Gerstel: Intelligent Automation for GC/MS and LC.MS

52nd Annual North American Chemical Residue Workshop (NACRW)

July 19-22, 2015



TradeWinds Island Grand

5500 Gulf Blvd

St. Pete Beach, FL 33706

What to Expect: 

This annual meeting is for scientists particularly interested in trace level analysis of pesticides, veterinary drug residues, and other chemicals in food, animal feed, and environmental samples. It's purpose is to provide training, develop and improve technical knowledge, facilitate development and distribution of new analysis methods and techniques, and establish networking to promote professional cooperation between scientists of these interests.

When you think about your GC/MS analysis, where do you find the biggest bottleneck? Stop by booth #21 to learn how to increase efficiency by "GERSETELizing" your GC/MS process with our automated liner exchange. We will also be presenting a poster, "Cleanup of QuEChERS Extracts using SBSE for LC/MS/MS Determination of Pesticides in Food Products." (P-53) The complete description of this poster can be found under the register now button. 

If you are looking for more information regarding the event, please see the NACRW website

button (1).png

Poster Description for "Cleanup of QuEChERS Extracts using SBSE for LC/MS/MS Determination of Pesticides in Food Products"

"One of the most important aspects of reducing pesticide exposure is monitoring of pesticide residues in foods. A number of analytical methods have been developed, many of them based on traditional liquid-liquid extraction in combination with GC-MS or LC-MS. The QuEChERS (quick, easy, cheap, effective, rugged, and safe) sample preparation methods have been developed to help monitor pesticides in a range of food samples. The dispersive Solid Phase Extraction (SPE) used to clean up these extracts can leave co-extractants which can result in interferences such as ion suppression with the analytical results.

Stir bar sorptive extraction (SBSE) is a sorptive extraction technique based on polydimethylsiloxane (PDMS) coated stir bars. SBSE was developed to concentrate nonpolar analytes from aqueous solutions, and has recently been shown to effectively extract and concentrate PAHs from QuEChERS extracts while eliminating matrix interference for GC/MS analysis.

In this study we describe the potential benefits of using SBSE to concentrate pesticides from QuEChERS extracts and provide additional clean-up from matrix interferences during LC/MS/MS. Pesticides concentrated on the SBSE phase were recovered by liquid desorption providing better analytical sensitivity for the pesticides being monitored with reduced matrix interference. Manual steps such as evaporation, reconstitution, and dilution as well as the subsequent LC/MS/MS analysis of the final extracts can be automated to improve laboratory productivity for monitoring pesticide residues in foods."