Preparation method of visible sulfanilamide molecular engram detection membrane
A technology of molecular imprinting and sulfonamide, applied in chemical instruments and methods, other chemical processes, color/spectral characteristics measurement, etc., can solve the problems of cumbersome detection process and high cost, and achieve good optical characteristics, easy recycling, and easy operation Effect
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[0036] Example 1:
[0037] (1) Prepare nanocrystalline cellulose (NCC), adjust the pH of NCC to 2.4 and the concentration of 3.8 wt% through the process of centrifugation and dialysis.
[0038] (2) Synthesize a sulfonamide resin imprinting precursor polymer, dissolve it with a mixed solvent of ethanol and water (15 / 85v / v%) and prepare it into a 40wt% mixed solution for use.
[0039] (3) After ultrasonically degassing the NCC suspension in step (1) for 20 minutes, draw 10 mL of NCC into a 25 mL round bottom flask, and add 300 μL of the resin imprinting precursor polymer solution in step (2) dropwise. The reaction was stirred at room temperature for 4h. Place it in a constant temperature water bath at 22°C to dry to form a film, that is, a sulfonamide molecularly imprinted composite film.
[0040] (4) Place the membrane material in a 16% sodium hydroxide elution solution, and elute in a constant temperature water bath at 70°C for 7-12 hours. After taking it out, rinse and soak it with...
Example Embodiment
[0046] Example 2:
[0047] (1) Prepare nanocrystalline cellulose (NCC), adjust the pH of NCC to 2.4 and the concentration of 3.8 wt% through the process of centrifugation and dialysis.
[0048] (2) Synthesize a sulfonamide resin imprinting precursor polymer, dissolve it with a mixed solvent of ethanol and water (15 / 85v / v%) and prepare it into a 40wt% mixed solution for use.
[0049] (3) After ultrasonically degassing the NCC suspension in step (1) for 20 minutes, draw 10 mL of NCC into a 25 mL round bottom flask, and add 400 μL of the resin imprinting precursor polymer solution in step (2) dropwise. The reaction was stirred at room temperature for 4h. Place it in a constant temperature water bath at 22°C to dry to form a film, that is, a sulfonamide molecularly imprinted composite film.
[0050] (4) The (3) membrane is placed in a 16% sodium hydroxide elution solution, and eluted in a constant temperature water bath at 70°C for 7-12 hours. After taking it out, first rinse and soak w...
Example Embodiment
[0053] Example 3:
[0054] (1) Prepare nanocrystalline cellulose (NCC), adjust the pH of NCC to 2.4 and the concentration of 3.8 wt% through the process of centrifugation and dialysis.
[0055] (2) Synthesize a sulfonamide resin imprinting precursor polymer, dissolve it with a mixed solvent of ethanol and water (15 / 85v / v%) and prepare it into a 40wt% mixed solution for use.
[0056] (3) After ultrasonically degassing the NCC suspension in step (1) for 20 minutes, draw 10 mL into a 25 mL round bottom flask, and add 500 μL of the resin imprinting precursor polymer solution in step (2) dropwise, at room temperature The reaction was stirred for 4h. Place it in a constant temperature water bath at 22°C to dry to form a film, that is, a sulfonamide molecularly imprinted composite film.
[0057] (4) Place the membrane material in a 16% sodium hydroxide elution solution, and elute in a constant temperature water bath at 70°C for 7-12 hours. After taking it out, rinse and soak it with a larg...
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