phase Provides the Power of HILIC and Reversed-Phase Modes in One Column

Author: Sharon Lupo, Frances Carroll Restek Corporation Published By: Restek Corporation Year of Publication: 2017 Link: http://www.restek.com/Technical-Resources/Technical-Library/General-Interest/gen_GNAR2613 Abstract: Column selection is an important part of method development, as the quality of critical separations is determined in large part by the retention and selectivity of … Continue reading

Reliable HILIC LC-MS/MS Analysis of 4-Methylimidazole (4-MEI) on Raptor FluoroPhenyl Columns (PDF 1191kB)

... also be used in reversed-phase mode for other analyses, giving method developers the flexibility to humans [1]. This designation has generated interest in analytical methods that can be used to determine...

Restek Advantage, 2011.1 (PDF 3826kB)

... resolution.One of the most significant challenges in method development is finding the proper stationary 18), rather than significantdifferences in selectivity. Method development is less laborious and time...

Restek Advantage, 2012.1 (PDF 14846kB)

... development—and the new USLC toolbox makes things even easier! A USLC method development toolbox contains or 5 μm) in 50, 100, or 150 mm lengths, this must-have companion for method developers also includes...

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

..., medical marijuana pesticide residue analysis methods are poorly defined and challenging to develop due were detected in some of the illicit marijuana samples used for method development. Qu...

How Column Inertness Improves the Chromatography of Basic Compounds (PDF 960kB)

... be attributed to column inertness and result in faster,more reliable method development.Balanced Deactivations ,researcherscan develop methods faster by using columns with a balanced Rxi deactivation.ConclusionWhen it comes to peak...

Resprep PPT 96-Well Plate Instruction Sheet (PDF 632kB)

... time and speed may need to be optimized during method development if you experience cloudiness methods below. a. Vacuum manifold: 2–9 inches Hg for 5 min or until filtration is complete. b. Positive...

Increase Data Quality for Sulfonamide Antibiotics Analysis by HPLC and UHPLC (PDF 975kB)

... to the column’s unique selectivity and high retention, we were able to develop a very effective HPLC separation residue analysis. First, the separation can be easily transferred from UV to MS without further method...

Reliable Low-Level Analysis of Glycols in Water Using Split Injection (PDF 767kB)

...-term method development study that consistently produce good chromatographic results at low levels. We also below. Over the course of a comprehensive, in-house method development study, these conditions were...

Restek Reference Standards (PDF 4407kB)

... | www.restek.com/LC LC Accessories | www.restek.com/LCacc Technical Resources EZGC Method Development troubleshooting, method development, and more. For fast, personalized, and thorough answers to your most...

Restek PAL SPME Fibers Instruction Sheet (PDF 254kB)

...) Dark Gray Gray 27873.1 27873.3 27873.5 Method Development Fiber Kit (Set of 5; includes one fiber...

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

... on the market. When developing methods for these compounds, optimization of analysis time, resolution between developing a simple dilute-and-shoot method that included both synthetic cannabinoids and their metabolites...

Featured Application: LC Analysis of 4-MEI on Raptor FluoroPhenyl Columns Reliable HILIC LC-MS/MS Analysis of 4-Methylimidazole (4-MEI) on Raptor FluoroPhenyl Columns

...-phase mode for other analyses, giving method developers the flexibility to use the column in both modes generated interest in analytical methods that can be used to determine 4-MEI levels in both the colorings ... Raptor FluoroPhenyl columns perform well in both HILIC and reversed phase modes, giving method developers the flexibility to select the mode that performs best for their specific compounds of interest...

ChromaBLOGraphy: Using the Restek EZGC Method Translator and Flow Calculator to Support Shoot-and-Dilute GC Method Development – Going from GC-ECD to GC-MS

Hopefully some of you are following the Shoot-and-Dilute GC work (split injection) we’ve been doing in our lab, as it offers a way to keep your GC systems up longer by reducing the impact of dirty samples on inlet liner and column integrity.  After giving a lecture on the technique at the recent European Pesticide […]

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

..., and detectors. • Secondary columns come in convenient 2 m lengths for economical method development. Restek , sediments, air, water, and other matrices. He uses his years of real-world experience in method development...

News: EZGC Online Tools Now in Multiple Languages

GC method development just got easier for scientists all around the globe. Restek’s EZGC online method development tools are now available in English, Portuguese, Spanish, French, Italian, Dutch, German, Japanese, and Chinese languages. No matter where you are in the … Continue reading

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

..., we developed a simplified method for methylmalonic acid analysis. The approach shown here uses chromatographic analysis time makes this method suitable as a high-throughput assay for the clinical diagnosis ... significant time and expense. The LC-MS/MS method developed here offers a much simpler alternative, providing as well as methylmalonic acidemia. Methods typically require extensive sample preparation, which involves...

Whole Air Canister Sampling and Preconcentration GC-MS Analysis for pptv Levels of Trimethylsilanol in Semiconductor Cleanroom Air

... in the semiconductor industry. A whole air canister-based method has been developed for TMS at trace levels (i.e., pptv has resulted in the demand for accurate and reliable methods for measuring TMS at trace levels (i ... -level methods in the semiconductor industry. The whole air canister-based GC-MS method developed here couples...

Faster Detailed Hydrocarbon Analysis (DHA) Using Hydrogen (PDF 464kB)

..., 2011 and was one of the original DHA method developers) to engineer a selective and highly inert DHA for evaluating raw materials and controlling refinery processes. A high-resolution GC method for detailed...

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

... to be tested. Labs can begin method development with the FDA Pesticide Analytical Manual (PAM), which includes , and the inability to extract polar pesticides. As an alternative, we developed a QuEChERS-based method...

Featured Application: Mycotoxins in Peanut Powder on Raptor Biphenyl 5.5 Minute LC-MS/MS Analysis of Mycotoxins
in Peanut Powder

... highly efficient screening, it is very challenging to develop such a method due to differences developed the following LC-MS/MS method that resolves 12 FDA regulated mycotoxins within the pressure limits ... The method developed here provides a fast analysis of mycotoxins in peanut powder. Baseline time). This method can be applied to different matrices using either matrix-matched calibration...

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

...-XLB, and Stabilwax column. • Comprehensive kit simplifies column selection for method developers and frequent GCx...

QuEChERS Sample Preparation Procedures (PDF 2089kB)

... during method development for your specific analytes and sample matrices. Stage 2: Sample cleanup (cleanup). They include a general overview of the stages, as well as method-specific information for each...

Restek PAL SPME Arrow Instruction Sheet (PDF 307kB)

.../Carbon WR/PDMS 120 1.5 Dark Gray 27876 Method Development Kit (Set of five; includes one of each type...

Separating NSAIDs through Aromatic Selectivity Improve Retention by Using An Allure Biphenyl HPLC Column

... to conventional phase columns, especially in method development . Increasing the organic content, in turn, increases sensitivity in LC/MS methods, because it optimizes ... to conventional phenyl phase columns, especially in method development....

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

....restek.com/vials Turn to Restek’s Tech Experts to Easily Select the Consumables You Need Perform GC Method Development solution for your GC method development challenges. YOU NEED: To perform GC method development from...

A Fast Dilute-And-Shoot Method for Simultaneous 5-Hydroxyindoleacetic Acid (5-HIAA), Vanillylmandelic Acid (VMA), and Homovanillic Acid (HVA) LC-MS/MS Analysis in Human Urine (PDF 631kB)

... and chromatographic analysis times of up to 16 minutes. The development of a faster and simpler method would greatly To develop a quantitative dilute-and-shoot method, it is important to ensure chromatographic separation...

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)

... and Munch's paper on the development of the Method 522 [2] and average recoveries of 1,4-dioxane in the mid in recoveries that were within the expected range (Table II) and that matched published method development data...

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

.... Advantages of methods developed based on QuEChERS and GC-TOFMS may include rapid sample screening prior to QuEChERS extraction.Originally the QuEChERS method was developed for high aqueous content...

News: The New USLC® Toolbox Gives You All the Right Tools—All in One Box

Restek’s USLC® column set represents the widest range of reversed phase selectivity available with just 4 stationary phases: Aqueous C18, IBD, Biphenyl, and PFP Propyl. It simplifies column choice for fast, effective method development—and new USLC® toolboxes make things even … Continue reading

4.5 Minute Analysis of Benzodiazepines in Urine and Whole Blood Using LC/MS/MS and an Ultra Biphenyl Column (PDF 672kB)

... The method developed here allows for fast analysis of a comprehensive list of benzodiazepines , and nordiazepam) were not quantitated in the urine samples. However, data collected during method development...

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

... and 2015. The mandated method for 1,4-dioxane analysis is EPA 522, which was developed for part in Grimmett and Munch’s paper on the development of EPA Method 522 [1]. The cartridge is meant for samples...

Rxi GC Columns Sales Sheet (PDF 3173kB)

..., and detectors. • Secondary columns come in convenient 2 m lengths for economical methods development. Restek -XLB, and Stabilwax column. • Comprehensive kit simplifies column selection for method developers and frequent GCx...

The Effects of LC Particle Choice on Column Performance: Switching from 3 and 5 µm Fully Porous Particles (FPP) to 5 µm Superficially Porous Particles (SPP) (PDF 559kB)

... improving efficiency and sensitivity. Certain assays may require some degree of method development by performing an assay using identical instrumentation and isocratic method conditions (Figure 4...

Set Your Sights on Superior Performance with Restek PAL SPME Arrow (PDF 2188kB)

... and semivolatile, 40–275 g/mol* ea. 27876 SPME Arrow Method Development Kit Set of 5 27489 On Target: Longer 120 sec www.restek.com 5 On Target: Lower Detection Limits Developing a new method or trying...

Get Equivalent GC-MS Results Faster with Restek’s GC Accelerator Kit and EZGC Method Translator (PDF 1618kB)

...—in a fraction of the time without making a capital investment. Speed Up and Simplify GC Method Development and adapting an existing method to a scaled-down, more efficient column using our EZGC method translator...

Definitive EtG/EtS LC-MS/MS Analysis: A Rugged 4-min Method for High-Throughput Labs (PDF 631kB)

... throughput, and short column lifetimes. In this study, a simple dilute-and-shoot method was developed was established here during method development, clinical labs adopting the method can be confident that matrix...

High-Performing Restek PAL SPME Fibers (PDF 3267kB)

....1 27873.3 27873.5 Description cat.# Method Development SPME Fiber Kit Includes one SPME fiber each...

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

....1 mm Amines and polar compounds, 60–300 g/mol* ea. 27486 SPME Arrow Method Development Kit Set of 5 Your Lab’s Throughput Using scaled-down Rxi columns, the EZGC method translator, and the GC...

Rapid Analysis of 17 Bile Acids in Human Plasma by LC-MS/MS (PDF 767kB)

... minimum resolution of isomers. In this study, a simple UHPLC method was developed for the simultaneous was observed during method development. It was greatly reduced by extending the gradient and increasing...

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

News: Single-Compound Standards from Restek Improve the Analysis of Difficult Pesticides

Troublesome pesticides can be analyzed more easily and accurately with single-compound standards from Restek. New individual standards are now available for dicofol, metribuzin, bromacil, lenacil, dodine, anilazine, captan, and folpet. Use these standards to simplify method development, establish instrument detection … Continue reading

Raptor C18 LC Columns Brochure (PDF 2375kB)

... developing an assay, it is important to consider how productive your method will be. Because superficially -shell particles, the Raptor C18 column lets you quickly develop faster methods, thereby boosting your...

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

... is inexpensive, readily available, and a common PCI gas [17]. The method we developed here is subject activated charcoal, was described in the papers on the development of EPA Methods 521 and 522 [1, 8...

News: Separation Science Asia 2014 to Feature Restek Talks on Carrier Gas Choice and GC Injection Techniques

Separation Science Asia 2014 takes place in Biopolis, Singapore, on November 19 and 20. This year’s scientific program features a new format that will focus on comprehensive, tutorial-style presentations covering a combination of best practices, troubleshooting, and method development. Joining … Continue reading

News: Will Pro EZGC Chromatography Modeling Software Work For You? We Put It to the Test!

Published By: Restek Corporation Year of Publication: 2017 Link: http://www.restek.com/Technical-Resources/Technical-Library/General-Interest/general_GNAR2714-UNV Abstract: When it comes to speeding up method development, Pro EZGC modeling software saves you time, materials, and a lot of frustration. This technical article puts Restek’s GC chromatogram simulator to the … Continue reading

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 […]

Method Evaluation: Analysis of Phosphatidylethanol (PEth) in Human Whole Blood by LC-MS/MS (PDF 874kB)

... (USP L43) Conclusion The method developed here for the analysis of phosphatidylethanol using a Raptor Method Evaluation: Analysis of Phosphatidylethanol (PEth) in Human Whole Blood by LC...

Half the Column, Same Chromatogram: Maintain Resolution of BDE 49 and BDE 71 With Proper Method Translation After Trimming an Rtx-1614 Column (PDF 4793kB)

... EZGC methods development software from Restek Corporation (cat.# 21487). This thermodynamic modeling Half the Column, Same Chromatogram: Maintain Resolution of BDE 49 and BDE 71 With Proper Method...

ChromaBLOGraphy: Medical Cannabis Terpenes Standards now available from Restek!

As many of you dedicated ChromaBLOGraphy readers know, Restek has supported the medical marijuana market for years with reference materials, and GC and LC consumables.  We find the field fascinating, so much so that we try to anticipate the upcoming needs of medical cannabis analysts through method development for compounds in addition to cannabinoids that […]

ChromaBLOGraphy: ezGC really IS cool!

My officemate, Michelle, was working on a volatiles analysis using method development software called Pro ezGC. Typically, I try to optimize methods by spending time in the lab running variations on a method. At the time, I was analyzing fragrance allergens, trying to achieve resolution but keep my analysis time similar to a published IFRA [...]

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 […]

News: 5.5 Minute LC-MS/MS Analysis of Mycotoxins in Peanut Powder

Published By: Restek Corporation Year of Publication: 2018 Link: https://www.restek.com/Technical-Resources/Technical-Library/Foods-Flavors-Fragrances/fff_FFSS2971-UNV Abstract:The method developed here provides a fast analysis of mycotoxins in peanut powder. Baseline separation of 12 FDA and EU regulated mycotoxins was achieved in a 5.5 minute analysis (7 minute total cycle … Continue reading

ChromaBLOGraphy: Feeling Lost in a Sea of C18s? Try the New USP Column Comparison Tool

With well over 500 available, it is easy to become overwhelmed when selecting a C18 column. Many chromatographers stick with what they know, and use the same C18’s for all method development work. I have certainly been guilty of this! However, very few C18 columns are exactly alike. With a wide range of physical properties [...]

Column Choice: A Critical Factor for Successful UHPLC Integration

... for analytical method development in the pharmaceutical laboratory. Higher productivity can be realized face is seamlessly integrating methods developed using UHPLC into pharmaceutical labs, which are still ... Column choice is a critical factor in successfully transferring methods between UHPLC and HPLC...

Analysis of Nicotine and Impurities in Electronic Cigarette Solutions and Vapor (PDF 862kB)

... GC mass spectrometry (GC-MS) method was developed for the determination of impurities in e . To that end, this study included development of analytical methods for both solution and vapor samples. All...

News: The Practical Chemist: Easy Ways to Generate Scientifically Sound Data

Author: Amanda Rigdon Restek Corporation Published By: Cannabis Industry Journal Year of Publication: 2016 Link: https://www.cannabisindustryjournal.com/column/easy-ways-to-generate-scientifically-sound-data/ Abstract: The inaugural installment of a new column that will provide simple ways for laboratories to improve the quality of their chromatographic data, including … Continue reading

Stabilwax-MS Columns—Thermally Stable, High Polarity GC Columns for Flavor, Food, Fragrance, Industrial Chemical, and Solvent Analyses (PDF 2473kB)

... settings, or save them for future reference. Start developing incredible GC methods today! Now Online ! Our EZGC Web App Will Kick-Start Your GC Method Development www.restek.com/ezgc 11 Butt...

News: The (not so) EZ Journey to Improved GC Methods

Author(s): Chris Nelson, Jaap de Zeeuw, Jack Cochran, and Chris English Restek Corporation Published By: The Analytical Scientist Issue: #0615 (Article #501) Year of Publication: 2015 Link: https://theanalyticalscientist.com/issues/0615/the-not-so-ez-journey-to-improved-gc-methods/ Abstract: In this article for The Analytical Scientist, we explore the complex roots that … Continue reading

Tech Tip: Column Conditioning Ensures Consistent EtG/EtS Results

..., and short column lifetimes. Restek’s chemists have developed a simple, dilute-and-shoot LC-MS/MS method developed specifically for this critical application. This method was developed and stringently tested ... Methods for monitoring alcohol consumption biomarkers EtG and EtS are generally limited by poor lifetimes. The dilute-and-shoot EtG/EtS LC-MS/MS analysis developed here using the novel Raptor Et...

ChromaBLOGraphy: Residual Solvents in Cannabis…and Terpenes with Simon & Garfunkel

In my last blog post, I wrote about our ongoing method development for residual solvents in cannabis. We’ve been really busy since then, and now we have a complete application note published on this subject. Because we can’t legally get our hands on real cannabis concentrates here in Pennsylvania, the application note proves our concept […]

Force LC Columns Brochure (PDF 4515kB)

... Reproducibility Once you set up and validate a workflow, you move on to developing the next new method. You don develop methods on fast UHPLC instruments using sub-2 μm particle columns. But, the methods must...

Force LC Columns Sales Sheet (PDF 3547kB)

..., analysts will often develop methods on fast UHPLC instruments using sub-2 μm particle columns. But retention of hydrophobic compounds. Figure 7: A C18 is a common first choice for method developers...

Novel Column Chemistry—High Impact, Low Cost Technology

..., creating a versatility needed in method development. The selectivity, or peak separation, of a C18 is often in the pharmaceutical laboratory is commonly used to accelerate development of methods which are then scaled ... to optimized and more reliable methods—giving a fast return on a minimal investment....

Analysis of Brominated Flame Retardants by Liquid Chromatography Mass Spectrometry

... remain in LC-MS methods development. LC-MS continues to be susceptible to matrix effects generations of BFRs. A new challenge in the evolution of LC-MS methods for BFRs is the development...

1s 5s & Waxes

1's 5's & Waxes

ChromaBLOGraphy: Accurate Quantification of Cannabinoid Acids and Neutrals by GC – Derivatives without Calculus

Derivatization is a widely-used technique for GC sample preparation across many industries and in widely varied matrices from soil to plastics to blood that is used to make polar and active compounds more amenable to good GC analysis. If you’re careful about testing your derivatization procedure during method development, you can be confident that you’ll […]

News: Understanding Selectivity in Reversed Phase Separations – A Simplified Approach to HPLC and UHPLC Column Selection

Author(s): Rick Lake, Ty Kahler Published By: Restek Corporation Year of Publication: 2011 Link: http://www.restek.com/Technical-Resources/Technical-Library/Pharmaceutical/general_PHAN1348 Abstract: Column selectivity has the most significant influence on chromatographic peak separation, or resolution, so choosing the right column can greatly speed up HPLC and UHPLC method … Continue reading

News: Simplified Methylmalonic Acid Analysis without Derivatization in Human Plasma by LC-MS/MS

Published By: Restek Corporation Year of Publication: 2018 Link: http://www.restek.com/Technical-Resources/Technical-Library/Clinical-Forensic-Toxicology/cft_CFSS2829A-UNV Abstract:  Methylmalonic acid analysis is an important clinical test for diagnosing vitamin B12 deficiency as well as methylmalonic acidemia. Methods typically require extensive sample preparation, which involves significant time and expense. The LC-MS/MS … Continue reading

How to Avoid Common Problems with HILIC Methods

... to establish a good starting point, but re-equilibration time is analyte dependent, so method development . In fact, method development and evaluation are most important in this area because the effect of p ... Whether you’ve run HILIC methods before or are attempting to for the first time , there are significant differences between reversed-phase and HILIC methods that must be considered. This article...

Analysis of Synthetic Cannabinoids and Metabolites: Adding New Compounds to an Existing LC-MS/MS Method

... laboratories as new drugs appear on the market. When developing methods for these compounds, optimization USLC technology, we chose it when developing a simple dilute-and-shoot method that included both ... column allows new drugs to be added to an existing method, providing labs with an important vehicle...

Tech Tip — Why do I Lose Retention on my C18 in Highly Aqueous Mobile Phases?

... is not a universal solution, as it can also cause method problems such as lower efficiency, longer equilibration bonding, which ultimately extends the range of compounds that can be analyzed. Beginning method...

ChromaBLOGraphy: Selectivity and the HPLC Mobile Phase

Stationary phase (i.e. column type) is a key contributor to selectivity in LC. But what about the mobile phase? A significant advantage, and sometimes challenge, in LC is that both the stationary and mobile phase chemistries can be modified to optimize our method. This contrasts with GC, where the main selectivity option is the stationary [...]

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 [...]

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 […]

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

Raptor SPP Core-Shell LC Columns

Raptor SPP LC columns offer higher efficiency for drastically faster analysis times, better selectivity for substantially improved resolution, increa...

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

... the UNITY method development mode to analyse dried foodstuffs Typical TD-GC analytical conditions: Typical for environmental air monitoring and occupational health & safety. Relevant standard methods include: ISO/EN 16017...

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: Pyrethrins CRM Added to Restek Single-Compound Standards List for Improved Analysis of Difficult Pesticides

Troublesome pesticides can be analyzed more easily and accurately with single-compound standards from Restek. We’ve just added a new pyrethrins CRM to our inventory, so individual reference standards are now available for dicofol, metribuzin, bromacil, lenacil, dodine, anilazine, captan, folpet, … Continue reading

ChromaBLOGraphy: Which LC Phase Do I Need?

So you’re thinking about doing HPLC (or UHPLC) and don’t have a method? You’ve never even seen a method for anything remotely similar. You might have even searched our HPLC chromatogram database for the application and haven’t found anything.  (After all, that’s the quickest and easiest way to get some ideas.) What to do… Let’s [...]

ChromaBLOGraphy: Restek’s EZGC Online Suite that includes the Method Translator and Flow Calculator, and a Chromatogram Modeler, wins a TASIA Award – Chris Nelson, One of the Suite Builders

The Analytical Scientist is a very smartly produced scientific magazine full of interesting articles, including many on chromatography.  I’ve had the pleasure of working with two of the minds behind this publication, Rich Whitworth and Frank van Geel, on a TAS GCxGC contribution, and have been impressed with the volume of quality work they’ve put […]

ChromaBLOGraphy: EZGC Made Even Easier – Free web version now available!

A few of my colleagues, Julie Kowalski and Chris English, have written blogs about the original CD based Pro ezGC modeling software (ezGC really IS cool! and Pro ezGC Software: Manna from Heaven or a Clunky DOS-Based Program).  The basics of this software is to add a library of compounds by entering the retention times [...]

How do intrinsically base-deactivated phases work?

...  Ultra IBD offers more flexibility in method development giving excellent peak shape for highly basic...

ChromaBLOGraphy: LC-MS/MS the Future of New Pesticide Analysis According to Speakers at FPRW

Two representatives from companies who make crop protection/science chemicals (pesticides, etc.) spoke at the Florida Pesticide Residue Workshop this week.  Tom Gould of Bayer Crop Science gave the presentation Conversion of Three Old Style Analytical Methods to LC/MS-MS Technology Utilizing Isotopic Internal Standards and Jim Stry of DuPont Crop Protection talked on Trends in Residue [...]

News: Restek at Pittcon 2015: Free Starbucks and 30 Years of Pure Chromatography

What better place than The Big Easy to throw a party? And what better excuse than our 30th anniversary? We have your invitation to innovation, and there’s no RSVP needed. Just stop by Booth #2600 to join in the fun! … Continue reading

News: Liquid Chromatography’s Complementary Role to Gas Chromatography in Cannabis Testing

Authors: Justin Steimling, Ty Kahler Restek Corporation Published By: Supplement to LCGC North America Year of Publication:  June 2018 Volume, Number: Volume 36, Number s6 Link: http://files.pharmtech.com/alfresco_images/pharma/2018/06/13/f119cb54-ce43-4628-95f8-af1aa07bb6ff/LCGC_NAmerica_June2018Supp.pdf Abstract: The absence of consensus methods for cannabis testing is a challenging, but refreshing opportunity for … Continue reading

News: Quickly and Efficiently Extract Both Volatiles and Semivolatiles with New Triple-Phase SPME Fibers and Arrows

Restek first launched solid phase microextraction (SPME) automated sample preparation fibers to reduce sample handling and solvent consumption in many industries, such as environmental, food, and clinical. Soon after came rugged Restek PAL SPME Arrows, a revolution in microextraction that … Continue reading

ChromaBLOGraphy: See how the PFAS Delay Column works! Psst.. Do not delay your action, and take a look at this now.

Per- and polyfluorinated alkyl substances (PFAS) analysis usually requires very low level detection (parts per trillion level) in drinking water. The most common problem we run into is that PFAS are everywhere, including our lab and the very instrument (LC-MS/MS) we use to detect those compounds, so having system-related background interference is very common. There […]

Res-Sil C Bonded GC Packings for Analyses of Light Hydrocarbons

..., the unique selectivity of the OPN on Res-Sil C column provides petroleum and petrochemical method developers in availability. Our synthesis chemist developed a material to replace the Durapak materials, and Restek has...

Analyze Hydrocarbons on OPN/Res-Sil C Bonded GC Packing Superior Replacement for Porasil Packings

..., this unique material provides petroleum and petrochemical method developers with a powerful tool for fast chemists solved the problem by developing Res-Sil C and Res-Sil B bonded...

Storage Stability of 66 Volatile Organic Compounds (VOCs) in Silicon-Lined Air Canisters for 30 Days (PDF 795kB)

... Research Triangle Park, NC. 13. T.J. Kelly, P.J. Callahan, J. Pleil, G.F. Evans, Method development .S.) Environmental Protection Agency’s (EPA’s) Compendium Method TO-15, were evaluated for two commercially available...

Diagnosing and Preventing High Back Pressure Problems in LC Systems (PDF 5850kB)

... sample packs available. Use these handy packs for method development or to compare with your current offers the patent-pending guard column hardware developed by Optimize Technologies. A Restek LC guard...

Restek LC Columns and Accessories (PDF 17555kB)

... information about Restek products, applications, instrument troubleshooting, method development, and more technology for fast, efficient method development that delivers: • Drastically faster analysis times...

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

... for the development of quick, easy, and affordable sample preparation methods without capital investment in extraction equipment. The friendly experts at Restek are always willing to help with method development...

ChromaBLOGraphy: Restek at Arab lab 2012

From march 26-29  Arab lab exposition  was organized in Dubai. The show attracted many international visitors from countries in middle east and was a great platform to discuss analytical challenges. Restek was showing their solutions on GC and LC and products were displayed as part of the Shimadzu booth, see picture1. Besides petroleum related innovations, [...]

ChromaBLOGraphy: Jack Henion gives opening plenary talk at Isranalytica 2014

In the continuing tradition of having excellent international speakers, Isranalytica 2014  had Jack Henion open the conference with his plenary lecture, “Liquid Chromatography – Mass Spectrometry: Applications Ranging from the Complex to the Very Simple”.  (I was lucky enough to see Graham Cooks at Isranalytica in 2008.)  Jack is well known for his work 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 […]

Enviro

YOUR GUIDE FOR Environmental Sampling and Analysis

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

... derived from botanical sources. As a result, labs are working to develop and validate methods, an endeavor to extract polar pesticides. As an alternative, we developed a QuEChERS-based method for analyzing pesticides ... Restek has developed the first QuEChERS-based method for determining pesticide residues in dietary...

ChromaBLOGraphy: What is Different about Prep LC? (Versus Analytical HPLC)

  The goal of prep LC is not to produce the best looking chromatogram. Prep LC can be used to purify a material for manufacturing or research purposes, or it can also be used for sample cleanup prior to analytical measurement, such as in gel permeation chromatography. Most Restek customers are more involved with using […]

ChromaBLOGraphy: The Raptor Biphenyl blows away a conventional C18 in this gunpowder assay

A very enjoyable aspect of my position within Restek is the opportunity to work with an experienced and interesting network of chromatographers throughout Europe. This includes the talented scientists at ALSAC in Uppsala, Sweden, who recently evaluated a Raptor Biphenyl column in a customer assay of gunpowder materials. ALSAC (Addtech Life Science Applications Center) has […]

News: New Raptor™ ARC-18 Columns Are Born for LC-MS/MS

The birth of Restek’s new Raptor™ SPP LC column line began with the innovative Biphenyl phase, and it has now grown to include a new Restek® phase: the ARC-18. Designed and intended specifically for use on LC-MS/MS systems, the Raptor™ … Continue reading

News: Raptor™ Speed, Efficiency, and Ruggedness is Now Available in C18

Every LC lab has a cache of C18s, but every C18 is not created equal. Because the chemistry tends to be similar, the silica support that carries this ubiquitous octadecylsilane phase becomes vitally important. When you need a general-purpose LC … Continue reading

News: Restek Unleashes Superior Raptor Performance on Your UHPLC Analyses — Now with 1.8 μm Particles

Raptor LC columns have been providing higher efficiencies, faster analyses, and rock-solid reliability to HPLC users for several years. And they have just evolved again. Restek has brought the benefits of Raptor columns to those who have made the leap … Continue reading

News: Join Restek at the Forensic Science Symposium Offered by Shimadzu

Wednesday, August 22, 2018, Shimadzu, 7100 Riverwood Drive, Columbia, MD 21046 Join Restek for a day of science at Shimadzu’s upcoming Forensic Science Symposium. This event will consist of scientific talks from collaborators at a crime laboratory, police department, medical … Continue reading

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

.... The optimized method developed here shows superior sensitivity for the ESA and OA degradates . Chromatographic resolution of alachlor ESA and acetochlor ESA isomers. Meet method ... An optimized EPA Method 535 procedure offers superior sensitivity for the ethanesulfonic acid (ESA line of Method 535 products, including reference standards, solid phase extraction cartridges, and HPLC...

Increase Data Quality for Sulfonamide Residue Analysis by HPLC and UHPLC Using Unique Biphenyl Column Selectivity

... without further method development. Second, the use of simple mobile phases saves time and money, since , for this work. Due to the column’s unique selectivity and high retention, we were able to develop a very...

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...

Faster Detailed Hydrocarbon Analysis (DHA) Using Hydrogen

..., 2011 and was one of the original DHA method developers) to engineer a selective and highly inert DHA method requirements. More than 50% faster analysis (C13 retention time ...

ChromaBLOGraphy: How can I test for 4-Methylcyclohexane methanol?

On January 9th, approximately 5000 gallons of 4-Methylcyclohexane methanol (MCHM) seeped from a storage tank into the Elk River in southern West Virginia.  Eventually, the MCHM  (CAS #34885-03-5) made its way into the water supply prompting Governor Tomblin and President Obama to issue a state of emergency for the affected counties.  The story can be […]

ChromaBLOGraphy: SPME Fundamentals: A Look into Incubation and Extraction Temperatures

Being fairly new to anything comes with some good lessons learned. My recent foray into Solid Phase Microextraction (SPME) has been a lot of fun, but I’d be lying if I said it has not been frustrating, complete with some face-palming moments.     In this series, we are going to take you on a […]

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

.... Zhang is a Chemist in the Methods Development Branch of the US FDA Center for Food Safety and Applied it would be impractical to develop individual analytical methods for every pesticide in suspected food...

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

... residue analysis methods are poorly defined and challenging to develop due to matrix complexity and a long in some of the illicit marijuana samples used for method development. QuEChERS Extraction Saves...

News: Restek Bolsters its Product Expertise With Two New Hires

Restek recently expanded its marketing department by bringing on two new Product Marketing Managers: Paul Connolly (LC Columns) and Scott Adams (GC Accessories). Paul and Scott will manage day-to-day operations and product maintenance while former PMMs Rick Lake and Kelli … Continue reading

Reliable Low-Level Analysis of Glycols in Water Using Split Injection

... a long-term method development study that consistently produce good chromatographic results at low levels of a comprehensive, in-house method development study, these conditions were determined to reliably provide ... retention times. The split injection method shown here avoids these problems and reliably produces good...

ChromaBLOGraphy: Restek Proudly Supports Young Scientists at Germany’s 28th Annual Separation Science Working Group’s PhD Student Conference

Helping young scientists grow into the chromatographic industry’s next generation of innovators and leaders is an opportunity we relish at Restek. For a company dedicated to the science of separation, it is invigorating to see the work of aspiring chromatographers, and there is no better place to see that than the annual PhD Student Conference […]

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