About The Establishment Of QuEChERS
Before QuEChERS born
In 1989, Barker et al. first proposed matrix solid-phase dispersion (MSPD technology) which can simultaneously disperse and extract solid and semi-solid samples. This method grinds the solid-phase extraction material coated with various polymers such as C18 with the sample and takes it as packing, and elute various analytes with different solvents.
This technology concentrates the process of sample homogenization, extraction, purification, etc. in traditional sample preparation; it reduces tissue homogenization, sedimentation, and centrifugation. , pH adjustment and sample transfer steps; avoid the loss of samples, and gradually become widely used in various fields.
QuEChERS method born
In 2003, the US Department of Agriculture Food and Drug Administration and the Slovenian Public Health Institute jointly developed a new sample pretreatment technology based on matrix solid-phase dispersion technology. A method based on solid-phase extraction and matrix solid-phase dispersion was proposed by Anastassiades and Lehotay.
The technical detection method is a sample pretreatment technology with the characteristics of quick, easy, cheap, effective, rugged and safe, etc., named the QuEChERS method. The method was announced and soon became widely used.
Principle of QuEChERS
QuEChERS method utilizes acetonitrile to extract pesticide residues in the sample, and the salt is separated by sodium chloride and anhydrous magnesium sulfate, and the extract is purified by anhydrous sodium sulfate and PSA (N-propyl ethylenediamine filler dispersed solid-phase extraction. The multi-residue analysis was performed using GC, GCIIMS, and the like.
Buffered QuEChERS method
The QuEChERS method is essentially the combination and derivation of solid-phase extraction technology and matrix solid-phase dispersion technology. In 2004, in order to improve the recovery rate of certain alkali-sensitive pesticides, Lehotay et al. proposed a buffered QuEChERS method, which uses 0.1% acetic acid as the extract, acetonitrile is used instead of sodium chloride as a salting-out agent. The pH of the aqueous and organic phases is controlled by the sodium acetate buffer system to improve the recovery of pesticides such as chlorothalonil.
Studies have shown that the QuEChERS method can detect more than 200 pesticides simultaneously, as well as fat-containing media systems. It has a promising future and will be applied to more different fields.
Property of QuEChERS
Hawach Scientific QuEChERS adopts efficient analysis software to meet the most stringent analytical application requirements for performance, reliability and results in different fields such as food, environment, pharmaceutical, industry and scientific research.
Compared with conventional QuEChERS, Hawach commits to retain the classical and reliable valve quantitative ring technology while innovate transmission line connection, the unique technique is used to improve analysis efficiency and experimental repeatability. A variety of automatic switching of any injection mode is adopted to enhance experimental efficiency and automation. And the new design brings high sensitivity and durability.
Selective guidance of QuEChERS
To meet the wide range of QuEChERS product options, Hawach supplies a wide selection of applications featuring the QuEChERS approach. A handy index lets you search this guide based on practical needs and analytic class. In application, choose the extraction salt packet based on your method of analysis, select the dispersive SPE kit suited to the type of sample being analyzed and the method you are following. The same homogenizers available in QuEChERS kits are also available for bulk purchase, providing excellent grinding capabilities of target samples.