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Method for detecting melamine by electrochemical luminescence

A technology for detection of melamine and luminescence, which is applied in the field of high-sensitivity electrochemiluminescence detection, can solve the problems that the detection limit cannot meet the requirements, the operation of the detection process is complicated, and the detection range is not wide enough to achieve wide detection linear range, good reproducibility, The effect of low detection limit

Inactive Publication Date: 2012-05-30
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Moreover, the minimum detection limit cannot meet the requirements, the detection range is not wide enough, the detection process is complicated to operate, and the instruments used are generally expensive
However, there is no relevant report on the use of electrochemiluminescence for the detection of melamine.

Method used

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  • Method for detecting melamine by electrochemical luminescence
  • Method for detecting melamine by electrochemical luminescence
  • Method for detecting melamine by electrochemical luminescence

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Use the MPI-B type electrochemiluminescence analyzer, select the concentration of terpyridine ruthenium as 10-3mol / L, then add melamine to observe its influence on ECL, set the high voltage of the photomultiplier tube to 900V, and the scanning voltage to 0-1.5 V, the photomultiplier tube adopts two-stage amplification. The working electrode used is an Au electrode, and the buffer salt is 0.1M borate buffer solution with pH=10. To detect the luminescent signal of the solution, the concentration range of melamine is 10 -10 ~10 -5 mol / L, the change of its ECL luminous intensity has a good linear relationship with the logarithm of the concentration of melamine, the results are as follows figure 1 shown. Tests show that the ECL strength after adding melamine will be significantly higher than the ECL strength before adding melamine, and the change value of ECL strength and the logarithm of the melamine concentration are within 1×10 -10 mol / L~1×10 -5 Good linear relations...

Embodiment 2

[0026] Use MPI-B type electrochemiluminescence analyzer, select the concentration of ruthenium phenothiazine as 10 -4 mol / L, then add melamine to observe its effect on ECL, set the high voltage of the photomultiplier tube to 900V, and the scanning voltage to 0-1.5V, and the photomultiplier tube adopts two-stage amplification. The working electrode used is an Au electrode, and the buffer salt is 0.1M borate buffer solution with pH=10. Detect the luminescent signal of the solution, when the concentration of melamine is 10 -11 mol / L~10 -3 mol / L, the change of its ECL luminescence intensity has a good linear relationship with the logarithm of the concentration of melamine. The result is as figure 2 shown. The test shows that with the addition of melamine, the ECL gradually weakens, and the change value of the ECL intensity is in the range of 1×10 logarithm of the concentration of melamine. -11 mol / L~1×10 -3 The concentration range of mol / L melamine showed a good linear rela...

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Abstract

The invention belongs to the field of high-sensitivity electrochemical luminescence detection and relates to a method for detecting melamine by the electrochemical luminescence. The method comprises the steps of: dissolving bipyridine ruthenium / osmium compounds which are used as luminescent materials and melamine which is used as both one of co-reactant and a detected object into buffer solution of a phosphoric acid or buffer solution of boric acid, and scanning the mixture in a potential range from 0 to 1.8 V by an electrochemical method; and meanwhile, collecting a generated optical signal by an optical detector and processing data by a computer to obtain a detection result. The method has the advantages that: the melamine can be detected more efficiently; the detection limit is lower; the linear detection range is wider; the sensitivity is high; and the repeatability is good and the test can be completed in an instance. Thus, the method is applicable to the detection of all the melamine-containing substances and all the electrochemical luminescence detectors.

Description

technical field [0001] The invention belongs to the field of high-sensitivity electrochemiluminescence detection, and in particular relates to a method for electrochemiluminescence detection of melamine. Background technique [0002] Melamine (English name: Melamine), referred to as triamine, commonly known as melamine, protein essence, also known as 2,4,6-triamino-1,3,5-triazine, 1,3,5-triazine-2, 4,6-triamine, 2,4,6-trisemicarbazide, melamine, cyanuronamide. It is a triazine nitrogen-containing heterocyclic organic compound, an important nitrogen-heterocyclic organic chemical raw material, and also a metabolite of the pesticide cyromazine. It is widely used in plastics, papermaking, textile, leather, electrical, pharmaceutical and other industries. An important post-processing product of urea. Melamine is a non-food chemical substance, and it is strictly forbidden to add it to food. On September 16, 2008, the General Administration of Quality Supervision, Inspection and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/76C09K11/06
Inventor 刘凤玉孙世国杨雪
Owner DALIAN UNIV OF TECH