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Preparation method of glyphosate molecularly-imprinted electrochemical sensor

A technology of molecular imprinting and molecular imprinting membrane, which is applied in the field of molecular imprinting and electrochemical polymerization, can solve the problems of water pollution, detection difficulties, and inability to detect on-site, and achieve the effect of strong specificity, high sensitivity, and low price

Active Publication Date: 2016-12-14
内蒙古普析通用仪器有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the toxicity of glyphosate is low, the U.S. Environmental Protection Agency (EPA) lists glyphosate as a third-class toxic substance (low toxicity). Cases continue to increase, so countries around the world have established strict limits on the maximum residue level (MRL) of glyphosate in agricultural products
Glyphosate and its main degradation product, Aminomethyl phosphonic acid (AMPA), are easily soluble in water, difficult to dissolve in general organic solvents, difficult to volatilize, and lack color and fluorescent groups. It is difficult to detect it, and it cannot be detected on site, and the sample pretreatment process is cumbersome

Method used

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  • Preparation method of glyphosate molecularly-imprinted electrochemical sensor

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Embodiment 1

[0048] The preparation method of glyphosate molecularly imprinted electrochemical sensor comprises the following steps:

[0049] 1) Glassy carbon electrode treatment: use 0.3μm and 0.05μm Al on the glassy carbon electrode in turn 2 o 3 The powder was polished on suede, rinsed with ultrapure water, and then ultrasonically washed in ethanol and ultrapure water for 3 min. Then place the electrode in potassium ferricyanide for cyclic voltammetry scanning. If no quasi-reversible cyclic voltammetry peak (peak current ratio is 1:1, and peak potential difference is less than 90mV), the electrode should be reprocessed.

[0050] 2) Graphene-modified electrode: first, apply the graphene dispersion onto the surface of the glassy carbon electrode, and let it dry at room temperature; then take 5 μL BPPF 6 The ionic liquid was drip-coated on the surface of the electrode again, and dried in a 60°C drying oven to obtain a graphene-modified electrode for use.

[0051] The composition of desc...

Embodiment 2

[0055] The preparation method of glyphosate molecularly imprinted electrochemical sensor comprises the following steps:

[0056] 1) Glassy carbon electrode treatment: use 0.3μm and 0.05μm Al on the glassy carbon electrode in turn 2 o 3 The powder was polished on suede, rinsed with ultrapure water, and then ultrasonically washed in ethanol and ultrapure water for 3 min. Then place the electrode in potassium ferricyanide for cyclic voltammetry scanning. If no quasi-reversible cyclic voltammetry peak (peak current ratio is 1:1, and peak potential difference is less than 90mV), the electrode should be reprocessed.

[0057] 2) Graphene-modified electrode: first, apply the graphene dispersion onto the surface of the glassy carbon electrode, and let it dry at room temperature; then take 5 μL BPPF 6 The ionic liquid was drip-coated on the surface of the electrode again, and dried in a 60°C drying oven to obtain a graphene-modified electrode for use.

[0058] The composition of desc...

Embodiment 3

[0062] The preparation method of glyphosate molecularly imprinted electrochemical sensor comprises the following steps:

[0063] 1) Glassy carbon electrode treatment: use 0.3μm and 0.05μm Al on the glassy carbon electrode in turn 2 o 3 The powder was polished on suede, rinsed with ultrapure water, and then ultrasonically washed in ethanol and ultrapure water for 3 min. Then place the electrode in potassium ferricyanide for cyclic voltammetry scanning. If no quasi-reversible cyclic voltammetry peak (peak current ratio is 1:1, and peak potential difference is less than 90mV), the electrode should be reprocessed.

[0064] 2) Graphene-modified electrode: first, apply the graphene dispersion onto the surface of the glassy carbon electrode, and let it dry at room temperature; then take 5 μL BPPF 6 The ionic liquid was drip-coated on the surface of the electrode again, and dried in a 60°C drying oven to obtain a graphene-modified electrode for use.

[0065] The composition of desc...

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Abstract

The invention relates to the technical field of molecularly-imprinted and electrochemical polymerization, in particular to a preparation method of a glyphosate molecularly-imprinted electrochemical sensor. The preparation method comprises the following steps that 1, gold nanoparticles are electrochemically deposited on a graphene-modified electrode to obtain a graphene-nanogold-modified electrode; 2, a molecularly-imprinted polymer is polymerized on the surface of the graphene-nanogold-modified electrode in situ through an electrochemical polymerization method to form a layer of a molecularly-imprinted film, wherein the molecularly-imprinted polymer takes pyrrole as a functional monomer and takes glyphosate as a template molecule; 3, the glyphosate template molecule is removed, and then the glyphosate molecularly-imprinted electrochemical sensor is prepared.

Description

technical field [0001] The invention relates to the technical field of molecular imprinting and electrochemical polymerization, in particular to a preparation method of a glyphosate molecular imprinting electrochemical sensor. Background technique [0002] It is one of the most widely used herbicides in the world at present. It was developed by Monsanto Company of the United States and has been used for nearly forty years. Glyphosate (Glyphosate Gly) is its main active ingredient, and its chemical name is N-(phosphonic acid methyl) glycine, which belongs to the carboxyl group-containing compound of aminomethylene phosphonic acid. Glyphosate has stable physical and chemical properties, has the advantages of systemic conductivity, high efficiency, low toxicity, and low residue. At the same time, because genetically modified crops can tolerate glyphosate, glyphosate is very popular as a supporting product for genetically modified crops. Since its successful development in 19...

Claims

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Application Information

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IPC IPC(8): G01N27/30G01N27/48
CPCG01N27/308G01N27/48
Inventor 佘永新王静李腾飞张超赵风年洪思慧金茂俊王珊珊金芬邵华郑鹭飞
Owner 内蒙古普析通用仪器有限责任公司
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