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Preparation method of magnetic molecular imprinting photonic crystal sensor for detecting melamine

A magnetic molecular imprinting and melamine technology, which is applied in the direction of material analysis by observing the influence of chemical indicators, and analysis by making materials undergo chemical reactions, can solve the problems of destroying molecular imprinting sites and long template assembly time

Active Publication Date: 2016-07-13
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The published reports on molecularly imprinted photonic crystal sensor technology at home and abroad all use traditional assembly methods such as vertical deposition, evaporation induction, and electrodeposition, which have disadvantages such as long template assembly time and etching process that will destroy molecularly imprinted sites.

Method used

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  • Preparation method of magnetic molecular imprinting photonic crystal sensor for detecting melamine
  • Preparation method of magnetic molecular imprinting photonic crystal sensor for detecting melamine
  • Preparation method of magnetic molecular imprinting photonic crystal sensor for detecting melamine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Preparation of ferroferric oxide magnetic nanoparticles modified with oleic acid: the ferroferric oxide magnetic nanoparticles modified with oleic acid were prepared by co-precipitation method. Add 0.01mol of ferric chloride and 0.01mol of ferrous sulfate into 150mL of ultrapure water that has been treated with nitrogen gas to remove oxygen, and ultrasonically dissolve at 50-60KHz to obtain a mixed solution. The resulting mixed solution was transferred to a 250 mL three-necked flask, and placed in a 60°C oil bath. Add 20 mL of ammonia water and 0.5 g of oleic acid in sequence, pass nitrogen to remove oxygen throughout the reaction, and react for 0.5 h. After the reaction, a magnet was placed at the bottom of the flask to absorb the particles. The collected particles were washed to neutral with deionized water, and dried in a vacuum oven at 40° C. to obtain oleic acid-modified ferroferric oxide magnetic nanoparticles.

[0029] (2) Preparation of melamine magnetic m...

Embodiment 2

[0038] (1) Preparation of ferroferric oxide magnetic nanoparticles modified with oleic acid: the ferroferric oxide magnetic nanoparticles modified with oleic acid were prepared by co-precipitation method. Add 0.01mol of ferric chloride and 0.01mol of ferrous chloride to 120mL of ultrapure water that has been treated with nitrogen gas to remove oxygen, and ultrasonically dissolve at 50-60KHz to obtain a mixed solution. The resulting mixed solution was transferred to a 250 mL three-necked flask, and placed in a 90°C oil bath. Add 30 mL of ammonia water and 1 g of oleic acid in sequence, pass nitrogen to remove oxygen throughout the reaction, and react for 2 hours. After the reaction, a magnet was placed at the bottom of the flask to absorb the particles. The collected particles were washed with deionized water until neutral, and dried in a vacuum oven at 50° C. to obtain oleic acid-modified ferroferric oxide magnetic nanoparticles.

[0039] (2) Preparation of melamine magnetic...

Embodiment 3

[0046] (1) Preparation of ferroferric oxide magnetic nanoparticles modified with oleic acid: the ferroferric oxide magnetic nanoparticles modified with oleic acid were prepared by co-precipitation method. Add 0.01mol of ferric chloride and 0.01mol of ferrous sulfate into 90mL of ultrapure water that has been treated with nitrogen gas to remove oxygen, and ultrasonically dissolve at 50-60KHz to obtain a mixed solution. The resulting mixed solution was transferred to a 250 mL three-necked flask, and placed in an 80°C oil bath. Add 10 mL of ammonia water and 0.1 g of oleic acid in sequence, pass nitrogen to remove oxygen during the whole reaction, and react for 1 h. After the reaction, a magnet was placed at the bottom of the flask to absorb the particles. The collected particles were washed with deionized water until neutral, and dried in a vacuum oven at 45° C. to obtain oleic acid-modified ferroferric oxide magnetic nanoparticles.

[0047] (2) Preparation of melamine magneti...

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Abstract

The invention discloses a preparation method of a magnetic molecular imprinting photonic crystal sensor for detecting melamine and belongs to the technical field of molecular imprinting photonic crystal and analysis detection. The product is obtained through preparation of oleic acid modified ferroferric oxide magnetic nanoparticles, preparation of melamine magnetic molecular imprinting nanoparticles and preparation of the magnetic molecular imprinting photonic crystal sensor. The melamine magnetic molecular imprinting nanoparticles are self-assembled to form a photonic crystal structure under the action of an external magnetic field, and a liquid-state molecular imprinting photonic crystal sensor is obtained. On a macro level, with increase of the concentration of melamine, the diffraction color of the sensor changes from weak purple to green, yellow and finally orange red. The preparation method has the advantages that the photonic crystals are assembled rapidly, simply and conveniently. The provided molecular imprinting photonic crystal sensor transmits a chemical signal of melamine concentration change directly through an optical signal of diffraction color change and realizes the purpose of naked eye detection.

Description

technical field [0001] The invention relates to a preparation method of a magnetic molecular imprinted photonic crystal sensor for detecting melamine, and belongs to the technical field of molecular imprinted photonic crystals and analysis and detection. Background technique [0002] Melamine is an important triazine nitrogen-containing heterocyclic organic compound, which is widely used in wood processing, plastics, coatings and leather industries. Because melamine has a high nitrogen content (66.7%) and is cheap, it is added to feed, milk, milk powder and other foods by some lawless elements to create the illusion of high protein content. Although the toxicity of melamine itself is very low, the hydrolysis of melamine after entering the human body will produce cyanuric acid, and melamine can form insoluble crystalline complexes with cyanuric acid. After the human body ingests melamine, it can lead to cystitis, chronic nephritis, kidney failure, and even urolithiasis and b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F222/14C08F220/56C08F220/06C08F2/26C08F2/44C08F222/20C08F220/14C08K9/04C08K3/22C08J9/26G01N21/78
CPCC08F2/26C08F2/44C08F220/06C08F220/56C08F222/1006C08F222/102C08F222/103C08J9/26C08J2201/0424C08J2333/02C08J2333/26C08J2335/02C08K3/22C08K9/04C08K2003/2275C08K2201/01C08K2201/011G01N21/78C08F220/14
Inventor 曹玉华由爱梅倪鑫炯曹光群
Owner JIANGNAN UNIV
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