Preparation method of carbon nano tube modified electrode used for detecting melamine

A technology of melamine and carbon nanotubes, applied in the field of high-sensitivity electrochemiluminescence detection, to achieve high specific surface area, good reproducibility, and lower detection limit

Inactive Publication Date: 2013-01-16
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, it is reported that carbon nanotubes are modified to the electrode surface by using materials such as polymers and binders, (a) G.F.Jie, P.Liu, L.Wang, S.S.Zhang, Electrochemistry Communications, 2010, 12(1), 22-26; b) G.F. Jie, J.J. Zhang, D.C. Wang, C. Cheng, H.Y. Chen, J.J. Zhu, Anal. Chem., 2008, 80(11), 4033-4039; c) X. Yang, R. Yuan , Y.Q.Chai, Y.Zhuo, L.Mao, Z.Y.Liu, H.L.Su, S.Y.Yuan, Electroanalysis, 2009, 21(14), 1636-1640; d) B.Xing, X.B.Yin, Biosensors & Bioelectronics, 2009, 24 (9), 2939-2942.) to study its electrochemiluminescent behavior, but there is no relevant report on the use of carbon nanotube modified electrodes for melamine detection

Method used

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  • Preparation method of carbon nano tube modified electrode used for detecting melamine
  • Preparation method of carbon nano tube modified electrode used for detecting melamine

Examples

Experimental program
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Effect test

Embodiment 1

[0017] Disperse 0.25 mg of carbon nanotubes in 5 mL of DMF solvent, then add this nanotube solution to 5 mL of PVA adhesive with a concentration of 5%, disperse evenly, and then apply the solution on the electrode surface, and the resulting carbon nanotube modified electrode , to dry at room temperature.

Embodiment 2

[0019] Disperse 0.25 mg of carbon nanotubes in 5 mL of water, then add the nanotube solution to 5 mL of Nafion adhesive with a concentration of 5%, disperse evenly, and then apply the solution on the surface of the electrode, the resulting carbon nanotube modified electrode, at room temperature Set aside to dry.

Embodiment 3

[0021] Use the MPI-B type electrochemiluminescence analyzer, configure the concentration of ruthenium terpyridine with 0.1M borate buffer solution of pH=10 to be 10 -3 mol / L solution, the high voltage of the photomultiplier tube is set to 900V, the scanning voltage is 0.2-2.0V, and the photomultiplier tube adopts one-stage amplification. The working electrode used was the nanotube-modified GC electrode in Example 1, and the luminescence signal of the solution was detected without adding melamine, and the measured electrochemiluminescence intensity was 2,137,700.

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Abstract

The invention discloses a preparation method of a carbon nano tube modified electrode used for detecting melamine, and belongs to the technical field of electrochemiluminescence detection. The method comprises the following steps of: dispersing a carbon nano tube into solvents such as dimethyl formamide (DMF), tetrahydrofuran, methanol, ethanol, water and the like; mixing the solution of the carbon nano tube and adhesives such as chitosan, Nafion, polyvinyl alcohol and the like; uniformly dispersing the mixture and then coating the mixture on the surface of an electrode to prepare the carbon nano tube modified electrode; and airing the prepared carbon nano tube modified electrode for later use. The electrode has the advantages of capability of detecting the melamine more effectively, lowest detection limit of 10 to 13mol / L, high detection sensitivity and repeatability and suitability for the detection of all materials containing the melamine and all electrochemiluminescence detection devices.

Description

technical field [0001] The invention belongs to the field of high-sensitivity electrochemiluminescence detection, and in particular relates to a method for preparing a carbon nanotube modified electrode for melamine detection. Background technique [0002] On April 22, 2010, the Ministry of Health announced the new national dairy product safety standard, which did not set melamine-related regulations. The relevant person in charge clearly pointed out that melamine is not a food raw material, nor is it a food additive, and it is strictly forbidden to artificially add melamine to food. The melamine incident that shocked the world in 2008 made each of us still have lingering fears. In the future, it will not be ruled out that unscrupulous traders will defy the law for their own self-interest. Therefore, it is of great significance to develop a simple and efficient detection method for melamine. [0003] Ruthenium terpyridine Ru(bpy) 3 2+ Electrochemiluminescence (ECL) has t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/30G01N21/76
Inventor 刘凤玉孙世国杨雪
Owner DALIAN UNIV OF TECH
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