The pesticide is used more during the growth and storage of crops, and the widespread use of pesticides can cause residues on crop products to enter the human body through the food chain, thereby endangering human health. As food safety issues become more prominent, governments and related agencies have developed residue limits for a variety of pesticides on different crops.
Among them, the International Tobacco Scientific Research Collaborating Center formulated the Guiding Limits for pesticide residues in tobacco in 2003, a total of 99 pesticides; and then revised and expanded in 2008, now contains 118 Kind of pesticide.
The increase of pesticide types and the strictness of the limit indicators have proposed five series of standards for the analysis and detection of various pesticide residues in tobacco. The first three are multi-pesticide residue analysis methods, which contain about 160 kinds of pesticides. The detection means used mainly include gas chromatography (GC), gas chromatography-mass spectrometry (GC-MS), and liquid chromatography-tandem mass spectrometry (LC-MS/MS).
QuEChERS method
The pretreatment method is mostly based on the QuEChERS method, which is characterized by infiltration of the pulverized tobacco sample, extraction with acetonitrile, the addition of a salting-out package, centrifugation, and adsorption with N-propylethylenediamine (PSA) to purify. Since 2003, QuEChERS and its improved methods have been widely used in the analysis of various pesticide residues in substrates such as vegetables, fruits, grains, tea, and tobacco.
The pretreatment method is mostly based on the QuEChERS method, which is characterized by infiltration of the pulverized tobacco sample, extraction with acetonitrile, the addition of a salting-out package, centrifugation, and adsorption with N-propylethylenediamine (PSA) to purify. Since 2003, QuEChERS and its improved methods have been widely used in the analysis of various pesticide residues in substrates such as vegetables, fruits, grains, tea, and tobacco.
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