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Technical Library

Technical Library

Featured Items from our Technical Library

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Improve EPH Testing Accuracy and Efficiency with Resprep EPH Fractionation SPE Cartridges

New and improved Resprep EPH fractionation SPE cartridges from Restek completely separate aliphatic and aromatic compounds, and they are guaranteed to produce background levels that are below the strict reporting limits of MA and NJ EPH methods. Superior lot-to-lot reproducibility and storage stability mean every lot will perform the same as the lot before it.
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Eliminate the Impact of Instrument-Related PFAS Interferences by Using a Delay Column

Using a PFAS delay column is an effective way to separate target PFAS in samples from interferences caused by PFAS contamination in the LC system. This article explains how the PFAS delay column can improve trace-level PFAS analysis by removing the impact of system-related interferences.
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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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Robust Analysis of Fatty Acids in Milk: An Independent Lifetime Evaluation of Rt-2560 GC Columns

The analysis of fatty acids in milk fat is an important test and this challenging matrix was used by Eurofins Analytik GmbH to evaluate the stability of Rt-2560 columns. Consistent retention times and separations were achieved even after 225 injections, demonstrating the column’s robust performance.
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Can Nonmatching Mycotoxin SIDA Internal Standards Be Used for Stable Isotope Dilution Assay Calibration?

Stable isotope dilution assay (SIDA) is a calibration technique that can be used to offset matrix effects. However, care must be given to choosing appropriate internal standards. This article demonstrates the importance of using a labeled internal standard that matches the target analyte for mycotoxin SIDA analysis.
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LC-MS/MS Analysis of 58 Antipsychotics and Antidepressants in Human Urine

Simultaneous measurement of 58 antipsychotic and antidepressant drugs in human urine can be achieved with a simple sample preparation procedure and a fast 5.5-minute LC-MS/MS analysis on a Raptor Biphenyl column. This method provides accurate, high-throughput determinations and is suitable for both clinical and forensic monitoring.
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Evaluation of a Simple Method for Methylmalonic Acid Analysis in Human Plasma by LC-MS/MS

A new LC-MS/MS method for methylmalonic acid (MMA) analysis was developed that provides complete chromatographic resolution from isobaric succinic acid in plasma samples. Excellent chromatographic results were obtained from the direct injection of a protein crash sample supernatant onto a Force C18 column, providing a much simpler sample preparation compared to typical methods.
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