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Molecularly-imprinted polymer-graphene composite material modified electrode as well as preparation method and application thereof

A molecular imprinting and composite material technology, applied in the field of food safety monitoring, can solve the problems of easy interference, poor electrode sensitivity and low selectivity in detection, and achieve the effects of improving detection sensitivity, fast response speed and increasing specific surface area.

Inactive Publication Date: 2014-06-18
上海出入境检验检疫局工业品与原材料检测技术中心 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There have been many reports on the use of electrochemically modified electrodes to detect aromatic amines, but the electrodes used in these methods have poor sensitivity, short service life, and low selectivity, and are prone to interference during the detection process.

Method used

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  • Molecularly-imprinted polymer-graphene composite material modified electrode as well as preparation method and application thereof
  • Molecularly-imprinted polymer-graphene composite material modified electrode as well as preparation method and application thereof
  • Molecularly-imprinted polymer-graphene composite material modified electrode as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1 glassy carbon electrode is pretreated

[0029] Grinding and polishing the glassy carbon electrode with 0.5 μm alumina powder, then washing off the alumina powder on the surface with double distilled water, and then successively washing in double distilled water, acetone (analytical pure), HNO 3 Solution (1.0mol / L), NaOH solution (1.0mol / L) and double-distilled water were ultrasonicated for 5 minutes, and finally the electrode was dried at room temperature.

Embodiment 2

[0030] Example 2 Preparation of Molecularly Imprinted Polymer-Graphene Composite Material

[0031] 20 mg of graphene was dispersed in 20 mL of a mixed solution of trichloroethane and acetonitrile (v / v, 1:3), and MDA (0.01 mol / L) was added to ultrasonically disperse for 30 min, followed by 0.04 mol / L 4-VP, 0.2 mol / LEGDMA and 0.01mol / LAIBN were added to the solution, and stirred at 60°C for 24 hours under a nitrogen atmosphere. The product was separated by centrifugation and washed 3 times with methanol. Finally, the composite material was dried in a vacuum oven at 55 °C for 12 h.

[0032] Such as figure 1Shown are the SEM and TEM images of graphene (a, b) and molecularly imprinted polymer-graphene composites (b, d) of the present invention. The molecularly imprinted polymer-graphene composite material prepared in this embodiment is composed of a molecularly imprinted polymer and graphene, wherein the molecularly imprinted polymer is irregularly covered on the surface of the...

Embodiment 3

[0034] Example 3 Preparation of Molecularly Imprinted Polymer-Graphene Composite Modified Electrode

[0035] Add the molecularly imprinted polymer-graphene composite material prepared in Example 2 into the acetic acid solution (containing 0.5% chitosan), and mix uniformly by ultrasonic; take 5 μL of the mixed solution and add it dropwise to the glassy carbon electrode pretreated in Example 1 surface, dry under infrared lamps. The electrode after drying was scanned by linear voltammetry 20 times in phosphate buffer solution (PBS, pH 7.0). As the number of scans increased, the oxidation peak of MDA in the template molecule became smaller and smaller and disappeared gradually. The MDA molecule has been removed from the template, and the molecularly imprinted polymer-graphene composite modified electrode of the present invention is prepared.

[0036] Such as image 3 as shown in image 3 a is the cyclic voltammetry scan diagram of the molecularly imprinted polymer-graphene comp...

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Abstract

The invention discloses a molecularly-imprinted polymer-graphene composite material modified electrode. The molecularly-imprinted polymer-graphene composite material modified electrode comprises a molecularly-imprinted polymer-graphene composite material and a glassy carbon electrode, wherein the glassy carbon electrode is used as a base body; the molecularly-imprinted polymer-graphene composite material is modified on the glassy carbon electrode. The invention further provides a preparation method of the molecularly-imprinted polymer-graphene composite material modified electrode and an application of the molecularly-imprinted polymer-graphene composite material modified electrode to detection of aniline and 4,4'-methylenedianiline (MDA). The molecularly-imprinted polymer-graphene composite material modified electrode has the advantages of high responding speed, good selectivity, high sensitivity and the like and is suitable for rapidly detecting the aniline and the MDA in food safety and environmental sanitation.

Description

technical field [0001] The technology relates to the technical field of food safety monitoring, in particular to a molecularly imprinted polymer-graphene composite modified electrode and its preparation method and application. Background technique [0002] Aromatic amines are a typical class of toxic and harmful substances, and are recognized as suspected carcinogens by the International Agency for Cancer Research. Aromatic amine compounds are widely used in the chemical industry. They are mainly used as intermediates in the synthesis of dyes, cosmetics, drugs and rubber, and are discharged with industrial wastewater, causing environmental pollution to water bodies and soil. Some plastic food packaging materials are also one of the sources of primary aromatic amines. This kind of plastic packaging material is used for food packaging, which can migrate into food and cause pollution, which will bring serious troubles to food safety. Among them, the excessive migration of 4,4...

Claims

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Application Information

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IPC IPC(8): G01N27/30
Inventor 程欲晓顾中怡沈劼金樱华强音周宇艳鲜跃仲陈宁宁顾伟史鑫浩赵凯
Owner 上海出入境检验检疫局工业品与原材料检测技术中心
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