Preparation method of carbaryl molecular imprinting composite membrane

A carnacarb molecular and molecular imprinting technology, which is applied in the field of molecularly imprinted composite membranes, can solve the problems that samples cannot be effectively purified, residual carbaryl cannot be effectively enriched, complicated steps, etc., and achieves low manufacturing and use costs, The effect of high recovery and high selectivity

Inactive Publication Date: 2012-11-28
JIANGSU UNIV
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  • Claims
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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the sample cannot be effectively purified and the residual carbaryl cannot be effectively enriched due to the cumbersome steps of the current sample pretreatment method. apply in

Method used

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  • Preparation method of carbaryl molecular imprinting composite membrane

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Embodiment 1

[0020] 1. Preparation of Carbaryl MIM

[0021] Immerse the PVDF circular filter membrane in 10mg / mL AIBN solution for 5min, take it out and dry it in a vacuum desiccator. Dissolve 0.1mmol of carbaryl in 1.5mL of dichloromethane, add 0.6mmol of 4-VP and 2.5mmol of EGDMA in turn, ultrasonically oscillate for 5min, and then pass nitrogen for 10min; then immerse the PVDF membrane coated with the initiator into the mixture solution, placed under a 365nm ultraviolet lamp and irradiated for 12 hours, and the prepared composite membrane was repeatedly washed with a mixed solvent of methanol-acetic acid with a volume ratio of 9:1 until carbaryl and impurities were not detected in the eluent, and then used Excess acetic acid was washed away with methanol to obtain carbaryl MIM with PVDF as the supporting membrane, which was stored in dichloromethane for future use.

[0022] Selective separation of carbaryl residues in vegetable samples using biscarbaline MIM

[0023] Weigh 20g of blan...

Embodiment 2

[0026] 1. Preparation of Carbaryl MIM

[0027] Immerse the PVDF circular filter membrane in 10mg / mL AIBN solution for 5min, take it out and dry it in a vacuum desiccator. Dissolve 0.1 mmol of carbaryl in 1.5 mL of dichloromethane, add 0.4 mmol of 4-VP and 2.2 mmol of EGDMA in sequence, ultrasonically oscillate for 5 min, and then pass nitrogen gas for 10 min. Then immerse the PVDF membrane coated with the initiator in the mixed solution, and irradiate it under a 365nm ultraviolet lamp for 10 hours. The prepared composite membrane is washed repeatedly with a mixed solvent of methanol-acetic acid with a volume ratio of 9:1 until it reaches the eluent. Until no carbaryl and impurities are detected, the excess acetic acid is washed away with methanol to obtain carbaryl MIM with PVDF as the support membrane, which is stored in dichloromethane for future use.

[0028] Selective separation of carbaryl residues in vegetable samples using biscarbaline MIM

[0029] Weigh 20g of blank ...

Embodiment 3

[0032] 1. Preparation of Carbaryl MIM

[0033] Immerse the PVDF circular filter membrane in 10mg / mL AIBN solution for 5min, take it out and dry it in a vacuum desiccator. Dissolve 0.1 mmol of carbaryl in 1.5 mL of dichloromethane, add 0.8 mmol of 4-VP and 2.4 mmol of EGDMA in turn, ultrasonically oscillate for 5 min, and then pass nitrogen gas for 10 min, then immerse the PVDF membrane coated with the initiator into the mixture solution, placed under a 365nm ultraviolet lamp and irradiated for 11 hours, and the prepared composite film was repeatedly washed with a mixed solvent of methanol-acetic acid with a volume ratio of 9:1 until carbaryl and impurities were not detected in the eluent, and then used Excess acetic acid was washed away with methanol to obtain carbaryl MIM with PVDF as the supporting membrane, which was stored in dichloromethane for future use.

[0034] Selective separation of carbaryl residues in vegetable samples using biscarbaline MIM

[0035] Weigh 20g o...

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Abstract

The invention relates to molecular imprinting composite membranes, in particular a preparation method of a carbaryl molecular imprinting composite membrane. The preparation method comprises the following steps of: using a polyvinylidene fluoride microporous membrane as a supporting membrane; coating an initiator on the membrane; immerging the membrane into a dichlormethane homogeneous system containing template carbaryl, functional monomer 4-vinylpyridine and cross-linking agent ethylene glycol dimethacrylate; initiating polymerization under ultraviolet rays; and then obtaining the carbaryl molecular imprinting composite membrane by an eluting template. With acetonitrile as an eluting agent and acetic acid-methanol as an eluant, the imprinting membrane prepared by the preparation method provided by the invention can be used for achieving solid-phase extraction of residual carbaryl in a vegetable sample solution; and it is shown by adding standard recovery of a blank sample that the membrane obtains very good enriching and separating ability for the residual carbaryl in the sample. According to the invention, the prepared molecular imprinting composite membrane can be reused and has the advantages of low preparation and use cost, simple sample pretreatment step as well as good separating and enriching effect.

Description

technical field [0001] The invention relates to a molecularly imprinted composite membrane, in particular to a preparation method of a carbaryl molecularly imprinted composite membrane. Background technique [0002] In the detection of carbamate pesticide residues, the samples faced have the characteristics of complex components, and the samples need to be pretreated. The ideal goal is to selectively separate the trace substances to be tested from the complex sample matrix. Traditional pretreatment methods include liquid-liquid extraction (LLE) and solid-phase extraction (SPE). SPE has the characteristics of short time consumption, saving reagents, and less harm to operators, so its application is becoming more and more extensive. However, the fillers of traditional SPE columns are usually non-selective adsorption materials, which often cause the loss of the analyte or incomplete removal of the sample matrix in practical applications. Therefore, new sample pretreatment metho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J7/16C08J3/28C08J9/28C08J9/26C08L27/18C08F222/14C08F226/06G01N1/34
Inventor 陈冠华童明珠伊聆晓方柔郭东山武传芹
Owner JIANGSU UNIV
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