A recent presentation by Stephen Lehotay of the USDA explained the use and benefits of the QuEChERS technique. It is a excellent primer and a review of the state of the art in QuEChERS. Both the webinar and the presentation are linked here.
Dual-Phase SPE QuEChERS method with CarbonX/PSA for use in Cleanup of 18 Pesticide Residues in Spinach Analyzed by GC/MSUnited Science
Conor Smith, Ph.D. Introduction: A new modified Schenck SPE QuEChERS method is described below. This method employs a pass-through SPE method and gives good recoveries of 18 GC/MS amenable pesticides while removing the pigment from the spinach extract. Reagents and Chemicals: United Science Dual Phase QuEChERS tubes with 500 mg CarbonX for QuEChERS and 500 mg of PSA (P/N 1605344173) were used for sample cleanup. Spectral grade Acetonitrile (ACN) from MPBio was used along with glacial acetic acid from Ampresco. Method: Initially, [...]
A summary of some of CarbonX for QuEChERS properties and capabilities A .pdf can be downloaded here.
Analysis of 16 Pesticide Residues in Broccoli Using CarbonX dSPE QuEChERS AOAC Kits Using GC/MS Authors: Conor Smith, Doug Fryer United Science Corp. 15911 Furuby Rd. Center City,MN55012 USA Abstract This application note describes the use of a quick, easy, cheap, effective, rugged, and safe (QuEChERS) AOAC sample preparation technique used in the extraction and cleanup of 16 pesticide residues in broccoli. The pesticides are all amenable to GC/MS analysis. The method involves the extraction of the pesticides from homogenized broccoli with a buffered aqueous/acetonitrile solvent system [...]
Ok. So you want to cut to the chase and find out what is the big deal. Well, here it is: For QuEChERS: 1. CarbonX materials give high planar pesticide recovery without having to use toluene. So what? Well you can skip many of the steps required for planar pesticide recovery saving both time and money. In addition, you will not have to wait a long time for the toluene to evaporate. 2. CarbonX materials have been shown to remove 50% more matrix [...]
Solid Phase Extraction (SPE) of Pesticide Residues with CarbonX for QuEChERS INTRODUCTION Graphitized carbon black (GCB) is a sorbent that is widely used in solid phase extraction (SPE) to extract polar and non-polar pesticides/compounds from water samples. GCB struggles with planar pesticides such as Chlrothalonil in this type of application. CarbonX for QuEChERS on the other hand demonstrates excellent recoveries of water soluble pesticides including planar pesticides such as Chlorothalonil. 1. SAMPLES Water sample 2. SUMMARY OF PROCEDURE Extract pesticides including one planar pesticide in water [...]
United Science is to test market its recently introduced carbon on silica to select end users for evaluation and feedback on its performance compared to carbon sorbents currently in use.