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Preparation method of dicyandiamide molecular imprinting polymer membrane electrode

A molecular imprinting and polymer membrane technology, applied in the analysis of materials, material electrochemical variables, material analysis by electromagnetic means, etc. Selectivity, high sensitivity, overcoming complex effects

Active Publication Date: 2015-05-06
ZHAOQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method needs to be analyzed after sample extraction, purification, and concentration. The process is cumbersome and expensive, and the sample loss is also large. It is especially not suitable for rapid on-site determination and popularization.

Method used

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  • Preparation method of dicyandiamide molecular imprinting polymer membrane electrode
  • Preparation method of dicyandiamide molecular imprinting polymer membrane electrode
  • Preparation method of dicyandiamide molecular imprinting polymer membrane electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Example 1: Treatment of electrodes

[0019] The gold electrodes were polished to a mirror surface on 0.3 μm alumina powder. Sequentially wash with 1mol / L sulfuric acid solution, absolute ethanol, and distilled water for 5 minutes respectively. Then carry out electrochemical polishing treatment, in 0.5mol / L H 2 SO 4 Carry out cyclic voltammetry (CV) scan at -0.3 ~ 1.2V until it reaches a stable value, wash with deionized water and set aside.

Embodiment 2

[0020] Example 2: Preparation of Molecularly Imprinted Sensor Sensitive Membrane

[0021] 1. A three-electrode system is used for electropolymerization, and the gold electrode is used as the working electrode. With dicyandiamide as the template molecule and o-aminophenol as the functional monomer, 0.10mol / L of H 2 SO 4 Dissolve 2.50mmol of o-aminophenol, adjust the pH value to 4.50 with 0.40mol / L NaOH, add 0.5mmol (0.0435g) of dicyandiamide to dissolve, and then dissolve it in 50mL, and use the CV method to scan the scanning voltage in the range of -0.3~1.2V Polymerize 8-30 circles, scan speed is 50mV / s, equilibration time is 10s.

[0022] 2. The polymer film is deposited on the surface of the electrode, and 10 mL of 0.1-1.0 mol / L sulfuric acid solution is used as the eluting solvent for ultrasonic elution for 10 minutes to remove the template molecules from the electrode and make a molecular imprint with holes in the template molecular configuration. Polymer membrane elect...

Embodiment 3

[0027] Embodiment 3: Cyclic voltammetry investigation of different electrodes

[0028] Different electrodes at 5.0mmol / LK 3 [Fe(CN) 6 ] The CV change curve in the solution is as figure 1 Shown (in the figure: a. Bare gold electrode; b. Molecularly imprinted membrane electrode; c. Electrode after elution membrane plate). From figure 1 It can be seen that for molecularly imprinted membrane electrodes, the CV curves tend to be parallel, and almost no redox peaks are observed, indicating that there is a dense imprinted poly-o-aminophenol film on the surface of the electrode, which hinders the ion pairing of the probe between the bottom solution and the surface of the gold electrode. redox reaction; while imprinted "holes" appear after elution, [Fe(CN) 6 ] 3- The ions can diffuse to the surface of the gold electrode to react through the imprinted holes, and the peak current density increases.

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Abstract

The invention relates to a preparation method of a dicyandiamide molecular imprinting polymer membrane electrode. The preparation method comprises the following steps of carrying out electropolymerization by a tri-electrode system, preparing a polymer membrane from dicyandiamide as a template molecule and o-aminophenol as a functional monomer, depositing the polymer membrane on the surface of an electrode, and removing the template molecule on the electrode so that the dicyandiamide molecular imprinting polymer membrane electrode with template molecule-type holes is prepared. The preparation method is a high-selectivity high-sensitivity high-adsorption capacity method for preparing the dicyandiamide molecular imprinting polymer membrane electrode on the surface of a gold electrode from o-aminophenol as a functional monomer by an electropolymerization method. The dicyandiamide molecular imprinting polymer membrane electrode can be used for determination of dicyandiamide content and has good selective identifiability. The dicyandiamide determination electrochemical analytical method utilizing the dicyandiamide molecular imprinting polymer membrane electrode has simple and practical processes and solves the problem that the original method has complexity.

Description

technical field [0001] The invention relates to a molecularly imprinted polymer membrane electrode, in particular to a dicyandiamide molecularly imprinted polymer membrane electrode and a preparation method thereof, which are directly applied to the enrichment and analysis of trace amounts of dicyandiamide in aquatic products and environmental samples. Background technique [0002] Dicyandiamide (DCD) is a dimer of cyanamide, a white crystalline powder, stable when dry. Dicyandiamide has the activity of inhibiting nitrifying bacteria, and is widely used in agricultural production as a nitrification inhibitor to reduce the nitrification rate of soil and reduce nitrogen loss. However, frequent use can cause accumulation of DCD, and dicyandiamide has been detected from infant formula. In addition, dicyandiamide has a high nitrogen content and may be added to milk sources to increase the N content. At present, there is no detection standard for dicyandiamide in milk powder and...

Claims

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Application Information

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IPC IPC(8): G01N27/327G01N27/30
Inventor 汪洪武刘艳清韦寿莲龚思亦
Owner ZHAOQING UNIV
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