Melamine selective electrode and preparation method thereof

A melamine and selective technology, applied in the fields of chemical sensors and electro-analytical chemistry, can solve the problems of unsuitable on-site detection, expensive instruments, high analysis costs, etc., and achieve the effects of low analysis cost, fast detection speed and simple structure

Inactive Publication Date: 2011-07-27
NINGBO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The primary technical problem to be solved by the present invention is to overcome the deficiencies of several existing methods for detecting the content of melamine in milk and dairy products, including: complex sample pretreatment, professional operators, expensive instruments, high analysis cost, and high detection cost. It takes a long time and is not suitable for on-site detection, etc. An all-solid-state melamine selective electrode is provided, which has high sensitivity, good selectivity, fast detection speed, high precision and accuracy, simple instruments used, and analytical Low cost, easy to operate, easy to carry, etc.

Method used

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  • Melamine selective electrode and preparation method thereof
  • Melamine selective electrode and preparation method thereof
  • Melamine selective electrode and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0034] The first step: the preparation of the dichloromethane solution of PMMA-PDMA containing electroactive substance, the steps are as follows:

[0035] ① Preparation of electroactive material:

[0036] Add 0.05g of melamine into 100mL of 0.01mol / L hydrochloric acid solution, after completely dissolving, mix with 10 -2 mol / L phosphotungstic acid solution 50mL mixed under stirring, let stand for 12h, filter, rinse the precipitate with deionized water 10 times, dry in a vacuum dryer for 12h, and then obtain the electroactive material;

[0037] ②Preparation of PMMA-PDMA dichloromethane solution:

[0038] Add 1 mL of methyl methacrylate (MMA) and 4 mL of dimethylaminoethyl methacrylate (DMA) into 5 mL of ethyl acetate, pass nitrogen gas for 10 min, add 3.4 mg of initiator azobisisobutyronitrile, stir and dissolve , continue stirring at 85°C for 16h, after the reaction is over, add the above product dropwise to 800mL distilled water, stir vigorously, dissolve the white precipit...

Embodiment 2

[0052] The base electrode (2) is an Au electrode;

[0053] Others are the same as embodiment 1, such as Figure 2-b .

Embodiment 3

[0055] Preparation of electroactive material: 0.1g melamine was added in 200mL of 0.05mol / L hydrochloric acid solution, mixed with 100mL 10 -2 The mol / L phosphotungstic acid solution was stirred and mixed, allowed to stand for 10 hours, filtered, the precipitate was rinsed with deionized water for 10 times, and dried in a vacuum dryer for 24 hours to obtain the electroactive material;

[0056] Others are the same as embodiment 1, such as Figure 2-c .

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Abstract

The invention discloses a melamine selective electrode and a preparation method thereof, and the electrode comprises a substrate electrode which is coated with a poly-o-toluidine (POT) membrane on the surface, a polymethyl methacrylate-dimethylaminoetyl methacrylate (PMMA-PDMA) sensitive membrane with an electroactive substance, a glass cannula, epoxy resin, and a wire. The melamine selective electrode provided by the invention has an all-solid-state form, uses a PMMA-PDMA copolymer membrane without any plasticizer to overcome the disadvantages of a traditional PVC membrane of difficult adhesion, easy leakage, poor thermal stability, and the like, uses a POT membrane to inhibit the water layer formation between the sensitive membrane and the substrate electrode, and has the advantages of being stable in measuring voltage, low in detection limit, simple in structure, convenient to use, capable for miniaturization, etc. The detection of melamine in milk and dairy products by using the melamine selective electrode provided by the invention as an indicator electrode and adopting a potential analysis method has high sensitivity, good selectivity, quick detection speed, simple equipmentrequired, low analysis cost, and can realize on-site detection.

Description

technical field [0001] The invention relates to the technical fields of electroanalytical chemistry and chemical sensors, in particular to a preparation method of an all-solid-state melamine selective electrode. Background technique [0002] Melamine (Melamine, MA), commonly known as melamine, protein essence, is a triazine nitrogen-containing heterocyclic organic compound, used as a chemical raw material, not a food raw material, nor a food additive. After melamine enters the human body, it undergoes a hydrolysis reaction to generate cyanuric acid. The cyanuric acid and melamine form a large network structure, which affects the kidneys and bladder, resulting in stones. In order to ensure the quality and safety of milk and dairy products, my country has formulated the temporary management limit value of melamine in milk and dairy products: the limit value of melamine in infant formula milk powder is 1mg / kg; liquid milk (including raw milk), milk powder, other The limit value...

Claims

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Application Information

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IPC IPC(8): G01N27/333G01N27/49
Inventor 盖盼盼郭智勇
Owner NINGBO UNIV
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