Preparation method for cyhalothrin fluorescent surface molecular imprinting sub-micron material
A technology of cyhalothrin and surface molecular imprinting, which is applied in the fields of fluorescence/phosphorescence, material excitation analysis, etc., can solve the problem that there are not many composite fluorescent molecular imprinting materials, and achieve high sensitivity, good monodispersity performance, and strong signal effects
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Embodiment 1
[0033] Preparation of SiO by st?ver method 2 Microspheres. Add 2.0 mL ammonia water to 50 mL ethanol and distilled water mixture (1:1, v / v), sonicate for 15 minutes, and stir magnetically. Measure 2.0 mL of TEOS and slowly drop into the above solution. After the dropwise addition, react at room temperature for 24 hours. Measure 1 mL of MPS and slowly add it dropwise to the resulting milky white dispersion, and continue to stir at room temperature for 24 hours. After the reaction, the SiO was collected by centrifuge 2 The microspheres were dried overnight in a vacuum oven at 40°C. FTIR as figure 2 shown.
Embodiment 2
[0035] The SiO obtained in 200 mg embodiment 1 2 MPS microspheres were ultrasonically dispersed in 70 mL of acetonitrile, and 0.50 mmol of template molecules (cyhalothrin, LC), 2.0 mmol of functional monomers (acrylamide, AM), 0.0328 g of allylfluorescein (AF) and 0.4 mL of crosslinker (divinylbenzene, DVB). Self-assembled at room temperature for 12 hours, after the functional monomers and template molecules fully interacted, 2.5% of the initiator azobisisobutyronitrile (AIBN) based on the total amount of the monomers was added. Air was purged by bubbling nitrogen gas for 15 minutes, and sealed under nitrogen atmosphere. Thermally initiated polymerization was used, and it was placed in a constant temperature oil bath at 60°C for 24 h to react. After the polymerization was completed, a pale yellow precipitated polymer was obtained. Soxhlet extraction and elution with a solution of methanol: acetic acid at 9:1 (V / V) to remove cyhalothrin, and then soak the precipitate repeated...
Embodiment 3
[0037] The SiO obtained in 200 mg embodiment 1 2 MPS microspheres were ultrasonically dispersed in 70 mL of acetonitrile, and 0.75 mmol of template molecules (cyhalothrin, LC), 3.0 mmol of functional monomers (acrylamide, AM), 0.0455 g of allylfluorescein (AF) and 0.6 mL of crosslinker (divinylbenzene, DVB). Self-assembled at room temperature for 12 hours, after the functional monomers and template molecules fully interacted, 2.5% of the initiator azobisisobutyronitrile (AIBN) based on the total amount of the monomers was added. Air was purged by bubbling nitrogen gas for 15 minutes, and sealed under nitrogen atmosphere. Thermally initiated polymerization was used, and it was heated in a constant temperature oil bath at 60 °C for 24 h. After the polymerization was completed, a pale yellow precipitated polymer was obtained. Soxhlet extraction and elution with a solution of methanol: acetic acid at 9:1 (V / V) to remove cyhalothrin, and then soak the precipitate repeatedly with ...
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