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Preparation method of paraquat molecular imprinting sensor

A technology of molecular imprinting and paraquat, applied in the fields of instruments, scientific instruments, analytical materials, etc., can solve the problems affecting the application of molecular imprinting technology, slow electron transfer speed and response, and difficult to control the thickness of the imprinted membrane, and achieve high affinity. and selectivity, high sensitivity, and improved response effects

Inactive Publication Date: 2019-01-04
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the thickness of the imprinted film prepared by the traditional imprinting method is difficult to control, and the high degree of cross-linking makes the electron transfer speed and response slow, and the lower limit of detection is high, which affects the application of molecular imprinting technology in electrochemical sensors.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Preparation of nano-gold / oxidized carbon nanotube modification solution: In the reactor, add deionized water: 88 mL, chloroauric acid: 2.0 g, oxidized carbon nanotube: 4.0 g, ultrasonic at room temperature for 20 minutes, and disperse Evenly, then add citric acid: 6.0g, heat to 55±2°C, stir and react for 40min to obtain nano-gold / carbon nanotube modification solution;

[0023] (2) Preparation of nano-gold / carbon nanotube modified electrode: Polish the glassy carbon electrode with 0.3 μm and 0.01 μm polishing powder in turn, then ultrasonically clean it with twice distilled water, wash with ethanol, and dry it, and then dry it on the glassy carbon electrode. Soak in the nano-gold / oxidized carbon nanotube modification solution for 30 minutes, take it out and place it under an infrared lamp, and evaporate the solvent to get the nano-gold / oxidized carbon nanotube modification solution electrode;

[0024] (3) Preparation of paraquat molecularly imprinted polymer: In the ...

Embodiment 2

[0027] (1) Preparation of nano-gold / oxidized carbon nanotube modification solution: In the reactor, add deionized water: 92 mL, chloroauric acid: 1.0 g, oxidized carbon nanotube: 2.0 g, ultrasonic at room temperature for 20 minutes, and disperse Evenly, then add citric acid: 5.0g, heat to 55±2°C, stir and react for 40min to obtain nano-gold / carbon nanotube modification solution;

[0028] (2) Preparation of nano-gold / carbon nanotube modified electrode: Polish the glassy carbon electrode with 0.3 μm and 0.01 μm polishing powder in turn, then ultrasonically clean it with twice distilled water, wash with ethanol, and dry it, and then dry it on the glassy carbon electrode. Soak in the nano-gold / oxidized carbon nanotube modification solution for 30 minutes, take it out and place it under an infrared lamp, and evaporate the solvent to get the nano-gold / oxidized carbon nanotube modification solution electrode;

[0029] (3) Preparation of paraquat molecularly imprinted polymer: In the ...

Embodiment 3

[0032] (1) Preparation of nano-gold / oxidized carbon nanotube modification solution: In the reactor, add deionized water: 85 mL, chloroauric acid: 1.0 g, oxidized carbon nanotube: 6.0 g, ultrasonic at room temperature for 20 minutes, and disperse Evenly, then add citric acid: 8.0g, heat to 55±2°C, stir and react for 40min to obtain nano-gold / carbon nanotube modification solution;

[0033] (2) Preparation of nano-gold / carbon nanotube modified electrode: Polish the glassy carbon electrode with 0.3 μm and 0.01 μm polishing powder in turn, then ultrasonically clean it with twice distilled water, wash with ethanol, and dry it, and then dry it on the glassy carbon electrode. Soak in the nano-gold / oxidized carbon nanotube modification solution for 30 minutes, take it out and place it under an infrared lamp, and evaporate the solvent to get the nano-gold / oxidized carbon nanotube modification solution electrode;

[0034] (3) Preparation of paraquat molecularly imprinted polymer: In the ...

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PUM

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Abstract

The invention discloses a preparation method of a paraquat molecular imprinting sensor. The preparation method of the paraquat molecular imprinting sensor is characterized in that modifying a glassy carbon electrode by using chloroauric acid and carbon oxide nanotubes to prepare a nanogold / carbon oxide nanotube modifying liquid electrode; second step, adding 72-80% of ethanol, 8-12% of N-allyl-2-aminomethyl-pyrrolidine, 4-8% of acrylamide, 0.2-1.0% of N, N-methylene bisacrylamide, 2-6% of paraquat and 3-5% of ammonium persulfate in a reactor, carrying out stirring reaction at the temperature of 65+ / - 2 DET C to obtain the product, soaking the product for 10 h by using an ethanol and acetic acid mixing solution, and removing template molecules to obtain a paraquat molecular imprinting polymer; and coating the nanogold / carbon oxide nanotube modifying electrode with the polymer in a dripping manner to obtain the paraquat molecular imprinting sensor. The sensor has high sensitivity and selectivity. The paraquat molecular imprinting sensor is high in sensitivity, good in specificity and rapid in detection, and can be used repeatedly.

Description

technical field [0001] The invention relates to a preparation method of a molecular imprinted sensor and the technical field of rapid detection application, in particular to a preparation method of a paraquat molecular imprinted sensor, which is used for detecting paraquat in a sample. Background technique [0002] Paraquat, whose chemical name is 1-1-dimethyl-4-4-bipyridine cationic salt, is a fast-killing herbicide with contact and certain systemic effects. It can be quickly absorbed by the green tissue of plants, causing them to die. Has no effect on non-green organizations. In the soil, it quickly combines with the soil to passivate, and is ineffective for plant roots, perennial rhizomes and perennial roots. It is a quick-acting contact-killing quaternary ammonium salt herbicide. The active ingredients are extremely destructive to the chloroplast membrane, so that photosynthesis and chlorophyll synthesis are quickly suspended, and the leaves begin to be damaged and di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/48G01N27/30
CPCG01N27/308G01N27/48
Inventor 李慧芝翟玉博李志英
Owner UNIV OF JINAN