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Technical Library

Technical Library

Featured Items from our Technical Library

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Rtx-Wax: A Rugged and Reliable Choice for the Analysis of Glycols in Water

Three types of polyethylene glycol (PEG) columns from different vendors were evaluated to determine which performed best for the analysis of glycols in water. The columns were first challenged with exposure to 600 aqueous injections and then linearity, lifetime, and bleed were assessed. Rtx-Wax columns performed well throughout the test and were the only columns that passed all tests.
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Integrating the Analysis of Ultrashort-Chain PFAS

A simple dilute-and-shoot method was developed and validated for the LC-MS/MS analysis of ultrashort-chain PFAS simultaneously with alternative and legacy PFAS in various water samples. This method is recommended for analytical labs wanting to use a single method to analyze compounds from all three PFAS categories in potable and non-potable waters.
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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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View more Petroleum & Petrochemical articles...


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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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Improve Acrylamide Analysis with a Long-Lasting LC Column and a Cost-Effective Internal Standard

The porous graphitized carbon (PGC) columns typically used for acrylamide analysis by method EN 16618.2015 provide adequate retention of acrylamide and sufficient separation from matrix components, but they are subject to short column lifetimes and the need for extensive sample preparation. Here, we demonstrate an approach using an Allure Acrylamide LC column and deuterated internal standard that provides faster total analysis times and meets system suitability requirements longer, allowing labs to significantly increase sample throughput.
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Accurate, Reliable GC Analysis of Triglycerides in Edible Oils

Restek’s new Rxi-65TG column offers best-in-class thermal stability up to 370 ˚C, making it the top choice for the analysis of triglycerides in edible oils. With the lowest bleed on the market for 65-type columns, Rxi-65TG columns consistently produce quality separations with less interference from bleed and fewer column changes.
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Successful Strategies for the Analysis of EtG and EtS in Urine

LC-MS/MS analysis of EtG and EtS is challenging due primarily to poor retention and resolution of EtG and EtS from matrix components. This article presents a foundation method that is useful for many samples and also demonstrates effective strategies for improving sensitivity and mitigating matrix effects.
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Analysis of Amphetamines by LC-MS/MS for High-Throughput Urine Drug Testing Labs

Accurate analysis of amphetamines by LC-MS/MS can be achieved using chiral columns, but the analysis presented here provides a simpler, more cost-effective approach for high-throughput labs. Excellent separation of all enantiomers in urine was obtained in a fast, 7-min quantitative analysis on a Raptor C18 column with no interference from matrix components.
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