QuEChERS, standing for “quick, easy, cheap, effective, rugged and safe,” is a newly developed sample pretreatment technology for agricultural product detection in recent years. To have a quick and better understanding of QuEChERS, there are two main parts below that should be well known.
Procedures of QuEChERS
QuEChERS pre-treatment only requires two steps – extraction and purification. For the extraction stage, the extraction salt component consists of magnesium sulfate, sodium chloride, and other buffer salts.
Due to the salting-out effect, the water layer can be separated from the acetonitrile liquid. In this process, the extraction efficiency of different pesticides can be increased by adjusting the pH. In the purification stage, the sample will be stratified after high-speed centrifugation, which means that the uppermost layer is the acetonitrile layer where the target gets dissolved.
And then, take a certain amount of acetonitrile layer solution into the centrifuge tube where the dispersed purification adsorbent is added, such as PSA.
Advantages of QuEChERS
Compared with the other similar analytical technologies, one of the most noticeable advantages of the QuEChERS analytical approach is its high recovery rate for a wide range of pesticides with diverse chemical performances. The recovery rate for the samples is generally kept above 85%.
Besides, it is also featured for its rapid analytical speed. For instance, one single operator can finish the analysis for 6 samples just in half an hour. Also, it’s could be simply used with low cost, less contamination, and no chloride solvent.
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