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Technical Library

Technical Library

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Reliable Low-Level Analysis of Glycols in Water Using Split Injection

Obtaining consistent results for low-level analysis of glycols in water samples is difficult when using splitless injection due primarily to issues with backflash, poor peak shape, and shifting retention times. The split injection method shown here avoids these problems and reliably produces good chromatographic results. Lifetime testing demonstrated that Rtx-Wax columns produce stable results, even after column integrity was challenged with 600 water injections.
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Increase Sample Throughput with New 15-Minute, Low-Level PAH GC-MS Analysis

Polycyclic aromatic hydrocarbons (PAHs) are analyzed at low levels around the world in order to protect human and environmental health. The PAH GC-MS analysis shown here uses SIM mode and column and method parameters scaled down from a commonly used semivolatiles method. Good chromatographic results were achieved down to 0.05 ng on-column in a fast, 15-minute analysis time.
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Analysis of FAMEs in Biodiesel Fuel: Pro EZGC Modeling Software Ensures Proper Column Selection

Polar columns were evaluated for the analysis of fatty acids methyl esters (FAMEs) in finished B100 biodiesel according to method EN 14103 (2011). Using Restek’s Pro EZGC chromatogram modeler, a high cyano phase Rt-2330 column and a polyethylene glycol phase FAMEWAX column were compared. The modeling software predicted an unacceptable coelution between the internal standard (C19:0 FAME) and FAME C18:2 when using the Rt-2330 column. However, the modeler also predicted that the FAMEWAX column would separate all the compounds of interest, which was demonstrated empirically. In addition, the results on the FAMEWAX column showed excellent repeatability for both total FAMEs and the linolenic acid methyl ester component.
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Faster Detailed Hydrocarbon Analysis (DHA) Using Hydrogen

Robust Rtx-DHA columns are highly stable and can be run with hydrogen carrier gas under accelerated conditions. The hydrogen-based method for detailed hydrocarbon analysis shown here is twice as fast as traditional approaches, which allows labs to process samples faster and make more profitable decisions during product blending.
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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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High-Throughput Analysis of Mycotoxins in Cannabis CBD Oil Pairs Simplified Cleanup with LC-MS/MS Sensitivity

Complex, time-consuming immunoaffinity column sample prep protocols for mycotoxins can be replaced by this simple pass-through SPE sample cleanup. Paired with LC-MS/MS analysis using a Raptor Biphenyl column, excellent chromatographic results were obtained for aflatoxins and ochratoxins at 2 ng/g, providing a high-throughput solution for analyzing mycotoxins in cannabis.
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Comprehensive LC-MS/MS Analysis of 15 Bisphenols in 8 Minutes

The analysis of bisphenolic compounds that are used as alternatives to bisphenol A (BPA) is essential for monitoring exposure to and evaluating the safety of these emerging industrial chemicals. The LC-MS/MS method presented here provides excellent chromatographic peak shape and separation for an extensive list of BPA analogues in a fast, 8-minute analysis.
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Highly Selective LC-MS/MS Analysis of Mycotoxins from Multiple Classes

Mycotoxin contamination of crops is not only a public health concern, but it also has a huge impact on the global economy. This highly selective LC-MS/MS analysis of 20 mycotoxins in just 9 minutes allows scientists to accurately identify toxins, to monitor food products for contamination, and to support control strategies that prevent economic loss.
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Fast, Simple LC-MS/MS Analysis of Creatine and Creatinine

A rapid, robust method was established for the analysis of creatine and creatinine in human plasma and urine. An efficient separation was achieved in less than 1.5 min using a Raptor HILIC-Si column and a simple isocratic mobile phase.
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A Novel Solution for Vitamin K1 and K2 Analysis in Human Plasma by LC-MS/MS

Vitamin K1 and K2 analysis is typically complex and time-consuming because these lipophilic vitamins occur at low levels and are subject to matrix interference, particularly from phospholipids. The new method established here provides fast, accurate, and precise vitamin K levels in plasma using a simple phospholipid removal procedure and a sensitive 4-minute LC-MS/MS analysis on a Raptor Biphenyl column, making it suitable for high-throughput testing.
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