Preparation and application of a chitosan-modified microporous polymer nanomaterial

A technology of microporous polymers and nanomaterials, applied in the direction of analyzing materials, electrochemical variables of materials, and material analysis through electromagnetic means, etc., can solve the problem of inability to achieve ONOO-real-time monitoring, complex pretreatment, time-consuming and high cost, etc. question

Active Publication Date: 2021-03-23
NORTHWEST NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these methods are well accepted, they cannot be achieved in ONOO environments due to their complex preprocessing, lack of required specificity, time-consuming and high cost. - real-time monitoring

Method used

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  • Preparation and application of a chitosan-modified microporous polymer nanomaterial
  • Preparation and application of a chitosan-modified microporous polymer nanomaterial
  • Preparation and application of a chitosan-modified microporous polymer nanomaterial

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The preparation of the microporous polymer nanomaterial CTS-MPNS of embodiment 1, chitosan modification

[0037] Take 0.3g of m-aminophenol, add it into the reaction container with the mixed solution (60ml of ultrapure water and 30ml of absolute ethanol), stir magnetically at 32°C until it is completely dissolved, add 0.6ml of ammonia water (25%), and stir for 15 minutes Add 0.3ml formaldehyde, stir until a milky white suspension appears, continue to stir for 2 hours; then add 20ml mass concentration of 0.2% chitosan acetic acid solution (0.2g chitosan dissolved in 1% acetic acid solution) and stir for 3 hours; After cooling to room temperature, the obtained product was centrifuged and washed several times with ultrapure water (to remove unreacted formaldehyde), dried in vacuum at 60°C for 24 hours, and ground to obtain the chitosan-modified microporous polymer nanomaterial CTS-MPNS.

Embodiment 2

[0038] Embodiment 2, preparation of modified electrode CTS-MPNS / GCE

[0039] (1) Pretreatment of the glassy carbon electrode: the glassy carbon electrode is polished into a mirror surface with 0.30 μm and 0.05 μm Al2O3 suspension in sequence, and then ultrasonically cleaned with 95% ethanol and double distilled water in sequence , to obtain the treated glassy carbon electrode; then use the glassy carbon electrode as the working electrode, the platinum column as the counter electrode, and the saturated calomel electrode as the reference electrode in a three-electrode system. M potassium chloride electrolyte solution, carry out cyclic voltammetry scanning (scanning speed is 50mV / s), finally take out the electrode and rinse with twice distilled water and dry;

[0040] (2) Preparation of the modified electrode CTS-MPNS / GCE: Take 0.003 g of the chitosan-modified microporous polymer nanomaterial CTS-MPNS prepared in Example 1, and disperse it in 3 ml of water to make a concentration...

Embodiment 3

[0041] Example 3. Modified electrode CTS-MPNS / GCE detects ONOO in the solution - concentration

[0042] The modified electrode CTS-MPNS / GCE is used as the working electrode, the platinum column is used as the counter electrode, and the saturated calomel electrode is used as the reference electrode to form a three-electrode system. - The 0.2M phosphate buffer solution with pH=7.0 was used as the electrolyte, and the scanning was carried out by chronoamperometry under the working potential of 1.1V. According to the response current Ip and ONOO - Linear regression equation for concentration: Ip (μA) = 0.0698 [ONOO - ] + 0.2039 calculates ONOO - concentration.

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Abstract

The invention provides a chitosan-modified microporous polymer nanomaterial. In an ultrapure water-absolute ethanol mixed solution, with m-aminophenol and formaldehyde as substrates, a microporous polymer nanomaterial MPNS is prepared under the catalytic action of ammonium hydroxide; then the microporous polymer nanomaterial is modified with chitosan to obtain the chitosan-modified microporous polymer nanomaterial CTS-MPNS. With an electrochemically-modified electrode CTS-MPNS / GCE constructed with the CTS-MPNS as a working electrode, a platinum column as a counter electrode, a saturated calomel electrode as a reference electrode and a 0.2M phosphate buffered solution with the pH of 7.0 as an electrolyte, under the working potential of 1.1 V, a chronoamperometry method is adopted for scanning ONOO- with different concentrations. When the concentration of ONOO- is within a certain concentration range, response current Ip and the ONOO- concentration have a good linear relationship, and itis indicated that the modified electrode has a good application prospect in biosensors.

Description

technical field [0001] The invention relates to a preparation method of a microporous polymer nanomaterial, in particular to a preparation of a chitosan-modified microporous polymer nanomaterial, which is mainly used as an electrochemical sensor for detecting peroxynitrite anion (ONOO) in a solution. - ), belonging to the technical field of composite materials and the technical field of electrochemical detection. Background technique [0002] In recent years, porous organic polymers with lightweight all-organic frameworks, permanently open pore structures, and high stability have become research hotspots in the field of porous materials. Compared with traditional inorganic-organic hybrid porous materials, the skeleton structure of porous organic polymer materials is composed entirely of organic molecules connected by covalent bonds. This characteristic of porous organic polymer materials has greatly expanded the synthesis methods and construction ideas of porous materials. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G81/00G01N27/30G01N27/416G01N27/42
CPCC08G81/00G01N27/301G01N27/308G01N27/416G01N27/423
Inventor 刘秀辉刘福鑫李琳张榕津张彬雁
Owner NORTHWEST NORMAL UNIVERSITY
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