阅读说明：本技术 一种含有邻苯二酚、氨基和羧基的两种磷酰胆碱涂层的制备方法 (Preparation method of two phosphorylcholine coatings containing catechol, amino and carboxyl ) 是由 张亚刚 周安宁 张亚婷 贺新福 杨志远 李文英 于 2020-07-21 设计创作，主要内容包括：本发明公开了一种含有邻苯二酚、氨基和羧基的两种磷酰胆碱涂层的制备方法,该方法：通过自由基聚合反应得到含有氨基的磷酰胆碱聚合物、含有羧基的磷酰胆碱聚合物；然后将3,4-二羟基苯甲醛接枝到含有氨基的磷酰胆碱聚合物上,经过还原制备得到含有邻苯二酚、氨基的磷酰胆碱聚合物；将含有羧基的磷酰胆碱聚合物和含有邻苯二酚、氨基的磷酰胆碱聚合物溶于极性溶剂得到仿生涂料；将涂料涂覆于需要改性的材料表面,经晾干、热处理、洗涤实现对材料的表面改性。本发明方法操作简便、实用性强、适用面广,制备所得的仿生涂层具有良好的生物相容性及稳定性。本发明方法适用于血液净化、体内植入材料、组织工程、药物缓释及生物传感器等领域。(The invention discloses a preparation method of two phosphorylcholine coatings containing catechol, amino and carboxyl, which comprises the following steps: obtaining a phosphorylcholine polymer containing amino and a phosphorylcholine polymer containing carboxyl through free radical polymerization; then grafting 3, 4-dihydroxy benzaldehyde on a phosphorylcholine polymer containing amino, and reducing to prepare the phosphorylcholine polymer containing catechol and amino; dissolving a phosphorylcholine polymer containing carboxyl and a phosphorylcholine polymer containing catechol and amino in a polar solvent to obtain a bionic coating; the coating is coated on the surface of a material to be modified, and the surface modification of the material is realized through airing, heat treatment and washing. The method has the advantages of simple and convenient operation, strong practicability and wide application range, and the prepared bionic coating has good biocompatibility and stability. The method is suitable for the fields of blood purification, in-vivo implanted materials, tissue engineering, drug sustained release, biosensors and the like.)

1. A preparation method of two phosphorylcholine coatings containing catechol, amino and carboxyl is characterized by comprising the following steps in sequence:

s1, reacting the vinyl monomer containing the phosphorylcholine hydrophilic group with the vinyl monomer containing the amino group and the vinyl monomer containing the carboxyl group respectively to prepare a phosphorylcholine polymer containing the amino group and a phosphorylcholine polymer containing the carboxyl group;

s2, grafting 3, 4-dihydroxy benzaldehyde onto a phosphorylcholine polymer containing amino through Schiff base reaction, and synthesizing the phosphorylcholine polymer containing catechol and amino through reduction;

s3, dissolving a phosphorylcholine polymer containing catechol, an amino phosphorylcholine polymer and a carboxyl group in a polar solvent to prepare the bionic coating containing the phosphorylcholine polymer;

s4, coating the bionic coating containing the phosphorylcholine polymer on the surface of a material to be modified, airing, placing in a Tris-HCl solution for heating treatment, and washing to prepare the bionic coating with the structure of the simulated extracellular membrane on the surface of the material to be modified.

2. The method for preparing two phosphorylcholine coatings containing catechol, amino group and carboxyl group according to claim 1, wherein in step S1, the molar ratio of the vinyl monomer containing phosphorylcholine hydrophilic group to the vinyl monomer containing amino group is 3: 7-9: 1; the mol ratio of the vinyl monomer containing the phosphorylcholine hydrophilic group to the vinyl monomer containing the carboxyl group is 3: 7-9: 1.

3. The method for preparing two phosphorylcholine coatings containing catechol, amino and carboxyl according to claim 2, wherein in step S1, the preparation process of the phosphorylcholine polymer containing amino and the phosphorylcholine polymer containing carboxyl uses a mixed solvent of ethanol and tetrahydrofuran, the initiator is azobisisobutyronitrile, the reaction temperature is 65-80 ℃, the reaction time is 20-26 h, and the separation and purification are performed by using a dialysis bag with the molecular weight cutoff of 6000-8000.

4. The method for preparing two phosphorylcholine coatings containing catechol, amino group and carboxyl group according to claim 3, wherein the vinyl monomer containing phosphorylcholine hydrophilic group is methacryloyloxyethyl phosphorylcholine monomer, the vinyl monomer containing amino group is 2-aminoethyl methacrylate monomer, and the vinyl monomer containing carboxyl group is methacrylic acid monomer.

5. The method for preparing two phosphorylcholine coatings containing catechol, amino group and carboxyl group according to claim 4, wherein the preparation method of the phosphorylcholine polymer containing catechol and amino group in step S2 is as follows: dissolving a phosphorylcholine polymer containing amino into methanol to obtain a polymer solution, adding the polymer solution into a reactor under the conditions of an inert gas atmosphere, a temperature of 35-45 ℃ and stirring, preheating, adding 3, 4-dihydroxybenzaldehyde, stirring for reaction for 10-15 hours, adding a reducing agent for reduction, concentrating a reaction solution after the reaction is finished, dialyzing the reaction solution in a hydrochloric acid aqueous solution with the pH value of 3-4 by using a dialysis bag with the molecular weight cutoff of 6000-8000, and freeze-drying a dialyzed sample at-50 ℃ to obtain the phosphorylcholine-containing water-based composite material.

6. The method for preparing two phosphorylcholine coatings containing catechol, amino group and carboxyl group according to claim 5, wherein in step S2, the mass ratio of the phosphorylcholine polymer containing amino group to 3, 4-dihydroxybenzaldehyde is 1: 1-4: 1.

7. The method for preparing two phosphorylcholine coatings containing catechol, amino group and carboxyl group according to claim 6, wherein in step S2, the molar ratio of the reducing agent to 3, 4-dihydroxybenzaldehyde is 3: 1-8: 1.

8. The method for preparing the two phosphorylcholine coatings containing catechol, amino group and carboxyl group according to claim 7, wherein in step S3, the polar solvent is methanol or ethanol, and the mass ratio of the polymer containing catechol, amino phosphorylcholine and the polymer containing carboxyl group is 20: 7-140: 1.

9. According to claim8, the preparation method of the two phosphorylcholine coatings containing catechol, amino and carboxyl is characterized in that in the step S4, the volume of the phosphorylcholine-containing polymer bionic coating coated on the surface of the material is 5-11 mu L/cm²。

10. The method for preparing the two phosphorylcholine coatings containing catechol, amino group and carboxyl group according to claim 9, wherein the modified material coated with the coating is treated in Tris-HCl solution with pH = 8-9 at 50-80 ℃ for 6-12 h in step S4.

Technical Field

The invention belongs to the technical field of material surface science and biomedical high polymer materials, and particularly relates to a preparation method of two phosphorylcholine coatings containing catechol, amino and carboxyl.

Background

Improving the biocompatibility of biomedical polymer materials is a key research point in the development of biomaterials. Introducing a substance with good biocompatibility to the surface of the material is a simple and effective way for improving the interaction between the material and organisms and improving the biocompatibility of the material.

Phosphorylcholine (PC) is a hydrophilic terminal group of lecithin which is a basic unit of a cell membrane, is an outer layer functional group in an outer layer membrane of a cell, simultaneously has positive and negative dissimilar charges, and can form a very firm hydration layer with water molecules. The property ensures that biological components such as protein, liposome and the like are not easily adsorbed and deposited on the surface of the material rich in phosphorylcholine groups, and the material shows good biocompatibility.

In recent years, introduction of a polymer containing phosphorylcholine groups onto a material surface by grafting, coating or the like has been studied to improve biocompatibility of the material. However, researches find that the grafting density of the surface phosphorylcholine group in the grafting method is limited, and the sufficient phosphorylcholine group density and the satisfactory use performance are difficult to achieve; the simple physical coating layer of the coating method is easy to dissolve, degrade and even fall off in a complex physiological environment.

Aiming at the problem of poor coating stability of a coating method, Lewis and Xubuping and the like (Biomaterials 2001,22:99-111; Biomaterials 2004,25:3099-3108 European Polymer Journal 2004,40:291-298) respectively research Polymer coatings containing trimethoxy silicon groups and phosphorylcholine groups, and the result shows that cross-linking among polymers and reaction of the cross-linking and substrate surface functional groups are key factors for improving the stability of the phosphorylcholine Polymer coatings, but cross-linkable groups of the polymers are easy to hydrolyze and cross-link in the synthesis process, so that the synthesis process conditions are harsh, difficult to store and limited in use. In addition, research is carried out on grafting the dopamine adhered to the mussel onto the phosphorylcholine polymer containing carboxyl, and then coating the dopamine on the surface of the titanium alloy for surface modification. Therefore, the research and development of a surface modification method which is simple and convenient to operate, strong in practicability and wide in application range are urgently needed, and the prepared bionic coating has good biocompatibility and stability.

Disclosure of Invention

In order to solve the defects in the prior art, the invention aims to provide a preparation method of two phosphorylcholine coatings containing catechol, amino and carboxyl, the method is simple and convenient to operate, strong in practicability and wide in application range, and the bionic coating prepared by the method has good biocompatibility and stability.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows:

a preparation method of two phosphorylcholine coatings containing catechol, amino and carboxyl comprises the following steps in sequence:

s1, reacting the vinyl monomer containing the phosphorylcholine hydrophilic group with the vinyl monomer containing the amino group and the vinyl monomer containing the carboxyl group respectively to prepare a phosphorylcholine polymer containing the amino group and a phosphorylcholine polymer containing the carboxyl group;

s2, grafting 3, 4-dihydroxy benzaldehyde onto a phosphorylcholine polymer containing amino through Schiff base reaction, and synthesizing the phosphorylcholine polymer containing catechol and amino through reduction;

s3, dissolving a phosphorylcholine polymer containing catechol, an amino phosphorylcholine polymer and a carboxyl group in a polar solvent to prepare the bionic coating containing the phosphorylcholine polymer;

s4, coating the bionic coating containing the phosphorylcholine polymer on the surface of a material to be modified, airing, placing in a Tris-HCl solution for heating treatment, and washing to prepare the bionic coating with the structure of the simulated extracellular membrane on the surface of the material to be modified.

As a limitation of the present invention:

in the step S1, the mol ratio of the vinyl monomer containing the phosphorylcholine hydrophilic group to the vinyl monomer containing the amino group is 3: 7-9: 1; the mol ratio of the vinyl monomer containing the phosphorylcholine hydrophilic group to the vinyl monomer containing the carboxyl group is 3: 7-9: 1.

As a further limitation of the invention:

in the step S1, in the preparation process of the phosphorylcholine polymer containing amino and the phosphorylcholine polymer containing carboxyl, the used solvent is a mixed solvent of ethanol and tetrahydrofuran, the initiator is azobisisobutyronitrile, the reaction temperature is 65-80 ℃, the reaction time is 20-26 h, and the separation and purification are carried out by using a dialysis bag with the molecular weight cutoff of 6000-8000.

As still further limitations of the present invention:

the vinyl monomer containing the phosphorylcholine hydrophilic group is a methacryloyloxyethyl phosphorylcholine monomer, the vinyl monomer containing amino is a 2-aminoethyl methacrylate monomer, and the vinyl monomer containing carboxyl is a methacrylic acid monomer.

As a further limitation of the invention:

in step S2, the preparation method of the phosphorylcholine polymer containing catechol and amino groups comprises: dissolving a phosphorylcholine polymer containing amino into methanol to obtain a polymer solution, adding the polymer solution into a reactor under the conditions of an inert gas atmosphere, a temperature of 35-45 ℃ and stirring, preheating, adding 3, 4-dihydroxybenzaldehyde, stirring for reaction for 10-15 hours, adding a reducing agent for reduction, concentrating a reaction solution after the reaction is finished, dialyzing the reaction solution in a hydrochloric acid aqueous solution with the pH value of 3-4 by using a dialysis bag with the molecular weight cutoff of 6000-8000, and freeze-drying a dialyzed sample at-50 ℃ to obtain the phosphorylcholine-containing water-based composite material.

As a further limitation of the invention:

in step S2, the mass ratio of the phosphorylcholine polymer containing amino groups to the 3, 4-dihydroxybenzaldehyde is 1: 1-4: 1.

As a further limitation of the invention:

in step S2, the molar ratio of the reducing agent to the 3, 4-dihydroxybenzaldehyde is 3:1 to 8: 1.

As a further limitation of the invention:

in the step S3, the polar solvent is methanol or ethanol, and the mass ratio of the polymer containing catechol, the polymer containing aminophosphorylcholine and the polymer containing carboxyl is 20: 7-140: 1.

As a further limitation of the invention:

in the step S4, the volume of the phosphorylcholine-containing polymer bionic coating coated on the surface of the material is 5-11 mu L/cm²。

As still further limitations of the present invention:

in step S4, the modified material coated with the coating is placed in a Tris-HCl solution with the pH = 8-9 and treated at 50-80 ℃ for 6-12 h.

Due to the adoption of the technical scheme, compared with the prior art, the invention has the following beneficial effects:

(1) the phosphorylcholine polymer containing catechol, amino phosphorylcholine and carboxyl prepared by the invention has a simulated cell outer layer membrane structure of phosphorylcholine groups, so that the biocompatibility and the stain resistance of the surface of the medical biomaterial can be greatly improved;

(2) the coating is fixed on the surface of the medical biomaterial by means of the adhesion effect of catechol biomimetic mussel adhesive protein dopamine and the electrostatic interaction of amino and carboxyl in the polymer, so that the coating is stably fixed on the surface of the medical biomaterial;

(3) the method for modifying the surface of the medical biomaterial has the advantages of simple and convenient operation, strong practicability and wide application range, and provides a new way for modifying the surface of the medical biomaterial;

(4) the surface of the modified medical biomaterial prepared by the method has wide application prospect in the fields of blood purification, in-vivo implanted materials, tissue engineering, drug sustained release, biosensors and the like.

In conclusion, the bionic coating with the simulated cell outer membrane structure is prepared to improve the biocompatibility of the surface of the medical biomaterial, and meanwhile, the stability of the bionic coating is effectively improved by means of the synergistic effect of the simulated mussel adhesion and the electrostatic interaction.

The method is suitable for the fields of blood purification, in-vivo implanted materials, tissue engineering, drug sustained release, biosensors and the like.

Drawings

The invention is described in further detail below with reference to the figures and the embodiments.

FIG. 1 is a graph showing dynamic contact angles of a polycarbonate before modification and a polycarbonate after modification in example 1 of the present invention;

FIG. 2 is a surface fine element energy spectrum of a polycarbonate before modification and a polycarbonate after modification in example 1 of the present invention.

Detailed Description

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the description of the preferred embodiment is only for purposes of illustration and understanding, and is not intended to limit the invention.