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Nano gold/graphene modified screen printing electrode, preparation method and application

A screen-printed electrode and graphene technology, applied in the direction of material electrochemical variables, material analysis through electromagnetic means, instruments, etc., can solve the problem of expensive detection time of equipment, incapable of quantitative analysis of catechin content, and inability of EGCG content in tea Measurement and other problems, to achieve the effect of simple preparation method, simple and fast quantitative detection, high sensitivity

Active Publication Date: 2021-06-29
合肥净龙环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the detection methods of catechins in the prior art can only detect the total amount of catechins, and cannot quantitatively analyze the content of single catechins, so it is impossible to measure the EGCG content in tea.
In addition, although traditional high-performance liquid chromatography can accurately distinguish and measure various components, it cannot meet the rapid analysis of EGCG in tea due to the shortcomings of expensive equipment and long detection time.

Method used

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  • Nano gold/graphene modified screen printing electrode, preparation method and application
  • Nano gold/graphene modified screen printing electrode, preparation method and application
  • Nano gold/graphene modified screen printing electrode, preparation method and application

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Embodiment 1

[0036] The preparation method of nano gold / graphene modified screen printing electrode of the present embodiment, wherein, such as figure 1 As shown, the screen-printed electrodes include a working electrode WE1, a reference electrode RE2 and a counter electrode CE3, the working electrode WE and the counter electrode CE are both graphite, and the reference electrode RE is silver. The screen-printed electrode is a planar electrode that integrates the working electrode, reference electrode, and counter electrode on the same centimeter level, which can greatly reduce the size and cost of the sensor. Compared with traditional electrodes, screen-printed electrodes are easy to manufacture and low in price, making them potentially commercialized and mass-produced; at the same time, nanomaterials are modified to improve the sensitivity and detection range of electrodes.

[0037] Specifically, the preparation method of the nano-gold / graphene modified screen-printed electrode of the pre...

Embodiment 2

[0051] The nano-gold / graphene modified screen-printed electrode prepared in Example 1 was applied to the content determination of catechin. Specifically, the content determination of catechin comprises the following steps:

[0052] (a1) Connect the nano-gold / graphene modified screen-printed electrode to the electrochemical workstation through the electrode converter, and insert the nano-gold / graphene-modified screen-printed electrode into a buffer solution containing phosphate (0.1mol / L, pH=2 ) in the electrolytic cell, use cyclic voltammetry to scan within the set scanning voltage range of 0 to 1.2V until it is stable;

[0053] (a2) adding standard solutions of components to be measured in various concentrations of catechins to the electrolytic cell, and using differential pulse voltammetry to measure and record the peak current of the characteristic peaks corresponding to the components to be measured;

[0054] (a3) Obtain a standard curve of the concentration of the compon...

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Abstract

The invention belongs to the technical field of food safety detection, and specifically relates to a nano-gold / graphene modified screen printing electrode, a preparation method and an application. Wherein, the preparation method comprises the following steps: Step 1, preparing a graphene solution; Step 2, adding a gold precursor solution into the graphene solution to obtain a mixed solution; Step 3, coating the mixed solution on the screen printing electrode In the working electrode area, after drying to form a film, a screen-printed electrode with a film layer is obtained; step 4, connect the screen-printed electrode with a film layer to an electrochemical workstation, and perform cyclic voltammetry scanning in the electrolyte to obtain a nanometer Gold / graphene modified screen-printed electrodes. In the preparation method of the present invention, the screen printing electrode is used as a substrate, and the mixed solution of the precursor of graphene and gold is coated on the working electrode area of ​​the screen printing electrode, and after drying and forming a film, scanning by cyclic voltammetry is performed. The nano-gold / graphene modified screen-printed electrode is obtained, and the preparation method is simple and reliable.

Description

technical field [0001] The invention belongs to the technical field of food safety detection, and in particular relates to a nano-gold / graphene modified screen printing electrode, a preparation method and an application. Background technique [0002] Tea is one of the most popular beverages in the world, and its main nutrients are catechins, known as important natural phenolic antioxidants. Phenolic antioxidants play a role in anti-aging of cells by blocking the reaction of free radicals. At the same time, catechins play an important role in the fields of anti-tumor, anti-ultraviolet damage, anti-hypertension, and protection of liver cells. Catechin is a general term for a variety of polyphenols, mainly including epicatechin (EC), epigallocatechin (EGC), epigallocatechin gallate (EGCG) , Epicatechin gallate (epicatechin gallate, ECG). Among them, EGCG, as the component with the highest content and the best antioxidant activity among catechins, has broad research prospects...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/30
CPCG01N27/308
Inventor 樊凯李杜娟徐枫王高峰王路文陈世昌严军荣
Owner 合肥净龙环保科技有限公司
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