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Organotin molecular imprinted electrochemical sensor and preparation method thereof

A molecular imprinting and electrochemical technology, applied in the fields of material electrochemical variables, scientific instruments, instruments, etc., can solve the problems of single detection method of organotin, lack of high-sensitivity rapid detection technology, complexity, etc., to make up for the blank of rapid detection technology, Inexpensive, highly specific effects

Active Publication Date: 2018-07-10
BEIJING PURKINJE GENERAL INSTR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the organotin detection method is single, currently only GC method and ICP method, which require complex derivatization treatment, lack of high-sensitivity rapid detection technology
Electrochemical sensors have rapid detection capabilities, and there is no electrochemical detection method for organotin

Method used

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  • Organotin molecular imprinted electrochemical sensor and preparation method thereof

Examples

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Comparison scheme
Effect test

Embodiment 1

[0044] The present invention electrochemically deposits gold nanoparticles on a screen-printed carbon electrode modified by nano-gold (AuNPs) to obtain a nano-gold modified electrode (AuNPs / SPCE), and then immerses the modified electrode in a certain concentration of o-aminothiophenol-methanol solution for self-assembly , and then self-assembled by immersing in a certain concentration of tricyclic tin methanol solution. Then in the molecularly imprinted polymerization solution formed by dissolving o-aminothiophenol, tricyclotin and tetra-n-butylammonium perchlorate in methanol, molecularly imprinted membranes (MIPs) were in situ polymerized on the surface of AuNPs / SPCE by electrochemical polymerization ; Finally, the template molecule was eluted by electrochemical method to prepare a three-dimensional nano-sensitized organotin molecularly imprinted electrochemical sensor.

[0045] Specifically, the method includes:

[0046] (1) On the screen printing electrode, the gold nanop...

Embodiment 2

[0053] This example provides a method for preparing an organotin molecularly imprinted electrochemical sensor.

[0054] (1) On the screen printing electrode, the gold nanoparticles are modified by electrochemical deposition. The solution used for the electrochemical deposition of gold nanoparticles is 50 μL of chloroauric acid-sulfuric acid solution, the concentration of sulfuric acid is 0.6M, and the concentration of chloroauric acid is 0.1g / L, under the three-electrode system, the control potential was -0.2V ~ -0.3V, electrodeposition was performed for 200s, the electrode was taken out and then rinsed and dried with ultrapure water to obtain the AuNPs / SPCE electrode.

[0055] (2) Immerse the modified electrode AuNPs / SPCE in a 0.6 mM methanol solution of o-aminothiophenol to self-assemble at room temperature for 14 hours, take it out and wash it with ultrapure water to remove non-covalently bonded substances.

[0056] (3) The electrode of the self-assembled functional monome...

Embodiment 3

[0061] This example provides a method for preparing an organotin molecularly imprinted electrochemical sensor.

[0062] (1) On the screen printing electrode, the gold nanoparticles are modified by electrochemical deposition. The solution used for the electrochemical deposition of gold nanoparticles is 50 μL of chloroauric acid-sulfuric acid solution, the concentration of sulfuric acid is 0.5M, and the concentration of chloroauric acid is 0.2g / L, under the three-electrode system, the control potential is -0.2V ~ -0.3V, electrodeposition is 190s, the electrode is taken out and then rinsed and dried with ultrapure water to obtain the AuNPs / SPCE electrode.

[0063] (2) Immerse the modified electrode AuNPs / SPCE in a 0.5 mM methanol solution of o-aminothiophenol to self-assemble at room temperature for 12 hours, take it out and wash it with ultrapure water to remove non-covalently bonded substances.

[0064] (3) The electrode of the self-assembled functional monomer was placed in a...

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Abstract

The invention relates to the technical field of quality and safety of agricultural products, and in particular, relates to an organotin molecular imprinted electrochemical sensor and a preparation method thereof. The method comprises the steps: electrochemically depositing gold nanoparticles on a silk-screen printing electrode to obtain a nano gold modified electrode (AuNPs / SPCE), then immersing the modified electrode in an o-aminothiophenol methanol solution and a tricyclic tin methanol solution with a certain concentration, and self-assembling; then in a molecular imprinted polymerization solution formed by dissolving o-aminothiophenol, tricyclic tin and tetrabutylammonium perchlorate in methanol, polymerizing a molecular imprinted membrane (MIPs) on the surface of the AuNPs / SPCE in situby an electrochemical polymerization method; and finally, eluting to remove template molecules by an electrochemical method to prepare the three-dimensional nano sensitivity-enhanced organotin molecular imprinted electrochemical sensor. The sensor has relatively high sensitivity and relatively large target adsorption capacity, and makes up for the blank of the organotin rapid detection technology.

Description

technical field [0001] The invention relates to the technical field of agricultural product quality and safety, in particular to an organotin molecularly imprinted electrochemical sensor and a preparation method thereof. Background technique [0002] Organotin pesticides are commonly used organometallic pesticides, and are commonly used as acaricides and insecticides. Mainly include triazotin, tricyclic tin, phenbutyltin and triphenyltin hydroxide. Among them, triazotin is easily hydrolyzed into tricyclic tin in the environment, and tricyclic tin is more toxic than triazotin. Studies have shown that tricyclic tin pesticides have teratogenic and carcinogenic effects on animals. Therefore, countries around the world have Strict limits have been established for the maximum residue levels (MRL) of organotin pesticides in agricultural products. In 1987, tricyclic tin was banned in China. Japan’s positive list stipulates that triazoltin and tricyclic tin should not be detected i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/26G01N27/333
CPCG01N27/26G01N27/333
Inventor 佘永新张超洪思慧王静金茂俊郑鹭飞王珊珊金芬邵华
Owner BEIJING PURKINJE GENERAL INSTR