Method for determining residual amount of fluoride ether bacterium amide in vegetables and fruits
A technique for the determination of Fluorbactyramide and its determination method, which is applied in the field of determination of Fluorbactyl amide residues, to achieve the effects of ensuring people's food safety, avoiding matrix interference, and good repeatability
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Embodiment 1
[0033] Example 1: Detection of fluoxetin residues in apples
[0034] (1) Sample pretreatment
[0035] Weigh 10.0 g of well-mixed apples into a 50 mL centrifuge tube, accurately add 20 mL of acetonitrile, extract homogeneously for 1 min, add 3 g of anhydrous magnesium sulfate and 2 g of sodium chloride, vortex for 1 min, and centrifuge at 7000 r / min for 5 min. After centrifugation, take 6mL of acetonitrile extract and transfer to a solution containing 900mg anhydrous magnesium sulfate, 300mg C 18 and 150mg PSA in a centrifuge tube, vortex for 1min, and centrifuge at 5000r / min for 5min. Take 4 mL of the supernatant in a nitrogen blowpipe, dry it with nitrogen at 40°C, add acetone / n-hexane mixed solvent with a volume ratio of 1 / 1 to dissolve the residue, vortex and mix evenly, pass through the membrane, and transfer it to the sample bottle for GC- NCI-MS assay.
[0036] (2) Preparation of standard working solution
[0037]Accurately weigh 25±0.1mg of the standard product in a...
Embodiment 2
[0063] Example 2: Detection of fluoxetin residues in dehydrated green peppers
[0064] (1) Sample pretreatment
[0065] Weigh 2.0 g of fully mixed dehydrated green peppers into a 50 mL centrifuge tube, add 5 mL of water for resuscitation for 30 min, accurately add 20 mL of acetonitrile solution containing 1% acetic acid, extract homogeneously for 1 min, add 3 g of anhydrous magnesium sulfate, 2 g of sodium acetate and 2mL of water, vortexed for 1min, centrifuged at 7000r / min for 5min. After centrifugation, take 6mL of acetonitrile extract and transfer to a solution containing 900mg anhydrous magnesium sulfate, 300mg C 18 and 150mg PSA in a centrifuge tube, vortex for 1min, and centrifuge at 5000r / min for 5min. Take 4mL of the supernatant in a nitrogen blowpipe, dry it with nitrogen at 40°C, add acetone / n-hexane mixed solvent with a volume ratio of 1 / 1 to dissolve the residue, vortex and mix well, then transfer it to the sample bottle to wait for GC-NCI - MS determination. ...
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