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Key features:
Specialized Columns for Mixed Polar and Nonpolar Compounds.
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.
Restek's new line of fused silica capillary GC columns - Rxi® columns - is now available!
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.
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!
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.
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.
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.
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.
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.
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
• 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.
• 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.
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.
