CN112972766A - Silk fibroin-hydroxyapatite composite bone scaffold with high mechanical strength and preparation method thereof - Google Patents
Silk fibroin-hydroxyapatite composite bone scaffold with high mechanical strength and preparation method thereof Download PDFInfo
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- 239000002131 composite material Substances 0.000 title claims abstract description 65
- 229910052588 hydroxylapatite Inorganic materials 0.000 title claims abstract description 58
- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- 108010022355 Fibroins Proteins 0.000 claims abstract description 58
- XYJRXVWERLGGKC-UHFFFAOYSA-D pentacalcium;hydroxide;triphosphate Chemical compound [OH-].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O XYJRXVWERLGGKC-UHFFFAOYSA-D 0.000 claims abstract description 46
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- 238000000034 method Methods 0.000 claims abstract description 20
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- AMXOYNBUYSYVKV-UHFFFAOYSA-M lithium bromide Chemical compound [Li+].[Br-] AMXOYNBUYSYVKV-UHFFFAOYSA-M 0.000 claims description 16
- 238000004108 freeze drying Methods 0.000 claims description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- 241000255789 Bombyx mori Species 0.000 claims description 8
- 238000002156 mixing Methods 0.000 claims description 8
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- 230000008014 freezing Effects 0.000 claims description 5
- 229910000030 sodium bicarbonate Inorganic materials 0.000 claims description 5
- UIIMBOGNXHQVGW-UHFFFAOYSA-M sodium bicarbonate Substances [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 claims description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 4
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- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L27/00—Materials for grafts or prostheses or for coating grafts or prostheses
- A61L27/14—Macromolecular materials
- A61L27/22—Polypeptides or derivatives thereof, e.g. degradation products
- A61L27/227—Other specific proteins or polypeptides not covered by A61L27/222, A61L27/225 or A61L27/24
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- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L27/00—Materials for grafts or prostheses or for coating grafts or prostheses
- A61L27/02—Inorganic materials
- A61L27/12—Phosphorus-containing materials, e.g. apatite
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L27/00—Materials for grafts or prostheses or for coating grafts or prostheses
- A61L27/50—Materials characterised by their function or physical properties, e.g. injectable or lubricating compositions, shape-memory materials, surface modified materials
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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- A61L2430/00—Materials or treatment for tissue regeneration
- A61L2430/02—Materials or treatment for tissue regeneration for reconstruction of bones; weight-bearing implants
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Abstract
本发明涉及一种高机械强度丝素蛋白‑羟基磷灰石复合骨支架及其制备方法。本发明将丝素蛋白溶液和羟基磷灰石水分散液通过超声作用形成混合溶液，通过直流定向电场诱导的方法，快速无毒的制备具有高机械强度的丝素蛋白/羟基磷灰石复合三维多孔支架，该方法制备周期短且操作简单，最终得到的支架具有优异并且可调节的力学性能，能够达到天然松质骨的机械性能要求，可以满足临床上的应用，是一种有效的新策略。
The invention relates to a high mechanical strength silk fibroin-hydroxyapatite composite bone scaffold and a preparation method thereof. In the invention, the silk fibroin solution and the hydroxyapatite aqueous dispersion are formed into a mixed solution by ultrasonic action, and the silk fibroin/hydroxyapatite composite three-dimensional complex with high mechanical strength is prepared rapidly and non-toxic by the method of direct current directional electric field induction. Porous scaffold, this method has short preparation period and simple operation, the final scaffold has excellent and adjustable mechanical properties, can meet the mechanical properties requirements of natural cancellous bone, can meet the clinical application, is an effective new strategy .
Description
Technical Field
The invention relates to the technical field of medical materials, in particular to a silk fibroin-hydroxyapatite composite bone scaffold with high mechanical strength and a preparation method thereof.
Background
Bone is the second commonly transplanted tissue worldwide, at least four million surgeries are performed each year, and bone defects bring great inconvenience to human body and life. Although bone has a certain ability to regenerate, in most cases, it is still necessary to improve the ability of bone to repair. Clinically, for the treatment of bone defects, autologous bone graft or allogeneic bone is commonly used, but there are problems of immune resistance, limited sources, and the like. In view of this, research has been made on bone tissue engineering scaffold materials that can mimic the structure and properties of natural bone. In recent years, people pay more and more attention to natural polymers due to better biocompatibility, multiple functionalities and the like, and silk fibroin is proved to have certain bone repair performance as a natural polymer with various advantages of biocompatibility, easiness in processing and molding, lower cost and the like.
Fibroin is a natural polymer material derived from silk, and is increasingly researched and applied in the field of bone tissue engineering. At present, compared with natural bone, the porous scaffold prepared from regenerated silk fibroin has poorer mechanical property and osteogenic property, and hydroxyapatite particles can be added to improve the defect so as to more effectively simulate the natural bone structure. Hydroxyapatite is a bioactive ceramic with a chemical composition and crystalline structure similar to the main constituent of inorganic substances in the human bone matrix. The previous research shows that the artificially synthesized hydroxyapatite has the same composition and similar structure as the hydroxyapatite in human skeleton, has no adverse reaction when implanted into human body, has good biocompatibility, and simultaneously shows certain osteogenic inductivity and osteoconductivity. Therefore, the scaffold with excellent mechanical property and bone repair property can be prepared by taking silk fibroin as a matrix and doping hydroxyapatite particles.
At present, the fibroin/hydroxyapatite composite bone scaffold is prepared mainly by two methods, namely, directly mechanically mixing fibroin and hydroxyapatite, and then preparing the composite bone scaffold by methods such as particle filtration, foaming, direct freeze drying and the like, and preparing a pure fibroin protein scaffold and introducing the hydroxyapatite by a biomimetic mineralization method. The preparation methods have multiple operation steps, and the obtained composite bone scaffold has poor mechanical properties and is not favorable for clinical use.
Disclosure of Invention
In order to solve the technical problems, the fibroin/hydroxyapatite composite bone scaffold is rapidly and nontoxically prepared by a direct current directional electric field induction method, the preparation period is short, the operation is simple, and the finally obtained scaffold has excellent and adjustable mechanical properties.
The invention aims to provide a preparation method of a silk fibroin-hydroxyapatite composite bone scaffold with high mechanical strength, which comprises the following steps:
s1, dispersing hydroxyapatite in water through ultrasonic action, adding a silk fibroin solution into the uniformly dispersed hydroxyapatite aqueous solution according to the mass ratio of the silk fibroin to the hydroxyapatite of 10: 0.5-5, and uniformly mixing by ultrasonic to obtain a silk fibroin/hydroxyapatite solution;
s2, inserting the two graphite plates into the silk fibroin/hydroxyapatite solution, respectively connecting the two graphite plates with the positive and negative electrodes of a direct-current power supply, performing directional electric field induction on the silk fibroin/hydroxyapatite solution to enable self-assembled nanoparticles in the silk fibroin solution to be aggregated into microparticles near the positive electrode plate, and wrapping hydroxyapatite in the microparticles to obtain the silk fibroin/hydroxyapatite composite gel;
s3, precooling the fibroin/hydroxyapatite composite gel, and freeze-drying to obtain the fibroin-hydroxyapatite composite bone scaffold.
Further, the directional electric field induction effect is to treat for 10-40 min under the voltage of 20-30V.
Further, the concentration of the silk fibroin solution is 5-10 wt%.
Further, the fibroin solution is prepared by the following method: degumming silkworm cocoons, washing with water, drying, dissolving in LiBr solution, filtering, dialyzing, and centrifuging to obtain fibroin solution.
Further, the degumming treatment is to place the silkworm cocoons into NaHCO with the weight of 0.1-1% w/v3Boiling the solution for 30-60 min.
Further, the concentration of the LiBr solution is 9-10 mol/L.
Further, the precooling is carried out for 10-20 h at the temperature of-10 to-30 ℃.
Further, the freeze drying is to freeze for 1-5 h at-80 ℃ and then freeze-dry by a freeze dryer.
The second purpose of the invention is to provide the silk fibroin-hydroxyapatite composite bone scaffold prepared by the method.
The third purpose of the invention is to provide the application of the silk fibroin-hydroxyapatite composite bone scaffold in the preparation of artificial bones.
By the scheme, the invention at least has the following advantages:
the method disclosed by the invention is simple to operate, short in preparation period, environment-friendly, safe and pollution-free, and the prepared fibroin/hydroxyapatite composite bone scaffold is excellent in mechanical property and can meet the clinical use requirements.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood and to implement them in accordance with the contents of the description, the following description is made with reference to the preferred embodiments of the present invention and the accompanying detailed drawings.
Drawings
FIG. 1 is a schematic view of a fibroin/hydroxyapatite composite bone scaffold prepared under the action of an electric field;
FIG. 2 is an electron microscope image of two composite bone scaffolds;
FIG. 3 is an infrared representation of two composite bone scaffolds;
FIG. 4 is an XRD representation of two composite bone scaffolds;
FIG. 5 is a graph comparing the mechanical properties of two composite bone scaffolds;
fig. 6 is a graph comparing the mechanical properties of the electric field composite bone scaffold with a pine bone and silk fibroin/hydroxyapatite composite bone scaffold in the reference.
Detailed Description
The following examples are given to further illustrate the embodiments of the present invention. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
The method for testing the compression mechanical property of the composite bone scaffold comprises the following steps:
the stent was prepared in a cylindrical shape having dimensions of 10mm (diameter) × 8mm (height) with a polytetrafluoroethylene mold, and the sample was subjected to compression mechanical property test using a texture analyzer (TMS-PRO). The test speed was set at 10mm/min, the trigger force was 0.03N, the compression ratio was 80%, and three samples were tested per group.
Example 1:
according to the schematic diagram of fig. 1, a composite bone scaffold is prepared:
1. shearing silkworm cocoon into about 1cm2The cocoon sheets are prepared by weighing a certain amount of cocoon sheets and putting the cocoon sheets into a container containing 0.5% w/v NaHCO3Boiling the solution for 45min, washing the degummed silk with warm deionized water for 4-5 times, drying, dissolving the silk in 9.3mol/L LiBr solution, and dissolving for 1h at 60 ℃. Filtering, dialyzing, and centrifuging to obtain silk fibroin solution with final concentration of about 9 wt%.
2. Fibroin according to mass fraction: dispersing hydroxyapatite in certain water in a ratio of 10:2, adding fibroin, and ultrasonically mixing the two uniformly.
3. And (3) carrying out direct current directional electric field induction treatment (about 20-30 min) on the fibroin/hydroxyapatite solution under the voltage of 25V.
4. Taking out the fibroin/hydroxyapatite composite gel, standing at-20 deg.C overnight, freezing at-80 deg.C for 4 hr, and freeze-drying in a freeze-drying machine.
5. And taking out the freeze-dried scaffold to obtain the composite bone scaffold.
Example 2:
1. shearing silkworm cocoon into about 1cm2The cocoon sheets are prepared by weighing a certain amount of cocoon sheets and putting the cocoon sheets into a container containing 0.5% w/v NaHCO3Boiling the solution for 45min, washing the degummed silk with warm deionized water for 4-5 times, drying, dissolving the silk in 9.3mol/L LiBr solution, and dissolving for 1h at 60 ℃. Filtering, dialyzing, and centrifuging to obtain silk fibroin solution with final concentration of about 9 wt%.
2. Fibroin according to mass fraction: dispersing hydroxyapatite in certain water in a ratio of 10:1, adding fibroin, and ultrasonically mixing the two uniformly.
3. And (3) carrying out direct current directional electric field induction treatment (about 30-40 min) on the fibroin/hydroxyapatite solution under the voltage of 20V.
4. Taking out the fibroin/hydroxyapatite composite gel, standing at-20 deg.C overnight, freezing at-80 deg.C for 4 hr, and freeze-drying in a freeze-drying machine.
5. And taking out the freeze-dried scaffold to obtain the composite bone scaffold.
Example 3:
1. shearing silkworm cocoon into about 1cm2The cocoon sheets are prepared by weighing a certain amount of cocoon sheets and putting the cocoon sheets into a container containing 0.5% w/v NaHCO3Boiling the solution for 45min, washing the degummed silk with warm deionized water for 4-5 times, drying, dissolving the silk in 9.3mol/L LiBr solution, and dissolving for 1h at 60 ℃. Filtering, dialyzing, and centrifuging to obtain silk fibroin solution with final concentration of about 9 wt%.
2. Fibroin according to mass fraction: dispersing hydroxyapatite in certain water in a ratio of 10:3, adding fibroin, and ultrasonically mixing the two uniformly.
3. And (3) carrying out direct current directional electric field induction treatment (about 30-40 min) on the fibroin/hydroxyapatite solution under the voltage of 30V.
4. Taking out the fibroin/hydroxyapatite composite gel, standing at-20 deg.C overnight, freezing at-80 deg.C for 4 hr, and freeze-drying in a freeze-drying machine.
5. And taking out the freeze-dried scaffold to obtain the composite bone scaffold.
Comparative example 1:
1. shearing silkworm cocoon into about 1cm2The cocoon sheets are prepared by weighing a certain amount of cocoon sheets and putting the cocoon sheets into a container containing 0.5% w/v NaHCO3Boiling the solution for 45min, washing the degummed silk with warm deionized water for 4-5 times, drying, dissolving the silk in 9.3mol/L LiBr solution, and dissolving for 1h at 60 ℃. Filtering, dialyzing, and centrifuging to obtain silk fibroin solution with final concentration of about 9 wt%.
2. Fibroin according to mass fraction: firstly dispersing hydroxyapatite in a certain butanol solution, ultrasonically mixing uniformly, dropwise adding the mixture into a fibroin solution, and simultaneously mixing the solution uniformly.
3. And (3) putting the mixed solution at-20 ℃ overnight, freezing at-80 ℃ for 4h, and putting the frozen solution into a freeze dryer for freeze drying.
4. And taking out the freeze-dried scaffold to obtain the composite bone scaffold.
The composite bone scaffolds obtained in example 1 and comparative example 1 were compared in terms of performance, and the results were as follows:
fig. 2 is an electron micrograph of two composite bone scaffolds, showing that: the two kinds of composite bone scaffolds both present porous structures, and the butanol composite bone scaffold has uniform pore diameter and size of 50-100 μm. The aperture of the electric field composite bone scaffold is mostly concentrated in 0-50 μm, and some 200-300 μm macropores appear at the same time, thus showing a multi-stage porous structure.
Fig. 3 is an infrared characterization of two composite bone scaffolds, showing the results: the FTIR absorption peak of butanol composite bone scaffold material amide I mainly appears at 1621cm-1Here, it is shown that silk fibroin in butanol composite bone scaffold material is mainly beta-folded, and FTIR absorption peak of electric field composite bone scaffold material amide I mainly appears at 1637cm-1And (3) showing that the silk fibroin in the electric field composite bone scaffold material is mainly randomly coiled. The two kinds of composite bone supports are all 1030cm-1，600cm-1，560cm-1Has an absorption peak, which is related to PO in hydroxyapatite4 3-The groups are corresponding, which indicates that the hydroxyapatite is successfully compounded in the silk fibroin bracket.
Fig. 4 is an XRD characterization of two composite bone scaffolds, showing that: characteristic peaks appear at 26 degrees, 31.7 degrees, 33 degrees and 34 degrees of the composite bone scaffold prepared by two different methods, and respectively correspond to (002), (211), (300) and (202) crystal faces of hydroxyapatite. The results and infrared show that the silk fibroin/hydroxyapatite composite bone scaffold is successfully prepared by both methods.
Fig. 5 is a graph comparing the mechanical properties of two composite bone scaffolds, and the results show that: compared with the butanol composite bone scaffold, the compressive strength of the electric field composite bone scaffold is greatly improved.
Table 1 shows the maximum compressive strength and modulus of elasticity for two composite bone scaffolds, and the results show: compared with the butanol composite bone scaffold, the maximum compression strength and the elastic modulus of the electric field composite bone scaffold are greatly improved and respectively reach 14 times and 21 times of those of the butanol composite bone scaffold.
TABLE 1
| Sample (I) | Maximum compressive strength (MPa) | Modulus of elasticity (MPa) |
| Butanol composite bone scaffold | 1.75±0.18 | 1.35±0.17 |
| Electric field composite bone support | 24.66±0.88 | 28.91±3.19 |
Fig. 6 is a graph comparing the mechanical properties of electric field composite bone scaffolds with pine bone and some of the silk fibroin/hydroxyapatite composite bone scaffolds in the references, and the results show that: the mechanical property of the electric field composite bone scaffold is greatly improved compared with that of most references, and the mechanical property requirement of natural cancellous bone is met, so that the electric field composite bone scaffold can meet the clinical application and is an effective new strategy.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, it should be noted that, for those skilled in the art, many modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A preparation method of a silk fibroin-hydroxyapatite composite bone scaffold with high mechanical strength is characterized by comprising the following steps:
s1, dispersing hydroxyapatite in water through ultrasonic action, adding a silk fibroin solution into the uniformly dispersed hydroxyapatite aqueous solution according to the mass ratio of the silk fibroin to the hydroxyapatite of 10: 0.5-5, and uniformly mixing by ultrasonic to obtain a silk fibroin/hydroxyapatite solution;
s2, inserting the two graphite plates into the fibroin/hydroxyapatite solution, respectively connecting the graphite plates with the positive and negative electrodes of a direct-current power supply, performing directional electric field induction on the fibroin/hydroxyapatite solution to enable self-assembled nanoparticles in the fibroin solution to be aggregated into microparticles near the positive electrode plate, and wrapping hydroxyapatite in the microparticles to obtain fibroin/hydroxyapatite composite gel;
s3, precooling the fibroin/hydroxyapatite composite gel, and freeze-drying to obtain the fibroin-hydroxyapatite composite bone scaffold.
2. The method of claim 1, wherein the directional electric field induction is performed at a DC stabilization voltage of 20-30V for 10-40 min.
3. The method as claimed in claim 1, wherein the concentration of the silk fibroin solution is 5 to 10 wt%.
4. A method as claimed in claim 3, wherein the fibroin solution is prepared by: degumming silkworm cocoons, washing with water, drying, dissolving in LiBr solution, filtering, dialyzing, and centrifuging to obtain fibroin solution.
5. The method of claim 4, wherein the degumming treatment comprises placing the silkworm cocoons in a concentration of 0.1-1% w/v NaHCO3Boiling the solution for 30-60 min.
6. The method according to claim 4, wherein the concentration of the LiBr solution is 9-10 mol/L.
7. The method according to claim 1, wherein the pre-cooling is performed at-10 to-30 ℃ for 10 to 20 hours.
8. The method according to claim 1, wherein the freeze-drying is freeze-drying by a freeze-dryer after freezing at-80 ℃ for 1-5 h.
9. The silk fibroin-hydroxyapatite composite bone scaffold prepared by the method of any one of claims 1 to 8.
10. Use of the silk fibroin-hydroxyapatite composite bone scaffold of claim 9 for the preparation of an artificial bone.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116173310A (en) * | 2023-02-24 | 2023-05-30 | 苏州大学 | A polymer/hydroxyapatite composite scaffold with highly ordered interconnected porous structure and its preparation method and application |
| WO2023134090A1 (en) * | 2022-01-13 | 2023-07-20 | Shenzhen Institute Of Advanced Technology | Use of a neuropeptide in treating bone-injury disease |
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| US20110171239A1 (en) * | 2008-09-26 | 2011-07-14 | Trustees Of Tufts College | pH INDUCED SILK GELS AND USES THEREOF |
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| WO2023134090A1 (en) * | 2022-01-13 | 2023-07-20 | Shenzhen Institute Of Advanced Technology | Use of a neuropeptide in treating bone-injury disease |
| CN116173310A (en) * | 2023-02-24 | 2023-05-30 | 苏州大学 | A polymer/hydroxyapatite composite scaffold with highly ordered interconnected porous structure and its preparation method and application |
| CN116173310B (en) * | 2023-02-24 | 2024-12-24 | 苏州大学 | A polymer/hydroxyapatite composite scaffold with highly ordered interconnected porous structure and its preparation method and application |
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