SHIMSEN QuEChERS

Ceramic homogenizer, Compalible with 2 mL dSPE purification tube;Ceramic homogenizer, Compalible with 15 mL dSPE purification tube;SHIMSEN QuEChERS III, 15ml, PP Centrifuge Tube

• QuEChERS (Quick, Easy, Cheap, Effective, Rugged and Safe) was originally proposed by the US Department of Agriculture as a sample preparation method in 2003. • It has been applied to a variety of sample preparations, especially for pesticide residue pretreatment. • It's simpler, more economical, and faster than traditional methods.

• QuEChERS (Quick, Easy, Cheap, Effective, Rugged and Safe) was originally proposed by the US Department of Agriculture as a sample preparation method in 2003. • It has been applied to a variety of sample preparations, especially for pesticide residue pretreatment. • It's simpler, more economical, and faster than traditional methods.

The homogeneous sample is extracted with the help of acetonitrile. Samples with low water content (< 80 %)require the addition of water before the initial extraction to get a total of approximately 10 g of water. After addition of magnesium sulfate, sodium chloride and buffering citrate salts, the mixture is shaken intensively and centrifuged for phase separation. An aliquot of the organic phase is cleaned-up by dispersive solid phase extraction (D-SPE) employing bulk sorbents as well as magnesium sulfate for the removal of residual water. Following clean-up with amino-sorbents (e.g. primary secondary amin sorbent, PSA) extracts are acidified by adding a small amount of formic acid, to improve the storage stability of certain base-sensitive pesticides. The final extract can be directly employed for GC- and LC-based determinative analysis. Quantification is performed using an internal standard, which is added to the extract after the initial addition of acetonitrile.

The QuEChERS (quick, easy, cheap, effective, rugged, and safe) method uses a single-step buffered acetonitrile (MeCN) extraction and salting out liquid–liquid partitioning from the water in the sample with MgSO4. Dispersive-solid-phase extraction (dispersive-SPE) cleanup is done to remove organic acids, excess water, and other components with a combination of primary secondary amine (PSA) sorbent and MgSO4; then the extracts are analyzed by mass spectrometry (MS) techniques after a chromatographic analytical separation.