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Magnetic molecularly imprinted material for identifying chlorophyll, preparation method of material and application

A magnetic molecular imprinting and chlorophyll technology, applied in the fields of materials and analytical chemistry, can solve the problems of reducing the recovery rate of pesticides in planar structure, failing to realize the detection of multiple residues of pesticides, affecting the accurate quantification of pesticide residues, etc. Fast and stable performance

Active Publication Date: 2017-05-10
SHANGHAI ACAD OF AGRI SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the researchers found that its limitation is that the graphitized carbon black (GCB) used in the QuEChERS method not only has a strong adsorption effect on molecules with a planar structure such as chlorophyll, and can remove pigment impurities in the matrix, but also has a planar structure. The pesticide molecule also has a strong adsorption capacity, thus reducing its recovery rate
There is a contradiction between the two. If the amount of GCB is increased, the recovery rate of planar structure pesticides will be significantly reduced while the chlorophyll is removed. If the amount of GCB is reduced and the recovery rate of planar structure pesticides is taken into account, the removal of chlorophyll will be incomplete and high-pigmented agricultural products will appear. The most common severe matrix interference problem in samples, both of which can affect the accurate quantification of pesticide residues
This technology has been widely used in many fields. However, the currently reported molecularly imprinted materials suitable for pesticide detection are usually specific for the detection of a certain pesticide molecule (template molecule) or a compound with a similar structure. When used in the safety detection of agricultural products Unable to realize multi-type pesticide multi-residue detection

Method used

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  • Magnetic molecularly imprinted material for identifying chlorophyll, preparation method of material and application
  • Magnetic molecularly imprinted material for identifying chlorophyll, preparation method of material and application
  • Magnetic molecularly imprinted material for identifying chlorophyll, preparation method of material and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Magnetic Molecularly Imprinted Material Fe 3 o 4 Preparation of @MIP.

[0042] Specifically include the following steps:

[0043] S11: Magnetic ferroferric oxide (Fe 3 o 4 ) Synthesis of nanoparticles

[0044] Weigh 6.763g of ferric chloride hexahydrate and 1.99g of ferrous chloride tetrahydrate, dissolve them in 25mL and 5mL of ultrapure water respectively, mix them and pass through N2 protection. Take 237mL of ultrapure water and 15mL of ammonia water into a 500mL three-neck flask, place in a 35°C water bath, stir fully under the action of a mechanical stirrer, and pass through N 2 , to remove O from the solution 2 , then will contain Fe 3+ and Fe 2+ The mixed solution was added dropwise, the reaction was at 35°C, N 2 Under protection and full mechanical stirring, proceed for 1 hour. After the reaction is completed, the obtained black substance is separated with a super-strong magnet, washed with ultra-pure water, separated with a permanent magnet, and washed...

Embodiment 2

[0050] Magnetic Molecularly Imprinted Material Fe 3 o 4 Preparation of @MIP.

[0051] Specifically include the following steps:

[0052] S21: Magnetic iron tetroxide (Fe 3 o 4 ) Synthesis of nanoparticles

[0053] Weigh 3.38g of ferric chloride hexahydrate and 0.995g of ferrous chloride tetrahydrate, and then dissolve them in 15mL and 3mL of ultrapure water respectively, mix them and pass through N2 protection. Pour 118mL of ultrapure water and 8mL of ammonia water into a 500mL three-necked flask, place it in a water bath at 35°C, fully stir it under the action of a mechanical stirrer, and pour in N 2 , to remove O from the solution 2 , then will contain Fe 3+ and Fe 2+ The mixed solution was added dropwise, the reaction was at 35°C, N 2 Under protection and full mechanical stirring, proceed for 1 hour. After the reaction is completed, the obtained black substance is separated with a super-strong magnet, washed with ultra-pure water, separated with a permanent magnet,...

Embodiment 3

[0059] Magnetic Molecularly Imprinted Material Fe 3 o 4 Preparation of @MIP.

[0060] Specifically include the following steps:

[0061] S31: Magnetic iron tetroxide (Fe 3 o 4 ) Synthesis of nanoparticles

[0062] Weigh 5.07g of ferric chloride hexahydrate and 1.49g of ferrous chloride tetrahydrate, and then dissolve them in 18mL and 4mL of ultrapure water respectively, mix them and inject N 2 Protect. Pour 178mL of ultrapure water and 11mL of ammonia water into a 500mL three-neck flask, place it in a water bath at 35°C, fully stir it under the action of a mechanical stirrer, and inject N 2 , to remove O from the solution 2 , and then the above containing Fe 3+ and Fe 2+ The mixed solution was added dropwise, the reaction was at 35°C, N 2 Under protection and full mechanical stirring, proceed for 1 hour. After the reaction is completed, the obtained black substance is separated with a super-strong magnet, washed with ultra-pure water, separated with a permanent magne...

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Abstract

The invention provides a magnetic molecularly imprinted material for identifying chlorophyll, a preparation method of the material and an application. The preparation method of the magnetic molecularly imprinted material includes the steps: (1) synthesizing magnetic nano-particles Fe3O4; (2) modifying the surfaces of the magnetic nano-particles Fe3O4 by the aid of MAA (methacrylic acid); (3) synthesizing the magnetic molecularly imprinted material Fe3O4@MIP. The magnetic molecularly imprinted material for identifying the chlorophyll can be used for selectively adsorbing the chlorophyll, is high in adsorption capacity and reusing rate, good in selectivity and stability, high in magnetism, rapid in response and applied to pretreatment of pesticide residue detection samples by serving as an adsorbing agent, common interferents such as the chlorophyll in pesticide residue analysis can be removed, various pesticides in high-pigment agricultural product samples such as Chinese chives, spinach and tea leaves are successfully made, and particularly, pesticide residues of a planar structure are detected.

Description

technical field [0001] The invention relates to the technical fields of materials and analytical chemistry, in particular to a magnetic molecular imprinted material for identifying chlorophyll and its preparation method and application. Background technique [0002] The accumulation and residue of pesticides in crops and the environment has always been one of the important sources that threaten human food safety and health. To increase the world's food production, modern agriculture uses chemical fertilizers and pesticides extensively. A wide variety of pesticides are used, including organophosphates (OOPs), organochlorines (OCPs) and pyrethroids. The consequence of the massive use of these pesticides is that these chemicals and their metabolites remain and accumulate in environments such as water and soil, and eventually enter the human body through the food chain. Many studies have proved that some pesticides have carcinogenicity, cytotoxicity, genotoxicity, mutagenicity...

Claims

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Application Information

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IPC IPC(8): B01J20/28B01J20/26B01J20/30B01J20/286B01D15/08G01N21/3577
CPCB01D15/08B01J20/06B01J20/268B01J20/28009B01J20/2808B01J20/286B01J2220/4806B01J2220/4812G01N21/3577
Inventor 陈珊珊邾静静聂冬霞臧洋洋殷玥开振鹏
Owner SHANGHAI ACAD OF AGRI SCI
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