Method for fast analyzing pesticide residue in fruits and vegetables
A technology with many pesticide residues and rapid analysis, applied in the field of food testing, can solve the problems of low sample preparation efficiency, restricting detection efficiency, time-consuming and labor-intensive problems, and achieve the effect of simple operation, less solvent consumption, and avoiding losses
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[0026] Example 1, a rapid analysis method for multiple pesticide residues in fruits and vegetables. Taking green asparagus as an example, 130 kinds of pesticide mixed standard solutions were prepared, and 0.01 mg / kg and 0.1 mg / kg pesticide standard products were added for recovery. Repeat 4 times for each content level, then extract, weigh 15.0g of uniformly prepared sample, add to a 50mL centrifuge tube containing 1.5g anhydrous sodium acetate and 6g anhydrous magnesium sulfate, then add 15mL 1% acetate acetonitrile solution, vigorously After shaking for 1 min, ultrasonic extraction for 15 min, centrifugation at 5000 r / min for 1 min; purification, transfer 10 mL of acetonitrile extract to 15 mL centrifuge tubes with mixed packing in different proportions, packing 500mg PSA and graphitized carbon with a mass ratio of 1:1. Shake for 1 min, centrifuge at 5000r / min for 1 min, draw 5 mL of the purified solution, concentrate and evaporate to dryness. The volume ratio of acetonitrile an...
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[0038] Example 2, a rapid analysis method for multiple residues of pesticides in fruits and vegetables. Taking edamame as an example, 28 kinds of pesticide mixed standard solutions were prepared and recovered at a level of 0.02mg / kg. Each content level was repeated 4 times, and then extracted , Weigh 15.0g of the uniformly prepared sample, add it to a 50mL centrifuge tube containing 1.5g of anhydrous sodium acetate and 6g of anhydrous magnesium sulfate, then add 15mL of 1% acetate acetonitrile solution, shake vigorously for 1min, ultrasonic extraction for 15min, 5000r Centrifuge for 1 min per min; purify, transfer 10 mL of acetonitrile extract to 15 mL centrifuge tubes with mixed fillers in different proportions. Fillers are 500 mg graphitized carbon, PSA, and C18 in a mass ratio of 1:2:2. Mix, shake for 1 min, 5000r Centrifuge for 1 min at / min, draw 5 mL of the purified solution, concentrate and evaporate to dryness. The volume ratio of acetonitrile to water is 1:1 to a constant...
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