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Technical Library

Technical Library

Featured Items from our Technical Library

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Semivolatile Organic Reference Materials: US EPA Method 8270D/8270C and Appendix IX Target Compounds

Restek offers all the required surrogate, internal standard, calibration check, matrix spike, and tuning mixtures required by EPA Method 8270. Our semivolatile organic reference materials are ready to use and prepared in as few solutions as possible for maximum shelf life. Fewer ampuls to open means fewer errors in preparation.
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Analyze Carbamate Pesticides in a Fraction of the Time and Boost Productivity

Carbamate pesticides can be analyzed much faster on an Ultra Carbamate LC column than on a C18 column. Whether using UV, fluorescence, or LC-MS detection, labs can achieve accurate carbamate determinations in just 5–10 minutes using an Ultra Carbamate column and certified reference materials from Restek.
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Analysis of Biodiesel Fatty Acid Methyl Esters (FAME) in Aviation Jet Fuels Using Method IP 585

Accurate analysis of biodiesel FAME in jet fuel is critical for ensuring that contamination levels do not exceed allowable limits. Method IP 585 is commonly used for this analysis and here we perform the method using a Stabilwax column and GC-MS in SIM mode. Method calibration curve criteria were met and good recoveries of the total FAME content in jet fuel were obtained.
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DiatoSorb-W Diatomaceous Earth: Great Chromatography Millions of Years in the Making

Virtually unlimited in supply—but only available from Restek—new DiatoSorb-W diatomaceous earth offers a reliable alternative for packed column users. After years of dealing with supply shortages and inconsistent product quality, analysts who depend on diatomaceous earth columns now have a reliable new source. Restek now uses DiatoSorb-W as the exclusive replacement to the diatomaceous earth that was previously used in our standard and Silcoport W GC packed columns lines. All DiatoSorb-W material undergoes rigorous quality testing to ensure high purity and dependable performance. DiatoSorb-W material is available in acid-washed (WAW), non-acid washed (WNAW), and high-performance (WHP) varieties.
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Influencing Selectivity in LC-MS Peptides Analysis on the Raptor ARC-18 Column

Methods for LC-MS peptide analysis often use acidified mobile phases, which can alter retention and selectivity. Here, we demonstrate the effects of modifying acid type, acid concentration, temperature, and gradient slope using several test probes. A Raptor ARC-18 column was employed for this work because it is sterically protected making it extremely stable and resistant to acid damage at low pHs, which is an important characteristic when developing LC-MS methods for peptide analysis.
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Force LC Columns Brochure

Force LC columns are long-lasting and reproducible, even under the stress of UHPLC. Premium quality is backed by the strength of our 100% Pure Satisfaction guarantee. And perhaps most important, Force LC columns are fully scalable between 3 or 5 µm HPLC and 1.8 µm UHPLC, so you can easily transfer and optimize methods without extensive calculations.
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Analysis of Synthetic Cannabinoids and Metabolites: Adding New Compounds to an Existing LC-MS/MS Method

The analysis of synthetic cannabinoids and their metabolites can be a difficult and challenging task. Keeping up with the ever-growing list of synthetic cannabinoids that illicit drug makers produce further complicates the analysis. As shown here, the retention and selectivity of the Raptor Biphenyl column allows new drugs to be added to an existing method, providing labs with an important vehicle for improving efficiency and productivity.
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Ensure Successful Polycyclic Aromatic Hydrocarbon (PAH) Analysis—Choose Specialized Rxi-PAH Columns

Whether you are analyzing comprehensive lists or focusing on the EFSA PAH4, the Rxi-PAH column ensures your success by combining efficiency, selectivity, and robustness to produce a column that outperforms all competitors’ columns. Chose the configuration that best suits your application and be confident that you are reporting accurate results without bias from interferences.​
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Rapid Analysis of C3 Epimers of 25-Hydroxyvitamin D in Serum by LC-MS/MS

The C3 epimers of 25-hydroxyvitamin D have lower bioactivity than the primary metabolites and, unless they are chromatographically separated, can cause clinical vitamin D levels to be overestimated. Raptor FluoroPhenyl columns provide baseline resolution of all key compounds, and the method established here allows accurate quantification in a fast, 5-minute analysis time (7-minute total cycle time). This method is recommended for labs interested in reporting C3 epimer concentrations separately in order to obtain more accurate results for the clinical diagnosis of vitamin D status.
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Raptor FluoroPhenyl LC Columns Brochure

Restek has now extended the speed and reliability of Raptor column technology into the HILIC realm with the addition of Raptor FluoroPhenyl columns. Restek's Raptor FluoroPhenyl phase offers chromatographers the ability to run in reversed-phase or HILIC mode for a variety of compounds. The Restek Raptor FluoroPhenyl column is also amenable to LC-MS because it is extremely reliable and efficient with acidic mobile phases.
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