Preparation method of multi-wall carbon nanotube/poly L-histidine modified glass carbon electrode and application thereof in determining hydroquinone

A technology of multi-walled carbon nanotubes and glassy carbon electrodes, which is applied in the preparation of multi-walled carbon nanotubes/poly-L-histidine modified glassy carbon electrodes, and the application fields in the determination of hydroquinone, can solve the electrochemical response poor and other problems, to achieve good biocompatibility, good mechanical strength, and a wide range of applications

Inactive Publication Date: 2017-08-29
XINYANG NORMAL UNIVERSITY
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Problems solved by technology

At present, the methods reported in the literature for the determination of HQ mainly include spectrophotometry, high performance liquid chromatography, thin layer chromatography, capillary electrophoresis, synchronous fluorescence method, electrochemical method, etc., and electrochemical method has advantages compared with other several methods. Obvious advantages, such as simple operation, low cost required, high sensitivity and good stability, etc., but currently the electrochemical response of hydroquinone (HQ) on bare electrodes is poor

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  • Preparation method of multi-wall carbon nanotube/poly L-histidine modified glass carbon electrode and application thereof in determining hydroquinone
  • Preparation method of multi-wall carbon nanotube/poly L-histidine modified glass carbon electrode and application thereof in determining hydroquinone
  • Preparation method of multi-wall carbon nanotube/poly L-histidine modified glass carbon electrode and application thereof in determining hydroquinone

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Embodiment 1

[0016] The preparation method of the multi-walled carbon nanotube / poly-L-histidine modified glassy carbon electrode comprises the following steps: ① Firstly, the glassy carbon electrode with an effective diameter of 3 mm) is polished on sandpaper, and then the oxide layer with 0.3 μm and 0.05 μm is successively poured Polish the aluminum suede to a mirror surface, then rinse the electrode surface with deionized water, then perform ultrasonic cleaning for 2 to 3 minutes, and dry it for later use; -3 In the PBS buffer solution of mol / L L-histidine pH=7.0, within the potential range of -1.2-2.0V, perform electrochemical scanning polymerization at a scan rate of 50mV / s for 15 cycles (30 segments), take it out and dry it in the air , to prepare poly-L-histidine-modified glassy carbon electrode (poly-L-HiS / GCE); ③ first add multi-walled carbon nanotubes into distilled water, and ultrasonicate for 2 hours to make 1 mg / mL black suspension of MWCNTs (stock solution ), then use a micros...

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Abstract

A multi-wall carbon nanotube/poly L-histidine compound membrane electrode (MWCNTs/poly-L-HiS/GCE) is prepared by polymerizing L-histidine to a glass carbon electrode and then dropping a multi-walled carbon nanotube suspension liquid to poly-L-HiS/CGE. In a PBS buffer solution, the pH of which is 7.0, an electrochemical behavior of hydroquinone (HQ) on a modified electrode is researched by virtue of cyclic voltammetry, and the property thereof is represented by means of electrochemical impedance spectroscopy (EIS), influence on hydroquinone determination by sweep rate, pH and etc. are discussed, the experimental condition is optimized, and finally, the HQ solutions with different concentrations are determined by means of differential pulse voltammetry (DPV). Experimental results verify that the response current on a composite electrode of HQ is obviously enhanced, and a good linear relationship with an oxidation peak current (Ipa) in a concentration range of 5.0*10<-8>-8*10<-4>mol/L is shown. The coefficient of association is 0.998, and when the signal to noise ratio is 3, the detection limit is 1.0*10<-8>mol/L.

Description

technical field [0001] The invention belongs to the technical field of chemically modified electrodes, and in particular relates to a preparation method of a multi-walled carbon nanotube / poly-L-histidine modified glassy carbon electrode and its application in measuring hydroquinone. Background technique [0002] Hydroquinone (HQ), also known as hydroquinone, is a white needle crystal that changes color when exposed to light. It is easily soluble in hot water, soluble in cold water, ethanol and ether, and slightly soluble in benzene. It is an important phenolic compound. , is also a widely used chemical raw material, and is widely used in photographic developer, synthetic dye, polymerization inhibitor, inhibitor, rubber anti-aging agent and food antioxidant in daily production and life. However, because HQ is highly toxic and difficult to degrade, it can induce apoptosis of hematopoietic stem cells and immune cells in the body, and has certain toxicity to the body and the env...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/30
CPCG01N27/308
Inventor 段香芝马建民许春萱宋力宋梦梦
Owner XINYANG NORMAL UNIVERSITY
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