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Preparation method of pyrethroid pesticide type molecularly imprinted membrane

A pyrethroid, molecularly imprinted membrane technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc. The effect of permeability, high anti-pollution ability, and great promotion and application prospects

Active Publication Date: 2015-01-28
湖州优研知识产权服务有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional membrane-assisted extraction (MASE) technology uses a non-porous low-density polyethylene membrane (LDPE), and its selectivity mainly depends on the different permeability of the membrane and organic solvent to the target analyte, and cannot effectively extract substances with similar properties. Separated and less resistant to contamination

Method used

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  • Preparation method of pyrethroid pesticide type molecularly imprinted membrane
  • Preparation method of pyrethroid pesticide type molecularly imprinted membrane
  • Preparation method of pyrethroid pesticide type molecularly imprinted membrane

Examples

Experimental program
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Effect test

Embodiment 1

[0024] A method for preparing a pyrethroid pesticide molecularly imprinted membrane, the specific steps are as follows:

[0025] (1) Clean the low-density polyethylene (LDPE) film bag sequentially with absolute ethanol, acetone and distilled water ultrasonically, each time for 8 minutes, and vacuum dry it in a vacuum oven at 45°C for 12 hours; the dried LDPE film bag Placed in the reaction chamber of the plasma processor, after passing through Ar, under the conditions of 25 Pa and 45 W, treat for 30 s to activate the surface of the LDPE film bag, wherein the thickness of the LDPE film bag is 0.02-0.05 mm, and the density is 0.915~0.940 g / cm 3 ;

[0026] (2) Mix the template molecule cypermethrin, the functional monomer methacrylic acid and the crosslinking agent ethylene glycol dimethacrylate at a molar ratio of 1:2:25 to obtain a mixture, and add the mixture to the acetonitrile / acetone mixture (9 : 1, v / v), nitrogen was introduced, and ultrasonic degassed for 14 min to obta...

Embodiment 2

[0031] A method for preparing a pyrethroid pesticide molecularly imprinted membrane, the specific steps are as follows:

[0032] (1) Clean the LDPE film bag sequentially with absolute ethanol, acetone and distilled water ultrasonically, each time for 8 minutes, and dry it in a vacuum oven at 50°C for 8 hours; place the dried LDPE film bag in plasma treatment In the reaction chamber of the instrument, after being fed with Ar, the surface of the LDPE film bag was activated under the conditions of 45 Pa and 30 w for 120 s. The thickness of the LDPE film bag was 0.02-0.05 mm, and the density was 0.915-0.940 g / cm 3 ;

[0033] (2) Mix deltamethrin, acrylic acid AA and ethylene glycol dimethacrylate EGDMA at a molar ratio of 1:8:25 to obtain a mixture, and add the mixture to the acetonitrile / acetone mixture (9:1, After v / v), nitrogen gas was introduced, and ultrasonic degassing was carried out for 16 min to obtain a grafting solution;

[0034](3) Immerse the surface-activated LDP...

Embodiment 3

[0036] A method for preparing a pyrethroid pesticide molecularly imprinted membrane, the specific steps are as follows:

[0037] (1) Clean the LDPE film bag sequentially with absolute ethanol, acetone and distilled water ultrasonically, each time for 10 min, and dry it in a vacuum oven at 48°C for 10 h; place the dried LDPE film bag in plasma treatment In the reaction chamber of the instrument, after He was introduced, the surface of the LDPE film bag was activated under the conditions of 30 Pa and 40 W for 90 s, and the thickness of the LDPE film bag was 0.02-0.05 mm, and the density was 0.915-0.940 g / cm 3 ;

[0038] (2) Mix bifenthrin, acrylamide (AM) and trimethylolpropane trimethacrylate (TRIM) at a molar ratio of 1:4:25 to obtain a mixture, and add the mixture to acetonitrile / acetone to mix After being immersed in the solution (9:1, v / v), nitrogen gas was introduced, and ultrasonic degassing was carried out for 15 min to obtain the grafting solution;

[0039] (3) Imme...

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Abstract

The invention discloses a preparation method of a pyrethroid pesticide type molecularly imprinted membrane. The preparation method is characterized by comprising the following steps: firstly performing ultrasonic washing on an LDPE (low-density polyethylene) membrane with anhydrous ethanol, acetone and distilled water respectively, performing vacuum drying, placing into a reaction chamber of a plasma treatment instrument, introducing argon gas and performing surface activation treatment; then placing the LDPE membrane after activation treatment into a molecular imprinting grafting solution to graft under nitrogen production conditions; taking out the molecularly imprinted membrane after the grafting reaction, and eluting with an organic solvent to remove template molecules till the template molecules can not be detected by GC-ECD (gas chromatography with an electron capture detector); and finally performing vacuum drying on the molecularly imprinted membrane after removal of the template molecules. The preparation method has the advantages that the pyrethroid pesticide type molecularly imprinted membrane has relatively high selective permeability against pyrethroid pesticide residues, can be applied to selective separation and efficient enrichment of pyrethroid pesticides in aquatic products and other complex biological samples, and has relatively high application values.

Description

technical field [0001] The invention relates to a preparation method of a molecularly imprinted membrane, in particular to a preparation method of a pyrethroid pesticide molecularly imprinted membrane. Background technique [0002] Pyrethroid pesticides are a class of high-efficiency, low-toxicity, broad-spectrum pesticides. However, studies have shown that this kind of pesticide has a certain accumulation, is easy to be enriched by organisms, and has carcinogenic, teratogenic, mutagenic and neurotoxic. In recent years, there have been frequent occurrences of pollution and death of breeding organisms. Therefore, the development of pyrethroid pesticide residue analysis technology can provide technical support for the monitoring of pesticide residues and the protection of food foreign trade. [0003] Membrane-assisted extraction (MASE), as an important micro-extraction technology, is a separation technology that utilizes the difference in the permeability of the components i...

Claims

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Application Information

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IPC IPC(8): C08F255/02C08F220/06C08F222/14C08J9/26B01J20/26B01J20/30B01D71/40
Inventor 史西志孙爱丽张蓉蓉李德祥肖婷婷陈炯
Owner 湖州优研知识产权服务有限公司
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