Description
Thermo Scientific™ QuEChERS Dispersive SPE products are designed to provide a Quick, Easy, Cheap, Effective, Rugged & Safe sample preparation technique for the extraction of multiple pesticides from food samples in compliance with AOAC and EU versions of the QuEChERS approach.
Thermo Scientific QuEChERS kits contain pre-packaged, ready-weighed salts, sorbents, and buffers to streamline your workflow and minimize the potential for error. The kits are grouped according to your analytes of interest, sample matrix, and preferred QuEChERS method:
Complete packages—including both extraction and clean-up kits—are available. Extraction-only and cleanup-only kits are also offered to suit your laboratory’s sample preparation needs. These pre-packaged kits save time and money, make QuEChERS procedures easier and more convenient, and ensure quality to yield reproducible results and excellent recoveries for a wide variety of analytes.
QuEChERS AOAC 2007.01 Method Clean-up Kits
These kits use dispersive solid phase extraction (dSPE) to purify supernatants obtained during extraction. Clean-up kits are available in prefilled 2 mL and 15 mL tube formats for the following matrices: general fruits and vegetables, pigmented fruits and vegetables, fruits and vegetables containing fats and waxes, and all other food types.
Chemicals used in the AOAC 2007.01 Method
| Acetonitrile | Used to perform single-phase extraction on a sample |
| Anhydrous MgSO4 | Induces phase separation between water content in sample and acetonitrile layer during liquid-liquid partitioning step; removes remaining water from sample during dispersive solid phase extraction (dSPE) step |
| NaOAc | Buffers the sample to stabilize pH |
| PSA | Primary secondary amine, used to remove polar matrix components, citric co-extractives, and free fatty acids, from sample during dispersive solid phase extraction (dSPE) step |
QuEChERS extraction and clean-up kits for EN 15662 method
The extraction and clean-up products here support the EN 15662 method. Widely used in Europe, the EN 15662 method was developed by Michelangelo Anastassiades and co-workers, who modified the original 2003 method to accommodate the use of citrate buffering at a relatively low buffering capacity. This variation uses a sodium chloride buffer to minimize polar interferences in addition to sodium citrate dihydrate and disodium citrate sesquihydrate buffers. Buffering is an important part of the QuEChERS procedure because it allows for analysis of pesticides and other residues that display pH dependence in their recoveries, depending on the sample matrix.
Chemicals used in the EN 15662 method
| Acetonitrile | Used to perform single-phase extraction on a sample |
| Anhydrous MgSO4 | Induces phase separation between water content in sample and acetonitrile layer during liquid-liquid partitioning step; removes remaining water from sample during dispersive solid phase extraction (dSPE) step |
| NaCl | Induces phase separation between water content in sample and acetonitrile layer during liquid-liquid partitioning step; removes residual water from sample |
| Trisodium Citrate | Buffers the sample to stabilize pH |
| Disodium Citrate Sesquihydrate | Buffers the sample to stabilize pH |
| PSA | Primary secondary amine, used to remove polar matrix components, citric co-extractives, and free fatty acids, from sample during dispersive solid phase extraction (dSPE) step |
| C18 | Removes fats, sterols, and other non-polar interferences from sample |
| GCB | Graphitized carbon black, removes pigment (not recommended for use with planar pesticides) |
QuEChERS clean-up kit for NY/T 1380-2007 method
The NY/T 1380-2007 method is recommended by China Ministry of Agriculture for the QuEChERS Method sample preparation of 51 specific pesticide residues in fruits and vegetables with analysis by GC-MS.
Chemicals used in the NY/T 1380-2007 method
| Anhydrous MgSO4 | Induces phase separation between water content in sample and acetonitrile layer during liquid-liquid partitioning step; removes remaining water from sample during dispersive solid phase extraction (dSPE) step |
| PSA | Primary secondary amine, used to remove polar matrix components, citric co-extractives, and free fatty acids, from sample during dSPE step |
| C18 | Removes fats, sterols, and other non-polar interferences from sample |
