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テクニカルライブラリ

テクニカルライブラリ

Featured Items from our Technical Library

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Faster Semivolatiles Analysis with a Scaled-Down Method and GC Accelerator Kit

Scaling down GC-MS columns and conditions can result in faster semivolatiles analysis times and increased sample throughput, but only when done correctly. In this technical article we demonstrate how to scale an existing method on a traditional format (30 m, 0.25 mm ID, 0.25 µm df) arylene-type column down to a 20 m long, 0.15 mm ID, 0.15 µm df column. By using a properly scaled column and method along with a GC Accelerator oven insert kit, the same separation was achieved with a saving of six minutes per injection.
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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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Featured Application: Volatile Amines on Rtx-Volatile Amine

Restek’s Rtx-Volatile Amine column is specifically designed for GC analysis of volatile amines in challenging matrices. The stable bonded phase is highly retentive and selective for volatile amines to ensure good chromatographic separations and peak shapes. In addition, the column is very robust and able to withstand repeated exposure to harsh sample matrices, such as water.
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DiatoSorb-W Diatomaceous Earth: Great Chromatography Millions of Years in the Making

Virtually unlimited in supply—but only available from Restek—new DiatoSorb-W diatomaceous earth offers a reliable alternative for packed column users. After years of dealing with supply shortages and inconsistent product quality, analysts who depend on diatomaceous earth columns now have a reliable new source. Restek now uses DiatoSorb-W as the exclusive replacement to the diatomaceous earth that was previously used in our standard and Silcoport W GC packed columns lines. All DiatoSorb-W material undergoes rigorous quality testing to ensure high purity and dependable performance. DiatoSorb-W material is available in acid-washed (WAW), non-acid washed (WNAW), and high-performance (WHP) varieties.
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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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Force LC Columns Brochure

Force LC columns are long-lasting and reproducible, even under the stress of UHPLC. Premium quality is backed by the strength of our 100% Pure Satisfaction guarantee. And perhaps most important, Force LC columns are fully scalable between 3 or 5 µm HPLC and 1.8 µm UHPLC, so you can easily transfer and optimize methods without extensive calculations.
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High-Throughput Analysis of Cannabinoids by LC-UV

This simple, isocratic LC-UV analysis of cannabinoids provides complete resolution of 16 cannabinoids, allowing accurate quantitative potency and profile data to be reported. All compounds are separated to baseline in a fast, 9-minute analysis, making this method suitable for high-throughput cannabis testing labs.
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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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Simplified Methylmalonic Acid Analysis without Derivatization in Human Plasma by LC-MS/MS

Methylmalonic acid analysis is an important clinical test for diagnosing vitamin B12 deficiency as well as methylmalonic acidemia. Methods typically require extensive sample preparation, which involves significant time and expense. The LC-MS/MS method developed here offers a much simpler alternative, providing complete chromatographic resolution of isobaric analytes from the direct injection of a protein crash sample supernatant onto a Force C18 column.
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LC-MS/MS Analysis of Urinary Free Cortisol and Cortisone without Matrix Interferences

In general, LC-MS/MS analysis of urinary free cortisol and cortisone can provide better specificity than immunoassay-based methods. However, it is critical that the analytical column has the proper selectivity for chromatographically separating cortisol from isobaric matrix components. In the method presented here, complete separation of the target analytes and matrix interferences was obtained in a 3-minute analysis on a Raptor Biphenyl column.
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