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Preparation of hydrophilic polymer and application thereof in detecting mercury ions based on change of fluorescence and color

A technology of hydrophilic polymers and mercury ions, applied in fluorescence/phosphorescence, analysis by making materials undergo chemical reactions, and material analysis by observing the impact on chemical indicators, etc., can solve the problems of poor solubility, molecular probes, etc. Problems such as decreased binding performance with the ion to be detected

Inactive Publication Date: 2011-08-17
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the solvation tendency of the binding sites of metal ions and small molecule probes in aqueous solvents is stronger than that in organic solvents under the same conditions, which reduces the binding performance of molecular probes to the ions to be detected.
Moreover, most small molecule probes have poor solubility in water and are only suitable for organic solvents, while for the detection of heavy metal ions, they are basically carried out in biological environments in practical applications, so they can show strong recognition in water Performance compounds have a wide range of practical value
Therefore, it is a great challenge to develop an inexpensive and sensitive sensor that can detect mercury ions in water

Method used

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  • Preparation of hydrophilic polymer and application thereof in detecting mercury ions based on change of fluorescence and color
  • Preparation of hydrophilic polymer and application thereof in detecting mercury ions based on change of fluorescence and color
  • Preparation of hydrophilic polymer and application thereof in detecting mercury ions based on change of fluorescence and color

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Synthesis of water-soluble copolymer polyvinylpyrrolidone-glycidyl methacrylate, referred to as P (VP- co -GMA).

[0031] Put the solvent dioxane (30mL), 1.11g (0.01mol) vinylpyrrolidone, 0.44g (0.003mol) glycidyl methacrylate and 0.049g (0.0003mol) AIBN in the flask, fill it with nitrogen for 30 minutes, and seal it , react in a water bath at 70°C for 24 hours. The product was precipitated in ether, then dissolved in dioxane, and repeated 5 times to remove unreacted reactants and polymers with small molecular weights. Vacuum dry.

[0032] (2) Synthesis of rhodamine B hydrazide grafted hydrophilic copolymer, referred to as P (VP- co -GMA-g-RhBH).

[0033] Dissolve 0.228g of rhodamine B hydrazide and 1.0g of the hydrophilic copolymer obtained in step (1) in 25mL of DMF, fill with nitrogen for 30 minutes, seal, and react at 55°C for 12h. The product was precipitated in petroleum ether, then dissolved in dioxane, and repeated 5 times to remove unreacted small mo...

Embodiment 2

[0035] A detection kit for mercury ions. The reagent stock solution in the detection kit is the buffer solution of the rhodamine B hydrazide grafted hydrophilic polymer, the pH value of the buffer solution is 6~8, the solvent of the buffer solution is water, and the rhodamine in the buffer solution is The concentration of B hydrazide grafted hydrophilic polymer is 0.01g / L~1.0g / L.

[0036]In the method for detecting mercury ions with the mercury ion detection kit, the detection and identification of mercury ions are realized by observing the color change of the buffer solution and the enhancement of fluorescence.

[0037] Take an appropriate amount of the rhodamine B hydrazide grafted hydrophilic polymer synthesized in step (2) of Example 1 and dissolve it in a buffer solution with a pH value of 7.2 to prepare a stock solution with a concentration of 0.01 g / L. Pipette 14 A portion of 3mL of this solution was used as the detection solution. Then, an equimolar amount of Na was ...

Embodiment 3

[0041] A mercury ion detection test paper. The rhodamine B hydrazide grafted hydrophilic polymer is prepared as a solution and directly coated or sprayed on the surface of the substrate;

[0042] The concentration of the hydrophilic polymer solution grafted with rhodamine B hydrazide is 0.5g / L~20g / L, and the solvent is water, ethanol, tetrahydrofuran, acetonitrile or their mixed solution;

[0043] The base material is selected from test paper, non-woven fabric, polymer film, cellulose film, or starch film.

[0044] In the method for detecting mercury ions with the mercury ion detection test paper, the detection and identification of mercury ions are realized through the color change of the test paper.

[0045] Prepare a 0.5 g / L ethanol solution of the rhodamine B hydrazide grafted hydrophilic polymer synthesized in step (2) of Example 1, coat it on the surface of filter paper or cellophane, and cut it into 3×0.5 square centimeters after drying. Dip the test paper with concen...

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Abstract

The invention discloses preparation of hydrophilic polymer and application thereof in detecting mercury ions based on the change of fluorescence and color, particularly a rhodamine B hydrazide grafted hydrophilic polymer probe applied to the detection of mercury ions in aqueous medium based on the change of fluorescence and color and a kit and test paper applied to the detection of the mercury ions by using the probe, belonging to the technical field of material preparation and heavy metal ion detection. The polymer containing a rhodamine chromophore is prepared by subjecting rhodamine B hydrazide and propylene oxide on the side chain of polyvinylpyrrolidone-glycidyl methacrylate which is a water-soluble polymer to ring-opening reaction, has good water solubility and can be applied to selectively detecting the mercury ions by using visual colorimetry and fluorescence detection. The probe realizes the high-sensitivity and high-selectivity rapid quantitative or semi-quantitative detection of the trace mercury ions in the aqueous medium, has a simple synthetic route, low cost and convenience of use, is applicable to amplified synthesis and actual production and has great application prospects in the field of medicine, biology and environmental science and the like.

Description

technical field [0001] Preparation and application of a hydrophilic polymer for detecting mercury ions based on fluorescence colorimetric changes, specifically related to preparation of rhodamine B hydrazide graft polymer and mercury ion detection kit in water medium based on the polymer The invention relates to the preparation and application of detection test paper, which belong to the technical field of material preparation and the technical field of ion detection composed of water-soluble polymers for identifying and optically detecting heavy metal ions. Background technique [0002] Mercury is one of the highly toxic heavy metal elements. It is volatile and can accumulate in the atmosphere, soil, ocean, etc. Once mercury elements / mercury ions enter the ocean, bacteria can convert inorganic mercury into organic mercury (such as methylmercury ), and continue to accumulate in the organisms in the ocean, especially in edible fish, and finally absorbed by humans through the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F8/32C09D139/06G01N33/52G01N21/78C09D133/26C08F226/10C08F220/56C08F220/32G01N21/64
CPCC08F8/32C08F220/56C08F226/10C09B69/103G01N21/643G01N21/78G01N33/52C08F220/325
Inventor 罗静姜思思苟超吴海强王宇王宝清秦少辉刘晓亚
Owner JIANGNAN UNIV
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