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Developing New Methods for Pesticides in Dietary Supplements (PDF 4634kB)

... technicians. Here we demonstrate a procedure that incorporates a QuEChERS extraction, cSPE cleanup .Thus,we compared dSPE to a cartridge solid phase extraction (cSPE) cleanup and established a procedure that uses ... dietary supplements, quechers, cSPE, GMP, PAM 303, pesticides, multiresidue, sample prep...

High Quality Analysis of Pesticides in Marijuana Using QuEChERS, Cartridge SPE Cleanup, and GCxGC-TOFMS (PDF 672kB)

..., we combined a simple QuEChERS extraction approach with cartridge SPE (cSPE) cleanup, followed from the QuEChERS extraction tube for subsequent cSPE cleanup prior to analysis with GC or LC (Figure...

Determining Pesticides in Dietary Supplements with QuEChERS Extraction, Cartridge SPE, and GCxGC-TOFMS (PDF 1695kB)

....In recent work [1],we used a QuEChERS extraction method [2] with cartridge solid phaseextraction (cSPE samples,matrix interferences were substantially reduced by using the high-er capacity cSPE cleanup ... Pesticide, dietary supplement, cartridge SPE, GCxGC, TOFMS, GCxGC-TOFMS, QuEChERS, cSPE...

Pesticides in Dietary Supplements: Advantages of QuEChERS vs. PAM 303

....   PAM 303 Method QuEChERS + cSPE Benefits of QuEChERS + cSPE , standards, and cSPE cartridges are ready to use.Highly reproducible; less manual prep means less ... PAM 303, SPE, cSPE, QuEChERS, pesticides, multiresidue, dietary supplements, sample prep...

Evaluation of Dispersive and Cartridge Solid Phase Extraction (SPE) Cleanups for Multiresidue Pesticides in QuEChERS Extracts of Finished Tobacco Using GCxGC-TOFMS (PDF 4409kB)

... extraction (dSPE) cleanup and the more traditional cartridge solid phase extraction (cSPE) cleanup EChERS extraction and a cartridge solid phase extraction cleanup (cSPE). The cSPE cleanup provides the potential...

Determining Pesticides in Dietary Supplements with QuEChERS Extraction, Cartridge SPE, and GCxGC-TOFMS

...EChERS extraction method [2] with cartridge solid phase extraction (cSPE) cleanup to prepare dietary supplement substantially reduced by using the higher capacity cSPE cleanup, and recoveries for a wide range of pesticides ... The novel approach used here combines QuEChERS extraction, cartridge SPE cleanup, and GCx ... "dietary supplements", "cartridge SPE", GCxGC, GCxGC-TOFMS, Pesticides, QuEChERS, cSPE, GC-TOFMS...

ChromaBLOGraphy: MM’s QuEChERS cSPE GCxGC-ECD of PCBs and PBDEs at FPRW, or, Why Does this Blog Title Only Consist of Acronyms?

I only have time for a brief report from the Florida Pesticide Residue Workshop as I get ready to go to a full day of talks and meetings.  Michelle Misselwitz of Restek’s Innovations group presented the poster, “The QuEChERS Extraction Approach and Comprehensive Two-Dimensional Gas Chromatography of Halogenated Persistent Organic Pollutants in Cow Milk and [...]

ChromaBLOGraphy: The Impact of a Dirty Marijuana Extract on Pesticide Recoveries from a Splitless GC Inlet

In a previous post I told you about our experimentation with marijuana (that didn’t sound right…) and pesticide extraction via QuEChERS.  An important part of that work was cartridge solid phase extraction (cSPE) cleanup with 500mg CarboPrep 90 / 500 mg PSA cartridges.  To minimize losses of planar pesticides (e.g hexachlorobenzene), which we know can [...]

High-Quality Analysis of Pesticides in Cannabis Using QuEChERS, Cartridge SPE Cleanup, and GCxGC-TOFMS

... a simple QuEChERS extraction approach with cartridge SPE (cSPE) cleanup, followed by GCx EChERS extraction tube for subsequent cSPE cleanup prior to analysis with GC or LC (Figure 1 ... challenging due to matrix complexity. The use of QuEChERS, cartridge SPE cleanup, and GCxGC-TOFMS as presented...

ChromaBLOGraphy: Are fatty acids overwhelming your QuEChERS dSPE PSA cleanup and causing issues in your GC analysis? Get more cleanup capacity with cartridge SPE cleanup!

Fatty acids are important molecules in the human body because they are used as a source of fuel.  There are many food sources of both “healthy” and “unhealthy” fatty acids.  Many sources of dietary fatty acids come from fruits, vegetables, seeds, nuts, and animal fats.  The QuEChERS methodology was developed to analyze pesticides in fruits […]

News: Developing New Methods for Pesticides in Dietary Supplements

Author(s): Julie Kowalski, Michelle Misselwitz, Jason Thomas,  Jack Cochran Published By: Food Safety Magazine Issue: February/March 2012 Year of Publication: 2012 Link: http://www.foodsafetymagazine.com/article.asp?id=3876&sub=sub1 Abstract: New requirements for dietary supplements to be manufactured under current Good Manufacturing Practices (cGMP) regulations have created a … Continue reading

News: QuEChERS, GC Smoke Out Tobacco Pesticides

Author(s): Michelle Misselwitz, Jack Cochran, Julie Kowalski Restek Corporation Published By: Chromatography Techniques Year of Publication: 2014 Link: http://www.chromatographytechniques.com/articles/2013/12/quechers-gc-smoke-out-tobacco-pesticides Abstract: Pesticides are used heavily on tobacco in order to increase crop production value; however, limited regulation creates the potential for high … Continue reading

News: Evaluation of Dispersive and Cartridge Solid Phase Extraction (SPE) Cleanups for Multiresidue Pesticides in QuEChERS Extracts of Finished Tobacco Using GCxGC-TOFMS

Author(s): Michelle Misselwitz, Jack Cochran, and Julie Kowalski Restek Corporation Published By: Restek Corporation Year of Publication: 2013 Link: http://www.restek.com/Technical-Resources/Technical-Library/Foods-Flavors-Fragrances/fff_FFAN1823-UNV Abstract: Tobacco is a high-value production crop for the United States and ranks 6th in the amount of pesticides applied per … Continue reading

News: Analysis of Pesticides in Dietary Supplements: Evaluation of QuEChERS, Cartridge SPE Clean-Up, and Gas Chromatography Time-of-Flight Mass Spectrometry

Author(s): Julie Kowalski, Michelle Misselwitz, Jason Thomas, Jack Cochran Published By: Agro FOOD INDUSTRY Hi-tech today Issue: Sept./Oct. Focus on Food Analysis supplement, vol. 22, no. 5 Year of Publication: 2011 Link: http://agro-food-industry.teknoscienze.com/testata.asp?id_testata=244&folder=supplements Abstract: New requirements for dietary supplements to … Continue reading

Evaluation of Dispersive and Cartridge Solid Phase Extraction (SPE) Cleanups for Multiresidue Pesticides in QuEChERS Extracts of Finished Tobacco Using GCxGC-TOFMS

... extraction (dSPE) cleanup and the more traditional cartridge solid phase extraction (cSPE) cleanup EChERS extraction and a cartridge solid phase extraction cleanup (cSPE). The cSPE cleanup provides the potential ... We compared the efficacy of dSPE and cSPE cleanup methods for multiresidue pesticide analysis of Qu EChERS extracts of finished tobacco products using GCxGC-TOFMS. Cleanup with dSPE tubes containing 7.5 mg of GCB...

News: Presentations Announced for AOAC 2012

The AOAC annual meeting is fast approaching. Beginning this Sunday, September 30th and running through next Wednesday, October 3rd, the 2012 AOAC meeting in Las Vegas, Nevada promises to be another exciting conference. The final program has been announced and … Continue reading

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dSPE vs. cSPE Sample Cleanup of Dandelion Root Powder (Dietary Supplement) on Rxi-5Sil MS

GC_FF1171

Column: Rxi-5Sil MS, 30 m, 0.25 mm ID, 0.25 µm (cat.# 13623)
Injector: Splitless
Detector: MS-Scan

Carfentrazone Ethyl in Dandelion Root Powder (Dietary Supplement) on Rxi-5Sil MS

GC_FF1172

Column: Rxi-5Sil MS, 30 m, 0.25 mm ID, 0.25 µm (cat.# 13623)
Injector: Splitless
Detector: MS-Scan

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