Pure Chromatography
www.restek.com
www.restek.com
Foods, Flavors & Fragrances Solutions
MOSH/MOAH Standard (9 components)
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LC Multiresidue Pesticide Kit
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GC Multiresidue Pesticide Kit
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Everything you need for QuEChERS!
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Rxi-5Sil MS Columns (fused silica)low-polarity phase; Crossbond 1,4-bis(dimethylsiloxy)phenylene dimethyl polysiloxane
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Flip Seal Dual Vespel Ring Inlet SealsRestek Innovation! Patented. Reversible Flip Seal Inlet Seal—Same Cost, Extended Lifetime
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Thermal Desorption (TD) ProductsThermal desorption (TD) tubes in a variety of styles, grab samplers, multiple tube sequential samplers, sampling pumps, and accessories.
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Ultra Aqueous C18 Columns (USP L1)Stationary Phase Category: modified C18 (L1) Ligand Type: proprietary polar modified and functionally bonded C18 Particle: 3 µm or 5 µm, spherical Pore Size: 100 Å Carbon Load: 15% End-Cap: no Surface Area: 300 m2/g pH Range: 2.5 to 8 Maximum Temperature: 80 °C |
Lampsfor Agilent HPLC Systems |
Lampsfor Waters Detectors |
 Featured Application: Multiresidue Pesticide Mix Extracted from Brown Rice Flour Using QuEChERS Extraction and Cleanup - 7.5-Min Screening Analysis of Multiresidue Pesticides in Brown Rice FlourMultiresidue pesticides analysis presents many challenges, from extensive lists of chemically diverse analytes to the negative effects of complex matrix components. The optimized chromatographic method described here allows the analysis of hundreds of compounds in as little as 7.5 minutes with a total cycle time under 10 minutes, ensuring fast, accurate sample screening and increased lab productivity. |
Featured Application: Multiresidue Pesticide Mix Extracted from Brown Rice Flour Using QuEChERS Extraction and Cleanup - 7.5-Min Screening Analysis of Multiresidue Pesticides in Brown Rice FlourMultiresidue pesticides analysis presents many challenges, from extensive lists of chemically diverse analytes to the negative effects of complex matrix components. The optimized chromatographic method described here allows the analysis of hundreds of compounds in as little as 7.5 minutes with a total cycle time under 10 minutes, ensuring fast, accurate sample screening and increased lab productivity. |
Residual Pesticides Analysis of Botanical Ingredients Using Gas Chromatography Triple Quadrupole Mass SpectrometryDietary supplements, which are consumed worldwide, are made from various botanical ingredients. To be safe from pesticides exposure, residual pesticides must be monitored by chromatographic instrumentation. Issues arise, however, due to the fact these botanical samples are dried and cause large interferences in the chromatography. This study shows that the modified QuEChERS method combined with GC-MS/MS achieves consistent pesticides monitoring in botanical ingredients. |
Featured Application: Pyrrolizidine Alkaloids on Raptor ARC-18 - Rapid, Simple 4.5-Minute Pyrrolizidine Alkaloids Analysis by LC-MS/MSPyrrolizidine alkaloid analysis is time consuming, with a typical run time of 15 minutes, and the acid digestion step can shorten analytical column lifetime. In contrast, this analysis using an acid-resistant Raptor ARC-18 column eluted the final compound in just 3.2 minutes with good peak shape and separation. |
Featured Application: Mycotoxins in Peanut Powder on Raptor Biphenyl - 5.5 Minute LC-MS/MS Analysis of Mycotoxins |
 Analysis of Synthetic Cannabinoids and Metabolites: Adding New Compounds to an Existing LC-MS/MS MethodThe 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 drugmakers 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. |
Highly Reproducible Detailed cis/trans FAMEs Analysis Ensured by New Optimized Rt-2560 Column Manufacturing and Application-Specific QC TestEven minor variations in manufacturing processes can potentially have detrimental effects on column-to-column reproducibility. As shown here, Rt-2560 GC columns produced using a newly updated and optimized manufacturing process exhibit high reproducibility and provide consistent performance for detailed cis/trans FAMEs analysis. |
Rt-2560 Columns Ensure Accurate, Reliable AOAC 996.06 and AOCS Ce 1j-07 FAMEs AnalysisRestek has optimized the manufacturing process and implemented a new, application-specific QC testing procedure for all new Rt-2560 columns (cat.# 13198). Here we demonstrate that, Rt-2560 columns produced using the optimized process exhibit excellent performance for both AOAC 996.06 and AOCS Ce 1j-07 FAMEs analysis and meet all method requirements. |
Analysis of Nicotine and Impurities in Electronic Cigarette Solutions and VaporDespite the growing popularity of electronic cigarettes, relatively little work has been done to characterize their vapor. In this study, we developed a quick, simple thermal desorption device for sampling vapor, as well as methods for analyzing vapor and solutions to determine nicotine content (GC-FID) and impurity profiles (GC-MS). This novel approach, which utilizes an Rtx-VMS column, provides detectable levels of volatile organic compounds (VOCs) and semivolatile organic compounds (SVOCs) from a single 40 mL puff. |
Analytical Method for Polycyclic Aromatic Hydrocarbons (PAHs) in Yerba Mate Tea Using Modified QuEChERS, Solid Phase Extraction and GC-TOFMS and GC-MS/MSThis application note describes the development of an analytical method for PAHs in tea that allows analysts to more quickly and accurately characterize target PAHs. Sample preparation is based on a modified QuEChERS extraction and solid phase extraction sample cleanup. Both GC-TOFMS and GC-MS/MS techniques were used and analyses were optimized for resolution of isobaric compounds, as well as for maintaining a reasonable analysis time. |
High-Quality Analysis of Pesticides in Cannabis Using QuEChERS, Cartridge SPE Cleanup, and GCxGC-TOFMSAs medical marijuana is more frequently prescribed, patient safety must be ensured. Pesticide residue testing is an important part of assuring safe product is dispensed, but analysis can be extremely challenging due to matrix complexity. The use of QuEChERS, cartridge SPE cleanup, and GCxGC-TOFMS as presented here, produces high-quality quantitative data for this difficult analysis. |
Evaluation of Dispersive and Cartridge Solid Phase Extraction (SPE) Cleanups for Multiresidue Pesticides in QuEChERS Extracts of Finished Tobacco Using GCxGC-TOFMSWe compared the efficacy of dSPE and cSPE cleanup methods for multiresidue pesticide analysis of QuEChERS extracts of finished tobacco products using GCxGC-TOFMS. Cleanup with dSPE tubes containing 7.5 mg of GCB and 25 mg of PSA produced better results than other methods, with average recoveries of 92% and 91% for 500 ppb and 50 ppb fortifications respectively. |
 Matrix Effects in Multi-Residue Pesticide Analysis When Using Liquid Chromatography-Tandem Mass SpectrometryMatrix effects present a significant challenge to multi-residue pesticide analysis of food samples using LC/MS/MS. In this editorial, Dr. Kai Zhang, of the FDA Center for Food Safety and Applied Nutrition, discusses approaches that minimize matrix effects. |
Comparing Pesticide Residues in Amish and Commercially Grown Strawberries and Spinach Using QuEChERS, Various dSPE Sorbents, and GC-TOFMSQuEChERS extraction, dSPE cleanup, and GC-TOFMS analysis were used to assess pesticide residue levels in strawberry and spinach from both commercial and Amish growers. Various dSPE sorbent products were compared to determine which were most effective. |
Dual Vespel Ring Inlet Seals - Washerless, Leak-Tight Seals for Agilent GCsRestek's Dual Vespel Ring inlet seal gives you a better seal with fewer parts. Data show that the soft Vespel material has a much lower leak rate than a metal seal. Also, since less torque is required for installation, user variability is reduced. |
 New Rxi-PAH GC Column; Resolve Important Isobaric Polycyclic Aromatic Hydrocarbons for Food Safety and Environmental MethodsSeparate isobaric polycyclic aromatic hydrocarbons, including priority EFSA PAH4 compounds benz[a]anthracene, chrysene, benzo[b]fluoranthene, and benzo[a]pyrene, easily and accurately on an Rxi-PAH column. Whether you need more resolution or faster analysis, these new GC columns offer the selectivity and efficiency you need for food safety and environmental PAH analysis. |
 NEW! Rx-1301Sil MS GC ColumnsThe new Rxi-1301Sil MS column is ideal for the analysis of multiple compound classes across a range of polarities and volatilities. With its cyano-based selectivity and high thermal stability, it is the best 1301-type column for robust MS analyses. |
 HPLC Analysis of Glucosinolates in Vegetable Extracts without Ion Pairing Using an Ultra Aqueous C18 ColumnGlucosinolates with hydrophilic functional groups are very difficult to retain by conventional reversed phase HPLC, and when the functional groups in a sample are diverse, polarity can differ widely, complicating the problem. Until now, reversed phase HPLC with an ion pairing reagent has been the inconvenient, but necessary, approach to these analyses. This 2-page note describes a column and conditions for analyses of glucosinolates, without ion pairing. |
 Thermal Desorption: A Practical Applications Guide: IV. Food, Flavour, Fragrance & Odour ProfilingThermal desorption is used extensively for measuring volatile and semivolatile components in foods, flavors, fragrances, and odors. This 28-page publication from Markes International Ltd. presents several key applications. |
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