Method for preparation of triazole molecularly imprinted electrochemical sensor based on electropolymerized OPD/OAP composite membrane and application thereof

A technology of molecular imprinting and triazoles, which is applied in the direction of material electrochemical variables, can solve the problems affecting the stability and selectivity of polymeric membranes, the number of polar functional groups, and the damage to the endocrine system, etc., and achieves low cost and time-consuming Short, selective effect

Active Publication Date: 2015-07-08
HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Triazole pesticides are a kind of broad-spectrum systemic fungicides, which can be used to prevent and control plant diseases caused by sclerotinia, sclerotinia, etc., and are widely used in the planting process of grain crops such as wheat and agricultural products such as fruits and vegetables However, due to the abuse and unreasonable use of pesticides, the pesticide residues in related agricultural products will inevitably exceed the standard, and then after people or livestock and poultry eat processed or unprocessed related foods in the later stage, it will cause harm to human and animal bodies. The endocrine system causes great harm
At present, people mostly use a single functional monomer for electropolymerization, because the functional monomer has limitations such as the small number and types of polar functional groups contained in the molecular structure, which affects the stability and selectivity of the polymerized membrane.

Method used

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  • Method for preparation of triazole molecularly imprinted electrochemical sensor based on electropolymerized OPD/OAP composite membrane and application thereof
  • Method for preparation of triazole molecularly imprinted electrochemical sensor based on electropolymerized OPD/OAP composite membrane and application thereof
  • Method for preparation of triazole molecularly imprinted electrochemical sensor based on electropolymerized OPD/OAP composite membrane and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Example 1 A preparation method of myclobutanil molecularly imprinted electrochemical sensor

[0047] This embodiment is carried out successively according to the following steps:

[0048] (11) Glassy carbon electrode pretreatment

[0049] The carbon electrodes were sequentially made of Al 2 o 3 Powder polishing (the polishing in this embodiment is carried out on the suede of the polishing machine. According to the actual situation, this polishing step can also be carried out on other polishing cloths of the conventional polishing machine used for electrode polishing), rinse with ultrapure water After ultrasonic washing in absolute ethanol and ultrapure water, the electrode was placed in 0.5mol / L H 2 SO 4 In solution, cycle scan;

[0050] After taking out the electrode and washing it, place it in the electroactive probe solution, wherein the electroactive probe is potassium ferricyanide, and the electroactive probe solution is 2mmol / L potassium ferricyanide and 1m...

Embodiment 2-6

[0059] Example 2-6 Preparation method of myclobutanil molecularly imprinted electrochemical sensor

[0060] This example is a preparation method of myclobutanil molecularly imprinted electrochemical sensor, the preparation steps are the same as in Example 1, the only difference is that the corresponding technical parameters in the preparation process are different, and the specific results are shown in Table 1.

[0061] Table 1 Technical parameter list of the preparation process

[0062]

[0063] The potential intervals of the cyclic scanning in step (x1) (x=2-6) and step (x2) (x=2-6) in the above-mentioned embodiment 2-6 are both -0.5-1.5V.

[0064] The myclobutanazole molecularly imprinted electrochemical sensor prepared in Examples 2-6 has strong selectivity, good stability, high sensitivity, low cost, fast response, simple preparation steps and easy control, and is comparable to other myclobutanazole detection technologies. Compared, the operation process is simple, ...

Embodiment 7

[0065] Example 7 Electropolymerization OPD / OAP Composite Film Thickness Research

[0066] In this example, the thickness of the OPD / OAP composite film prepared in Example 1 is studied, and the thickness of the composite film generated is calculated by the electricity calculation method.

[0067] According to the total electricity generated during the preparation of the myclobutanil molecularly imprinted electrochemical sensor, the thickness of the film was calculated using the electricity calculation method, and the total electricity generated during the polymerization process was 9.3×10 -4 C, the specific calculation formula is as follows:

[0068] d=mQ / (FAρ)

[0069] Where: d-film thickness, nm

[0070] m - the mass of the functional monomer, g;

[0071] Q-the total electricity generated during the polymerization process, C;

[0072] F-Faraday's constant, C / moL;

[0073] A-electrode surface area, cm 2 ;

[0074] Density of ρ-poly OPD / OAP composite film, g / cm 3 , ...

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Abstract

The invention discloses a method for preparation of triazole molecularly imprinted electrochemical sensor based on an electropolymerized OPD/OAP composite membrane. The method includes glassy carbon electrode pretreatment, electropolymerization of OPD/OAP composite membrane, template molecule elution and other steps in order. According to the invention, a triazole substance is taken as the template molecule, OPD and OAP are adopted as the mixed functional monomer, the use of the composite functional monomer improves the selection performance of the binding site in a polymer film, and is conducive to forming a stable host-guest compound from a template molecule and a functional monomer, so that the template molecule can maintain a good rigid structure in a polymer network structure and form a cavity with memory effect. The preparation method is simple and easy to control, and the sensor has the advantages of strong selectivity, good stability, high sensitivity, low cost, and fast response. The invention also provides application of the sensor in adsorption of triazole substances. The sensor prepared by the method provided by the invention is suitable for analysis and detection of residual triazole pesticide in vegetables, fruits and other agricultural products.

Description

technical field [0001] The invention belongs to the fields of molecular imprinting technology, supramolecular chemistry and electrochemical analysis, and relates to a preparation method and application of a molecular imprinting electrochemical sensor, in particular to a method for preparing triazole molecules based on an electropolymerized OPD / OAP composite film Methods of printing electrochemical sensors and their applications. Background technique [0002] Triazole pesticides are a kind of broad-spectrum systemic fungicides, which can be used to prevent and control plant diseases caused by sclerotinia, sclerotinia, etc., and are widely used in the planting process of grain crops such as wheat and agricultural products such as fruits and vegetables However, due to the abuse and unreasonable use of pesticides, the pesticide residues in related agricultural products will inevitably exceed the standard, and then after people or livestock and poultry eat processed or unprocesse...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/26
Inventor 高文惠庞军
Owner HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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