Abstract: Despite 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.
GC-MS/MS is the technique of choice for analyzing pesticide residues in many fruits, vegetables, botanicals, and herbals like tea, ginseng, ginger, Echinacea, and dietary supplements. And Restek’s new GC-MS/MS pesticide reference standards kit contains over two hundred compounds pulled from the food safety lists of the FDA, USDA, and other global agencies.
This stock, comprehensive set joins the 204-compound LC-MS/MS kit in Restek’s lineup of world-class certified reference materials (CRMs) for multiresidue pesticide analysis. Both kits are formulated and grouped for maximum long-term stability. Every ampul is quantitatively tested to confirm composition, and detailed support documentation is provided. Restek also supplies an optimized multiresidue pesticide method free of charge; the downloadable XLS file includes conditions and transition tables.
No more long nights or weekends in the lab. No more custom standards. Restek’s food safety experts can help you make quick work of getting the accurate results you need. Combine this ready-made multiresidue pesticide standards kit with Restek’s internal standards, Rxi®-5ms GC columns, Q-sep® QuEChERS sample preparation, inlet liners, and more.
What can Restek® Pure Chromatography and our 30 years of experience in the industry mean for you and your work? Scott Adams, our GC Accessories Product Marketing Manager, explains in this LabTube video from Pittcon 2015.
Restek is pleased to announce the release of a new EU 15+1 PAH reference standard for the analysis of PAHs in food and environmental samples. Formulated to contain the 16 major European Food Safety Authority (EFSA) PAH compounds, this new high concentration (100 μg/mL) blend can be diluted as needed to make economical fortification and calibration mixes. Our formulations chemists prepared this standard in toluene, as its lower volatility helps ensure longer shelf life, more accurate results, and suitability with both GC and LC methods. In addition, its broad solvent miscibility makes it compatible with acetonitrile, which is the QuEChERS solvent. In addition, being manufactured and QC-tested in Restek’s ISO-accredited labs means this standard will also help satisfy strict ISO requirements for the use of CRMs. This new standard is the latest addition to Restek’s expanding suite of products for PAH analysis. Restek also offers specialty GC and LC columns (Rxi®-PAH, Pinnacle® DB PAH, and Pinnacle® II PAH), certified reference standards, Q-sep® QuEChERS salts, Resprep® SPE cartridges, and other products for high-quality chromatographic separations of critical polycyclic aromatic hydrocarbons.
When Pittcon says they are “the world’s largest annual conference and exposition for laboratory science,” they mean it. It’s simply impossible to see and do everything! That’s why we have posted our presentations on our PIttcon page. Review them at your leisure, and feel free to get in touch with the authors directly to discuss them further.
Abstract: For several reasons, there is interest in replacing helium with a different carrier gas in gas chromatography. Hydrogen is the obvious choice but there is a concern on safety and reactivity. It is also possible to use nitrogen but this is often not considered because it has a low optimal flow and velocity. Here we will show that it is possible to replace helium for nitrogen as the carrier gas while separation, peak elution order, analysis time, response, and even oven temperature conditions can be kept the same.