Archive for 2019

A Quick Look at Vitamin E Acetate Screening on the Raptor ARC-18

  There’s been a lot of focused on vaping crisis and the potential culprit causing dozens of deaths in the United States.  The CDC believes Vitamin E Acetate might be the common linker in these cases.  Vitamin E derived oils are sometimes used as a thickening agent or to dilute THC and increase profits.1 Normally, […]

Analyzing orange: peel and pulp separately or as whole?

Up to this point, I’ve focused on the optimization of QuEChERS salts and dSPE cleanup with fairly homogenous matrices. So, what about oranges? Should I peel them and analyze only the pulp? After all, that is the edible part. The peel is used as well – pressed into essential oils or scraped into zest. Besides, […]

Glycols…. Tis The Season!

Tis the season to be thinking about glycols…. Why you ask?  Well its currently winter as I’m writing this and glycols, specifically propylene glycol (PG) and ethylene glycol (EG), along with other ingredients, are used in airports for deicing planes.  Propylene glycol based fluids are more common since they are less toxic than ethylene glycol […]

Custom Solutions for Your Cannabis Testing Needs

If you’re a cannabis testing lab or manufacturer, you’re probably familiar with the current reference standards available on the market.  However, these off the shelf solutions might not fit your workflow needs.  Wouldn’t it be nice to have an option to dial in your ideal references standards to meet your daily testing tasks? Well…Restek’s custom […]

GC Inlet Liner Selection, Part IIB: Split Liners Continued

My colleague, Alan Sensue, asked a couple of great questions in regards to my previous blog post on split liners.  To summarize, he was interested in what happens to responses for the various liners when you change split ratios.  For instance, if you go from a 20:1 split to a 40:1 split, do detected peak […]

Terpene Analysis Approaches – Part I

Welcome to the newest blog series that totally stinks! In this series we’re going to look at different approaches for analyzing terpenes in cannabis. To quickly brief those who may not be familiar with terpenes, this class of compounds is responsible for many of the flavors and aromas in cannabis. Not only are cannabis growers […]

Thrive with the New Rxi-65…TG!

Introducing our new and improved GC stationary phase: The Rxi-65TG! This column is essential for analyzing triglycerides in edible oils! You may be asking yourself, why the need for a new 65-type phase? Well, we certainly were not happy with the way our current Rtx-65TG was performing. After redeveloping the polymer and using Rxi technology, […]

How Can You Make Food Homogenization Less of a Grind?

Sample preparation of a food matrix is only as good as the initial homogenization of your sample.  This determines how representative and effective your extraction will be.  There are multiple ways to homogenize, grind or comminute your sample.  Some involve a simple grind in a food processor.  Other methods require expensive instrumentation to cryogenically freeze […]

Pro EZGC Terpene Libraries Update

Whether you’re doing testing for cannabis, hops, or other food and fragrance analysis, you probably have an interest in terpenes. Now, to help out with that analysis we’ve updated our Pro EZGC libraries with 60 terpenes and terpenoids for the Rxi-17 and Rtx-200 columns. Compound CAS# Compound CAS# alpha-Pinene 80-56-8 Menthone 89-80-5 Isovaleric acid 503-74-2 […]

GC Inlet Liner Selection, Part II: Split Liners

In the previous installment of this blog series, I discussed liner selection for splitless analyses (GC Inlet Liner Selection, Part I: Splitless Liner Selection).  Today I’d like to discuss liners for split analyses.  During a split injection, the split vent is open and the majority of the flow is vented.  The split ratio, set by […]