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What is derivatization and how can is improve your analyses? This note describes the advantages of derivatization and explains how to choose the correct reagent. Includes product information and an overview of silylation, acylation, and alkylation.
Parker Balston® Hydrogen Generators produce 99.9995% pure hydrogen from deionized water, without liquid electrolytes, and are a safe, cost-effective alternative to gas cylinders. Replace inconvenient, costly, hazardous cylinders with these state-of-the-art systems—the most reliable hydrogen generators on the market. This 2-page note includes specifications for all models available from Restek. All models are built to meet CSA, UL, cUL, and CE Mark standards.
Same performance as XAD®-2 for air sampling!
Ultra-Clean resin is cleaned to meet or exceed US EPA Method TO-13 requirements for a sampling medium for airborne semivolatiles. Specifications and performance are equal to those of XAD®-2 resin, the standard for this purpose. Zero background for electroconductivity detection. The 2-page note details the material’s features and benefits.
High-quality ChemService pesticides / outstanding Restek service The ChemService product line of pesticides and pesticide metabolite reference materials is renowned for comprehensiveness and high quality. This line of more than 1,000 products is available from Restek. Example materials and recommended capillary GC columns are listed in this 2-page note; for the complete list of pesticides and metabolites, visit our website.
Calibration mixes described in this 4-page note include the compounds most commonly monitored by US EPA Method 8260B. Mixes have been formulated to couple maximum stability with convenience. Surrogates, internal standards, and other QA mixes are included.
Calibration mixes described in this 4-page note include the compounds most commonly monitored by US EPA Method 8270D/8270C. Mixes have been formulated to couple maximum stability with convenience. Surrogates, internal standards, and other QA mixes are included.
To meet the needs of analysts monitoring low molecular weight aldehydes and ketones, Restek offers reference mixes of US EPA Compendium Method TO-11A and Method 8315 target compounds, in concentrations appropriate for most ambient air work. An Allure® AK HPLC column resolves 13 carbonyls in less than 13 minutes. This 2-page publication describes the reference mixes and illustrates the analysis.
Identification of cocaine adulterants plays a critical role in identifying sources, dealers, and routes of drug distribution. Both GC and LC methods can be used to “fingerprint” cocaine samples. Here we show the analysis of simulated cocaine samples by both techniques and give column and instrument conditions for successful analysis.
Ultra-high pressure liquid chromatography (UHPLC) can significantly increase efficiency and produce faster separations. The small particle sizes used in UHPLC improve efficiency; however selectivity is still the most important factor affecting compound resolution. Here we demonstrate the importance of stationary phase choice in UHPLC separations. By optimizing selectivity for your analytes of interest, faster separations can be achieved without compromising resolution.
Pathways in semiconductor process systems require high corrosion resistance, low moisture content, and high purity. Restek Performance Coatings significantly outperform the untreated stainless steel that is commonly used in the industry. Silcosteel®-CR treatment improves corrosion resistance by an order of magnitude, Siltek® treated tubing reduces dry-down time by 50%, and Silcosteel®-UHV improves chamber productivity by 2.5x or more. These treatments offer significant savings of time and money.
Tetracycline antibiotics are extensively used in both humans and animals and the high demand for their use requires significant production capabilities. The large number of assays required for lot release and stability testing put a premium on method ruggedness and efficiency. Here we evaluate the selectivity and system suitability performance of several HPLC columns. Allure® Biphenyl, Allure® PFP Propyl, and Ultra C18 columns all showed excellent repeatability. The Allure® Biphenyl column showed the greatest selectivity and peak symmetry, while the Allure® PFP Propyl column demonstrated the highest retention.
Analyses: MXT®-1HT Sim Dist
Low bleed and long-term stability under demanding conditions
ASTM Method D-6352, a simulated distillation of petroleum distillates, requires a capillary column compatible with oven temperatures to 430°C. At temperatures above 380C, polyimide-coated fused silica becomes brittle, and column lives are very short. MXT®-1 HT Sim Dist columns combine the inertness of fused silica and durability of stainless steel, to meet all criteria in the method. Data for a series of 400 injections at 430C affirm the low-bleed, long-lifetime characteristics of this column.
Molecular sieves have been used for separating light gases since the 1950s, but by improving batch-to-batch uniformity, and packing these improved materials in inert Silcosteel®-treated tubing, Restek optimizes molecular sieve 5A and 13X columns for trace analyses, including difficult analytes like oxygen and carbon monoxide. Example chromatograms in this 2-page note show sharp, symmetric peaks for permanent gases.
Res-Sil™ support is an excellent replacement for discontinued Poracil® C. Stringent testing of the bonded packing ensures reproducible separations and retention times for C1-C5 hydrocarbons, including difficult-to-separate saturated and unsaturated C4 compounds, without interference from column bleed. Example chromatograms and analytical conditions are included in the 2-page note.
MXT®-1 Sim Dist and MXT®-500 Sim Dist columns combine the inertness of fused silica with the durability of stainless steel, meeting all ASTM Method D6352 (petroleum simulated distillation) criteria. MXT®-500 Sim Dist columns have lower bleed and longer lifetimes, but calculated boiling points for aromatics are higher (closer to true values); MXT®-1 Sim Dist columns offer polarity that matches published data. Includes chromatograms.
ASTM D-2887-01a is used to monitor petroleum products, excluding gasoline, with final boiling points of less than 538C. Relative to other alternatives, stainless steel MXT®-2887 columns and fused silica Rtx®-2887 columns offer lower bleed, shorter conditioning times, shorter analysis times, and longer column lifetimes. Column dimensions, liquid phase, and film thickness are optimized for the ASTM method.
The stationary phase in Rtx®-1 Sim Dist columns is bonded to a highly deactivated silica support, ensuring inertness, stability, and column lifetime characteristics superior to those of conventional packed columns used for Sim Dist analysis (ASTM Methods D2887, D3710). Data and chromatography in this 4-page note show that Rtx®-1 Sim Dist columns should be the packed columns of choice for this application.
Two methods are used to quantify individual alcohols and ethers in gasoline: a single column OFID method (e.g., ASTM Method D5599-94) and dual-column ASTM Method D4815-93. Restek offers columns, standards, and accessories to support both approaches.
Siltek®/Sulfinert® surface treatments improve component performance by significantly reducing corrosion and adsorption problems in the sampling and sample transfer pathways. These treatments improve sampling accuracy, increase component lifetime, and cost less than super alloys. Treatments can be applied to cylinders, valves, fittings, tubing and more, and demonstrably improve detection of low-level sulfur, nitric oxide, and mercury compounds in a wide variety of applications and industries.
Restek Performance Coatings offer a family of surface treatments that minimize reactivity and corrosion in a wide variety of applications — from petrochemicals, to environmental samples, to sampling and process systems. Siltek® and Sulfinert® treatments are economical, versatile, and are available on stock tubing and fittings, or can be custom applied to your existing equipment. Our surface treatments outperform traditional stainless steel and are more economical than expensive specialty alloys.
Analyses of corticosteroids, contraceptive steroids, and endogenous steroid hormones show the primary separation mechanism of the Allure® Biphenyl phase — π-π interactions — provides markedly better selectivity, relative to a C18, cyano, or phenyl phase, for molecules that differ in the number or positions of double bonds in the steroid carbon framework. For saturated analytes the Allure® Biphenyl phase has retention and selectivity similar to a C18 phase, but superior to a phenyl phase.
This 20-page flyer provides solutions for popular environmental methods and includes chromatograms, technical tips, and recommended products. Both GC and LC methods for volatiles, semivolatiles, organochlorine pesticides & PCBs, volatile organic compounds in air, organophosphorus pesticides, carbamates, paraquat/diquat, PAHs, and explosives are included.
Short Abstract:
Chromatograms, technical tips, & products for popular GC & LC environmental methods. Focuses on volatiles, semivolatiles, organochlorine pesticides/PCBs, air sampling, organophosphorus pesticides, carbamates, paraquat/diquat, PAHs, and explosives.
Semivolatiles methods, such as EPA Method 8270, place stringent demands on gas chromatography (GC) columns. Here we demonstrate the performance of Rxi®-5Sil MS columns for semivolatiles analysis in terms of bleed, efficiency, and activity. Excellent sensitivity and resolution are seen, even for difficult PAHs such as benzo(b)fluoranthene & benzo(k)fluoranthene, and indeno(1,2,3-cd)pyrene and dibenzo(a,h)anthracene. Both basic and acidic compounds show good response even at low levels.
Short Abstract:
Rxi®-5Sil MS columns show excellent sensitivity and resolution for semivolatiles, even difficult PAHs such as benzo(b) & benzo(k)fluoranthene, and indeno(1,2,3-cd)pyrene & dibenzo(a,h)anthracene. Basic & acidic compounds show good low-level response.
The United States Pharmacopeia recently revised the general chapter on residual solvent analysis, USP <467>, to mirror the International Conference on Harmonization (ICH) guidelines for the identification, confirmation, and quantification of residual solvents. This revision, set to become effective July 1, 2008, replaces previous methods that were not consistent with the ICH guidelines. Here we provide an overview, chromatograms, and technical tips for successfully running the new procedure.
If you have concerns about analyzing reformulated fuels containing ethanol, our new two-column set is the solution—it completely resolves benzene from ethanol. The aromatic compounds, too, are fully resolved, and can easily be quantified, using sec-butanol as an internal standard. This robust column set is ready to use after only a 10 minute carrier gas purge at ambient temperature, followed by a 30 minute hold at 165°C.
The Rtx®-Dioxin2 column was designed with a unique selectivity for both 2,3,7,8-substituted dioxins and furans, and also offers excellent thermal stability. Data presented in this 4-page flyer demonstrate that this single column is an effective alternative to conventional two-column procedures which require a confirmation column to resolve coelutions of toxic and nontoxic congeners.
Our newest analytical reference materials are compiled in this 12-page publication.
Increasing sample throughput is an effective way to reduce operating costs for environmental labs. Here we introduce new film thicknesses for the Rtx®-CLPesticide and Rtx®-CLPesticide2 GC columns, optimized for complete separations and short analysis times. Using these new columns, all US EPA Method 8081 organochlorine pesticides are resolved in less than 9 minutes.
This 1/3-page card summarizes Restek’s high-performance automotive coatings. Silcosteel® coatings prevent heat discoloration, reduce carbon coking, improve corrosion resistance, and provide a beautiful, unique finish to your automotive parts.
Restek’s Dual Vespel® Ring inlet seal gives you a better seal with fewer parts. Here we demonstrate that the softer Vespel® material has a much lower leak rate than a conventional metal seal. Also, since less torque is required for installation, user variability is reduced. The pliable Vespel® material is less likely to damage an inlet than a metal seal, and will seal more readily to inlets that have existing nicks and dings.
This 4-page flyer describes Restek reference materials supporting volatiles analysis. Included are our MegaMix® calibration standards, surrogate standards, and internal standards. Features a handy chart for comparing compound lists from our formulations to your current mix. Restek reference materials are prepared in accordance with our ISO 9001:2000 registration and are designed to provide the most stable blends with the maximum number of target analytes.
This flyer provides product descriptions for essential air sampling products including Ultra-Clean resin, SDVB resin, Whatman QM-A Quartz Fiber filters, and precleaned, ready-to-use PUF plugs. A convenient sampling cartridge kit is also included.
This 4-page flyer describes Restek reference materials supporting semivolatiles analysis. Included are our MegaMix® calibration standards, surrogate standards, internal standards, and QA matrix spike mixes. Features a handy chart for comparing compound lists from our formulations to your current mix. Restek reference materials are prepared in accordance with our ISO 9001:2000 registration and are designed to provide the most stable blends with the maximum number of target analytes.
Reference materials prepared by controlled evaporation, to simulate fingerprints encountered in fire debris or environmental samples, are described in this 4-page note. Materials include weathered and unweathered unleaded gasoline, mineral spirits, kerosene, and diesel fuel #2. Weathered materials also can be custom-prepared.
This 8-page flyer from Restek focuses on Super-Clean™ gas filtration products which are designed to assure extremely high-purity gas for your chromatography system. Included are easy to use filters and filter kits which remove moisture, hydrocarbons, and oxygen assuring a reliable and high-purity gas output. Related accessories such as brackets, baseplates, and gas regulators also are presented.
Our surface passivation treatments provide chemical inertness, corrosion resistance, a barrier against coking and fouling. These treatments are used to improve results in industries as diverse as automotive performance, analytical chemistry, and semiconductors. This flyer provides a general overview of our performance coatings including Silcosteel®, Siltek®, Silcosteel®-AC, Silcosteel®-CR, Silcosteel®-UHV, and Sulfinert® and describes their different applications.
Restek offers hundreds of reference material formulations, and will custom-prepare other formulations you need, in packaging formats you request, from our extensive inventory of compounds. This 4-page publication describes the rigorous twelve-step process every Restek reference material is subjected to, from conception to final product, including long-term product stability testing.
Chromatography and data in this 24-page booklet show Rxi™ columns offer exceptional inertness to sub-nanogram amounts of acidic or basic active compounds, the lowest bleed of all columns evaluated, and guaranteed consistent column-to-column performance. Rxi™-1ms columns replace other nonpolar 100% dimethyl polysiloxane phase (USP G2) columns; Rxi™-5ms columns replace other nonpolar 5% diphenyl / 95% dimethyl polysiloxane phase (USP G27) columns.
High quality septa can prevent problems associated with septum bleed, coring, splitting, or adherence to fittings. All Restek septa are made from specially formulated silicone rubbers, for minimal bleed and easy puncturability. Precision molding, rather than die cutting, assures a precise and consistent fit. Choose IceBlue™, Thermolite®, or BTO® septa (max. temp. 250°C, 340°C, or 400°C, respectively) — or replace conventional septa in an Agilent GC with a Merlin Microseal™ mechanical septum.
Restek HPLC columns support environmental HPLC applications with rapid analysis times and effective analyte resolution. Sample turn-around can be 50% faster, or greater, than with alternative columns. In addition, we prepare analytical reference materials and sample preparation products for these applications. Analyses described in this 8-page publication include carbamates, carbonyls, explosives, paraquat/diquat, phenoxyacid herbicides, and polyaromatic hydrocarbons.
Rxi™ columns offer unsurpassed inertness to low-level acidic or basic compounds, ultra-low bleed, and guaranteed consistent column-to-column performance. Chromatography in this 4-page publication illustrates these characteristics. Rxi™-5ms columns replace other nonpolar 5% diphenyl / 95% dimethyl polysiloxane phase (USP G27) columns, and have an operating temperature range of -60°C to 330/350°C.
Restek extraction cell parts and consumables for ASE® sample extraction systems give original equipment performance at significant savings, relative to original manufacturer's prices. Specially polished extraction cell bodies assure easier cleaning. Exclusive Siltek® treated cell bodies, end caps, and frits provide the ultimate in surface inertness. 4 pages.
This 8-page brochure features the most needed consumable items for maintaining your Agilent, PerkinElmer, Shimadzu, Thermo Scientific, or Varian GC inlet system in peak performing order — inlet liners and O-rings, inlet seals, septa, septum nuts, and ferrules — plus useful tools.
A new polymer and a new manufacturing process greatly enhance the performance of Rtx®-5Sil MS columns (5% phenyl / 95% methyl phase) in analyses of semivolatile environmental compounds. Optimized column dimensions and low bleed provide exceptional resolution and linear MS responses in sub-20-minute analysis times. For on-column amounts as small as 1ng, response factors for basic or acidic compounds meet the requirements of US EPA methods. The 4-page publication includes example chromatograms.
This 56-page catalog lists the consumer-replaceable parts, accessories, and supplies needed to keep an Agilent GC running at top performance: autosampler parts, injector and inlet parts and supplies, detector/MS parts and supplies, gas system components, tools, vials, syringes, and much more. Many items are designed to save time or improve results, and are exclusive to Restek. Many other items are manufactured specifically to equal or exceed the performance of the instrument manufacturer’s parts.
Our extensive library of free publications reflects many years of experience in developing and improving chromatographic analyses. Review the titles in this 4-page listing, then request the publications you’d like, or visit our website for downloadable files. Publication types include: Application Note — analysis-specific technical information (2-8 pages); Technical Guide — detailed discussion of a chromatographic technique or category of analyses (8+ pages); Fast Facts; Product Flyer — describes uses and benefits of a specific Restek GC or HPLC column, accessory, or analytical reference mix (2-8 pages); Other Literature includes our general catalog, minicatalogs, wall charts, and more.
