Cannabidivarin (CBDV) Added to Restek’s Selection of Cannabis Reference Standards

Cannabis strains with high levels of cannabidiol (CBD) typically have higher levels of cannabidivarin (CBDV) as well, but accurate quantitation of both compounds for potency and strain ID is a must, especially as interest in using CBDV as an anticonvulsant and anti-nausea treatment continues to rise. Restek now offers a stand-alone CBDV reference standard—in addition to CBD and a host of other compounds—to help labs with the comprehensive analysis of cannabis products.

Restek’s CBDV standard is ideal for creating multipoint (5-point minimum suggested) calibration curves for LC-MS/MS. With verified composition and stability, this prepared stock product eliminates the need for in-house standards preparation for greater convenience and lower labor requirements. As a U.S. DEA-exempted formulation, no additional customer permits or licensing are required to purchase within the U.S., and because it’s manufactured and QC tested in Restek’s ISO-accredited labs, this new CBDV standard qualifies as a certified reference material (CRM) that satisfies your ISO requirements.

For CBDV, CBD, and other cannabis reference standards, along with the expertise and consumables your lab needs, turn to

New Pesticide CRMs Released Specifically for Cannabis Labs in California and Similar States

Restek’s support for cannabis-testing labs continues to grow. This latest offering will help you meet the specific cannabis analysis needs of California set forth by the Bureau of Cannabis Control for regulated category I and II residual pesticide reporting—and of other states with similar regulations/programs. Ideal for creating multipoint (5-point minimum suggested) calibration curves for GC- and LC-MS/MS, these six mixes of prepared stock standards also eliminate the need for in-house standards preparation. And, as with all certified reference materials (CRMs) manufactured and QC tested in Restek’s ISO-accredited labs, they will satisfy your ISO requirements.

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New CBGA Reference Standard for Your Cannabis Potency Testing Program

Restek’s ever-growing selection of cannabis reference standards has expanded again with a new cannabigerolic acid (CBGA) CRM. This certified reference material (CRM) is U.S. DEA exempt, so there’s no need to purchase costly neat materials, make your own standards, or deal with DEA forms and registrations. Verified in composition and stability, this CBGA standard is ideal for combining with other Restek cannabinoid CRMs for quantitative potency analysis using the Raptor ARC-18 LC column. And like all Restek certified reference materials (CRMs), it is manufactured and QC tested in ISO-accredited labs to satisfy your ISO requirements.

Your CBGA standard is in stock now at You can also find it, along with the rest of Restek’s cannabis analysis solutions, at

Restek Employee-Owner Joins Editorial Board of Influential Cannabis Science Publication

Ashlee Gerardi joins Cannabis Science and Technology in an effort to advance the science of safety and potency testing in this growing industry

A new industry has bloomed, offering scientists a rare opportunity to build a field from the ground up, and Restek has already been helping.

In addition to Restek’s cannabis-specific products, applications, and support for cannabis testing labs, Ashlee Gerardi, Associate Business Development Manager at Restek, has joined the editorial advisory board of Cannabis Science and Technology. In her role, she will review articles submitted to the publication and provide additional insight and information on the cannabis testing industry by attending conferences and participating in trade association focus groups.

“I’m looking forward to advancing cannabis science and helping to ensure quality education continues to be found in the magazine,” she said. “Teaching this audience the fundamentals of chemistry and chromatography is vital to testing in this growing industry.”

Gerardi joined Restek in 2011, moving to Restek’s California office in 2013 as an R&D chemist. However, the demand for an additional business development manager was soon needed for the growing cannabis analysis industry, and Ashlee was eager to use her technical background and business knowledge to help Restek’s cannabis customers as an associate business development manager for the cannabis testing industry.

“Because the landscape is rapidly changing, one of the fastest-growing needs of the cannabis market is legitimacy. Our team at Restek provides consumables as well as testing solutions for product quality, potency, and safety analyses in the market,” she said.

Gerardi said the cannabis industry has a lot to offer adventurous scientists, as “there is still much of the cannabis plant that needs to be understood along with analytical challenges/pain points that remain to be solved,” adding that “Restek is supported by many knowledgeable scientists whom I interact with daily. Our team is constantly working to solve analytical pain points such as potency, terpenes, mycotoxins, residual solvents, and pesticide testing.”

By way of example, Ashlee noted that the recent November/December edition of Cannabis Science and Technology, Restek’s Justin Steimling, LC Solutions Applications Manager, wrote, “If product labels are to accurately reflect cannabinoid content, the complete sample composition must be considered in developing a robust and accurate analytical method.”

Gerardi said she keeps up with the wealth of cannabis knowledge through publications like Cannabis Science and Technology, but also through conferences and social media.

Gerardi still sees a lack of legitimacy in the cannabis market but says, “Restek is proud to have helped cannabis labs establish sound analytical practices from the beginning, and we will continue to be there for you every step of the way as the testing landscape changes.” In September 2019, she will attend the annual Cannabis Science Conference in Portland, OR, where she plans to give an oral presentation.

To read more from Ashlee about her experiences in the cannabis industry follow her on LinkedIn and follow Restek on Twitter, Facebook, and LinkedIn.

Analyze Residual Solvents in Cannabis with Confidence

This new certified reference material (CRM) from Restek contains 20 of the most commonly analyzed residual solvents in one convenient solution. Designed for cannabis labs testing residual solvents by headspace GC, this convenient high-concentration (3000 µg/mL) formulation makes it easy to prepare accurate working standards for various threshold limits. With verified composition and stability, this CRM is manufactured and QC-tested in Restek’s ISO-accredited labs to satisfy your ISO requirements. In stock now and available for immediate shipment.

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Leveraging Selectivity and Efficiency to Take the Strain Out of LC–UV Method Development for Cannabinoid Profiling

Author(s): Justin Steimling
Restek Corporation

Published By: Cannabis Science and Technology

Issue: Volume 1, Issue 4

Year of Publication: 2018


Abstract: More than 100 cannabinoids have been isolated from cannabis in addition to the five most commonly tested: ∆9-tetrahydrocannabinol (∆9-THC), ∆9-tetrahydrocannabinolic acid (THCA), cannabidiol (CBD), cannabidiolic acid (CBDA), and cannabinol (CBN). Although many methods have been published that show the separation of these major cannabinoids, most do not take into account the possibility of interference from minor cannabinoids. This interference is most problematic in concentrates where minor cannabinoids can be enriched to detectable levels. Additionally, some terpenes absorb ultraviolet (UV) light at the same wavelength as cannabinoids, which can result in an additional source of interference. In this study, the liquid chromatography (LC)–UV separation of 16 cannabinoids of interest was performed while the potential impact from minor cannabinoids and terpenes on reported potency values was monitored. The method was applied to commercially available CBD oils that have recently become suspect because of inaccurate label claims.