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Up-conversion fluorescent molecular imprinted polymer and preparation method thereof

A fluorescent molecular imprinting and molecular imprinting technology, which is applied in chemical instruments and methods, luminescent materials, and other chemical processes, can solve problems such as strong toxicity, biological tissue damage, and background interference, and achieve fast mass transfer and high selectivity. Sexuality and low cost effect

Inactive Publication Date: 2014-12-17
TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, quantum dots (QDs) are a kind of widely used fluorescent semiconducting nanomaterials that can replace traditional organic dyes, but they are highly toxic and excited by high-energy wavelength light, which is easy to cause damage to biological tissues and has a large background interference.

Method used

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  • Up-conversion fluorescent molecular imprinted polymer and preparation method thereof
  • Up-conversion fluorescent molecular imprinted polymer and preparation method thereof
  • Up-conversion fluorescent molecular imprinted polymer and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0027] A method for preparing up-converting fluorescent molecularly imprinted polymers, comprising the following preparation steps:

[0028] (1) First add 0.250g up-conversion fluorescent nanorod β-NaYF 4 :Yb 3+ ,Er 3+ , then add solvent 2.0mL tetrahydrofuran and 2.0mL toluene and 0.165g amecarb template, stir well to dissolve it completely, then add 0.340mL (4.0mmol) methacrylic acid, stir well for 1h; add crosslinking agent ethylene glycol di Reaction of 0.760mL (4.0mmol) of methacrylate and 0.02g of initiator azobisisobutyronitrile for 0.5h; nitrogen gas flow for 10min, thermal polymerization in water bath at 60°C for 20h;

[0029] (2) The polymer in step (1) was pulverized, placed in a Soxhlet extractor, and 270 mL of methanol and 30 mL of glacial acetic acid were added as extraction solvents, and the extraction continued for 48 hours until no memethocarb was detected in the extract. Vacuum-dry at 60°C for 10 hours, and dimethocarb upconverts the fluorescent molecularly...

Embodiment 2

[0031] A method for preparing up-converting fluorescent molecularly imprinted polymers, comprising the following preparation steps:

[0032] (1) First add 0.330g up-conversion fluorescent nanorod β-NaYF 4 :Yb 3+ ,Er 3+ , then add solvent 1.0mL tetrahydrofuran and 2.0mL toluene and 0.165g amethyrcarb template, stir well to dissolve completely, then add 0.255mL methacrylic acid, stir well for 2h; add crosslinking agent ethylene glycol dimethacrylate React 0.570mL with 0.02g initiator azobisisobutyronitrile for 0.3h; blow nitrogen gas for 5min, heat polymerize in a water bath at 55°C for 18h;

[0033] (2) The polymer in step (1) was pulverized, placed in a Soxhlet extractor, and 270 mL of methanol and 30 mL of glacial acetic acid were added as extraction solvents, and the extraction continued for 40 hours until no amecarb was detected in the extract. Vacuum-dry at 50°C for 8 hours, and dimethocarb upconverts the fluorescent molecularly imprinted polymer.

Embodiment 3

[0035] A method for preparing up-converting fluorescent molecularly imprinted polymers, comprising the following preparation steps:

[0036] (1) First add 0.206g up-conversion fluorescent nanorod β-NaYF 4 :Yb 3+ ,Er 3+ , then add solvent 2.0mL tetrahydrofuran and 1.0mL toluene and 0.165g amecarb template, stir well to dissolve completely, then add 0.300mL methacrylic acid, stir well for 1.5h; add crosslinking agent ethylene glycol dimethacrylic acid Reaction of 1.880mL of ester and 0.02g of initiator azobisisobutyronitrile for 0.4h; nitrogen gas flow for 8min, thermal polymerization in water bath at 57℃ for 22h;

[0037] (2) The polymer in step (1) was pulverized, placed in a Soxhlet extractor, and 270 mL of methanol and 30 mL of glacial acetic acid were added as extraction solvents, and the extraction was continued for 42 hours until no amecarb was detected in the extract. Vacuum-dry at 55°C for 9 hours, and dimethocarb upconverts the fluorescent molecularly imprinted poly...

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Abstract

The invention provides an up-conversion fluorescent molecular imprinted polymer and a preparation method thereof, and relates to the field of novel high polymer enrichment materials. Up-conversion fluorescent nano particles NaYF4:Yb<3+> and Er<3+> are used as novel carriers, the novel carriers are combined with a molecular imprinting technology. The invention particularly relates to an up-conversion fluorescent molecular imprinted polymer with good adsorbing and separating functions on carbamate pesticide metolcarb molecules and a preparation method of the up-conversion fluorescent molecular imprinted polymer. The synthesized up-conversion fluorescent molecular imprinted polymer is great in specific surface area, so that the mass transfer rate and the adsorbing capacity are improved greatly in comparison with those of the conventional materials. And moreover, the preparation method is low in cost, simple in synthesis process, and easy in reaction condition control. The prepared up-conversion fluorescent molecular imprinted polymer has the characteristics of high sensitivity and high selectivity on a target product, good reproducibility and good application prospect.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to an up-conversion fluorescent molecularly imprinted polymer and a preparation method thereof. Background technique [0002] As a typical carbamate pesticide, Methiocarb has a large output, a wide variety, and a wide range of dosages. It is easily degraded into corresponding metabolites in organisms and the environment. These metabolites usually have the same or stronger activity as the parent compound. The toxic effect is the inhibition of acetylcholinesterase, and the poisoning symptoms are similar to organophosphorus pesticides. With the continuous increase of its dosage in recent years, its harm to humans and other organisms is becoming more and more serious, and its analysis and detection are also paid more and more attention by people. With the accession of WTO, the problem of dining table and green food has attracted people's attention, and the detection of pestic...

Claims

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Application Information

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IPC IPC(8): B01J20/285C08F2/44C08F222/14B01J20/281C09K11/02C08F220/06C08J9/26C09K11/85
Inventor 王硕钱坤王俊平方国臻
Owner TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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