QuEChERS Performance Standards Kit
Designed for use in all QuEChERS methods for pesticides in fruits and vegetables, including the original unbuffered method, AOAC 2007.1, and EN15662. Kit contains organochlorine, organonitrogen, organophosphorus, and carbamate fungicides and insecticides commonly used on fruits and vegetables. Volatile, polar, active, base-sensitive, and nonvolatile compounds are included to allow comprehensive evaluation of QuEChERS extracti…
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Designed for use in all QuEChERS methods for pesticides in fruits and vegetables, including the original unbuffered method, AOAC 2007.1, and EN15662.
Kit contains organochlorine, organonitrogen, organophosphorus, and carbamate fungicides and insecticides commonly used on fruits and vegetables. Volatile, polar, active, base-sensitive, and nonvolatile compounds are included to allow comprehensive evaluation of QuEChERS extraction and cleanup efficiencies, and optimization of GC and LC instrumental conditions.
QuEChERS Performance Standards Kit Features:
- Ideal for initial method evaluations and ongoing method performance validations.
- Analytes are divided into three ampuls based on compatibility for maximum stability and shelf life.
- Precise formulations improve data quality and operational efficiency; spend more time running samples and less time sourcing and preparing standards.
- Quantitatively analyzed to confirm the composition and stability of each mixture.
- Produced and tested in accordance with ISO Guide 34 and 17025 accreditation.
An introduction to low-pressure GC-MS (LPGC-MS)
Low-pressure GC-MS (LPGC-MS) is a technique that uses the MS vacuum system, along with a specially designed column setup, to lower pressure inside the entire column, thereby significantly speeding up analysis. In addition to the speed benefit, LPGC-MS can also provide a cost saving by dramatically reducing helium consumption. Explore how to utilize LPGC-MS and specially designed, pre-connected LPGC column kits from Restek to speed up gas chromatographic analyses. Discover how the LPGC column kit can be used for vacuum-outlet GC-MS, easily increasing your instrument's productivity.
Mitigating Matrix Effects: Examination of Dilution, QuEChERS, and Calibration Strategies for LC-MS/MS Analysis of Pesticide Residues in Diverse Food Types
Liquid chromatography tandem mass spectrometry is popular for monitoring pesticide residues in food. The increased selectivity and sensitivity of LC-MS/MS have impacted how multi-residue methods are performed, sometimes decreasing the need for rigorous sample preparation. However, this approach suffers from matrix effects causing poor data quality and difficult quantification. Matrix effects can be mitigated by sample preparation that reduces the concentration of co-extracted matrix material or by experimental strategies like matrix-matched calibration that compensate for matrix effects. This white paper considered these two aspects of multi-residue methods, sample preparation and calibration strategies, in order to determine recommendations that balanced data quality as well as time and financial investments.
Comparing Pesticide Residues in Amish and Commercially Grown Strawberries and Spinach
In this application note, QuEChERS extraction, dSPE cleanup, and GC-TOFMS analysis were used to assess pesticide levels in strawberries and spinach from both commercial and Amish growers. Various dSPE cleanup products were compared to determine which were most effective. Good recoveries were obtained for most pesticides; however, low recoveries were observed for some base-sensitive or planar compounds. Incurred pesticides were generally low and varied by both matrix and source.
Multiresidue Pesticides in QuEChERS Extracts of Finished Tobacco Using GCxGC-TOFMS
In this application note, the QuEChERS sample preparation approach was used to isolate residues prior to analyzing pesticides in tobacco. The cleanup efficacy and pesticide recoveries were evaluated for different formulations of QuEChERS dispersive solid phase extraction (dSPE) cleanup and the more traditional cartridge solid phase extraction (cSPE) cleanup. Comprehensive two-dimensional gas chromatography time-of-flight mass spectrometry (GCxGC-TOFMS) was used to determine pesticide residues in the resulting extracts.
