Keep Your Instrument Up and Running with CarboPrep Plus SPE Cartridges

Keep your organochlorine pesticide GCs up and running by protecting them against matrix components with superior sample cleanup. Resprep CarboPrep Plus SPE cartridges surpass traditional Florisil products in cleanup power for sample matrix compounds that cause active sites in GC inlets and columns, degrading pesticides and interrupting work due to failed calibration checks. For CarboPrep Plus cartridges, Restek uses a proprietary treatment to create an exceptionally clean carbon that exhibits consistent selectivity. The end result is a reliable sample preparation product that does not contribute interfering background signal and does not need to be evaluated lot to lot to see if elution volumes need to be adjusted. In addition, CarboPrep Plus cartridges are designed to use the same equipment, solvents, and solvent volumes as a traditional Florisil cleanup procedure, minimizing the impact of switching on sample prep labs while maximizing the performance benefit to analytical labs.
www.restek.com/CarboPrepPlus

Resprep VM-96 Vacuum Manifold now Available

vm96_primageRestek is pleased to announce the launch of the new Resprep VM-96 vacuum manifold. Designed for performance, versatility, ergonomics, and accuracy, this new product is suitable for everyday solid phase extraction (SPE), supported liquid extraction (SLE), protein precipitation (PPT), and filtration applications. The unit is compatible with 96-well plates from any manufacturer and has many features that make it superior to other models. The Resprep VM-96 has a heavy-duty, stainless steel and aluminum body so it stays in place better than lighter models and is precision manufactured so parts assemble quickly and easily. The built-in viewing window allows for easy observation of plate height and drip rate, and the durable O-ring and gaskets provide leak-free seals time after time. It also includes a precision height adaptor and five shims so users can customize plate height to their exact requirements.
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Protein and Particulate Removal That’s Fast, Painless, and Effective

Resprep PPT3 CRMRestek’s line of Resprep® sample preparation products has expanded to include 96-well protein precipitation (PPT) plates. New Resprep® PPT3 96-well plates offer highly efficient protein removal with built-in, drip-free membrane and 3-way versatility for filtration, so you can prepare serum, plasma, and other biological samples using the name you have long trusted for quality, cleanliness, and performance.

Resprep® PPT3 96-well plates offer consistently greater than 99% protein removal and drip-free, in-well protein precipitation for a minimum of 24 hours—with no fear of backflushing or contamination. A dual-layer membrane with different porosities in each layer prohibits clogging and speeds up filtration, and using our recommended solvent-first method streamlines sample preparation even further.

Resprep® PPT3 96-well plates are also incredibly versatile. The 2.0 mL deep wells are suitable for mixing by vortex or pipette, and these 96-well plates can be used to increase throughput in general filtration applications. Best of all, PPT3 96-well plates are compatible with all common filtration devices: vacuum manifold, positive pressure manifold, and centrifugation.

Order your Resprep® PPT3 96-well plates today at www.restek.com/PPT3

QuEChERS: The Concept

Author(s): Julie Kowalski, Amanda Rigdon, and Jack Cochran
Restek Corporation

Published By: Separation Science

Issue: vol. 5, issue 8

Year of Publication: 2013

Link: For the full print issue, visit http://www.sepscience.com/docs/Bespoke/Editions/SepSci/Sepsci0813eu.pdf?utm_source=iContact&utm_medium=email&utm_campaign=eLearning%20Newsletter%20-%20Europe%20Sep%20Sci&utm_content=

Abstract: The original QuEChERS sample preparation methods were designed for pesticide residue analysis of high water-content foods, specifically fruits and vegetables. QuEChERS methods provide “just enough” sample preparation because highly selective and sensitive modern instrumentation does not require extremely clean samples. In the first two installments of this series (#1 and #2), official methods were reviewed, as well as considerations for method development. Adjustments to the original methods for some difficult commodities and pesticides were reviewed as well. This article will focus on QuEChERS metamorphosis into a concept. “QuEChERS” will be used as a broad term in this article to describe not only modified QuEChERS methods but also methods based on QuEChERS principles. The success of QuEChERS relates back to the attributes set forth by the originators; Quick, Easy, Cheap, Effective, Rugged and Safe. In addition to these benefits, great flexibility and quick method development have encouraged the expansion of QuEChERS from specific methods to generic techniques, and now to a sample preparation concept.

QuEChERS: Beyond the Basics

Author(s): Julie Kowalski and Jack Cochran
Restek Corporation 

Published By: Separation Science

Issue: vol. 5, issue 4

Year of Publication: 2013

Link: http://www2.sepscience.com/Techniques/Sample-Prep/Articles/1863-/QuEChERS-Beyond-the-Basics

For the full print issue, visit http://www.sepscience.com/docs/Bespoke/Editions/SepSci/Sepsci0413eu.pdf?utm_source=iContact&utm_medium=email&utm_campaign=eLearning%20Newsletter%20-%20Europe%20Sep%20Sci&utm_content=

Abstract: QuEChERS is a sample preparation approach that was designed to be easy, cheap but effective and rugged at the same time. It is most often used for pesticide residue analysis but its beneficial features have assisted it in branching to other fields such as environment, bioanalytical and clinical. QuEChERS was originally designed for fruits and vegetables and proven to work especially well for high water content fruits and vegetables (>80 %) with slightly acid pH (5–6). However, there are commodities that don’t fit into this food type. Adjustments to the typical QuEChERS procedures extend its usage outside of these typical or easy commodities. Common examples include very acidic food like citrus fruits and fatty foods like avocado, milk and oils.

QuEChERS: A Primer

Author(s): Julie Kowalski and Jack Cochran
Restek Corporation

Published By: Separation Science

Issue: vol. 4, issue 12

Year of Publication: 2012

Link: http://www.sepscience.com/Techniques/Sample-Prep/Articles/865-/QuEChERS-A-Primer

For the full print issue, visit http://www.sepscience.com/docs/Bespoke/Editions/SepSci/Sepsci1012eu.pdf?utm_source=iContact&utm_medium=email&utm_campaign=eLearning%20Newsletter%20-%20Europe%20Sep%20Sci&utm_content=

Abstract: Quick, Easy, Cheap, Effective, Rugged and Safe, the QuEChERS (pronounced “catchers”) method is based on work done and published in 2003 by Anastassiades et al. QuEChERS was developed as an extraction method for pesticides in fruits and vegetables, coupled with a cleanup method that removes sugars, lipids, organic acids, sterols, proteins, pigments, and excess water. QuEChERS involves two simple steps: first, a homogenized sample is extracted and partitioned using an acetonitrile and salt solution, then, the supernatant is cleaned using a dispersive solid-phase extraction (dSPE) technique. This QuEChERS approach offers a user-friendly alternative to traditional liquid-liquid and solid-phase extractions.