Cannabis Testing Opens Up a Whole New Market

Author(s): Michelle Taylor, Editor-in-Chief
Chromatography Techniques / Laboratory Equipment

Published By: Chromatography Techniques / Laboratory Equipment

Year of Publication: 2015


Abstract: Given recent law and attitude changes in the United States, the cannabis industry is on the rise — which means the cannabis testing industry is likewise growing. From analyzing potency and pesticides to testing for terpenes and residual solvents, chromatography is aptly suited to the analytical needs of the cannabis testing industry. Chromatography Techniques Editor-in-Chief Michelle Taylor recently spoke with Amanda Rigdon, GC Columns Product Manager at Restek Corp., for her input on the past, present and future of the cannabis testing market.

Jaap de Zeeuw to Speak at Balaton Symposium

Jaap de Zeeuw

Jaap de Zeeuw

Restek is pleased to announce the participation of Jaap de Zeeuw in the 10th Balaton Symposium on High-Performance Separation Methods, which will be held September 2–4 in Siófok, Hungary. The Balaton Symposium is organized by the Hungarian Society for Separation Sciences every odd year, and it has grown to become one of the most important European separation science events. It is a highly technical and focused meeting that draws many important international speakers. The lecture abstract is presented below and more information on the event is available at:  For the full scientific program, visit

Presentation Abstract

A Simple Way to Use Nitrogen Instead of Helium as the Carrier Gas, while Maintaining Exactly the Same Separation Efficiency, Retention Times, and Peak Elution Order, without Changing the Oven Temperature Conditions

For several reasons, there is interest in replacing helium with a different carrier gas in gas chromatography. Hydrogen is the obvious choice, but there are some concerns with safety and reactivity. It is also possible to use nitrogen, but this is often not considered because it has a low optimal velocity and flow rate. However, by using method translation and chromatogram modeling, it is clear that the loss of efficiency observed when using nitrogen can be perfectly compensated for by using a smaller ID capillary of a shorter length. By replacing a 30 m x 0.25 mm column with a 20 m x 0.15 mm column, identical separations can be obtained in the same analysis time when using nitrogen instead of helium–with the exact same oven programming conditions. Even the inlet pressures are very close. The only price that has to be paid is a loss in loadability, which means that this concept will not work for every application, but it will be very useful for many. Besides the guaranteed availability, using nitrogen offers a big advantage in the cost and consumption volume of carrier gas, meaning cost per analysis will also benefit significantly.

Restek Releases the First Standard to Contain all Major PAH Interferences

PAH_interf_stds_PRThe new PAH interferences standard from Restek is the first and only certified reference material formulated to contain all major PAH interferences for priority PAHs. Analysts can use this mixture to quickly confirm the presence of common interferences by retention time comparisons. Since the PAH components are present in different concentrations, isomers can easily be distinguished by the difference in their response factors. Several key PAHs of health concern–such as chrysene and benzo[b]fluoranthene–coelute with other PAHs on most GC columns, which biases results. To ensure accurate reporting, this standard can be paired with an Rxi®-PAH column and Restek’s EU 15+1 PAH standard to optimize method conditions and ensure separation of interferences and target PAHs. As this new PAH interferences standard meets strict ISO quality requirements, it is also suitable for quantitative work as a calibration or fortification standard.


PAH Interferences Standard 250–1,000 µg/mL, Toluene, 1 mL/ampul

Cat.# 32472

Compound CAS# Concentration (µg/mL)
Benzo[k]fluoranthene 207-08-9 1,000
Benzo[j]fluoranthene 205-82-3 750
Triphenylene 217-59-4 750
Benzo[e]pyrene 192-97-2 500
Perylene 198-55-0 250


Our NACRW 2015 Page is Now Live

Go to our NACRW page for a sneak peek at what we’ll be up to during this year’s show. You can also read abstracts for all of our presentations, easily contact the presenters, and access the NACRW website for additional event details.

We’re looking forward to sharing our latest innovations for food and environmental analysis—and answering any questions you may have about how Restek® products and services can help you. See you there!

Restek at NACRW 2015

Rapid and Accurate LC-MS/MS Analysis of Nicotine and Related Compounds in Urine Using Raptor™ Biphenyl LC Columns and MS-Friendly Mobile Phases

Author(s): Shun-Hsin Liang
Restek Corporation

Published By: Restek Corporation

Year of Publication: 2015


Abstract: A rapid, accurate, and reproducible method was developed for high-throughput testing of nicotine, cotinine, trans-3’-hydroxycotinine, nornicotine, norcotinine, and anabasine in urine. Data show that a fast and highly efficient analysis of these basic compounds can be achieved with the Raptor™ Biphenyl column using standard, low pH, reversed-phase LC-MS mobile phases which are compatible with a variety of LC-MS instrumentation.

Our NEMC 2015 Page is Now Live

Before you go to NEMC 2015, visit our NEMC page to learn what we’ll be doing, to easily contact us with any questions you may have, and to access the NEMC website for additional event details.

As a sponsor of this year’s event, we’re especially looking forward to sharing our knowledge of environmental monitoring—and answering any questions you may have about how Restek® products and services can help you. See you there!

Restek at NEMC 2015