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Chromatography Columns > GC Columns

Browse our complete line of GC Columns

Viva Guard Cartridges

... of the stationary phase in this guard cartridge, see the product page for an analytical column with the same silica and stationary phase (e.g., Viva C18)....

Allure Guard Cartridges

... of the stationary phase in this guard cartridge, see the product page for an analytical column with the same silica and stationary phase (e.g., Allure AK)....

Ultra Guard Cartridges

... of the stationary phase in this guard cartridge, see the product page for an analytical column with the same silica and stationary phase (e.g., Ultra C18)....

Pinnacle DB Guard Cartridges

... of the stationary phase in this guard cartridge, see the product page for an analytical column with the same silica and stationary phase (e.g., Pinnacle DB C18)....

Rt-2560 Column (fused silica)

highly polar phase; biscyanopropyl polysiloxanenot bonded

...Because the Rt-2560 stationary phase is not bonded, it should not be solvent rinsed ... Stationary phase selectivity optimized for isomer separation to ensure accurate...

Stabilwax-MS Columns (fused silica)

... cycling. When methods require trace analysis, this highly polar, low-bleed stationary phase produces ... High-polarity, stable polyethylene glycol (PEG) stationary phase. Low bleed °C to 250/260 °C. Equivalent to USP G14, G15, G16, G20, and G39 phases. ...

Rtx-2887 Column (fused silica)

nonpolar phase; Crossbond 100% dimethyl polysiloxanefor simulated distillation

...The Rtx-2887 column's stationary phase, column dimensions, and film thickness have been times. The Crossbond methyl silicone stationary phase has increased stability compared to packed columns...

Ultra Silica HPLC Prep Columns

... on a 5 μm spherical silica. Other stationary phases are also available—please call and inquire . Base-deactivated spherical silica is useful for normal-phase or HILIC separations.Stationary ... Our broadest selection of stationary phases, including unique phases. High-density bondings...

Rt-βDEXcst Columns (fused silica)

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

...By adding β or γ cyclodextrin to our bonded Rtx-1701 stationary phase, we greatly enhance cyclodextrin stationary phases. Separations of more than one hundred chiral compounds have been achieved using ... Uses: Proprietary stationary phase, developed specifically for the fragrance industry. Also...

Ultra C8 HPLC Prep Columns

... on a 5 μm spherical silica. Other stationary phases are also available—please call and inquire Easy scale-up from Restek analytical columns. Popular bonded phases ... Our broadest selection of stationary phases, including unique phases. High-density bondings...

Ultra Cyano HPLC Prep Columns

... on a 5 μm spherical silica. Other stationary phases are also available—please call and inquire of protonated bases.Stationary Phase Category: cyano (L10)Ligand Type: cyanopropylsilane ... Our broadest selection of stationary phases, including unique phases. High-density bondings...

Ultra PFP Propyl Prep Columns

... on a 5 μm spherical silica. Other stationary phases are also available—please call and inquire .Stationary Phase Category: fluorophenyl propyl (L43)Ligand Type: pentafluorophenyl propylParticle ... Our broadest selection of stationary phases, including unique phases. High-density bondings...

Ultra IBD HPLC Prep Columns

... on a 5 μm spherical silica. Other stationary phases are also available—please call and inquire compounds in highly organic mobile phases.Stationary Phase Category: polar-embedded alkyl (L68 ... Our broadest selection of stationary phases, including unique phases. High-density bondings...

Ultra Biphenyl Prep Columns

... on a 5 μm spherical silica. Other stationary phases are also available—please call and inquire phases. It is ideal for increasing sensitivity and selectivity in LC-MS analyses.Stationary Phase ... Our broadest selection of stationary phases, including unique phases. High-density bondings...

Ultra C18 HPLC Prep Columns

... on a 5 μm spherical silica. Other stationary phases are also available—please call and inquire of a wide range of compounds from acidic through slightly basic.Stationary Phase Category: C18 ... Our broadest selection of stationary phases, including unique phases. High-density bondings...

Ultra C1 Columns (USP L13)

...The Ultra line represents Restek’s broadest selection of stationary phases on a single silica phase features our least-retentive reversed-phase hydrocarbon packing.Stationary Phase Category ... Stationary Phase Category: trimethylsilane (L13)Ligand Type: monomeric C1Particle: 3...

Ultra Silica Columns (USP L3)

...The Ultra line represents Restek’s broadest selection of stationary phases on a single silica is useful for normal-phase or HILIC separations.Stationary Phase Category: bare silica (L3 ... Stationary Phase Category: bare silica (L3)Ligand Type: noneParticle: 3 µm or 5 µm...

Ultra C4 Columns (USP L26)

...The Ultra line represents Restek’s broadest selection of stationary phases on a single silica .Stationary Phase Category: C4, butylsilane (L26)Ligand Type: monomeric C4Particle: 3 µm or 5 µm ... Stationary Phase Category: C4, butylsilane (L26)Ligand Type: monomeric C4Particle: 3...

Ultra Amino Columns (USP L8)

...The Ultra line represents Restek’s broadest selection of stationary phases on a single silica or HILIC analysis of simple sugars.Stationary Phase Category: amino (L8)Ligand Type ... Stationary Phase Category: amino (L8)Ligand Type: aminopropylsilaneParticle: 3 µm...

Ultra Aqueous C18 HPLC Prep Columns

... on a 5 μm spherical silica. Other stationary phases are also available -too-common issue of multiple compounds eluting near the column void time.Stationary Phase Category: modified ... Our broadest selection of stationary phases, including unique phases. High-density bondings...

Pinnacle II PAH Guard Cartridges

...For a detailed description of the stationary phase in this guard cartridge, see...

Ultra Aromax Columns (USP L11)

...The Ultra line represents Restek’s broadest selection of stationary phases on a single silica or selectivity.Stationary Phase Category: phenyl (L11)Ligand Type: proprietary phenyl ligand ... Stationary Phase Category: phenyl (L11)Ligand Type: proprietary phenyl ligand...

Ultra Aqueous C18 Columns (USP L1)

...The Ultra line represents Restek’s broadest selection of stationary phases on a single silica compounds eluting near the column void time.Stationary Phase Category: modified C18 (L1)Ligand ... Stationary Phase Category: modified C18 (L1)Ligand Type: proprietary polar modified...

Ultra C8 Columns (USP L7)

Excellent for a wide range of analyses

...The Ultra line represents Restek’s broadest selection of stationary phases on a single silica is suitable for a wide range of compounds from acidic through slightly basic.Stationary Phase Category ... Stationary Phase Category: C8, octylsilane (L7)Ligand Type: monomeric C8Particle: 3...

Force Biphenyl LC Columns (USP L11)

....restek.com/forceThe innovative Biphenyl is Restek's most popular LC stationary phase because it is particularly adept for complex mobile phases that are not well-suited for MS detection.Stationary Phase Category: Phenyl ... . Restek’s most popular LC stationary phase. phenyl chemistries. Limits ionization suppression and allows simple, MS-friendly mobile phases...

Ultra Cyano Columns (USP L10)

...The Ultra line represents Restek’s broadest selection of stationary phases on a single silica .Stationary Phase Category: cyano (L10)Ligand Type: cyanopropylsilaneParticle: 3 µm or 5 µm ... Stationary Phase Category: cyano (L10)Ligand Type: cyanopropylsilaneParticle: 3 µm...

Ultra PFP Propyl Columns (USP L43)

...The Ultra line represents Restek’s broadest selection of stationary phases on a single silica with highly aqueous mobile phases and HILIC separations.Stationary Phase Category: fluorophenyl propyl ... Stationary Phase Category: fluorophenyl propyl (L43)Ligand Type: pentafluorophenyl propyl...

Ultra IBD Columns (USP L68)

Specialized Columns for Mixed Polar and Nonpolar Compounds

...The Ultra line represents Restek’s broadest selection of stationary phases on a single silica phases.Stationary Phase Category: polar-embedded alkyl (L68)Ligand Type: proprietary polar ... Stationary Phase Category: polar-embedded alkyl (L68)Ligand Type: proprietary polar...

Ultra Biphenyl Columns (USP L11)

...The Ultra line represents Restek’s broadest selection of stationary phases on a single silica . It is ideal for increasing sensitivity and selectivity in LC-MS analyses.Stationary Phase Category ... Stationary Phase Category: phenyl (L11)Ligand Type: unique BiphenylParticle: 3 µm...

Rxi-1301Sil MS Columns (fused silica)

midpolarity Crossbond phase

... of solvents across a range of volatilities. The cyano stationary phase provides more retention of polar compounds than a 5-type column; however, cyano-based stationary phases are prone to high bleed and poor ... and increased uptime. Stabilized cyano phase selectivity improves the performance of existing methods...

Ultra C18 Columns (USP L1)

Excellent for a wide range of analyses

...The Ultra line represents Restek’s broadest selection of stationary phases on a single silica through slightly basic.Stationary Phase Category: C18, octadecylsilane (L1)Ligand Type ... Stationary Phase Category: C18, octadecylsilane (L1)Ligand Type: monomeric C18...

Rtx-65 Columns (fused silica)

mid- to high-polarity phase; Crossbond diphenyl dimethyl polysiloxane

...The Rtx-65 phase contains the highest phenyl content of any bonded stationary phase available stationary phases....

MXT-5 Columns (Siltek-treated stainless steel)

low-polarity phase; Crossbond diphenyl dimethyl polysiloxane

...The diphenyl dimethyl polysiloxane stationary phase is the most popular GC stationary phase ... phases. 4.5" standard coil diameter. ...

Viva Silica Columns (USP L3)

... for normal-phase or HILIC separations.Stationary Phase Category: bare silica (L3)Ligand Type ... Stationary Phase Category: bare silica (L3)Ligand Type: noneParticle: 5 µm...

Pinnacle DB IBD UHPLC Columns (USP L68)

... in highly organic mobile phases.Stationary Phase Category: polar-embedded alkyl (L68)Ligand Type of phases to give chromatographers a stable and selective column. Get the most out of your UHPLC system ... Stationary Phase Category: polar-embedded alkyl (L68)Ligand Type: proprietary polar...

Pinnacle DB Cyano Columns (USP L10)

... of protonated bases.Stationary Phase Category: cyano (L10)Ligand Type: cyanopropylsilane of phases to give chromatographers a stable and selective column. Get the most out of your UHPLC system ... Stationary Phase Category: cyano (L10)Ligand Type: cyanopropylsilaneParticle: 5 µm...

Rtx-200 Secondary Columns for GCxGC (fused silica)

midpolarity phase; Crossbond trifluoropropylmethyl polysiloxane

... stationary phase. Many analysts consider these the best, most inert midpolarity columns available . The trifluoropropyl stationary phase has a unique selectivity that changes elution orders and resolves compounds...

Rtx-5 (G27) Columns (fused silica)

low-polarity phase; Crossbond diphenyl dimethyl polysiloxane

...The diphenyl dimethyl polysiloxane stationary phase is the most popular GC stationary phase ... phases. ...

Rtx-200 Columns (fused silica)

midpolarity phase; Crossbond trifluoropropylmethyl polysiloxane

... stationary phase. Many analysts consider these the best, most inert midpolarity columns available . The trifluoropropylmethyl polysiloxane stationary phase has a unique selectivity that changes elution orders and resolves ... phase. ...

Rtx-200MSLow-Bleed GC-MS Columns (fused silica)

midpolarity phase; Crossbond trifluoropropylmethyl polysiloxane

... stationary phase. Many analysts consider these the best, most inert midpolarity columns available . The trifluoropropylmethyl polysiloxane stationary phase has a unique selectivity that changes elution orders and resolves ... pesticides, chlorinated hydrocarbons, and chlorophenoxy herbicides. Equivalent to USP G6 phase. ...

MXT-2887 Column (Siltek-treated stainless steel)

nonpolar phase; Crossbond 100% dimethyl polysiloxanefor simulated distillation

...MXT-2887 columns' stationary phase, column dimensions, and film thicknesses have been optimized . The Crossbond methyl silicone stationary phase has increased stability compared to packed columns, ensuring...

Rt-βDEXm Columns (fused silica)

permethylated beta cyclodextrin added into 14% cyanopropylphenyl/86% dimethyl polysiloxane

... to our bonded Rtx-1701 stationary phase, we greatly enhance overall utility and column lifetime for our chiral columns, compared to columns that have pure cyclodextrin stationary phases. Separations of more ... Uses: General-purpose chiral phase with many published applications....

Rt-βDEXsm Columns (fused silica)

2,3-di-O-methyl-6-O-tert-butyl dimethylsilyl beta cyclodextrin added into 14% cyanopropylphenyl/86% dimethyl polysiloxane

...By adding β or γ cyclodextrin to our bonded Rtx-1701 stationary phase, we greatly enhance cyclodextrin stationary phases. Separations of more than one hundred chiral compounds have been achieved using...

Rt-βDEXse Columns (fused silica)

2,3-di-O-ethyl-6-O-tert-butyl dimethylsilyl beta cyclodextrin added into 14% cyanopropylphenyl/86% dimethyl polysiloxane

...By adding β or γ cyclodextrin to our bonded Rtx-1701 stationary phase, we greatly enhance cyclodextrin stationary phases. Separations of more than one hundred chiral compounds have been achieved using...

Rt-βDEXsp Columns (fused silica)

2,3-di-O-propyl-6-O-tert-butyl dimethylsilyl beta cyclodextrin added into 14% cyanopropylphenyl/86% dimethyl polysiloxane

...By adding β or γ cyclodextrin to our bonded Rtx-1701 stationary phase, we greatly enhance cyclodextrin stationary phases. Separations of more than one hundred chiral compounds have been achieved using...

Rt-βDEXsa Columns (fused silica)

2,3-di-acetoxy-6-O-tert-butyl dimethylsilyl beta cyclodextrin added into 14% cyanopropylphenyl/86% dimethyl polysiloxane

...By adding β or γ cyclodextrin to our bonded Rtx-1701 stationary phase, we greatly enhance cyclodextrin stationary phases. Separations of more than one hundred chiral compounds have been achieved using...

Rt-γDEXsa Columns (fused silica)

2,3-di-acetoxy-6-O-tert-butyl dimethylsilyl gamma cyclodextrin added into 14% cyanopropylphenyl/86% dimethyl polysiloxane

...By adding β or γ cyclodextrin to our bonded Rtx-1701 stationary phase, we greatly enhance cyclodextrin stationary phases. Separations of more than one hundred chiral compounds have been achieved using...

Rt-TCEP Columns (fused silica)

highly polar phase; 1,2,3-tris[2-cyanoethoxy]propanenot bonded

... after C11 and toluene after C12. The extremely polar Rt-TCEP stationary phase provides a retention index using other high polarity siloxanes.The Rt-TCEP column incorporates a nonbonded stationary phase...

Rxi-PAH Columns (fused silica)

midpolarity proprietary phase

...The Rxi-PAH GC columns were designed by Restek with a higher phenyl-content stationary phase of the stationary phase increase thermal stability and ruggedness so relatively nonvolatile, higher molecular weight...

Rtx-OPPesticides2 Columns (fused silica)

proprietary Crossbond phase

...Using sophisticated computer modeling software, we created two stationary phases for separating of these phases (330 °C) allows analysts to bake out high molecular weight contamination typically associated...

Rtx-VRX Columns (fused silica)

proprietary Crossbond phase

...The Rtx-VRX stationary phase and optimized column dimensions provide low bleed, excellent...

GCxGC Selectivity Kit, 0.15 mm

... Wide range of stationary phases offers orthogonal separations. High thermal...

GCxGC Selectivity Kit, 0.18 mm

... Wide range of stationary phases offers orthogonal separations. High thermal...

GCxGC Selectivity Kit, 0.25 mm

... Wide range of stationary phases offers orthogonal separations. High thermal...

Rt-QS-BOND Columns (fused silica PLOT)

porous divinylbenzene homopolymer

...Porous polymers are unique, highly retentive stationary phases with a wide application range...

Rt-S-BOND Columns (fused silica PLOT)

porous divinylbenzene homopolymer

...Porous polymers are unique, highly retentive stationary phases with a wide application range...

Pinnacle DB C18 Columns (USP L1)

... of compounds from acidic through slightly basic.Stationary Phase Category: C18, octadecylsilane (L1 of phases to give chromatographers a stable and selective column. Get the most out of your UHPLC system ... Stationary Phase Category: C18, octadecylsilane (L1)Ligand Type: monomeric C18...

Pinnacle DB Silica Columns (USP L3)

...-deactivated spherical silica is useful for normal-phase or HILIC separations.Stationary Phase Category: bare of phases to give chromatographers a stable and selective column. Get the most out of your UHPLC system ... Stationary Phase Category: bare silica (L3)Ligand Type: noneParticle: 1.9 µm, 3 µm...

Viva C18 Columns (USP L1)

... slightly basic.Stationary Phase Category: C18, octadecylsilane (L1)Ligand Type: monomeric C18 ... Stationary Phase Category: C18, octadecylsilane (L1)Ligand Type: monomeric C18...

Pinnacle DB Biphenyl Columns (USP L11)

... and selectivity in LC-MS analyses.Stationary Phase Category: phenyl (L11)Ligand Type: unique Biphenyl of phases to give chromatographers a stable and selective column. Get the most out of your UHPLC system ... Stationary Phase Category: phenyl (L11)Ligand Type: unique BiphenylParticle: 1.9 µm...

Pinnacle DB PFP Propyl Columns (USP L43)

... with highly aqueous mobile phases and HILIC separations.Stationary Phase Category: fluorophenyl propyl of phases to give chromatographers a stable and selective column. Get the most out of your UHPLC system ... Stationary Phase Category: fluorophenyl propyl (L43)Ligand Type: pentafluorophenyl propyl...

Pinnacle DB C8 Columns (USP L7)

... is suitable for a wide range of compounds from acidic through slightly basic.Stationary Phase Category of phases to give chromatographers a stable and selective column. Get the most out of your UHPLC system ... Stationary Phase Category: C8, octylsilane (L7)Ligand Type: monomeric C8Particle: 3...

Viva C8 Columns (USP L7)

... of compounds from acidic through slightly basic.Stationary Phase Category: C8, octylsilane (L7 over a traditional C18 phase. Like our C18, this general-purpose Restek C8 is suitable for a wide range ... Stationary Phase Category: C8, octylsilane (L7)Ligand Type: monomeric C8Particle: 5...

Viva C4 Columns (USP L26)

... or Viva C8.Stationary Phase Category: C4, butylsilane (L26)Ligand Type: monomeric C4 excellent peak shape for a wide range of compounds. Less retention in reversed-phase assays than Viva C18 ... Stationary Phase Category: C4, butylsilane (L26)Ligand Type: monomeric C4Particle: 5...

Viva PFP Propyl Columns (USP L43)

... with highly aqueous mobile phases and HILIC separations.Stationary Phase Category: fluorophenyl propyl it is more reliable and efficient with acidic mobile phases. This versatile column is also compatible ... Stationary Phase Category: fluorophenyl propyl (L43)Ligand Type: pentafluorophenyl propyl...

Viva Biphenyl Columns (USP L11)

... for increasing sensitivity and selectivity in LC-MS analyses.Stationary Phase Category: phenyl (L11 , or conjugated solutes—and enhanced orthogonal selectivity when using methanol mobile phases. It is ideal ... Stationary Phase Category: phenyl (L11)Ligand Type: BiphenylParticle: 5 µm...

Pinnacle DB Aqueous C18 Columns (USP L1)

... compounds eluting near the column void time.Stationary Phase Category: modified C18 (L1)Ligand of phases to give chromatographers a stable and selective column. Get the most out of your UHPLC system ... Stationary Phase Category: modified C18 (L1)Ligand Type: proprietary polar modified...

Raptor Biphenyl LC Columns (USP L11)

....restek.com/raptorThe innovative Biphenyl is Restek's most popular LC stationary phase because it is particularly adept detection.Stationary Phase Category: Phenyl (L11)Ligand Type: BiphenylParticle: 1.8 µm, 2 ... phenyl chemistries. Limits ionization suppression and allows simple, MS-friendly mobile phases...

Rtx-2330 Columns (fused silica)

highly polar phase; biscyanopropyl cyanopropylphenyl polysiloxane

...Rtx-2330 is one of the most polar capillary column stationary phases. Cyano groups on both sides of the polymer backbone give the phase a strong dipole moment and high selectivity for cis ... . Equivalent to USP G8 and G48 phase. ...

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

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

... will meet your needs every time you install a new column.The Rxi-5Sil MS stationary phase the phase less prone to oxidation. Rxi-5Sil MS columns are ideal for GC/MS applications requiring high...

Rtx-OPPesticides Columns (fused silica)

proprietary Crossbond phase

...Using sophisticated computer modeling software, we created two stationary phases for separating of these phases (330 °C) allows analysts to bake out high molecular weight contamination typically associated...

PFAS Delay Column

... system where they can leach into the mobile phase and interfere with sample analysis. This contamination ... to 15,000 psi (1034 bar). o Both FPP and SPP analytical columns. o All stationary phases...

Stabilwax-DB Columns (fused silica)

polar phase; Crossbond base-deactivated Carbowax polyethylene glycolfor amines and basic compounds

... temperatures, use an Rtx-5 Amine column.Stabilwax-DB is a bonded stationary phase, but avoid rinsing...

Rtx-1301 (G43) Columns (fused silica)

low- to midpolarity phase

...Many analysts feel the Rtx-1301 column has the best cyanosiloxane bonded stationary phase ... organic compounds. Equivalent to USP G43 phase. ...

Rtx-1701 Columns (fused silica)

midpolarity Crossbond phase

...Rtx-1701 is one of the more popular stationary phases used in capillary GC. The mix of cyano ... ), pesticides, and fragrance compounds. Equivalent to USP G46 phase. ...

MXT-Volatiles Columns (Siltek-treated stainless steel)

proprietary Crossbond diphenyl/dimethyl polysiloxane phase

... with an ELCD. The diphenyl/dimethyl polysiloxane based MXT-Volatiles stationary phase provides low bleed...

MXT-502.2 Columns (Siltek-treated stainless steel)

proprietary Crossbond diphenyl/dimethyl polysiloxane phase

.../dimethyl polysiloxane based MXT-502.2 stationary phase provides low bleed and thermal stability to 320 °C. A 105-meter...

Rtx-Volatiles Columns (fused silica)

proprietary Crossbond diphenyl/dimethyl polysiloxane phase

... with an ELCD. The diphenyl/dimethyl polysiloxane based Rtx-Volatiles stationary phase provides low bleed...

Rtx-502.2 Columns (fused silica)

proprietary Crossbond diphenyl/dimethyl polysiloxane phase

.../dimethyl polysiloxane based Rtx-502.2 stationary phase provides low bleed and thermal stability to 270 °C. A 105-meter...

Rtx-624 Columns (fused silica)

low- to midpolarity phase

... six gases in EPA Methods 8260 and 524.2. This stationary phase is especially well-suited for EPA resolution of early eluting compounds. The Rtx-624 phase produces greater than 90% resolution of the first ... . Equivalent to USP G43 phase. ...

Rt-Q-BOND Columns (fused silica PLOT)

100% divinylbenzene

...Porous polymers are unique, highly retentive stationary phases with a wide application range...

Rt-U-BOND Columns (fused silica PLOT)

divinylbenzene ethylene glycol/dimethylacrylate

...Porous polymers are unique, highly retentive stationary phases with a wide application range...

Fragrance Materials Test Mix (12 components)

... in detecting inlet problems, stationary phase degradation, loss of resolution, changes in sensitivity...

Rtx-VMS Columns (fused silica)

proprietary Crossbond phase

... for separating volatile organic compounds, such as those listed in U.S. EPA Method 8260B. The Rtx-VMS stationary phase is a highly stable polymer that provides outstanding analysis of volatile compounds ... in less than 10 minutes. Stable to 260 °C. No known equivalent phases. ...

Rtx-DHA Columns (fused silica)

Crossbond 100% dimethyl polysiloxaneoptimized for hydrocarbon analysis

... for retention, efficiency, stationary phase selectivity, and bleed—guaranteeing...

Rtx-Mineral Oil Columns (fused silica)

...The Rtx-Mineral Oil stationary phase and column dimensions were optimized for the fast screening ... . Optimized column dimensions for fast mineral oil screening. Surface linked phase guarantees long...

Rxi-35Sil MS Columns (fused silica)

midpolarity Crossbond phase

... and readily available hydrogen carrier gas. The arylene content of the Rxi-35Sil MS stationary phase ensures ... for cannabinoids. Very low-bleed phase for GC-MS analysis. Extended temperature range: 50 °C...

Pinnacle II PAH HPLC Columns

...). The Pinnacle II PAH stationary phase incorporates a proprietary C18 bonding that enables unique shape PAH compounds. Every lot of Pinnacle II PAH bonded phase material is tested to ensure baseline...

Rtx-CLPesticides Column Kit, 0.25 mm ID

proprietary Crossbond phases

... compared to other stationary phases.Note: Analyzing dirty or derivatized samples can contaminate resolution and faster analyses, compared to 1701 or phenyl phases, make these the pesticide columns of choice...

Rt-Alumina BOND/KCl Columns (fused silica PLOT)

KCl deactivation

... oxide stationary phase is minimized, by deactivation with inorganic salts like KCl or Na2SO ; select phases are also available on metal MXT tubing. To ensure reproducible retention times...

Rxi-5Sil MS Columns (fused silica)

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

... will meet your needs every time you install a new column.The Rxi-5Sil MS stationary phase the phase less prone to oxidation. Rxi-5Sil MS columns are ideal for GC-MS applications requiring high...

Force FluoroPhenyl LC Columns (USP L43)

... reliable and efficient with acidic mobile phases.Stationary Phase Category: Pentafluorophenyl propyl 's FluoroPhenyl phase offers chromatographers the ability to run in reversed-phase or HILIC mode ... Capable of both reversed-phase and HILIC separations. Ideal for increasing...

Rtx-CLPesticides Columns (fused silica)

proprietary Crossbond phase

... throughput compared to other stationary phases.Note: Analyzing dirty or derivatized samples can Improved resolution and faster analyses, compared to 1701 or phenyl phases, make...

Rtx-CLPesticides2 Columns (fused silica)

proprietary Crossbond phase

... throughput compared to other stationary phases.Note: Analyzing dirty or derivatized samples can Improved resolution and faster analyses, compared to 1701 or phenyl phases, make...

Roc C18 HPLC Columns (USP L1)

....Stationary Phase Category: C18, octadecylsilane (L1)Ligand Type: monomeric C18Particle: 3 μm or 5 ... -volume workflows—high-purity, fully porous silica backed by quality manufacturing features a variety of phases phases cover 98% of USP methods. ...

Roc Phenyl-Hexyl HPLC Columns (USP L11)

....Stationary Phase Category: phenyl (L11)Ligand Type: phenyl-hexylParticle: 3 μm or 5 μm, spherical -carbon chain. This high-purity, highly retentive phase features alternative selectivity to straight chain ... -volume workflows—high-purity, fully porous silica backed by quality manufacturing features a variety of phases phases cover 98% of USP methods. ...

Roc Cyano HPLC Columns (USP L10)

.... It is an excellent choice for the analysis of protonated bases.Stationary Phase Category: Cyano (L10 be used in normal-phase, reversed-phase (best with mobile phase pH between 5 and 7), and HILIC modes ... -volume workflows—high-purity, fully porous silica backed by quality manufacturing features a variety of phases phases cover 98% of USP methods. ...

Roc Silica HPLC Columns (USP L3)

... or HILIC separations.Stationary Phase Category: bare silica (L3)Ligand Type: n/aParticle 't, with Roc LC columns from Restek.Base-deactivated spherical silica is useful for normal-phase ... -volume workflows—high-purity, fully porous silica backed by quality manufacturing features a variety of phases phases cover 98% of USP methods. ...

Rtx-CLPesticides Column Kit, 0.53 mm ID

proprietary Crossbond phases

... compared to other stationary phases.Note: Analyzing dirty or derivatized samples can contaminate resolution and faster analyses, compared to 1701 or phenyl phases, make these the pesticide columns of choice...

Rtx-CLPesticides Column Kit, 0.32 mm ID

proprietary Crossbond phases

... compared to other stationary phases.Note: Analyzing dirty or derivatized samples can contaminate resolution and faster analyses, compared to 1701 or phenyl phases, make these the pesticide columns of choice...

Rt-Alumina BOND/Na2SO4 Columns (fused silica PLOT)

Na2SO4 deactivation

... oxide stationary phase is minimized, by deactivation with inorganic salts like KCl or Na columns are manufactured on fused silica tubing; select phases are also available on metal MXT tubing...

Roc C8 HPLC Columns (USP L7)

... from acidic through slightly basic.Stationary Phase Category: C8, octylsilane (L7)Ligand C18 phase. Like our C18, this general-purpose Restek C8 is suitable for a wide range of compounds ... silica backed by quality manufacturing features a variety of phases to fit most HPLC methods . Ideal for a wide range of applications from food to pharma; 5 phases cover 98% of USP methods. ...

Raptor HILIC-Si LC Columns (USP L3)

....restek.com/raptorStationary Phase Category: bare silica (L3)Ligand Type: noneParticle: 2.7 µm superficially porous ... . Fully compatible with both HPLC and UHPLC when using low back-pressure HILIC mobile phases...

Raptor EtG/EtS LC Column

....restek.com/raptorStationary Phase Category: ProprietaryLigand Type: ProprietaryParticle: 2.7 μm superficially porous to traditional phases.Switch to the Raptor EtG/EtS when: Other columns can’t resolve Et...

Rt-Alumina BOND/CFC Columns (fused silica PLOT)

... oxide stationary phase is minimized, by deactivation with inorganic salts like KCl or Na2SO ; select phases are also available on metal MXT tubing. To ensure reproducible retention times...

Force C18 LC Columns (USP L1)

... of a wide range of compounds from acidic through slightly basic.Stationary Phase Category: C18 .Properties: Compatible with moderately acidic to neutral mobile phases (pH 2 ... A traditional end-capped C18 ideal for general-purpose use in reversed-phase...

Rt-Alumina BOND/MAPD Columns (fused silica PLOT)

... oxide stationary phase is minimized, by deactivation with inorganic salts like KCl or Na2SO ; select phases are also available on metal MXT tubing. To ensure reproducible retention times...

Raptor ARC-18 LC Columns (USP L1)

... assays by LC-MS/MS, the acid-resistant Raptor ARC-18 truly is ahead of the curve.Stationary Phase -balanced retention profile without the drawbacks of using an ordinary C18 in the harsh, acidic mobile phases needed ... . Sterically protected to endure low-pH mobile phases without sacrificing retention or peak quality...

Raptor FluoroPhenyl LC Columns (USP L43)

....Stationary Phase Category: Pentafluorophenyl propyl (L43)Ligand Type: FluorophenylParticle: 1.8 µm with the addition of Raptor FluoroPhenyl columns. Restek's Raptor FluoroPhenyl phase offers chromatographers ... Capable of both reversed-phase and HILIC separations. Ideal for increasing...

Raptor C18 LC Columns (USP L1)

... there with the only general-purpose C18 that gives you Selectivity Accelerated.Stationary Phase Category: C18 hydrophobic retention of any Raptor phase, and it is compatible with a wide range of mobile phases from ... A traditional end-capped C18 ideal for general-purpose use in reversed-phase , and compounds. Offers the highest hydrophobic retention of any Raptor phase. Part of Restek...

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...

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...

Impact of the GC Parameters on the Separation—Part 4: Choice of Film Thickness (PDF 1086kB)

..., Restek Corporation In parts 1–3 of this series, we focused on the selection of stationary phase, column length, and internal diameter. The stationary phase is deposited as a film or a layer and its thickness...

Ghost Peaks in Gas Chromatography Part 3: Sample Contamination and Ghost Peaks Formed by the Stationary Phase Itself (PDF 1619kB)

... by the Stationary Phase Itself Jaap de Zeeuw, Restek Corporation In the last issue, we discussed possible sources in unwanted “extra” peaks. Also, the stationary phase in the column can play an interesting role in ghost peak...

Guide to GC Column Selection and Optimizing Separations Brochure (PDF 3879kB)

... column stationary phase, length, inner diameter (ID), and film thickness for your specific applications and optimize your separation. Look for application-specific stationary phases first; these columns...

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

... mobile phases, operational parameters, and instrumentation. But because stationary phases offer more , including mass spectrometry (MS) and refractive index (RI). On the other hand, changing stationary phases ... column selectivity, peak separation, stationary phase, chromatographic resolution, USLC...

How to Understand and Deal with Overloading in GC (PDF 241kB)

..., overloading can change the retention time of the component. As the stationary phase is saturated , the component itself will also act as a stationary phase resulting in ‘strange’ chromatograms. Overloading...

Impact of the GC Parameters on the Separation—Part 2: Choice of Column Internal Diameter (PDF 1423kB)

... Zeeuw, Restek Corporation In part 1 of this series, we focused on how to select the stationary phase , which is one of the seven important parameters we need to understand. Once the stationary phase...

Restek PAL SPME Fibers Instruction Sheet (PDF 254kB)

... compounds from solid, liquid, and vapor matrices onto a stationary phase that is bonded to a fused silica with different stationary phases and film thicknesses to support a wide range of analyte chemistries and sample...

Analysis of Gases via Gas Chromatography: Nitrous Oxide (PDF 327kB)

... nitrous oxide is a gas under ambient conditions, it will not be retained by liquid stationary phases . Using an adsorbent stationary phase, such as porous polymers, is a better approach because adsorbents...

Impact of the GC Parameters on the Separation—Part 1: Choice of the Stationary Phase (PDF 918kB)

...Impact of the GC Parameters on the Separation—Part 1: Choice of the Stationary Phase Jaap de Zeeuw...

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

... fast and developing methods faster. Each USLC stationary phase is optimized for a different chemical -polar and prefer neutral stationary phases and solvents. Hydrocarbons are the ideal example of hydrophobic ... , method development, stationary phase, column selectivity...

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

... an analyte spends in the stationary phase to the amount of time it spends in the mobile phase. Since all is the ratio of the amount of time the later eluting analyte spends in the stationary phase relative...

Restek PAL SPME Arrow Instruction Sheet (PDF 307kB)

... stationary phase volumes and greater mechanical stability. Following extraction, the analytes are typically Arrows are available with different stationary phases and film thicknesses to support a wide range...

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

... of selectivity in the industry using just 4 unique stationary phases: the USLC column set. We also defined is finding the proper stationary phase for a particular separation. As sample complexity increases, achieving ... column selectivity, peak separation, stationary phase, chromatographic resolution...

Impact of the GC Parameters on the Separation—Part 3: Choice of Column Length (PDF 1442kB)

..., Restek Corporation In parts 1 and 2 of this series we focused on selection of stationary phase...

Impact of the GC Parameters on the Separation—Part 5: Choice of Column Temperature (PDF 1135kB)

..., Restek Corporation In parts 1–4 of this series, we focused on the selection of stationary phase, column...

Impact of the GC Parameters on the Separation—Part 6: Choice of Carrier Gas and Linear Velocity (PDF 604kB)

... of the column dimensions and stationary phase. We also saw that temperature has a big impact on chromatography...

Rtx-2887 / MXT-2887: Restek's Capillary GC Columns for Simulated Distillation of Petroleum Fractions (PDF 947kB)

... columns.1,2 Capillary columns with crossbonded stationary phases offer several advantages compared distribution from GC data since a nonpolar stationary phase operated under temperature programmed conditions...

Single-Column Method for HPLC Analysis of Organic Acids in Fruit Juices, Using an Allure Organic Acids Column (PDF 636kB)

... mobile phase is needed to increase interaction between the acids and the stationary phase, but stationary and the stationary phase. Now there is a simpler and more reliable approach. A single 30cm Allure Organic Acids...

ChromaBLOGraphy: Why Biphenyl is a very interesting primary choice as stationary phase in LC..

Being a GC chemist for almost 38 years I always wondered why most LC separations are performed on a C18. A C18 is an extremely good non-polar stationary phase and is the foundation of reversed-phase chromatography, where polar mobiles phases are used with non-polar stationary phases. But there are so many C18 phases, how do […]

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

...) with typical stationary phases show shorter retention times than fully porous particles, but still exhibit less resolution. Only Raptor LC columns with highly selective USLC stationary phases show shorter retention...

News: GC-MS Analysis of Phthalates: Comparison of GC Stationary Phase Performance

Author(s): Dan Li, Rebecca Stevens, and Chris English Restek Corporation Published By: Restek Corporation Year of Publication: 2016 Link: http://www.restek.com/Technical-Resources/Technical-Library/General-Interest/gen_GNAN2380-UNV Abstract: Phthalates are ubiquitous in the environment and have attracted attention due to their potential adverse impact on human health. For … Continue reading

Rtx-BAC1 and Rtx-BAC2 Columns (PDF 378kB)

... volatile substances in clinical and forensic specimens. The combination of selective stationary phase...

Integra-Guard Columns Instruction Sheet (PDF 272kB)

... of the capillary column that has been deactivated but not coated with stationary phase. Because it is integrated with the analytical column (liquid phase coated section of the column) (Figure 1). The guard column should...

News: Impact of GC Parameters on the Separation Part I: Choice of the Stationary Phase

Author(s): Jaap de Zeeuw Restek Corporation Published By: Separation Science Issue: vol. 6, issue 2 Year of Publication: 2014 For the full print issue, visit http://www.sepscience.com/docs/Bespoke/Editions/SepSci/SepSci022014eu.pdf Abstract: In this series, we will discuss the impact of different parameters on the actual … Continue reading

GC-MS Analysis of Phthalates: Comparison of GC Stationary Phase Performance

...mployed to determine the optimal stationary phases and conditions for phthalate GC-MS analysis. The sep aration of phthalates was compared on seven different stationary phases: Rtx-440, Rxi-XLB, Rxi-5ms, Rtx-50, Rxi-3...

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

... columns contain alkyl stationary phases that separate compounds primarily through dispersive interactions be separated based on their hydrophobicity. In contrast, Restek’s FluoroPhenyl stationary phase operates...

GC-MS Analysis of Phthalates: Comparison of GC Stationary Phase Performance (PDF 1255kB)

...GC-MS Analysis of Phthalates: Comparison of GC Stationary Phase Performance By Dan Li, Rebecca was employed to determine the optimal stationary phases and conditions for phthalate GC-MS analysis...

Barbiturate Analysis (PDF 21kB)

... barbiturates using an Rtx-35 column. Lower polarity stationary phases like the Rtx-5 can be used to separate the barbiturates, but intermediate polarity stationary phases tend to provide better peak shape and improved...

Featured Application: Derivatized Amphetamines on Rxi-5Sil MS (PDF 790kB)

... harsh and can reduce GC column lifetime by damaging the stationary phase. Phase damage usually be obtained by using a highly inert Rxi-5Sil MS column. The unique Rxi-5Sil MS stationary phase, with its...

News: Ghost Peaks in Gas Chromatography Part 3: Sample Contamination and Ghost Peaks Formed by The Stationary Phase Itself

Author(s): Jaap de Zeeuw Restek Corporation Published By: Separation Science Issue: vol. 5, issue 7 Year of Publication: 2013 Link: http://www.sepscience.com/Information/Archive/All-Articles/2198-/Ghost-Peaks-in-Gas-Chromatography-Part-3-Sample-Contamination-and-Ghost-Peaks-Formed-by-The-Stationary-Phase-Itself For the full print issue, visit http://www.sepscience.com/docs/Bespoke/Editions/SepSci/Sepsci0713eu.pdf?utm_source=iContact&utm_medium=email&utm_campaign=eLearning%20Newsletter%20-%20Europe%20Sep%20Sci&utm_content= Abstract: In the last issue we discussed possible sources for ghost peaks … Continue reading

Robust Analysis of Fatty Acids in Milk: An Independent Lifetime Evaluation of Rt-2560 GC Columns (PDF 464kB)

... of double bonds. However, coating a long column with a thin layer of highly polar stationary phase , MEGA-10 • Stationary phase selectivity optimized for isomer separation to ensure accurate...

News: Analysis of Gases and Low Boiling Point Samples Using Highly Retentive Stationary Phases (Chapter 18 in Practical Gas Chromatography)

Author(s): Jaap de Zeeuw Restek Corporation Published By: Springer Year of Publication: 2014 Links: View flyer: productFlyer_978-3-642-54639-6 Chapter alone: http://link.springer.com/chapter/10.1007/978-3-642-54640-2_18 Full book: http://link.springer.com/chapter/10.1007/978-3-642-54640-2_1 ​ Abstract: In this chapter of the newly published book, Practical Gas Chromatography (eds. Katja Dettmer-Wilde and … Continue reading

Highly Reproducible Detailed cis/trans FAMEs Analysis Ensured by New Optimized Rt-2560 Column Manufacturing and Application-Specific QC Test (PDF 2297kB)

..., nonbonded, biscyanopropyl polysiloxane stationary phase housed in a 100 m x 0.25 mm x 0.20 μm column format of the original column, such as selectivity, sample loading capacity, stationary phase bleed, and thermal...

News: Application and Limitation of Using Adsorbents as Stationary Phases in Gas Chromatography for the Separation of Volatile Compounds

Author(s): Jaap de Zeeuw Published By: Separation Science Issue: vol. 4, issue 11 Year of Publication: 2012 Link: http://www.sepscience.com/emails/sepsci0912i2eu.pdf Abstract:  Adsorbents have unique separation characteristics. The adsorption process allows very volatile components to be retained at higher temperatures that create … Continue reading

DiatoSorb-W Diatomaceous Earth: Great Chromatography Millions of Years in the Making (PDF 8227kB)

... with our stationary phases and inert tubing types to ensure our white diatomaceous earth columns provide of stationary phases on DiatoSorb-W solid support in 60/80, 80/100, and 100/120 mesh sizes for those who pack...

DiatoSorb-W Diatomaceous Earth: Great Chromatography Millions of Years in the Making (PDF 1812kB)

... with our stationary phases and inert tubing types to ensure our diatomaceous earth columns provide of stationary phases on DiatoSorb-W solid support in 60/80, 80/100, and 100/120 mesh sizes for those who pack...

Selectivity in Gas Chromatography

..., requires an intimate knowledge of stationary phase chemistry and an understanding of how compounds interact with and become distinguished by the stationary phase. Over quite a lengthy career in gas chromatography, I have...

ChromaBLOGraphy: Comparison between Different Stationary Phases for the Separation of Phthalates using Gas Chromatography-Mass Spectrometry (GC-MS)

Dan Li, Rebecca Stevens, and Chris English Phthalates are widely used as plasticizers in a variety of industry products. However, some phthalates are considered as endocrine disruptors[1] associated with a number of problems, including birth defects[2], high blood pressure in children[3], pregnancy-induced hypertensive heart diseases[4], respiratory problems[5], and obesity[6]. The European Union (EU) and United States Environmental Protection Agency (US EPA) […]

The GC Separation Process A simple model for non-mathematically minded chromatographers

.... Step 1: Between contacts with the stationary phase, the solute molecule diffuses through the gas . Step 2: The molecule diffuses within the stationary phase film ... . The relationships among phase, flow, temperature, and capacity are explored. ... Gas chromatography, stationary phase, flow, column capacity, GC, Konrad Grob...

GC Column Selection Poster

... gradient charts for column stationary phase, film thickness, inner diameter, and length make it easy ... . Simple gradient charts for column stationary phase selectivity, film thickness, internal diameter...

ChromaBLOGraphy: Don’t overestimate cannabidiol during medical cannabis potency determinations with gas chromatography. Use stationary phase selectivity for accuracy and hydrogen for fast analysis.

It’s important to properly quantify cannabidiol in medical marijuana samples, as it is one of the chief cannabinoid compounds with pharmacological value, including relief against nausea, anxiety, and inflammation.  However, on typically used “5 type” GC columns, it can coelute with cannabichromene, a compound that likely also has medical value and is more and more [...]

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

... parameters, and instrumentation. But because stationary phases offer more significant selectivity differences -subtraction model (H-S model), identify a set of just 4 stationary phases—Restek’s USLC column set—that encompasses ... . In this article, we discuss column choice and identify a set of just 4 stationary phases—Restek’s USLC column set—that encompasses the widest range of reversed phase selectivity available today....

Rxi GC Columns Brochure (PDF 2422kB)

... also develop our own proprietary stationary phases. Our California-based research facility, “Restek Column Choosing the right stationary phase can make all the difference for the success of your analysis...

NEW! Rx-1301Sil MS GC Columns (PDF 1237kB)

... that are well suited for the analysis of solvents across a range of volatilities. The cyano stationary phase provides more retention of polar compounds than a 5-type column; however, cyano-based stationary phases...

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

... incorporate a new stationary phase chemistry, unique column deactivation, and optimized manufacturing process in stationary phase bleed that can reduce column lifetime, decrease detector sensitivity, and interfere...

Grape Flavor Analysis Using an Rt-γDEXsa GC Column (PDF 61kB)

...-tert-butyldimethylsilyl-gcyclodextrins that are dissolved into cyanopropyl phenyl stationary phase (Rtx-1701). This composition promotes thermal stability -cyclodextrin stationary phases provide enantioselectivity for a variety of chiral compounds, but not for methyl-3...

A Guide to the Analysis of Chiral Compounds by GC (PDF 3410kB)

...-cyclodextrin stationary phases with enhanced capabilities for chiral capillary gas chromatography. The Rt-βDEXsm and Rt research interests focused upon natural product chemistry, and development of HPLC and GC stationary phases...

ChromaBLOGraphy: Put some backbone into it, man! Improving GC separations for chlorinated dioxins and furans by modification of the backbone of the siloxane polymer stationary phase

For a long time now we’ve had backbone modifications of the siloxane polymers we use in gas chromatography to help us reduce bleed.  By insertion of a bulky modifier group (e.g. phenyl, biphenyl, carborane, etc.), we make the polymer more rigid and reduce its tendency to “back-bite” and break off cyclic siloxanes that are detected [...]

Analysis of Trace Oxygenates in Petroleum-Contaminated Wastewater, Using Purge-and-Trap GC-MS (U.S. EPA Methods 5030B & 8260) (PDF 477kB)

... stationary phases in capillary gas chromatography columns, and share ions used for identification in gas ”-type stationary phases do not resolve TBA and MTBE adequately for positive identification andreliable...

Raptor Biphenyl LC Columns Sales Sheet (PDF 3731kB)

...Stationary Phase: Biphenyl Fast, Rugged Raptor Columns with Time-Tested Selectivity The industry -leading Biphenyl, first introduced by Restek in 2005, is our most popular LC stationary phase because...

Comprehensive LC-MS/MS Analysis of 15 Bisphenols in 8 Minutes (PDF 519kB)

... popular LC stationary phase because it is particularly adept at separating compounds that are hard -Bonding Polarizability Cation Exchange Column Characteristics: Stationary Phase Category: Phenyl (L11) Ligand Type...

New Rxi-PAH GC Column; Resolve Important Isobaric Polycyclic Aromatic Hydrocarbons for Food Safety and Environmental Methods (PDF 714kB)

...-content stationary phase that provides a unique selectivity to separate important polycyclic aromatic hydrocarbons of the stationary phase increase thermal stability and ruggedness so relatively nonvolatile, higher molecular weight...

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

...Stationary Phase: ARC-18 Ahead of the Curve for Large, Multiclass Lists by Mass Spec Designed by LC-MS/MS. • You require strongly acidic (pH 1–3) mobile phases. Stationary Phase Category: C18...

How do intrinsically base-deactivated phases work?

... Analyzing basic compounds can be somewhat troublesome on traditional alkyl stationary phases analyte selectivities through a wide variety of bonded stationary phases. If we consider ... Analyzing basic compounds can be somewhat troublesome on traditional alkyl stationary phases analyte selectivities through a wide variety of bonded stationary phases....

Raptor SPP C18 Columns Sales Sheet (PDF 1888kB)

...Stationary Phase: C18 Si TMSTMSO Raptor Speed, Efficiency, and Ruggedness—in C18 Every LC lab of hydrophobic compounds. Stationary Phase Category: C18, octadecylsilane (L1) Ligand Type: End-capped C18...

Analyzing Oxygenates in Petroleum-Contaminated Wastewater (PDF 285kB)

..., ensuring greater confidence in the data obtained. Still, the stationary phase must be chosen with care be separated. "624"-type stationary phases and Rtx-Volatiles columns inadequately resolve the target compounds...

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

... that produces high levels of bleed. Column bleed occurs when the stationary phase is lost during exposure Rxi-5Sil MS columns contain a silarylene-modified stationary phase, which provides nearly identical...

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

...-minute analysis time. The Raptor EtG/EtS column features a novel stationary phase developed specifically . Matrix interferences are still well resolved even after 1,000 sample injections. Mobile Phase A: 0...

ChromaBLOGraphy: Selectivity differences for drugs of abuse when using Rxi-5ms and Rxi-5Sil MS GC columns: pendant diphenyl versus silarylene stationary phases.

Previously I had written about seeing differences in selectivity when analyzing pesticides on Rxi-5ms and Rxi-5Sil MS GC columns.  As you may remember (if you’re younger than me because I can’t remember almost anything these days!), the 5ms is a 5% pendant phenyl column and the 5Sil MS has phenyl content in the siloxane stationary [...]

ChromaBLOGraphy: First GC Separation of 2,3,4,7,8-Pentachlorodibenzofuran from Other Potential Interfering Congeners Performed on a Non-Cyano Stationary Phase: The Rtx-Dioxin2

I just presented a lecture in Venice at the 7th International POPs Symposium sponsored by Thermo Scientific and showed the first ever, to my knowledge, GC separation of 2,3,4,7,8-pentachlorodibenzofuran (23478 PeCDF) from any interfering congeners on a non-cyano stationary phase, the Rtx-Dioxin2.  Although 2,3,7,8-tetrachlorodibenzodioxin (2378 TCDD) and 2,3,7,8-tetrachlorodibenzofuran (2378 TCDF) get most of the press [...]

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

... column lifetimes by damaging the stationary phase. Phase damage usually manifests as increased bleed and tailing of active compounds. The unique Rxi-5Sil MS stationary phase, with its embedded arylene groups...

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

... of target analytes, focusing on stationary phase selectivity when choosing the analytical column allowed us with better selectivity and retention. • Biphenyl column and MS-friendly mobile phases allow easy transfer...

Raptor FluoroPhenyl LC Columns Sales Sheet (PDF 1816kB)

...Stationary Phase: FluoroPhenyl Get the Power of HILIC and RP Modes in One LC Column Reversed-phase : • Polarizability • Dispersion Stationary Phase Category: Pentafluorophenyl propyl (L43) Ligand Type...

DiatoSorb-W Diatomaceous Earth: Great Chromatography Millions of Years in the Making (PDF 7855kB)

... Bonded Stationary Phase Packed Columns Stainless Steel Tubing SilcoSmooth Tubing** L OD ID L OD Earth Packed Columns Nonbonded Stationary Phase Packed Columns Column Instrument Configurations...

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

.... It is a separation mode that uses a polar stationary phase, which can be bare silica, like the Raptor HILIC-Si column and modifiers may also be used. Because HILIC stationary phases are polar, the technique is well suited...

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

... columns due to the loss of stationary phase (column bleed) that occurs during GC oven temperature cycling range of compounds at varying concentrations, a stationary phase that offers good selectivity...

LC-MS/MS Analysis of 58 Antipsychotics and Antidepressants in Human Urine (PDF 792kB)

... Properties The innovative Biphenyl is Restek’s most popular LC stationary phase because it is particularly -Bonding Polarizability Cation Exchange Column Characteristics: Stationary Phase Category: Phenyl (L11) Ligand Type...

Versatile GHB Method For Headspace or Liquid Injection (PDF 1100kB)

...% diphenyl/95% dimethyl polysiloxane stationary phase is the mostpopular GC stationary phase and is used (10-15µL) since theentire sample is in the gaseous phase in the head-space vial and higher pressure...

Rapidly Analyze a Wide Range of Glycol Ethers by GC-MS Using the New Rxi-1301Sil MS Column (PDF 1176kB)

... selectivity to that of 624-type columns as both are based on cyanopropylphenyl stationary phases; however Alternative Th e Rxi-1301Sil MS column is based on the same stationary phase chemistry as the Rxi-624Sil MS...

Raptor Biphenyl LC Columns Brochure (PDF 6071kB)

...Selectivity Accelerated Stationary Phase: Biphenyl CH3 Si CH3 O Pure Chromatography www . The industry-leading Biphenyl is Restek’s most popular LC stationary phase because it is particularly adept...

Fast Analysis of Polycyclic Aromatic Hydrocarbons (PAHs) by HPLC-UV (PDF 686kB)

.... The stationary phase incorporates a proprietary bonding and unique selectivity that baseline resolves key PAH : Acetonitrile Conc.: 10 μg/mL (ppm) Inj. Vol.: 5 μL Mobile Phase A: Water B: Acetonitrile tetrahydrofuran...

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

... stationary phase has been optimized to maximize resolution between critical pairs. In addition with higher efficiency give much better separation of compounds independent of stationary phase selectivity...

Restek Liquid Chromatography (LC) Columns - Usage & Care (PDF 143kB)

... is also governed by the stationary phase type. Hydrocarbon phases, such as C18, are relatively chemically for complete instructions on installing the column. Mobile Phase When shipped, the column contains...

Operating Hints for Using Split/Splitless Injectors (PDF 1212kB)

... part of solvent focusing is the ability of the solvent to “wet” the stationary phase in the column . Non-polar solvents should be used for splitless injections on non-polar stationary phases (e.g., use...

News: Impact of GC Parameters on the Separation Part 4: Choice of Film Thickness

Author(s): Jaap de Zeeuw Restek Corporation Published By: Separation Science Year of Publication: 2014 Link: http://www.sepscience.com/Information/Archive/All-Articles/3488-/Impact-of-GC-Parameters-on-The-Separation—Part-4-Choice-of-Film-Thickness Abstract: In parts 1, 2, and 3 of this series, we focused on the selection of stationary phase, column length, and internal diameter. The stationary … Continue reading

Extending the Power of Stabilized PLOT Column Technology to Process GC Analyzers (PDF 750kB)

... times. In addition, because less stationary phase is lost, retention times are more stable over and the spiking observed in each analytical run was used as an indicator of particle generation or phase...

Minimizing Decomposition of Components during GC Analysis (PDF 1319kB)

... on the amount of stationary phase (film thickness). Use a 0.10 μm film instead of a 0.25 μm one. Use a 0.32 mm i chromatography is performed under conditions where the components to separated are in the gas phase. We use...

Rxi-5Sil MS: Exceptionally Inert Columns for GC/MS and Trace-Level Analyses (PDF 995kB)

.... • Temperature range: -60 °C to 350 °C. The Rxi-5Sil MS stationary phase incorporates phenyl groups (called in performance compared to other columns of similar phase. The technology used to produce these columns results...

Optimize Analysis of Polar and Coeluting VOCs in Whole Air Canister Samples Using an Rtx-VMS GC Column

... of stationary phase and column dimensions. In regards to chromatographic column selection, section 7 -, and VMS-type phases in 30 m column formats for the 65 most commonly analyzed whole air VOCs ... to reduce analysis times and stationary phases that separate difficult coelutions can be selected. After...

Increase Productivity for Dioxin and Furan Analysis with Rtx-Dioxin2 GC Columns (PDF 931kB)

... difficult on almost all stationary phases. Most labs address this by initially analyzing samples on a 5 % diphenyl column and then using a cyano phase, such as a DB-225, SP-2330, or SP-2331 column...

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

... of increasing polarity) • Wide range of stationary phases offers orthogonal separations. • High thermal , and detectors. Phase Length ID df temp. limits cat.# Rxi-1ms 30 m 0.25 mm 0.25 μm -60 to 330/350 °C...

Restek's PLOT Column Family (PDF 3255kB)

... of the aluminum oxide stationary phase is minimized, by deactivation with inorganic salts like KCl or Na2SO4 proprietary stationary phases. By fully managing our production streams, we are able to ensure unparalleled...

PLOT Columns Instruction Sheet (PDF 405kB)

....25 mm ID fused silica tubing coated with 0.25-0.50 μm of a nonpolar stationary phase, such as Rtx-1 phase). Use a connector suitable for MS application. • If the PLOT column will be connected to a non...

Rxi GC Columns Sales Sheet (PDF 3173kB)

..., and hydrocarbons. • Temperature range: -60 °C to 350 °C. The Rxi-5Sil MS stationary phase incorporates phenyl samples. GCxGC involves two columns with differing stationary phase selectivity (orthogonal...

The Role of Selectivity in Liquid Chromatography Method Development

..., a capacity factor is the ratio of the amount of time an analyte spends in the stationary phase to the amount eluting analyte spends in the stationary phase relative to that of the earlier eluting analyte. While...

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)

... compounds and isobaric interferences was optimized on a high-phenyl stationary phase using both GC that is selective for the highly aromatic PAHs. Due to the selectivity of the column stationary phase...

All Matrix Interferences Resolved (PDF 1706kB)

...www.restek.com 1 Stationary Phase: EtG/EtS Pure Chromatography www.restek.com/raptor Selectivity : Proprietary USP Phase Code: NA Phase Category: Proprietary Ligand Type: Proprietary Recommended Usage...

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 [...]

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

... in the Pro EZGC Modeler Lets You Try before Buying Numerous GC column stationary phases have been developed chromatogram that matches real-world results? Our examples span a variety of chemical classes and column phases...

Influencing Selectivity in LC-MS Peptides Analysis on the Raptor ARC-18 Column (PDF 989kB)

... because the stationary phase ligand is sterically protected, making it extremely stable and resistant Carroll Figure 1: Raptor ARC-18 LC Column Properties. Si O Stationary Phase Category: C18...

Rt-2560 Columns Ensure Accurate, Reliable AOAC 996.06 and AOCS Ce 1j-07 FAMEs Analysis (PDF 2761kB)

... and food products. Its highly polar biscyanopropyl stationary phase and long column format make column with a highly polar biscyanopropyl stationary phase, such as the Rt-2560. The column must be able...

Roc HPLC Columns: The Reliable Cornerstone for Your LC Lab (PDF 2233kB)

...3 Stationary Phase Category C18, octadecylsilane C8, octylsilane phenyl cyano bare silica Ligand (USP Monograph 38, Ethinyl Estradiol) All columns are C18 stationary phase (5 µm, 150 x 4.6 mm...

Ultra-Low Bleed Columns Improve Trace-Level Analysis

... Rxi Columns Minimize Noise, Maximize S/N Ratios All Rxi stationary phases are surface 1). Several types of stabilization groups can be used for minimizing stationary phase bleed...

Why do smaller particle size columns improve resolution? Learning Links

... and stationary phases. Efficiency is a qualitative term used to measure the number of theoretical plates in a given column, or the degree to which an analyte partitions between the mobile and stationary phases...

Raptor FluoroPhenyl LC Columns Brochure (PDF 3042kB)

...Stationary Phase: FluoroPhenyl Get the Power of HILIC and RP Modes in One LC Column Selectivity exchange Complementary Solute Interactions: • Polarizability • Dispersion Stationary Phase Category...

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

...Stationary Phase: ARC-18 Si O Selectivity Accelerated Pure Chromatography www Acidic Basic 0 2 4 6 8 10 Stationary Phase Category: C18, octadecylsilane (L1) Ligand Type...

The "Replacement" Column A Recurring Problem in Gas Chromatography

... and the degree of change are unique functions of that solute in that stationary phase under these particular those molecules are in the mobile phase, and endure only while they are in contact with the stationary...

1s 5s & Waxes

1's 5's & Waxes

Detailed Hydrocarbon Analysis (DHA) Featuring Rtx-DHA Columns-PCSS1007D-UNV

Rtx-DHA columns are ideal for Detailed Hydrocarbon Analysis (DHA) methods and easily meet or exceed both ASTM D6730-01 and Canadian General Standards Board CAN/CGSB 3.0 No. 14.3-99 requirements. Every Rtx-DHA column is tested for retention, efficiency, stationary phase selectivity, and bleed—guaranteeing reproducible column-to-column performance.

Novel Column Chemistry—High Impact, Low Cost Technology

... needed to make column stationary phase obsolete. At this juncture, the column is still an integral part % employ phenyl stationary phases.[1] The main advantage of phenyl phases—and the reason...

Restek Advantage, 2012.1 (PDF 14846kB)

... available with just four stationary phases. It simplifies column choice for fast, effective method all four USLC stationary phases in one convenient package. Available for UHPLC (1.9 μm) and HPLC (3...

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

.... A conventional C18 stationary phase separates compounds based mainly on their overall hydrophobicity. Considering the carbon to heteroatom ratio, this is an effective separation mechanism for NSAIDs. Newer stationary phases ... Non-steroidal anti-inflammatory drugs (NSAIDs) are typically separated on C18 phases. Separations and selectivity. Increased retention requires higher organic content in the mobile phase, increasing desolvation...

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

... lead to stationary phase overload, however, so it may be necessary to increase the capacity selective for all of them. As a result, this analysis is performed on a general-purpose stationary phase...

The Effects of LC Particle Choice on Column Performance: Raptor 1.8 µm Superficially Porous Particles (SPP) for UHPLC Analyses (PDF 878kB)

... with the selectivity of USLC technology, so you get the separating power of Restek’s stationary phases combined /mL total BSA concentration before digestion Inj. Vol.: 10 μL Mobile Phase A: 0.1% Trifluoroacetic acid...

Analyze Trace Polar Hydrocarbons More Accurately and Reliably With New Alumina BOND/MAPD PLOT Columns! (PDF 2703kB)

... in the petrochemical industry. Adsorption chromatography using alumina stationary phases has proven to be very and Response In gas-solid chromatography, phase overload produces tailing peaks, an issue that is further...

Liner Anatomy Bench Companion (PDF 2522kB)

...-3 m length of 0.53 mm deactivated capillary tubing without stationary phase) is necessary. For PTV...

Fast, Simple LC-MS/MS Analysis of Creatine and Creatinine (PDF 568kB)

... Characteristics: Stationary Phase Category: bare silica (L3) Ligand Type: none Particle: 2.7 μm superficially method, no complex mobile phases. • Fast, 1.5 min analysis without additional equilibration time...

5.5 Minute LC-MS/MS Analysis of Mycotoxins in Peanut Powder (PDF 945kB)

..., the selectivity of the Biphenyl stationary phase, and the efficiency of 2.7 μm Raptor superficially porous containing isobaric mycotoxins with similar structures, the Raptor FluoroPhenyl phase may be necessary...

Detailed Hydrocarbon Analaysis (DHA) Featuring Rtx-DHA Columns (PDF 3950kB)

...-butanol skewness = 1.25). We test every Rtx-DHA-100 column for retention (k'), efficiency (n), stationary phase recommends a 100 m x 0.25 mm ID capillary column coated with 0.5 μm of 100% dimethyl polysiloxane stationary...

Raptor C18 LC Columns Brochure (PDF 2375kB)

...Stationary Phase: C18 Si TMS O TMS Selectivity Accelerated Pure Chromatography www Functionalities: • Hydrophobic compounds Solute Retention Profile: Stationary Phase Category: C18...

Fast, Optimized GC Purge-and-Trap Analysis of Volatiles for Soil and Water Methods (PDF 1024kB)

.../dimethyl polysiloxane stationary phases. However, resolution of gases has always been problematic with these columns features a stationary phase that is selective for VOCs, a film thickness sufficient to retain and resolve...

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

... columns with differing stationary phase selectivity (orthogonal) that are press-fitted together available commercially. • Wide range of stationary phases offers orthogonal separations. • High thermal...

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

... is the best tactic for analyzing glycols in water because PEG stationary phases offer unique selectivity a splitless injection with a polydimethylsiloxane (PDMS) phase column. These problems can prevent analysts...

Determination of Omega-3 (n-3) and Omega-6 (n-6) Fatty Acid Composition in Evening Primrose Oil, Flax Seed Oil, Black Currant Oil, and Borage Oil (PDF 1655kB)

... column contains a polyethylene glycol stationary phase, which is slightly more polar than the Stabilwax...

Column Choice: A Critical Factor for Successful UHPLC Integration

... the stationary phase is bonded. This does not indicate that all particles inside the column are of that specific is not large enough to ignore the importance of the chromatographic stationary phase. If we consider...

Featured Application: Derivatized Amphetamines on Rxi-5Sil MS Improved GC Analysis of Derivatized Amphetamines

... are extremely harsh and can reduce GC column lifetime by damaging the stationary phase. Phase damage usually be obtained by using a highly inert Rxi-5Sil MS column. The unique Rxi-5Sil MS stationary phase ... to the derivatization reagents. High inertness and enhanced stability result in good peak shape and response, low phase...

Retention Cross-over Phenomenon in Gas Chromatography — Can the Mystery be Revealed?

... functional groups on polar stationary phases. For example, we observed a reversal in the elution order important variables in GC (the other being of course the nature of the stationary phase). In partition GC...

ChromaBLOGraphy: What do Chromatograms tell us? Peak Shape .. Multiple Peaks for the Same Component

Chromatogram in fig. 1 show multiple peaks for one component. All the peaks indicated with a *  are identified as dichlobenil peaks.  Somehow multiple injection bands are formed during injection. See the work of Jack Cochran in: http://blog.restek.com/?p=556 In this case acetonitrile was used as the solvent. This is a polar solvent and when a [...]

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...

GC Columns Poster Package

... gradient charts for column stationary phase, film thickness, inner diameter, and length make it easy . Detailed discussion of the resolution equation and how it relates to column factors such as stationary...

Optimizing the Analysis of Volatile Organic Compounds (PDF 2705kB)

... Column Phases 21 Metal Columns22 Detection Systems23 Column Configurations 23 Detector Configurations23 and equilibrium is established between the concentration of the compounds in the vapor phase and in the liquid...

Using Guard Columns and Retention Gaps in GC (Part 1)

... into the analytical column. By applying a “segment” coating technology the stationary phase can the injection band width. Additionally, when nonbonded stationary phases are used, the direct contact...

Analysis of Brominated Flame Retardants by Liquid Chromatography Mass Spectrometry

... stationary phases. HBCD is one of the most widely used BFRs with production globally in excess of 20,000 tons stationary phases to be coupled with the sensitivity and specificity of state-of-the-art mass spectrometers...

Using Guard Columns and Retention Gaps in GC (Part 2)

... into the analytical column tubing. By applying a "segment" coating technology the stationary phase can be deposited … all these compounds can interfere with the stationary phase and they will influence the separation...

ChromaBLOGraphy: Why do porous polymer PLOT columns bleed more than Liquid phases?

Sometimes we get customer reaction that porous polymer PLOT columns bleed a lot. They are used to the low bleed values using Rxi-series of columns and wonder why this is not the case with porous polymers. Porous polymer columns have a huge amount of stationary phase to generate sufficient loadability and retention. Typically porous layers [...]

News: New GC Column Separates all EFSA PAH4 Priority Compounds

Restek has developed a GC column specifically for the analysis of polycyclic aromatic hydrocarbons (PAHs) in food safety and environmental samples. The new Rxi®-PAH column features a higher phenyl-content stationary phase that provides a unique selectivity to separate important PAHs … Continue reading

ChromaBLOGraphy: Can Column Bleed also be a “Good” Thing?

We see all kind of developments in GC technology to stabilize stationary phases and to make GC columns that bleed as low as possible. A question I asked myself: Is it really always advantageous to have low bleed? I sure understand that low bleed will get us highest signal-to-noise.  And if we combine that with [...]

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

... contain alkyl stationary phases that separate compounds primarily through dispersive interactions be separated based on their hydrophobicity. In contrast, Restek’s FluoroPhenyl stationary phase operates ... they incorporate multiple retention mechanisms and can be used in both reversed-phase (RP) and HILIC modes...

A Technical Guide for Static Headspace Analysis Using GC (PDF 6234kB)

... column stationary phases fail to provide adequate resolution of all the components commonly tested during stationary phases to meet all of these requirements—the Rtx-BAC1 and the Rtx-BAC2 columns. Quantitation...

Gas Management Supplies for GC Labs (PDF 5122kB)

... stationary phase bleed. Clean fuel gases and make-up gases are also essential for stable detector baselines stationary phase bleed. Contaminants cause ghost peaks to appear during temperature programming and degrade...

High-Resolution GC Analyses of Fatty Acid Methyl Esters (FAMEs) (PDF 2766kB)

... Analyzing Polyunsaturated FAMEs The FAMEWAX polyethylene glycol stationary phase is specially tested to resolve the individual components. Capillary columns with Carbowax-type (polyethylene glycol) stationary...

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

... The innovative Biphenyl is Restek's most popular LC stationary phase because it is particularly adept detection. Raptor Biphenyl LC Columns (USP L11) Column Characteristics: Stationary Phase Category: Phenyl...

ChromaBLOGraphy: Separating EU-PAH’s in food: chrysene-triphenylene and benzo fluoranthenes

As Jack pointed out in his latest blog there is a huge interest in PAH analysis. using QuEChers techniques, the sample preparation can be greatly simplified. The other side is the GC-Separation of PAH.  For components like chrysene and triphenlylene, MS deconvolution will not help. The same for the 3 benzofluoranthenes. Selective stationary phases will [...]

ChromaBLOGraphy: Restek Icon Dr. Frank Dorman moves into a new career in education

Last symposium in Rival del Garda, Italy, we had the opportunity to say good bye to a mutual friend and well respected colleague, Frank Dorman.  Frank has been working for a long time at Restek corporation and was the roots for developing highly selective stationary phases for GC and LC using modeling techniques. After the [...]

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

... separation is still important to ensure the highest quality data. Conventional C18 stationary phases , the analysis of more than 280 pesticides using the 3μm Ultra Aqueous C18 is shown. Optimized stationary phase...

News: Get Selective

Author(s): Jaap de Zeeuw Restek Corporation Published By: The Analytical Scientist Issue: 0713 Year of Publication: 2013 Link: http://theanalyticalscientist.com/issues/0713/get-selective/ Abstract: Modern narrow bore columns have made chromatographers lazy when it comes to stationary phase selection. Here’s how getting back to … Continue reading

News: Impact of GC Parameters on the Separation Part 2: Choice of Column Internal Diameter

Author(s): Jaap de Zeeuw Restek Corporation Published By: Separation Science Issue: vol. 6, issue 4 Year of Publication: 2014 Link: http://www.sepscience.com/Information/Archive/All-Articles/3351-/Impact-of-GC-Parameters-on-The-Separation-Part-2-Choice-of-Column-Internal-Diameter For the full print issue, visit http://www.sepscience.com/docs/Bespoke/Editions/SepSci/SepSci_0714.pdf Abstract: In Part 1 of this series, we focused on how to select the … Continue reading

Sensitive GC/MS Analysis for Drugs of Abuse 1ng Limit of Detection for Acidic/Neutral or Basic Drugs on New Rxi-5ms Column

... New stationary phase, inert to acidic or basic drugs. Unique deactivation generate are accepted as confirming evidence in courts of law. The accepted stationary phase...

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

... phase than for the hydrophobic C18 stationary phase. However, using a low organic mobile phase periods, and decreasing retention over time. More significantly, a conventional C18 stationary phase...

ChromaBLOGraphy: Capillary GC Column Killers – Part 2

For my second installment of Capillary GC Column Killers, I am going to discuss derivatization reagents.  If you haven’t already read my first installment which covered the topic of a “safe” pH range, I encourage you to do so.   http://blog.restek.com/?p=5001 Derivatization Reagents Derivatization reagents are commonly used in gas chromatography to convert non-volatile compounds into volatile [...]

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