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Visualization detecting aquagel of melamine and preparing method thereof

A melamine and hydrogel technology, which is applied in the field of visual analysis, can solve the problems of indistinguishable volume changes with the naked eye, and achieve the effects of easy promotion, high sensitivity and simple operation.

Inactive Publication Date: 2010-10-27
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the volume changes in these responses are indistinguishable to the naked eye

Method used

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  • Visualization detecting aquagel of melamine and preparing method thereof
  • Visualization detecting aquagel of melamine and preparing method thereof
  • Visualization detecting aquagel of melamine and preparing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A hydrogel for visual detection of melamine is a superimposed double-layer hydrogel, and the double-layer hydrogel is composed of a layer of sensitive hydrogel prepared by molecular imprinting technology and a layer of non-sensitive hydrogel glued together to form.

Embodiment 2

[0031] A kind of preparation method of the visual detection hydrogel of melamine adopts following steps:

[0032] Step 1) Dissolving the monomer, crosslinking agent and initiator of the hydrogel in water at a molar ratio of 100 to 10:100 to 0.1:10 to 0.1 to obtain a non-sensitive hydrogel polymer solution, a hydrogel The ratio of the total weight of the monomer, crosslinking agent and initiator to the volume of the obtained non-sensitive hydrogel polymer solution is 2~25:50 (W / V, g / ml), and then the non-sensitive hydrogel solution Add it to a two-layer glass mold with a strip thickness of 25-1000 μm and polymerize to form a non-sensitive hydrogel film with a thickness of 25-1000 μm.

[0033] The monomer of the hydrogel is a monoalkenyl-containing molecule, such as acrylamide, acrylic acid, methacrylic acid, etc.;

[0034] In the above step 1) of this embodiment, the monomer, crosslinking agent and initiator of the hydrogel with a molar ratio of 100:100:10, 10:0.1:0.1 or 65:12...

Embodiment 3

[0050] Soak the fully washed double-layer hydrogel strips in 2ml of commercially available fresh milk (one part with 2ppm melamine added, one part without melamine), shake for 15 minutes, take out distilled water and wash, and observe the change of its shape , refer to figure 2 , it can be seen that the shape of the double-layer hydrogel strip in fresh milk containing melamine has changed compared with the blank sample.

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Abstract

The invention discloses visualization detecting aquagel of melamine which is mutually folded double-layer aquagel. Sensitive aquagel and non-sensitive aquagel are bound together to compose the double-layer aquagel. In the preparing method, monomer, cross linker and evocating agent of the aquagel are dissolved in water to obtain non-sensitive aquagel polymer fluid, and then the non-sensitive aquagel polymer fluid is added in a mould to be polymerized into a non-sensitive aquagel film; the non-sensitive aquagel film is tiled on a piece of glass for the dehydration, and then the dehydrated non-sensitive aquagel film, the glass and a holding strip compose the mould; functional monomer, cross linker, melamine and evocating agent of print aquagel are dissolved in water to obtain print aquage polymer fluid which is then added in the mould to be polymerized into a sensitive print aquagel film, and a double-layer aquagel film is formed; the prepared double-layer aquagel film is cut into stripsand is washed in acid solution to remove melamine molecules, wherein, the pH value of the acid solution is less than 3. Then, the prepared doube-layer aquagel is washed in pure water until the shape is unchanged.

Description

technical field [0001] The invention relates to a melamine visual detection material and a preparation method thereof. By preparing a molecularly imprinted hydrogel, which can deform in response to melamine molecules in the environment. Specifically, the present invention relates to the use of molecular imprinting technology to prepare imprinted hydrogels sensitive to melamine, and then to form double gels of sensitive imprinted hydrogels and non-sensitive hydrogels to obtain a visualized hydrogel. After simple pretreatment of the sample, the presence of melamine in the sample can be judged through the deformation of the visualized hydrogel. The invention belongs to the technical field of visual analysis. Background technique [0002] Melamine (English name Melamine) is a triazine nitrogen-containing heterocyclic organic compound, an important nitrogen heterocyclic organic chemical raw material. Due to the flaws in the protein content testing methods of the food and feed ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N30/00G01N31/22B01J20/291B01J20/285B01J13/00
Inventor 董健成曦钱卫平
Owner SOUTHEAST UNIV