Sensing electrode for detecting chloramphenicol and method for producing molecular imprinting film thereof
A molecularly imprinted membrane and sensing electrode technology, applied in the direction of material impedance, etc., can solve the problems of high preparation cost of molecularly imprinted membrane electrode, difficult to realize a large number of sample detection, complicated electrode processing process, etc., to achieve favorable detection effect and avoid oxidation. Interference of the reduction reaction, avoiding the effect of thermal polymerization
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preparation example Construction
[0040] The preparation method of the conductivity-type sensing electrode molecularly imprinted membrane for detecting chloramphenicol involved in the following examples comprises the following steps:
[0041] Step 1, preparation of chloramphenicol molecularly imprinted membrane: Weigh chloramphenicol template molecules and functional monomers and dissolve them in a solvent, mix them uniformly by ultrasonic vibration, add a cross-linking agent, and then add an adhesive after mixing uniformly by ultrasonic vibration, and then Mix uniformly by ultrasonic vibration, then add the initiator, mix uniformly by ultrasonic vibration, pass nitrogen gas to remove oxygen, add the solution prepared by the above operation dropwise to the reaction area of the working electrode of a screen printing electrode in the conductivity type sensing electrode, cover The glass slide is covered, and then the screen-printed electrode is placed flat in a petri dish, and a mixture of ice and dry ice is pla...
Embodiment 1
[0055] The conductive silver paste is printed on the electrode substrate with the conductive silver paste and the substrate of the terminal, the surface of the electrode connection is coated with a layer of PVC insulator, and the working electrode at the lower end is coated with a layer of conductive graphite by sputtering graphite method. Soak in 50% nitric acid, and then rinse with distilled water for 3 times. Let dry and store at 4°C for later use.
[0056] Weigh 0.05g of chloramphenicol and 70μl of methacrylic acid functional monomer and dissolve in 380μl of tetrahydrofuran solvent, mix ultrasonically for 10 minutes, add ethylene glycol dimethacrylic acid crosslinking agent, mix ultrasonically for 10 minutes, and then add to the reaction system 70 μl of water-based polyurethane adhesive, after ultrasonic mixing for 10 minutes, add 0.02 g of initiator azoisobutylcyanide, after ultrasonic mixing for 20 minutes, nitrogen gas for 5 minutes, then add 10 μl of the prepared mixtu...
Embodiment 2
[0064] In the preparation process of the chloramphenicol molecularly imprinted membrane, the ultraviolet polymerization time was continuous irradiation for 30 minutes, and other conditions remained unchanged. During the detection process, the preparation of the standard curve was the same as in Example 1, and chicken meat was used as the detection sample.
[0065] Sample processing: Take 5 chicken samples confirmed by high performance liquid chromatography-mass spectrometry to not contain chloramphenicol residues, take 1 gram of meat samples, put them into the sample cup of the tissue homogenizer, add 10 ml of 0.1M pH to 7.2 Phosphate buffer solution, crushed and homogenized, transferred to a 15ml centrifuge tube, added 1ml of chloramphenicol standard solution containing 40μg / L, then extracted with 6ml of ethyl acetate, shaken and mixed for 15min, Collect the organic phase containing chloramphenicol, evaporate and remove the organic solvent at 40°C and 240mbar, and finally add...
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