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A composite material modified electrode used for gallic acid concentration determination and applications thereof

A technology for modifying electrodes and composite materials, which is applied in the direction of material electrochemical variables, material analysis, and material analysis through electromagnetic means, which can solve the problems of cumbersome operation, high cost, and narrow linear range of chromatography, and improve the response current signal , enhance the electrode conductivity, reduce the effect of oxidation potential

Inactive Publication Date: 2017-03-22
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, spectrometry is time-consuming and laborious, with poor sensitivity and narrow linear range; chromatography is cumbersome and costly, and requires more complex and expensive instruments and equipment
Electrochemical analysis has attracted much attention due to its advantages of high sensitivity, good selectivity, wide linear range, and easy operation. However, electrochemically modified electrodes based on single materials often cannot exert their optimal catalytic activity in the detection of gallic acid. For example, carbon nanomaterials modified electrodes have the disadvantage of poor stability, so it is necessary to prepare a composite material modified electrode with excellent performance and stability.

Method used

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  • A composite material modified electrode used for gallic acid concentration determination and applications thereof
  • A composite material modified electrode used for gallic acid concentration determination and applications thereof
  • A composite material modified electrode used for gallic acid concentration determination and applications thereof

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Experimental program
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Effect test

Embodiment 1

[0023] Preparation of a polyglutamic acid / copper nanocomposite modified electrode (Cu / PGA / GCE) for the determination of gallic acid comprises the following steps:

[0024] (1) Glassy carbon electrode pretreatment: use α-Al with a particle size of 300nm and 50nm in sequence on the suede 2 o 3 Polish the glassy carbon electrode to the mirror surface with the paste polishing solution, then use absolute ethanol and deionized water to ultrasonically wash the electrode for 1min, and then place the cleaned glassy carbon electrode in 0.5mol / L dilute sulfuric acid solution, in- The 0.5-1.2V potential range was activated by cyclic voltammetry at a scan rate of 100mV / s until the response was stable. Finally, the glassy carbon electrode was rinsed with deionized water and dried for later use.

[0025] (2) Before modifying the glassy carbon electrode, the electrode needs to be at 1mmol / L K 3 [Fe(CN) 6 ] solution (containing 0.1mol / L KCl) to conduct cyclic voltammetry scanning to verify ...

Embodiment 2

[0037] Preparation of a polyglutamic acid / copper nanocomposite modified electrode (Cu / PGA / GCE) for the determination of gallic acid comprises the following steps:

[0038] (1) Glassy carbon electrode pretreatment: use paste polishing solution with a particle size of 300nm and 50nmα-Al2O3 on the suede to polish the glassy carbon electrode to the mirror surface, and then apply absolute ethanol and deionized water to ultrasonically wash the electrode for 90s , and then place the cleaned glassy carbon electrode in 0.6mol / L dilute sulfuric acid solution, perform cyclic voltammetry activation at a sweep rate of 120mV / s in the potential range of -0.6~1.3V, until the response is stable, and finally deionized Rinse the glassy carbon electrode with water and dry it for later use.

[0039] (2) The pretreated glassy carbon electrode was placed in a 0.015 mol / L copper sulfate solution (containing 0.05 mol / L sodium sulfate), and electrodeposition was performed by cyclic voltammetry. In the...

Embodiment 3

[0043] Preparation of a polyglutamic acid / copper nanocomposite modified electrode (Cu / PGA / GCE) for the determination of gallic acid comprises the following steps:

[0044] (1) Glassy carbon electrode pretreatment: use paste polishing solutions with particle sizes of 300nm and 50nmα-Al2O3 on the suede to polish the glassy carbon electrode to the mirror surface, and then apply absolute ethanol and deionized water to ultrasonically wash the electrode for 2min , and then place the cleaned glassy carbon electrode in 0.7mol / L dilute sulfuric acid solution, perform cyclic voltammetry activation at a sweep rate of 140mV / s in the potential range of -0.6~1.5V, until the response is stable, and finally deionized Rinse the glassy carbon electrode with water and dry it for later use.

[0045] (2) The pretreated glassy carbon electrode was placed in a 0.02mol / L copper sulfate solution (containing 0.15mol / L sodium sulfate), and electrodeposition was performed by cyclic voltammetry. Within t...

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Abstract

A composite material modified electrode used for gallic acid concentration determination is disclosed. A metal nanometer modified electrode is firstly prepared through cyclic voltammetry, then a poly(amino acid) film is deposited on the surface of the metal nanometer modified electrode through adopting cyclic voltammetry to prepare a poly(amino acid) / metal nanometer composite material modified electrode, and the prepared composite material modified electrode is used for gallic acid determination. The composite material modified electrode shows excellent electrocatalytic activity for gallic acid, has characteristics of high sensitivity, good accuracy and the like, is convenient and cheap, and has a wide application prospect.

Description

technical field [0001] The invention belongs to the technical field of food analysis and detection, and in particular relates to a composite material modified electrode for gallic acid concentration measurement and its application. Background technique [0002] Gallic acid, also known as "gallic acid" and "gallic acid", is a natural polyphenolic compound widely present in plants such as rhubarb palmatum, Eucalyptus eucalyptus, dogwood, etc. content. Gallic acid not only has a strong antioxidant effect, but also has various biological activities such as anti-inflammation, anti-mutation, anti-virus, and anti-tumor. Therefore, it is of great practical significance to establish a fast, accurate, and highly sensitive method for the determination of gallic acid. . [0003] At present, the detection methods of gallic acid mainly include spectrophotometry, thin layer chromatography, high performance liquid chromatography, capillary electrophoresis and electrochemical analysis. Am...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/327G01N27/30
CPCG01N27/3278G01N27/30
Inventor 韦真博张伟林王俊王永维
Owner ZHEJIANG UNIV
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