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Preparation method of molecular imprinting-fluorescent quantum dot dual-functional composite microsphere and application thereof in carbamates pesticide residue analysis

A technology of carbamate and fluorescent quantum dots, which is applied in the direction of fluorescence/phosphorescence, material excitation analysis, luminescent materials, etc., can solve the problems of high hazards to operators, consumption of organic solvents, cumbersome processing steps, etc., to reduce analysis costs, Wide applicability and improved analysis speed

Inactive Publication Date: 2014-04-16
NORTHEAST FORESTRY UNIVERSITY
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Problems solved by technology

[0006] The purpose of the present invention is to solve the problems of cumbersome pretreatment steps, large consumption of organic solvents, long analysis time, high cost and great harm to operators in the existing analysis of carbamate pesticide residues, and provide a molecular imprinting-fluorescent Preparation of quantum dot bifunctional composite microspheres and its application in the analysis of carbamate pesticide residues

Method used

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  • Preparation method of molecular imprinting-fluorescent quantum dot dual-functional composite microsphere and application thereof in carbamates pesticide residue analysis
  • Preparation method of molecular imprinting-fluorescent quantum dot dual-functional composite microsphere and application thereof in carbamates pesticide residue analysis
  • Preparation method of molecular imprinting-fluorescent quantum dot dual-functional composite microsphere and application thereof in carbamates pesticide residue analysis

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specific Embodiment approach 1

[0040] Specific implementation mode 1: This implementation mode is a method for preparing molecularly imprinted-fluorescent quantum dot bifunctional composite microspheres, which is specifically completed according to the following steps:

[0041]1. Synthesis of doped quantum dots ZnS:Mn: ① First, add manganese chloride, zinc sulfate and distilled water into the container, and react for 10min to 30min under nitrogen atmosphere and stirring speed of 300r / min to 400r / min , and then drop the sodium sulfide aqueous solution with a concentration of 2mmol / mL to 3mmol / mL into the container at a dropping speed of 30 drops / min to 50 drops / min, in a nitrogen atmosphere and a stirring speed of 300r / min to 400r React for 20-40 minutes under the condition of oleic acid, then add oleic acid, stir evenly to obtain a white emulsion; ②Use ethanol as solvent, wash the white emulsion centrifugally for 2-5 times to obtain oleic acid-modified doped Type quantum dots ZnS:Mn;

[0042] The mol ratio...

specific Embodiment approach 2

[0062] Specific embodiment two: the difference between this embodiment and specific embodiment one is: in step one (1) at first manganese chloride, zinc sulfate and distilled water are added in the container, under nitrogen atmosphere and stirring speed is 350r / min~400r / The reaction time is 15min to 25min under the condition of 1 min, and then the sodium sulfide aqueous solution with the concentration of 2.5mmol / mL to 3mmol / mL is added dropwise to the container at a rate of 35 drops / min to 45 drops / min. React with a stirring speed of 350r / min to 400r / min for 25min to 40min, then add oleic acid, and stir evenly to obtain a white emulsion. Other steps are the same as in the first embodiment.

specific Embodiment approach 3

[0063] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the molar ratio of manganese chloride and zinc sulfate in Step 1. is 1:(12.5-13). Other steps are the same as those in Embodiment 1 or 2.

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Abstract

The invention discloses a preparation method of a molecular imprinting-fluorescent quantum dot dual-functional composite microsphere and application thereof in carbamates pesticide residue analysis, and relates to a preparation method and an application method of dual-functional composite microsphere, aiming at solving the problems of the existing carbamates pesticide residue analysis which is complex in pretreatment step, high in organic solvent consumption, long in analysis time, high in cost and serious in hazard to operator. The preparation method comprises the steps of I. synthesizing a doping type quantum dot ZnS: Mn; and II. preparing the molecular imprinting-fluorescent quantum dot dual-functional composite microsphere; the application method of the molecular imprinting-fluorescent quantum dot dual-functional composite microsphere in carbamates pesticide residue analysis comprises the steps of I. mixing; and II. detecting. The preparation method and application disclosed by the invention have the advantages that adding standard recovery rate of determination is 94-99%, and analysis cost is reduced by 50-70%; the method is applicable to preparation and application methods of the molecular imprinting-fluorescent quantum dot dual-functional composite microsphere.

Description

technical field [0001] The invention relates to a preparation method and an application method of a bifunctional composite microsphere. Background technique [0002] Quantum dots (Quantum Dots, QDs), also known as semiconductor nanocrystals, refer to metal semiconductor particles with a particle radius between 1 and 100nm. Composition of group V elements. Because of its small size, this material exhibits some distinctive properties, such as quantum size effects, surface and interface effects, and macroscopic quantum tunneling effects. Single-nuclear types such as CdTe, ZnS, etc., have relatively low quantum yields and unstable properties; core-shell types such as CdSe / ZnS, CdS / HgS, etc., reduce surface defects and improve fluorescence intensity and stability; doped types such as CdSe:Mn, ZnS:Mn, etc. not only significantly improve the optical properties of semiconductor quantum dots, but also increase the magnetic and electrical properties. Quantum dots can produce fluore...

Claims

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Application Information

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IPC IPC(8): C08F292/00C08F220/06C08F226/06C08F220/56C08F212/14C08F220/20C08J9/26C09K11/56C09K11/02G01N21/64
Inventor 陈立钢任晓慧孙明礼
Owner NORTHEAST FORESTRY UNIVERSITY
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