Posts Tagged ‘QuEChERS’

QuEChERS – Where to start?

Enjoy the tip!* I am often asked for QuEChERS product recommendations. Usually the request is something like, “I need to test pesticides in _____” and that blank can be just about anything…sometimes not even food. Unless it is something I have tested before, I usually take a quick look online to determine the approximate composition […]

Which GC instrument should I use for the analysis of pesticides in herbal tea? GC-MS/MS or GCxGC-TOFMS?

You may remember a while ago I posted a blog about the analysis of herbal tea using QuEChERS and GCxGC-TOFMS.   The LECO Pegasus GCxGC-TOFMS is a great instrument for analyzing complex samples because of the comprehensive chromatographic separation achieved (two columns with different selectivities).  The GCxGC-TOFMS also excels at non-target screening of compounds.  Lucky for […]

Inject more fish extracts before GC maintenance is needed using shoot-and-dilute GC

Persistent organic pollutants (POPs) like dioxins, furans, polychlorinated biphenyls (PCBs), and polybrominated diphenyl ether (PBDEs) are lipophilic and therefore may be found in fatty matrices like fish.  In order to remove the high lipid coextractives, lengthy cleanup procedures that require multiple cleanup cartridges are often used.  I recently presented work at the Dioxin meeting where […]

Shortcut: AOAC QuEChERS protocol

Here is our checklist style protocol based on the AOAC 2007.01 QuEChERS method. The document describes producing spiked samples at 10 ppb and no spiked samples that are used to determine incurred pesticides. Commodity samples that are not spiked as also used to product matrix-matched standards. During method development we usually test more than one […]

Analyzing pesticides in herbal tea using QuEChERS and GCxGC-TOFMS of course!

Herbal tea, a non-caffeinated drink made from plants, herbs, or spices has been used throughout history for its potential medicinal benefit.   Various herbal material is mixed depending on the desired medicinal or flavor properties for the tea.   As with any plant based commodity, there is the potential for pesticide residues to remain in the final […]

QuonFuseD by QuEChERS?

Currently the big push for sample prep is using QuEChERS, which stands for “Quick, Easy, Cheap, Effective, Rugged, and Safe”. It is a much more streamlined method, when compared to traditional liquid/liquid extractions and even SPE. Pesticide residues in various matrices are often analyzed by QuEChERS methodology, and today it is probably the most often […]