LC-Q-TOF/MS detection technology for 544 pesticide residues in stem vegetables
A Q-TOF, pesticide residue technology, applied in the fields of food hygiene and agricultural product safety testing, can solve the problems of high price, loopholes in food safety monitoring, and the validity period is only 2 or 3 years, and achieves the effect of large amount of information
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[0060] An implementation example of LC-Q-TOF / MS detection and confirmation technology for 544 pesticides (see Table 1) in stem vegetables (taking asparagus as an example), including the following steps:
[0061] 1. Specific steps of sample pretreatment technology:
[0062] 1.1 Take the edible part of the asparagus sample, chop it up, mix it evenly, seal it, and mark it;
[0063] 1.2 Weigh 10g of asparagus sample (accurate to 0.01g), add 40mL of 1% acetic acid acetonitrile into an 80mL centrifuge tube, use a high-speed homogenizer at 13500r / min, homogenize and extract for 1min, add 1g of sodium chloride, 4g of anhydrous magnesium sulfate , shake for 5 min, centrifuge at 4200 r / min for 5 min, take 20 mL of the supernatant, concentrate it to about 1 mL by rotary evaporation in a 40°C water bath, and wait for purification.
[0064] 1.3 in Carbon / NH 2 Add about 2cm high anhydrous sodium sulfate to the column. Rinse the SPE column with 4 mL of acetonitrile + toluene (3+1, v / v) fi...
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