Preparation method and application of molecularly imprinted solid phase extraction small column for separating pyrethroid pesticide
A technology of pyrethroids and solid-phase extraction cartridges, applied in the field of analysis and detection, to achieve the effects of low cost, high selectivity and sensitivity, and high purification efficiency
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Embodiment 1
[0022] Preparation of molecularly imprinted polymers for pyrethroid pesticides:
[0023] Cypermethrin is used as a template molecule, methacrylic acid (MAA) is used as a functional monomer, ethylene glycol dimethacrylate (EGDMA) is used as a crosslinking agent, and the molar ratio of template molecule: functional monomer: crosslinking agent is 1:5 : 25, template molecules, functional monomers, cross-linking agents, initiators and porogens were added into the reactor, and bulk molecularly imprinted polymers were obtained after polymerization by bulk polymerization. The ratio of the initiator to the crosslinking agent is 4 mg / mmol; the volume ratio of the porogen to the crosslinking agent is 1:10.
[0024] Grind and sieve the obtained massive molecularly imprinted polymers to obtain particles with a particle size of about 40 μm. The template molecules are removed by Soxhlet extraction using a mixed solution of methanol formic acid and methanol with a volume ratio of 9:1, and the...
Embodiment 2
[0036] Preparation of molecularly imprinted polymers for pyrethroid pesticides:
[0037]With cypermethrin as template molecule, methacrylic acid (MAA) as functional monomer, ethylene glycol dimethacrylate (EGDMA) as cross-linking agent, according to template molecule: functional monomer: cross-linking agent molar ratio=1:2 : 25, template molecules, functional monomers, cross-linking agents, initiators and porogens were added into the reactor, and bulk molecularly imprinted polymers were obtained after polymerization by bulk polymerization. The ratio of the initiator to the crosslinking agent is 3 mg / mmol; the volume ratio of the porogen to the crosslinking agent is 1:6.
[0038] The obtained massive molecularly imprinted polymer was ground and sieved to obtain particles with a particle size of 50 μm, and the template molecules were removed by Soxhlet extraction using a mixed solution of methanol, formic acid and methanol at a volume ratio of 9:1, and then placed in a vacuum dr...
Embodiment 3
[0050] Preparation of Molecularly Imprinted Polymers for Pyrethroid Pesticides
[0051] With cypermethrin as template molecule, methacrylic acid (MAA) as functional monomer, ethylene glycol dimethacrylate (EGDMA) as cross-linking agent, according to template molecule: functional monomer: cross-linking agent molar ratio=1:8 : 25, template molecules, functional monomers, cross-linking agents, initiators and porogens were added into the reactor, and bulk molecularly imprinted polymers were obtained after polymerization by bulk polymerization. The ratio of the initiator to the crosslinking agent is 5 mg / mmol; the volume ratio of the porogen to the crosslinking agent is 1:16.
[0052] The block molecularly imprinted polymer obtained was ground and sieved to obtain particles with a particle size of 60 μm, and the template molecules were removed by Soxhlet extraction using methanol: formic acid (9:1, v / v) and methanol, and the obtained molecularly imprinted polymer was further polyme...
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