Food commodities that varied in water, fat, and pigment content were fortified with pesticides and
processed using aQuEChERS sample preparation technique. Samples were analyzed by both
GCxGC-TOFMS and LC-MS/MS, and good recoveries were obtained for most pesticides inmost
commodities.
The unique selectivity and high retention of Biphenyl columns produce complete separation of
sulfonamide residues and benefit both UV and MS detection. In addition, Biphenyl columns in a UHPLC
format allow faster sample throughput when testing for these antibiotics.
Increase Data Quality for Sulfonamide Residue Analysis by HPLC
and UHPLC Using Unique Biphenyl Column Selectivity
Column selectivity has themost significant influence on chromatographic peak separation, or
resolution, so choosing the right column can greatly speed up HPLC and UHPLCmethod development.
In this article, we discuss column choice and identify a set of just 4 stationary phases—Restek’s USLC
column set—that encompasses thewidest range of reversed phase selectivity available today.
USLC Columns Put the Right Tools in Your LCMethod Development
Toolbox
QuEChERS extraction, dSPE cleanup, and GC-TOFMS analysis were used to assess pesticide residue
levels in strawberry and spinach from both commercial and Amish growers. Various dSPE sorbent
products were compared to determinewhich weremost effective.
Comparing Pesticide Residues in Amish and Commercially Grown
Strawberries and Spinach Using QuEChERS, Various dSPE Sorbents,
and GC-TOFMS
The novel approach used here combines QuEChERS extraction, cartridge SPE cleanup, and
GCxGC-TOFMS analysis, resulting in good recoveries for awide range of pesticides in dietary
supplements. Matrices include dandelion root, sage, and amulti-herb finished product.
Determining Pesticides in Dietary Supplements with QuEChERS
Extraction, Cartridge SPE, and GCxGC-TOFMS
QuEChERS solid phase extraction cartridges. SPE tubes, columns, and reference standards for fast,
simple extraction, cleanup, and analysis of pesticide residue samples. Designed for AOAC and European
methods. (PDF - 123kB)
Q-sep™New Product Supplement
The recent establishment of a 1Mg/g safety threshold formelamine in infant foods has led to an
immediate need formore sensitivemethods. Herewe established GC/MS conditions for highly
reproducible analyses and evaluated the effectiveness of both solvent-based andmatrix-matched
standards. Using thismethod, melamine and cyanuric acid were reliably detected at and below 1Mg/g
in infant formula.
Meet New Requirements for Melamine Analysis at 1Mg/g in Infant
Formula
Analysis of pesticide residues in foods is complicated by the large number of target compounds.
LC-MS/MS analysis using an Aqueous C18 column providesmore comprehensive results than GC alone.
Comprehensive Pesticide Residue Analysis by LC-MS/MSUsing an
Ultra Aqueous C18 Column
QuEChERS is a simple, effective approach to sample prep that can be applied to the analysis of
pesticides in dietary supplements. Here we demonstrate aQuEChERS, cSPE, GC-TOFMS procedure that
results in good recoveries for awide range of pesticides in dandelion root. (PDF - 5523kB)
Developing NewMethods for Pesticides in Dietary Supplements
QuEChERS dSPEmethods simplify extract cleanup, reducematerial costs, and improve sample
throughput. Herewe demonstrate the effectiveness of QuEChERS sample cleanup using amultiresidue
analysis of pesticides on strawberries. (PDF - 158kB)
Fast, Simple QuEChERS Extraction and Cleanup of Pesticide Residue
Samples
Thermal desorption offers an automatic, high-sensitivity alternative to conventional liquid extraction
methods for aroma profiling by GC/MS. It allows vapor profile constituents to be cleanly separated from
the samplematrix and often facilitates selective purging of volatile interferences. This ensures that the
vapor profile analyzed ismost representative of the aroma perceived by consumers and that key
compounds can be identified andmeasured at the lowest levels possible.
Using Thermal Desorption to Enhance Aroma Profiling by GC/MS
Rapid Screening Method for Carbamates in Orange Oil
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