Why QuEChERS Is Getting More And More Popular?
QuEChERS are widely used in sample handling before food safety inspection. And food safety inspection is vitally important to our life and health. Today, here we are going to talk about the QuEChERS rationale and some relating aspects.
Pesticide residue analysis
Pesticide residue analysis is a complex trace analysis technique. The traditional pretreatment methods mainly include soxhlet extraction, oscillatory extraction, liquid-liquid partitioning, column chromatography, and centrifugation. These methods have the disadvantages of single sample extraction, long purification time, the large amount of toxic organic solvent, low sample recovery rate, and large impact on human health and environment, which can not meet the needs of pesticide analysis in modern batch foods.
At the same time, the composition of various foods is complex, which increases the difficulty of analysis and puts forward more stringent requirements for pesticide residue detection technology.
At present, new technologies that have been reported or have been widely used include solid-phase extraction SPE, solid-phase microextraction SPME, supercritical fluid extraction SFE, ultrasonic extraction USE, microwave-assisted extraction MAE, rapid solvent extraction ASE, matrix solid-phase dispersion extraction MSPD, gel permeation chromatography GPC, molecularly imprinted synthetic receptor technology MISR, and the like.
Although these new technologies are efficient, fast, safe, and simple, and have less environmental pollution, they still cannot meet the technical requirements for the simultaneous detection of most pesticides and achieving better quality.
(1) QuEChERS is a multi-class and multi-residue analysis method for the determination of pesticides in high water content (80%-95%) samples. In food and environmental samples, one of the problems in the analysis of multi-residue pesticides is that the residual pesticides have a variety of chemical properties. At the same time, complex sample matrices may contain large amounts of chlorophyll, oils, sterols, and other ingredients. These may affect the results of the assay. The use of the QuEChERS method can reduce the impact of such problems;
(2) The method has good stability, high precision, and a high recovery rate. The addiction recovery rate for a large number of polar and volatile pesticides is greater than 85%;
(3) Correction with the internal standard method, high precision, and accuracy;
(4) Short analysis time, it can complete 10-20 pre-weighed sample determination in 33-40 minutes;
(5) The solvent is used in a small amount, featuring low cost, small pollution, and the chloride-containing solvent is not used;
(6) Easy to use, it can be done well without good training and high skill;
(7) Very few glassware are used in the test process, and the equipment used in the sample preparation process is simple and requires little space. It can be completed in a small and mobile lab;
(8) The method has very strict requirements, and the organic acid is removed during the purification process.