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Preparation method and application of trichlorfon sol-gel imprinted sensor

A trichlorfon and sensor technology, applied in the field of molecular imprinting, to achieve the effect of strong selectivity, low cost and fast response

Active Publication Date: 2021-05-28
HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are no reports on the preparation of sol-gel imprinted sensors using trichlorfon as a template molecule, methyltrimethoxysilane as a functional monomer, and tetramethoxysilane as a crosslinking agent and their application in actual sample detection.

Method used

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  • Preparation method and application of trichlorfon sol-gel imprinted sensor
  • Preparation method and application of trichlorfon sol-gel imprinted sensor
  • Preparation method and application of trichlorfon sol-gel imprinted sensor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064]Example 1 Method for Preparation of Enemy Soliol - Gel Blot Sensor

[0065]In this example, the preparation method of the enemy insect sol - gel blot sensor, the preparation process isfigure 1 As shown in the following step sequence:

[0066](1) Glassy carbon electrode pretreatment

[0067]Use the glass-carbon electrode to use 0.5 ~ 0.05 μm Al2O3The powder is ground on the surface of the suede 77 laps, and after cleaning the electrode surface with ultrapure water, it is placed in 0.5% HNO.3(Mass concentration), absolute ethanol, ultrapure water is less ultrapochampoo 20s; removed and rinsed with ultrapure water, dry nitrogen, then placed the electrode in 0.5 mol / L h2SO4In the solution, cycle scanning is performed in the -0.4 to 1.2 V potential.

[0068]After the electrode is removed, it is placed in an electroactive probe solution, wherein the electroactive probe is a potassium ferric cyanide, an electroactive probe solution is 1 mmol / L K.3[Fe (CN)6] Is prepared with 1 mol / l KCl sol...

Embodiment 2-6

[0081]Example 2-6 Method for Preparation of Enemy Slavol - Gel Blot Sensor

[0082]The present embodiment is a method of preparing an enemyine sol-gel blot sensor, the preparation step and the technical parameters are similar to those of Example 1, and the difference is only the corresponding technical parameters in the preparation process, and the specific results are shown in the table. 1.

[0083]Table 1 Technical parameters of the preparation process

[0084]

[0085]Example 2-6 The sensor is selective, good stability, high sensitivity, low cost, fast response, simple preparation, easy control, compared with other enemy acute detection technology, the operation process is simple, cost Low, time consumption.

Embodiment 7

[0086]Example 7 Restore oxidized graphene modified condition selection experiment

[0087]RGO has a larger electrochemical characteristic such as surface area, excellent conductivity, as an ideal new type of modified material. First, the test is selected to select DMF and ultrapure water as the dispersion medium of RGO, which is fixed to 10 mL, and then accurately weigh 20 mg RgO is dissolved in the dispersion medium, and the ultrasonic 30min is sufficiently dissolved and placed in a 4 ° C environment. 3d The test found that the RGO modifier with ultrapure water as a solvent had a significant settlement phenomenon, and the RGO modifier of DMF as a solvent is well dispersed.

[0088]The RGO modification agent of DMF is applied to the surface of the glass carbon electrode after the cleaning, and it is found that the RGO is uneven and unstable in the surface of the electrode surface, which is the optimum modification, and the test is added to the modified liquid. -1% CH3As the best dispersan...

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Abstract

The invention discloses a preparation method of a trichlorfon sol-gel imprinted sensor, which sequentially comprises the following steps: pretreating a glassy carbon electrode, reducing a graphene oxide modified electrode, preparing a sol-gel pre-polymerization solution, preparing a sol-gel imprinted membrane by electro-polymerization, eluting template molecules and the like. According to the invention, the trichlorfon is used as a template molecule, methyltrimethoxysilane is used as a functional monomer and tetramethoxysilane is used as a cross-linking agent; the imprinted polymer membrane prepared by using a sol-gel method by is high in rigidity and relatively large in specific surface area, so that template molecules and the functional monomer can form a stable host-guest compound; the template molecules can keep a good rigid structure in a polymer net structure and form a cavity with a memory effect, and the prepared sensor is high in selectivity, good in stability, high in sensitivity, low in cost and fast in response. The method is suitable for rapidly detecting the trichlorfon residues in the plant-derived food.

Description

Technical field[0001]The present invention belongs to the field of molecular blotting technology, which relates to a method of preparation of molecular imprint electrochemical sensors and applications thereof, and is specifically a method for preparing an enemyine sol-gel blot sensor and its application.Background technique[0002]The enemy passenger is a pesticide that is more common in domestic production and application of domestic production and applications due to its insecticidality, smaller toxicity, faster degradation. A large number of studies have shown that enemy insects act as a moderate toxic broad-spectrum organophosphorus pesticide, ranking first in acute organophosphorus poisoning incidents in my country's pesticide poisoning incidents. As a neurotoxin, the enemy is a neurotoxin, which is to prevent neurotransidine transmission, causing a series of nervous system poisoning symptoms by inhibiting neurocytes. If you use a large number of enemy insects in a long time, whi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/48G01N27/30C08G77/06
CPCG01N27/48G01N27/308C08G77/06
Inventor 高文惠李东东秦思楠尤晓亭
Owner HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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