Products & ReviewSeparations

Ultra Selective Liquid Chromatography™

Name: Ultra Selective Liquid Chromatography™
Rating: 4 (1 reviews)

Reversed Phase Method Development that's Simple, Fast, Effective, and Universal!•Boasts the widest range of reversed phase selectivity in the industry.•Simplifies column selection down to 4 unique stationary phases.•Employs orthogonal selectivity to speed up effective method development.•Maximizes efficacy of your column screening systems.•Fits any HPLC or UHPLC instrumentation. Restek Ultra Selective Liquid Chromatography™ (…

4.0/5.0

|1 Review|Write your own Review

Request Pricing

Receive your quote directly from the manufacturer.

Reviews

Average Rating 4.0

|1Scientists have reviewed this product

Ease of Use

After Sales Service

Value for Money

Write your own review

Good quality product

Average Rating 4.0

Application Area:

Analysis of GC chromatography

We have had this product for many years and it has helped me to good achieve results.

Review Date: 12 Apr 2019 | Restek Corp.

Reversed Phase Method Development that's Simple, Fast, Effective, and Universal!

•Boasts the widest range of reversed phase selectivity in the industry.
•Simplifies column selection down to 4 unique stationary phases.
•Employs orthogonal selectivity to speed up effective method development.
•Maximizes efficacy of your column screening systems.
•Fits any HPLC or UHPLC instrumentation.

Restek Ultra Selective Liquid Chromatography™ (USLC™) technology is the directed application of selectivity—the most influential factor affecting resolution—to optimize separations and improve method performance. Restek has extensively studied reversed phase selectivity, and as a result, we offer chromatographers the most effective and widest range of USLC™ stationary phase chemistries in the industry!

Pinnacle® DB columns (1.9 µm) feature base deactivated silica and are recommended for scalable UHPLC and HPLC analyses. Ultra columns (3 and 5 µm) use highest purity silica and are well suited for traditional HPLC analyses. Viva columns incorporate wide pore silica, making them ideal for large-molecule biological separations using HPLC.

Application NoteFood and Beverage

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

The analysis of antibiotic residues in food-producing animals is important worldwide for evaluating food safety and maintaining compliance with export regulations. Sulfonamides are a specific concern, as drugs in this antibiotic class are commonly used in feed additives for livestock in order to fight infections and maintain desired growth levels. In this application note, the unique selectivity and high retention of biphenyl columns produce complete separations and benefit both UV and MS detection. In addition, biphenyl columns in a UHPLC format allow faster sample throughput, while maintaining good separation of target compounds.

31 Dec 2014

Product NewsSeparations

New Raptor™ FluoroPhenyl Phase: the Power of HILIC and RP Modes in One LC Column

Restek’s new Raptor™ FluoroPhenyl Phase combines the speed of superficially porous particles with the resolution of highly selective USLC® technology

21 Dec 2015

Product NewsSeparations

New Column Toolbox Simplifying your LC Methods

27 Mar 2012

Product Overview

Ultra Selective Liquid Chromatography™

Restek Corp.

4.0/5.0

|1 Review

Request Pricing

Links

Restek Corp.Manufacturer Website

Featured products

Request Quote for All Products

Ultra IBD, 3 µm, 100 x 2.1 mm HPLC column
Restek Corp.
Specialized Columns for Mixed Polar and Nonpolar Compounds.
(0)
Stabilwax® (Fused Silica)
Restek Corp.
General purpose columns for FAMEs, flavor compounds, essential oils, solvents, xylene isomers, and US EPA Method 603 (acrolein/acrylonitrile). Resistant to oxidative damage. Temperature range: 40°C to 260°C. Equivalent to USP G14, G15, G16, G20, and G39 phases. The polar-deactivated surface tightly binds the Carbowax® polymer and increases thermal stability, relative to competitive columns.
(16)
Rxi®-5HT (Fused Silica) GC columns
Restek Corp.
Restek's new line of fused silica capillary GC columns - Rxi® columns - is now available!
(11)
Rxi®-1HT
Restek Corp.
3-IN-1 TECHNOLOGY with Rxi® columns
(1)
Rxi®-624Sil MS (Fused Silica) GC columns
Restek Corp.
Rxi® fused silica capillary GC columns were designed specifically to be the best columns available, for exceptional inertness, ultra-low bleed, and reproducible retention and selectivity.
(19)
Rxi®-17 (Fused Silica) GC columns
Restek Corp.
Restek's former Rtx®-17 columns are now manufactured using new Rxi® column technology--for unsurpassed inertness, ultra-low bleed, guaranteed reproducibility, and unmatched performance!
(5)
Q-sep™ QuEChERS Tubes
Restek Corp.
Q-sep™ QuEChERS Tubes for Pesticide Residue Analysis • Fast, simple sample extraction and cleanup using dSPE. • Fourfold increases in sample throughput. • Fourfold decreases in material cost. • Convenient, ready to use centrifuge tubes with ultra pure, preweighed adsorbent mixes. Quick, Easy, Cheap, Effective, Rugged, and Safe, the QuEChERS ("catchers") method, developed by the USDA Eastern Regional Research Center, has become very popular for extraction and clean-up of pesticide residue samples. Our products are available in three centrifuge tube sizes to meet the needs of both extraction and cleanup of a wide variety of sample matrices following various methods. The researchers developed a simple two-step procedure. First, the homogenized samples are extracted and partitioned, using an organic solvent and salt solution. Then, the supernatant is further extracted and cleaned, using a dispersive SPE technique. Multiple adsorbents are placed in a centrifuge tube, along with the 1mL of organic solvent and the extracted residues partitioned from step 1. The contents are thoroughly mixed, then centrifuged, producing a clean extract ready for a variety of GC or HPLC analytical techniques. Validation and proficiency data for the QuEChERS method are available for a wide variety of pesticides in several common food matrices on their website.
(1)
Rxi®-5Sil MS (Fused Silica) Columns
Restek Corp.
Rxi® fused silica capillary GC columns were designed specifically to be the best columns available, for exceptional inertness, ultra-low bleed, and reproducible retention and selectivity.
(27)
Flip Seal Dual Vespel® Ring Inlet Seals
Restek Corp.
Reversible Flip Seal—Same Cost, Twice the Lifetime New reversible Flip Seal inlet seals from Restek last twice as long as other inlet seals. Simply use—flip—then use again. The reversible design doubles the number of analyses you get per seal. •Same easy sealing as Dual Vespel® Ring Inlet Seals—no extra washer needed. •Lower leak rate than OEM metal seals. •Maximum transfer of analytes to column, due to highly inert gold or Siltek® surface.
(0)
Rtx®-1 Columns
Restek Corp.
Rtx®-1 columns exhibit long lifetime and very low bleed at high operating temperatures. A proprietary synthesis process eliminates residual catalysts that could cause degradation and increase bleed.
(10)
Ultra Aqueous C18 Columns
Restek Corp.
The Ultra line represents Restek’s broadest selection of stationary phases on a single silica support. Made of high-purity, type-B silica that minimizes activity and creates high-density bonding, these columns are designed for selective and reliable HPLC applications.The Ultra Aqueous C18 HPLC column provides reproducible retention times and can be used with highly aqueous mobile phases, which may eliminate the need for sample derivitization or ion pairing reagents. This column features a true C18 alkyl bonded phase, meeting the requirements of a US Pharmacopoeia (USP) L1 stationary phase.The Ultra Aqueous C18 column uses a novel bonding chemistry that results in polar groups at the silica surface. These surface polar groups keep the alkyl stationary phase extended, and thus wetted by the mobile phase—even when using up to 100% aqueous mobile phases.Additionally, although the Ultra Aqueous C18 column behaves similarly to a traditional base-deactivated C18 column when analyzing neutral hydrophobic compounds, it has enhanced retention and unique selectivity for polar and basic compounds.Ultra Aqueous C18 Columns Features: Analyzes polar compounds by reversed phase. Retains compounds such as amino acids and water soluble vitamins using simple mobile phases and without derivitization. Analyzes polar, hydrophillic materials without retention time loss. Stable retention in 100% aqueous mobile phases. Can analyze compounds that are sparingly soluble in organic solvents. True C18 alkyl bonded phase. High-density C18 ligand coverage. Similar selectivity as traditional C18 phases for neutral hydrophobic compounds. Unique secondary polar characteristics. End-capping diminishes peak tailing observed from exposed silanol sites on the silica surface. Column Characteristics: Phase: C18 particle Size: 3, 5 μm Pore Size: 100 Å Length: 30, 50, 100, 150, 200, 250 mm ID: 0.3, 1.0, 2.1, 3.0, 3.2, 4.6 mm
(12)
Resprep® Resin SPE Disk
Restek Corp.
• 47 mm glass fiber disks embedded with styrene/DVB resin. • For chlorinated, benzidine-containing, or nitrogen-containing pesticides. • Meet requirements of EPA Methods 515.2 and 553.
(2)
GCxGC Columns
Restek Corp.
• Wide range of stationary phases offers orthogonal separations. • High thermal stability maximizes system ruggedness and sensitivity. • Unrivaled column inertness for accurate analysis of active compounds. • 0.15, 0.18, and 0.25 mm ID formats accommodate varying sample capacities, speeds, and detectors. • Secondary columns come in convenient 2 m lengths for economical method development. GCxGC is a powerful multidimensional GC technique that combines two independent separations to accurately analyze highly complex samples. GCxGC involves two columns with differing (orthogonal) stationary phases that are press-fitted together in series and separated by a modulator. The first (primary) column performs a separation, and its effluent is continually focused and “injected” by the modulator onto the second (secondary) column, where another separation occurs. By choosing a secondary column that is orthogonal to the primary column, it is possible to identify analytes that cannot be separated by the primary column. And by keeping the secondary column short, it is possible to maintain the separation produced by the primary column. Results generated through a series of high-speed chromatograms are plotted as a retention plane, or contour plot (column 1 time x column 2 time). Restek has been performing comprehensive two-dimensional gas chromatography since its commercial inception. Our innovations lab boasts multiple instruments dedicated to GCxGC applications, and we are continually exploring new application areas—including environmental, food safety, petroleum, forensics, fragrance, natural products, and dietary supplements. Restek GCxGC secondary columns can be matched with any Restek Rtx® or Rxi® primary column to create the perfect orthogonal separation for your application.
(2)
Rtx®-BAC Plus 2 Columns (fused silica)
Restek Corp.
Optimized column selectivities guarantee resolution of ethanol, internal standards, and frequently encountered interferences. Robust and reproducible column chemistry ensures longer column lifetime and consistent results. 2 minute analysis time increases lab productivity. Stable to 260 °C Don’t forget: Blood alcohol analysis requires dual column confirmation when using GC/FID.
(2)
Rtx®-BAC Plus 1 Columns (fused silica)
Restek Corp.
Optimized column selectivities guarantee resolution of ethanol, internal standards, and frequently encountered interferences. Robust and reproducible column chemistry ensures longer column lifetime and consistent results. 2 minute analysis time increases lab productivity. Stable to 260 °C Don’t forget: Blood alcohol analysis requires dual column confirmation when using GC/FID.
(2)

Ultra Aqueous C18 Columns

Restek Corp.

The Ultra line represents Restek’s broadest selection of stationary phases on a single silica support. Made of high-purity, type-B silica that minimizes activity and creates high-density bonding, these columns are designed for selective and reliable HPLC applications.The Ultra Aqueous C18 HPLC column provides reproducible retention times and can be used with highly aqueous mobile phases, which may eliminate the need for sample derivitization or ion pairing reagents. This column features a true C18 alkyl bonded phase, meeting the requirements of a US Pharmacopoeia (USP) L1 stationary phase.The Ultra Aqueous C18 column uses a novel bonding chemistry that results in polar groups at the silica surface. These surface polar groups keep the alkyl stationary phase extended, and thus wetted by the mobile phase—even when using up to 100% aqueous mobile phases.Additionally, although the Ultra Aqueous C18 column behaves similarly to a traditional base-deactivated C18 column when analyzing neutral hydrophobic compounds, it has enhanced retention and unique selectivity for polar and basic compounds.Ultra Aqueous C18 Columns Features: Analyzes polar compounds by reversed phase. Retains compounds such as amino acids and water soluble vitamins using simple mobile phases and without derivitization. Analyzes polar, hydrophillic materials without retention time loss. Stable retention in 100% aqueous mobile phases. Can analyze compounds that are sparingly soluble in organic solvents. True C18 alkyl bonded phase. High-density C18 ligand coverage. Similar selectivity as traditional C18 phases for neutral hydrophobic compounds. Unique secondary polar characteristics. End-capping diminishes peak tailing observed from exposed silanol sites on the silica surface. Column Characteristics: Phase: C18 particle Size: 3, 5 μm Pore Size: 100 Å Length: 30, 50, 100, 150, 200, 250 mm ID: 0.3, 1.0, 2.1, 3.0, 3.2, 4.6 mm

(12)

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

New Raptor™ FluoroPhenyl Phase: the Power of HILIC and RP Modes in One LC Column

New Column Toolbox Simplifying your LC Methods

Product Overview

Ultra Selective Liquid Chromatography™

Links

Featured products

Ultra IBD, 3 µm, 100 x 2.1 mm HPLC column

Stabilwax® (Fused Silica)

Rxi®-5HT (Fused Silica) GC columns

Rxi®-1HT

Rxi®-624Sil MS (Fused Silica) GC columns

Rxi®-17 (Fused Silica) GC columns

Q-sep™ QuEChERS Tubes

Rxi®-5Sil MS (Fused Silica) Columns

Flip Seal Dual Vespel® Ring Inlet Seals

Rtx®-1 Columns

Ultra Aqueous C18 Columns

Resprep® Resin SPE Disk

GCxGC Columns

Rtx®-BAC Plus 2 Columns (fused silica)

Rtx®-BAC Plus 1 Columns (fused silica)

Ultra IBD, 3 µm, 100 x 2.1 mm HPLC column

Stabilwax® (Fused Silica)

Rxi®-5HT (Fused Silica) GC columns

Rxi®-1HT

Rxi®-624Sil MS (Fused Silica) GC columns

Rxi®-17 (Fused Silica) GC columns

Q-sep™ QuEChERS Tubes

Rxi®-5Sil MS (Fused Silica) Columns

Flip Seal Dual Vespel® Ring Inlet Seals

Rtx®-1 Columns

Ultra Aqueous C18 Columns

Resprep® Resin SPE Disk

GCxGC Columns

Rtx®-BAC Plus 2 Columns (fused silica)

Rtx®-BAC Plus 1 Columns (fused silica)