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Electrochemical sensor used for bisphenol A detection

An electrochemical and sensor technology, applied in the field of electrochemical sensors for bisphenol A detection, to achieve the effects of good reproducibility, easy operation and high sensitivity

Inactive Publication Date: 2012-02-01
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In order to overcome the deficiency of a single carbon nanotube or β-cyclodextrin on the modified electrode, the present invention grafts β-cyclodextrin onto the surface of carbon nanotubes to obtain a carbon nanotube / β-cyclodextrin complex

Method used

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  • Electrochemical sensor used for bisphenol A detection
  • Electrochemical sensor used for bisphenol A detection
  • Electrochemical sensor used for bisphenol A detection

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] The electrochemical sensor of the present invention includes glassy carbon electrodes, and a sensitive film is coated on the glassy carbon substrate.

[0055] The preparation method of electrochemical sensor of the present invention is as follows:

[0056] (1) Preparation of mono-(6-hexamethylenediamine)-β-cyclodextrin: add 10 g of hexamethylenediamine and 30 mL of refined DMF to 5 g of mono-(6-p-toluenesulfonyl)-β-cyclodextrin React at 75°C for 4h, settle with acetone, dissolve the precipitate with 10mL water-methanol (volume ratio 3:1), and then settle-dissolve, repeat 5 times and then dry under vacuum at 50°C for 72h to obtain mono-(6-hexyl diamino)-β-cyclodextrin.

[0057] (2) Place 200 mg of dry single-walled carbon nanotubes in a 100 mL round bottom flask, slowly add 20 mL of mixed acid (98% concentrated sulfuric acid and 65% concentrated nitric acid, volume ratio is 3:1) solution, and ultrasonically disperse for 30 min Transfer to a 20°C oil bath for constant t...

Embodiment 2

[0065] Dissolve 1 mg of the prepared carbon nanotube / β-cyclodextrin complex in 2 mL of twice-distilled water, and then disperse it fully by ultrasonic dispersion to obtain a carbon nanotube / β-cyclodextrin complex dispersion , the concentration of the aqueous dispersion is 0.0005mg / L;

[0066] Take 20 μL carbon nanotube / β-cyclodextrin complex dispersion liquid and drop it on the surface of glassy carbon electrode, and the electrochemical sensor covered with sensitive film is obtained after solvent volatilization.

[0067] With the electrochemical sensor gained in the present embodiment to 10 -8 mol / L bisphenol A is detected, and its oxidation peak current is close to that of Example 1.

Embodiment 3

[0069] Dissolve 10 mg of the prepared carbon nanotube / β-cyclodextrin complex in 2 mL of twice-distilled water, and then disperse it fully by ultrasonic dispersion to obtain a carbon nanotube / β-cyclodextrin complex dispersion , the concentration of the aqueous dispersion is 0.005mg / L;

[0070] Take 2 μL carbon nanotube / β-cyclodextrin complex dispersion liquid and drop it on the surface of glassy carbon electrode, and the electrochemical sensor covered with sensitive film is obtained after the solvent evaporates.

[0071] Use this electrochemical sensor for 10 -8 mol / L bisphenol A is detected, and its oxidation peak current is close to that of Example 1.

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Abstract

The invention discloses an electrochemical sensor used for bisphenol A detection, which belongs to the technical field of electrochemical analysis detection. The invention also discloses a preparation method for the electrochemical sensor and an application of detecting bisphenol A in a single pattern. The preparation method for the electrochemical sensor comprises the following steps: grafting beta-cyclodextrin to the surface of a carbon nano tube, wherein the beta-cyclodextrin can be easily dispersed into secondary distilled water; dropwise adding a dispersion to a glassy carbon electrode; and evaporating to dry a solvent to obtain the electrochemical sensor constructed by a sensitive film and the glassy carbon electrode. The electrochemical sensor has high sensitivity on detecting the bisphenol A and high stability, and the detection lower limit reaches 1*10-9mol / L.

Description

technical field [0001] The invention relates to an electrochemical sensor for detecting bisphenol A, a preparation method and application thereof. Background technique [0002] Bisphenol A (Bisphenol A, BPA) is a phenolic environmental estrogen and is the main raw material for the production of polycarbonate (PC) and epoxy resin (EP). The exposure dose of bisphenol A in the population will have certain effects on the body, mainly including the reproductive system, embryonic development, central nervous system, tumor occurrence, etc. Even trace concentrations of bisphenol A have negative effects on human reproduction and the viability of offspring . A British study (The Journal of the American Medical Association, 2008, 300: 1303) showed that bisphenol A, which is widely present in plastic products including baby bottles, is associated with increased incidence of diabetes and heart disease; the US Environmental Protection Agency Bisphenol A has long been included in the bla...

Claims

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Application Information

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IPC IPC(8): G01N27/26G01N27/30C08B37/16
Inventor 黎华明高勇曹宇宋桂玲罗旭俊杨端光陈红飙
Owner XIANGTAN UNIV
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