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CN118185052B - Zirconium porphyrin metal organic framework nano-enzyme and preparation method and application thereof - Google Patents

Zirconium porphyrin metal organic framework nano-enzyme and preparation method and application thereof Download PDF

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CN118185052B
CN118185052B CN202410615026.0A CN202410615026A CN118185052B CN 118185052 B CN118185052 B CN 118185052B CN 202410615026 A CN202410615026 A CN 202410615026A CN 118185052 B CN118185052 B CN 118185052B
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organic framework
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porphyrin metal
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CN118185052A (en
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熊勇华
谭新柳
黄小林
李倩影
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Nanchang University
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Abstract

The invention relates to a nano biological material, in particular to a zirconium porphyrin metal organic framework nano enzyme, a preparation method and application thereof. Mixing MESO-tetra (4-carboxyphenyl) porphin, zirconium tetrachloride, aryl dicarboxylic acid and a morphology regulator in a first solvent, reacting at 120-140 ℃, washing and separating precipitate to obtain a zirconium porphyrin metal organic framework material; dispersing the zirconium porphyrin metal organic framework material in a second solvent, adding a metal precursor solution, reacting at 80-90 ℃, washing and separating precipitate to obtain the zirconium porphyrin metal organic framework nano-enzyme. The zirconium porphyrin metal organic framework nano-enzyme has good peroxidase activity, and can be used for preparing medicines or auxiliary materials for resisting bacterial infection or preventing and treating biological films.

Description

Zirconium porphyrin metal organic framework nano-enzyme and preparation method and application thereof
Technical Field
The invention relates to a nano biological material, in particular to a zirconium porphyrin metal organic framework nano enzyme, a preparation method and application thereof.
Background
Natural enzymes are a class of organic molecules synthesized from living bodies, including proteins, DNA or RNA, which have been used in fields including industry, food fermentation, biological medicine, etc., due to their high specificity and superior catalytic activity. But are limited by their high cost of preparation, low environmental tolerance (substantial loss of catalytic activity especially in high temperature, extreme pH, high salt, etc.), and the use of natural enzymes in long-term, complex, extreme environments is severely limited.
Nano-enzyme, which is a new artificial enzyme, is attracting more and more attention from researchers because of its catalytic ability and inherent physicochemical advantages (low preparation cost, high stability) of materials. However, the current considerable nano-enzymes have the problems of blind synthesis, insufficient activity, fuzzy structure-activity relationship and the like, and the development and the high-grade application of the high-activity nano-enzymes are hindered.
Disclosure of Invention
Based on the above, the invention provides a zirconium porphyrin metal organic framework nano-enzyme, a preparation method and application thereof, and at least solves one problem in the prior art.
In a first aspect, the invention provides a method for preparing zirconium porphyrin metal organic framework nano-enzyme, which comprises the following steps:
mixing MESO-tetra (4-carboxyphenyl) porphin (also known as MESO-tetra (4-carboxyphenyl) porphin, TCPP), zirconium tetrachloride, aryl dicarboxylic acid and a morphology regulator in a first solvent, reacting at 120-140 ℃, washing and separating the precipitate to obtain a zirconium porphyrin metal organic framework material;
dispersing the zirconium porphyrin metal organic framework material in a second solvent, adding a metal precursor solution, reacting at 80-90 ℃, washing and separating precipitate to obtain the zirconium porphyrin metal organic framework nano-enzyme.
In a second aspect, the invention provides a zirconium porphyrin metal organic framework nano-enzyme, which is obtained by a preparation method of the zirconium porphyrin metal organic framework nano-enzyme.
In a third aspect, the invention provides application of the zirconium porphyrin metal organic framework nano-enzyme in preparing medicines or auxiliary materials for resisting bacterial infection or preventing and treating biological films.
Due to the adoption of the technical scheme, the embodiment of the invention has at least the following beneficial effects:
(1) The zirconium porphyrin metal organic framework nano-enzyme is synthesized by a two-step method, the method is rapid and simple, the reaction condition is adjustable, the large-scale preparation can be realized, and the precise regulation and control of the nano-enzyme activity and rational design can be realized;
(2) Compared with the traditional nano-enzyme, the zirconium porphyrin metal organic framework nano-enzyme has different metal sites and pore wall microenvironments, has strictly defined active sites and adjustable catalytic microenvironments, and is an ideal model for researching the relationship between the nano-enzyme structure and the activity;
(3) The zirconium porphyrin metal organic framework nano enzyme has excellent stability, and can be stored for a long time, and is resistant to high temperature, acid, salt and various organic solvents.
Drawings
FIG. 1 is a morphology diagram of Zr-TCPP-H MOF in an embodiment of the invention.
FIG. 2 is a morphology diagram of Zr-TCPP-NH 2 MOF in an embodiment of the present invention.
FIG. 3 is a morphology diagram of Zr-TCPP-NO 2 MOF in an embodiment of the present invention.
FIG. 4 is a morphology diagram of Zr-TCPP-Br MOF according to an embodiment of the present invention.
FIG. 5 is a diagram showing the morphology of Zr-TCPP (Ir) -H MOF in the example of the present invention.
FIG. 6 is a morphology diagram of Zr-TCPP (Ir) -NH 2 MOF in an example of the present invention.
FIG. 7 is a graph showing the morphology of Zr-TCPP (Ir) -NO 2 MOF in the example of the present invention.
FIG. 8 is a graph showing the morphology of Zr-TCPP (Ir) -Br MOF in an embodiment of the invention.
FIG. 9 shows the results of evaluation of the catalytic activity of Zr-TCPP (Fe) -H MOF in the examples of the present invention.
FIG. 10 shows the results of evaluation of the catalytic activity of Zr-TCPP (Ir) -H MOF in the examples of the present invention.
FIG. 11 shows the results of evaluation of the catalytic activity of Zr-TCPP (Ir) -NO 2 MOF in the examples of the present invention.
FIG. 12 shows the comparative results of the catalytic activities of Zr-TCPP (Fe) -H MOF, zr-TCPP (Ir) -NO 2 MOF in examples of the present invention.
Detailed Description
The following is a clear and complete description of the conception and technical effects produced thereby to fully illustrate the objects, aspects, and effects of the present invention.
How to synthesize high-performance nano-enzymes from the de novo design is clearly a prerequisite for widening and pushing nano-enzymes in the process of gradually replacing natural enzymes in practical application. Inspired that the catalytic micro-environment consisting of exquisite active sites and amino acids of the metalloprotease jointly determines the catalytic efficiency and the catalytic selectivity of the natural enzyme, the metal organic framework is introduced as a bionic design framework, has adjustable metal nodes and side chain functional groups, and can well simulate the active sites and the amino acid micro-environment of the protease, but the current design of the metal organic framework simulant is concentrated on single metal site regulation or side chain ligand regulation, so that the remarkable improvement of the catalytic activity of the nanoenzyme is fundamentally limited.
In order to solve the problems of high cost, low stability, insufficient activity, fuzzy structure-activity relation and the like of the existing natural enzymes, the development of a dual regulation strategy for metal sites and catalytic microenvironments of the metal organic framework nano-enzyme is an effective way for solving the problem of insufficient catalytic activity of the nano-enzyme, and accordingly, the invention provides a zirconium porphyrin metal organic framework nano-enzyme based on pore wall engineering and metal site synergistic enhancement of catalytic activity, and a preparation method and application thereof.
In a first aspect, the invention provides a method for preparing zirconium porphyrin metal organic framework nano-enzyme, which comprises the following steps:
Mixing MESO-tetra (4-carboxyphenyl) porphin, zirconium tetrachloride, aryl dicarboxylic acid and a morphology regulator in a first solvent, reacting at 120-140 ℃, washing and separating precipitate to obtain a zirconium porphyrin metal organic framework material;
dispersing the zirconium porphyrin metal organic framework material in a second solvent, adding a metal precursor solution, reacting at 80-90 ℃, washing and separating precipitate to obtain the zirconium porphyrin metal organic framework nano-enzyme.
The zirconium porphyrin metal organic frame nano-enzyme is a zirconium porphyrin metal organic frame nano-enzyme obtained by synthesizing a zirconium porphyrin metal organic frame in advance and then introducing different metal precursors through modification after synthesis. Wherein, the pre-synthesized zirconium porphyrin metal organic framework is a multivalent zirconium porphyrin metal organic framework synthesized under the solvothermal condition by taking aryl dicarboxylic acid and MESO-tetra (4-carboxyphenyl) porphin as mixed ligands, zirconium tetrachloride as metal precursors and benzoic acid or formic acid as regulator; and different metal precursors introduced by post-synthesis modification can be iridium chloride, rhodium chloride, ruthenium chloride, ferric chloride, cupric chloride, cobalt chloride or manganese acetate.
The zirconium porphyrin metal organic framework is a multivalent metal organic framework synthesized by two organic ligands (aryl dicarboxylic acid and MESO-tetra (4-carboxyphenyl) porphin) and zirconium chloride under solvothermal conditions, and in order to effectively enhance the enzyme-like catalytic activity of the zirconium porphyrin metal organic framework, a pore wall engineering and metal active site dual regulation strategy is introduced. Wherein pore wall engineering refers to rational screening of aryl dicarboxylic acids with different side chain groups to construct microenvironments with natural enzyme-like active sites; the metal site engineering is to introduce a series of noble metals and transition state metals with catalytic activity through post-modification by utilizing the inherent excellent metal chelating capability of MESO-tetra (4-carboxyphenyl) porphin; thus constructing the zirconium porphyrin metal organic framework nano-enzyme library with adjustable pore wall microenvironment and metal active sites.
In some alternative embodiments, the aryl dicarboxylic acid is at least one of terephthalic acid, 2-amino terephthalic acid, 2-bromo terephthalic acid, and 2-nitro terephthalic acid. Preferably, the aryl dicarboxylic acid is 2-nitroterephthalic acid.
In some alternative embodiments, the metal precursor solution is an iridium chloride solution, rhodium chloride solution, ruthenium chloride solution, ferric chloride solution, cupric chloride solution, cobalt chloride solution, or manganese acetate solution. Preferably, the metal precursor solution is an aqueous iridium chloride solution.
In some alternative embodiments, the morphology modifier is at least one of benzoic acid, formic acid.
In some alternative embodiments, the molar ratio of MESO-tetrakis (4-carboxyphenyl) porphine, zirconium tetrachloride, aryl dicarboxylic acid, and metal precursor solution is (1-3): (18-20): (13-15): (1-2). Preferably, the molar ratio of MESO-tetrakis (4-carboxyphenyl) porphine, zirconium tetrachloride, aryl dicarboxylic acid and metal precursor solution is 2:19:14:1.
In some alternative embodiments, the morphology modifier is used in an amount of 50.9 times (molar amount) the metal precursor and the morphology modifier is used in an amount of 16.5 times (molar amount) the metal precursor.
In some alternative embodiments, the first solvent is N, N-Dimethylformamide (DMF).
In some alternative embodiments, the second solvent is ethanol.
In a second aspect, the invention provides a zirconium porphyrin metal organic framework nano-enzyme, which is obtained by a preparation method of the zirconium porphyrin metal organic framework nano-enzyme.
The obtained zirconium porphyrin metal organic frame nano-enzyme has good peroxidase activity, wherein the zirconium porphyrin metal organic frame nano-enzyme obtained by taking 2-nitroterephthalic acid as a side chain ligand and iridium chloride as a metal source has more excellent catalytic activity compared with zirconium porphyrin metal organic frame nano-enzyme synthesized by other side chain ligands (terephthalic acid, 2-amino terephthalic acid and 2-bromo terephthalic acid) and metal sources (rhodium chloride, ruthenium chloride, ferric chloride, copper chloride, cobalt chloride and manganese acetate).
In a third aspect, the invention provides application of the zirconium porphyrin metal organic framework nano-enzyme in preparing medicines or auxiliary materials for resisting bacterial infection or preventing and treating biological films.
Some exemplary embodiments are described below.
Example 1
Zr-TCPP-H MOF was synthesized according to the following procedure:
(1) Respectively ultrasonically dissolving 45 mg zirconium chloride and 13.8 mg MESO-tetra (4-carboxyphenyl) porphine in 1 mL DMF in advance to prepare MESO-tetra (4-carboxyphenyl) porphine solution and zirconium tetrachloride solution;
(2) Ultrasonic dissolving 1200 mg benzoic acid and 23.7 mg terephthalic acid in 28 mL DMF solution to prepare a benzoic acid-terephthalic acid mixed solution;
(3) Sequentially adding the MESO-tetra (4-carboxyphenyl) porphine solution and the zirconium tetrachloride solution into the mixed solution of benzoic acid and terephthalic acid under intense stirring, dropwise adding 120 mu L of formic acid under intense stirring, and continuing stirring for 20min after the dropwise adding is finished;
(4) Transferring the mixed solution into a 50 mL polytetrafluoroethylene liner, and keeping 12: 12 h at 130 ℃;
(5) After cooling to room temperature, the resulting product was washed three times with DMF and ethanol by centrifugation at 12000 rpm, and finally the precipitate was collected and dried overnight in a vacuum oven at 60℃to give Zr-TCPP-H MOF.
Example 2
This embodiment is substantially the same as embodiment 1, except that: terephthalic acid was replaced with an equimolar amount of 2-amino terephthalic acid (25.8 mg) to give Zr-TCPP-NH 2 MOF.
Example 3
This embodiment is substantially the same as embodiment 1, except that: terephthalic acid was replaced with an equimolar amount of 2-bromoterephthalic acid (34.8 mg) to give Zr-TCPP-Br MOF.
Example 4
This embodiment is substantially the same as embodiment 1, except that: the terephthalic acid was replaced with an equimolar amount of 2-nitroterephthalic acid (30 mg) to give Zr-TCPP-NO 2 MOF.
Example 5
The zirconium porphyrin metal organic framework nano-enzyme (Zr-TCPP (Ir) -H MOF) is synthesized according to the following steps:
(1) Taking Zr-TCPP-H MOF 10 mg synthesized in the example 1, and dispersing the Zr-TCPP-H MOF 10 mg in 10 mL ethanol solution by ultrasonic wave to obtain Zr-TCPP-H MOF dispersion;
(2) An aqueous iridium chloride solution (6.15 mg/mL, 500. Mu.L) was added dropwise to the Zr-TCPP-H MOF dispersion under 500: 500 rpm stirring, and stirring was continued for 20: 20 min;
(3) Transferring the mixed solution into an oil bath kettle preheated to 85 ℃, and continuing to react at 300 rpm for 12 h;
(4) Cooling to room temperature, sequentially centrifugally washing the obtained product with DMF and ethanol for three times by 12000 rpm, finally collecting precipitate and drying the precipitate in a vacuum oven at 60 ℃ for overnight to obtain Zr-TCPP (Ir) -H MOF.
Example 6
This embodiment is substantially the same as embodiment 5, except that: the iridium chloride aqueous solution in example 5 was replaced with an equimolar amount of an aqueous solution of ferric chloride (5.55 mg/mL, 500. Mu.L) to give Zr-TCPP (Fe) -H MOF.
Example 7
This embodiment is substantially the same as embodiment 5, except that: the Zr-TCPP-H MOF synthesized in example 1 was replaced with an equal mass of the Zr-TCPP-NH 2 MOF synthesized in example 2 to give Zr-TCPP (Ir) -NH 2 MOF.
Example 8
This embodiment is substantially the same as embodiment 5, except that: the Zr-TCPP-H MOF synthesized in example 1 was replaced with an equal mass of the Zr-TCPP-Br MOF synthesized in example 3 to give a Zr-TCPP (Ir) -Br MOF.
Example 9
This embodiment is substantially the same as embodiment 5, except that: the Zr-TCPP-H MOF synthesized in example 1 was replaced with an equal mass of the Zr-TCPP-NO 2 MOF synthesized in example 4, to give a Zr-TCPP (Ir) -NO 2 MOF.
The above examples 1-4 gave zirconium porphyrin metal organic framework materials, and examples 5-9 gave zirconium porphyrin metal organic framework nanoezymes with tunable catalytic microenvironment and well defined metal sites, which were used for peroxidase-like activity evaluation as follows.
The method for evaluating the activity of the peroxidase-like comprises the following steps: 100. Mu.L of a zirconium porphyrin metal organic framework nano-enzyme dispersion (100. Mu.g/mL, dissolved in water) and 100. Mu. L H 2O2 (1 mM) were added to 700. Mu.L of TMB solution containing a final concentration of 4 mM for a period of time, the absorbance change at 500-800 nm was monitored, the A652 nm value was used as an index of its peroxidase activity, and the catalytic enzyme kinetics were determined as follows: the concentration of the immobilization material and TMB were 10 μg/mL and 4 mM, the concentration of H 2O2 was varied (0.2 mM, 0.4 mM, 1 mM, 2 mM and 4 mM), and its catalytic kinetics within 1 min were monitored.
As shown in fig. 1-8, the synthesized zirconium porphyrin metal organic frameworks of different side-chain ligands have uniform size distribution and are close in size; after the iridium is chelated, the morphology of the obtained metal organic frame nano enzyme is basically unchanged compared with that of the metal organic frame nano enzyme before chelation, so that the interference of the influence of the size on the catalytic activity is eliminated, and the real contribution of the side chain ligand to the catalytic activity of the metal organic frame nano enzyme is studied.
FIGS. 9-11 show the enzymatic kinetics of Zr-TCPP (Fe) -H MOF, zr-TCPP (Ir) -NO 2 MOF with H 2O2 as substrate. FIG. 12 shows the enzymatic performance comparisons of Zr-TCPP (Fe) -H MOF, zr-TCPP (Ir) -NO 2 MOF. It can be seen that compared with Zr-TCPP (Fe) -H MOF with a structure similar to heme of horseradish peroxidase, the obtained Zr-TCPP (Ir) -NO 2 MOF has remarkable improvement on catalytic efficiency by introducing 2-nitroterephthalic acid and iridium chloride of electron-withdrawing ligand, and the remarkable promotion effect of pore wall engineering and metal sites on the catalytic activity of zirconium porphyrin metallo-organic framework nano-enzyme is proved.
The present invention is not limited to the above embodiments, but is merely preferred embodiments of the present invention, and the present invention should be considered as being within the scope of the present invention as long as the technical effects of the present invention are achieved by the same or equivalent means. Various modifications and variations are possible in the technical solution and/or in the embodiments within the scope of the invention.

Claims (7)

1. The preparation method of the zirconium porphyrin metal organic framework nano-enzyme is characterized by comprising the following steps of:
Mixing MESO-tetra (4-carboxyphenyl) porphin, zirconium tetrachloride, aryl dicarboxylic acid and a morphology regulator in a first solvent, reacting at 120-140 ℃, washing and separating precipitate to obtain a zirconium porphyrin metal organic framework material;
dispersing the zirconium porphyrin metal organic frame material in a second solvent, adding a metal precursor solution, reacting at 80-90 ℃, washing and separating precipitate to obtain zirconium porphyrin metal organic frame nano-enzyme;
wherein the aryl dicarboxylic acid is 2-nitroterephthalic acid, and the metal precursor solution is iridium chloride aqueous solution.
2. The method of claim 1, wherein the morphology modifier is at least one of benzoic acid, formic acid.
3. The method of claim 1, wherein the molar ratio of MESO-tetrakis (4-carboxyphenyl) porphine, zirconium tetrachloride, aryl dicarboxylic acid, and metal precursor solution is (1-3): (18-20): (13-15): (1-2).
4. The method of claim 1, wherein the first solvent is N, N-dimethylformamide.
5. The method of claim 1, wherein the second solvent is ethanol.
6. A zirconium porphyrin metal organic framework nano-enzyme, characterized in that the zirconium porphyrin metal organic framework nano-enzyme is obtained by the preparation method of the zirconium porphyrin metal organic framework nano-enzyme according to any one of claims 1 to 5.
7. The use of the zirconium porphyrin metal organic framework nano-enzyme according to claim 6 for preparing a medicament or an auxiliary material for resisting bacterial infection or preventing and treating a biological film.
CN202410615026.0A 2024-05-17 2024-05-17 Zirconium porphyrin metal organic framework nano-enzyme and preparation method and application thereof Active CN118185052B (en)

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