CN1193803C - Method for preparing porous chitosan tube - Google Patents
Method for preparing porous chitosan tube Download PDFInfo
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- CN1193803C CN1193803C CNB021490864A CN02149086A CN1193803C CN 1193803 C CN1193803 C CN 1193803C CN B021490864 A CNB021490864 A CN B021490864A CN 02149086 A CN02149086 A CN 02149086A CN 1193803 C CN1193803 C CN 1193803C
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- chitosan
- pipe
- solution
- mould
- conduit
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Abstract
The present invention discloses a method for preparing a porous chitosan tube, which belongs to the field of biological medical material. The method takes chitosan, acetic acid and sodium hydroxide as raw materials, acetic acid solution of the chitosan is added in a mould first, and then, a core mould is inserted in the mould. Freeze-drying and forming are carried out, and the chitosan tube of which the length is more than 150mm is obtained after demoulding. An improved freeze-drying process is adopted, and the porous chitosan tube of which the wall thickness is from 0.2 to 1mm, the inner diameter is from 0.5 to 8mm, the average pore size is from 0.02 to 0.1mm, the porosity is from 20% to 90% and the length is 150mm is prepared. Simultaneously, a half-through porous tube whose outer wall or inner wall has no pore can be made. The porous chitosan tube prepared by the method has certain elasticity and strength, and biodegradation, the metabolite of the porous chitosan tube has no toxic or side effect on a human body, and the chitosan tube can be used as a tissue repairing material or a tissue engineering scaffold material.
Description
Technical field
The invention belongs to the bio-medical material manufacture field, particularly a kind of preparation method of porous chitosan pipe.
Background technology
Chitosan is a kind of natural polysaccharide, and good biocompatibility is biodegradable, is widely used in biomedical sector.Chitosan does not have fusing point, and intensification can only carbonization and can not be softened or fuse, so can't be processed into pipe by methods such as extrusion molding, casting.Main at present employing rotary evaporation legal system is equipped with chitosan conduit, but this method wastes time and energy the pipe atresia of preparation and inhomogeneous.Chinese patent publication number CN1262961A, open day on August 16th, 2000, name is called " be used for neural repair chitosan catheter " and discloses the employing freeze-drying and prepare chitosan catheter, but, be difficult to the chitosan conduit of preparation length greater than 20mm because all there are defective in Mould design and preparation technology.
Summary of the invention
The preparation method that the purpose of this invention is to provide a kind of porous chitosan pipe.It is characterized in that with chitosan, acetic acid, sodium hydroxide be raw material, add the acetum of chitosan earlier in mould, the lock pin mould carries out the lyophilization molding then again, and the demoulding promptly gets the chitosan conduit of length greater than 150mm.Its technical process is
(1) add chitosan in acetum, stirring and dissolving is filtered, and eliminates bubble with the air pump decompression, and its air pressure is less than 100Pa.
(2) socket sloped footing on stainless steel tube, gradation adds chitosan solution, and bubble is eliminated in decompression.
When (3) treating that solution height is lower than the mouth of pipe 5～20mm, socket top cover on sleeve pipe, in solution, insert core by the top cover center hole, make core be positioned at cover tube hub and be inserted into mold bottom, with the mould that fills chitosan solution place-5 ℃～-196 ℃ freezing 8～15 hours, treat complete freezing back taking-up, remove the base and the top cover of mould, use the tap water irrigating canula, the chitosan conduit top layer of freezing is melted, take off sleeve pipe, the chitosan conduit that will have core then places the low temperature continuation freezing.
(4) chitosan conduit that will freeze molding places freezer dryer dry, removes moisture.
(5) take out exsiccant chitosan conduit, place sodium hydroxide solution to soak 8～15 minutes, remove residual acetic acid; And extremely neutral with deionized water wash, the phosphate buffered solution balance of reuse pH=7.4 10～30 minutes is drawn the chitosan conduit surface moisture with filter paper, places baking oven dry, takes out core at last, gets the porous chitosan pipe.
Described chitosan conduit can also be made the outer wall non-perforated pipe, the porous chitosan pipe of belt carcass mould can be placed on and flood 8～15 minutes in the chitosan solution, allow its surface evenly apply one deck chitosan solution, place baking oven dry, in the solution of sodium hydroxide, soaked 15～25 minutes then, washing, phosphate buffered solution balance, drying, what make the outer wall atresia partly connects chitosan conduit.
Described chitosan conduit can also be made the inwall non-perforated pipe, can on core, adhere to certain thickness atresia chitosan film earlier, insert then and fill in the mould of chitosan solution, sharp freezing, lyophilization, deacidification, washing, balance, the final drying demoulding, what make the inwall atresia partly connects chitosan conduit.
The mould of described preparation chitosan conduit is to put sloped footing in telescopic lower end, and the upper end puts the top cover of centre bore, and core is inserted on the sloped footing by top cap central bore, and the inner core of core is a stainless steel bar, and skin is a polyfluortetraethylene pipe.
The invention has the beneficial effects as follows and utilize this method can prepare wall thickness 0.2～1mm, internal diameter 0.5～8mm, average pore size 0.02～0.1mm, porosity 20%～90%, the above porous chitosan pipe of length 150mm, what also can prepare outer wall atresia or inwall atresia simultaneously partly connects antipriming pipe.Be characterized in: (1) mould inserts core after adopting and adding solution earlier among sloped footing, the preparation technology, so both has been beneficial to the adding of the bigger chitosan solution of viscosity, can guarantee that again core is in the cover tube hub; (2) inner core of core is a stainless steel bar, and skin is a teflon sleeve, can guarantee the rigidity of core like this and be beneficial to heat transfer in the refrigerating process, is convenient to the demoulding of chitosan conduit simultaneously; (3) adopt the method for taking off the sleeve pipe postlyophilization earlier, help the mass-and heat-transfer in the dry run like this, reduce drying time, can prepare the bigger porous chitosan pipe of uniform length; (4) preparation outer wall atresia or inwall atresia partly connect antipriming pipe, its rigidity and intensity are higher than full perforation antipriming pipe, can be suitable for the reparation needs of different tissues.
Description of drawings
Fig. 1 illustrates mould structure sketch map used in the present invention.
The specific embodiment
Figure 1 shows that mould structure sketch map used in the present invention.Mould is to put sloped footing 2 in the lower end of sleeve pipe 1, and the upper end puts the top cover 3 of centre bore, and core 4 is inserted on the sloped footing 2 by top cover 3 centre bores, and the inner core 5 of its core 4 is a stainless steel bar, and outer 6 is polyfluortetraethylene pipe.Be the embodiment of preparation porous chitosan pipe below.By the specific embodiment, in conjunction with the accompanying drawings the present invention is described in detail.
Embodiment 1
1. add deacetylation and be 83% chitosan in 1% (v/v) acetum, stirring and dissolving is mixed with the chitosan solution of 2% (m/v), and 200 order nylon cloths filter.Place vacuum drying oven, the room temperature decompression is bled, and air pressure is eliminated the bubble in the solution less than 100Pa.
2. be socket sloped footing 2 on the stainless steel tube 1 of 200mm, internal diameter 16mm in length, gradation adds chitosan solution, and bubble is eliminated in decompression.
When treating that 3. solution height is 185mm, socket top cover 3 on sleeve pipe 1 inserts the core 4 that external diameter is 6mm by top cover 3 center holes in chitosan solution 7, makes core 4 be positioned at sleeve pipe 1 center and is inserted into the bottom of sloped footing 2.The inner core of core 4 is a stainless steel bar 5, and skin is a polyfluortetraethylene pipe 6.
The mould that 4. will fill chitosan solution place-20 ℃ freezing 12 hours.Take out, remove the base 2 and the top cover 3 of mould.With tap water irrigating canula 1, the chitosan conduit top layer of freezing is melted, slough sleeve pipe 1.Then with core 4 with freeze chitosan conduit 7 and place-20 ℃ of refrigerators to continue freezing 2 hours.
The chitosan conduit that 5. will freeze molding places freezer dryer dry, trunk temperature-40 ℃, trunk pressure 12Pa.After 10 hours, chitosan conduit is fully dry.
6. take out chitosan conduit, place 2% sodium hydroxide solution to soak 10 minutes, remove residual acetic acid.Deionized water wash is to neutrality, the phosphate buffered solution balance of reuse pH=7.4 30 minutes.Draw the chitosan conduit surface moisture with filter paper, place 60 ℃ of baking ovens dry.Take out core 4 at last, get the porous chitosan pipe.
The porous chitosan length of tube that present embodiment makes is 150mm, and internal diameter 6mm, wall thickness are 0.5mm, average pore size 0.052mm, and porosity is 75%.
Embodiment 2
The porous chitosan pipe of the belt carcass mould that makes among the embodiment 1 was placed in 2% (m/v) chitosan solution dipping 10 minutes, allow its surface evenly apply one deck chitosan solution, place 60 ℃ of baking ovens dry, soak deacidification in 20 minutes in 2% sodium hydroxide solution, washing, phosphate buffered solution balance, drying, what make the outer wall atresia partly connects chitosan conduit.
The porous chitosan length of tube that present embodiment makes is 150mm, and internal diameter 6mm, wall thickness are 0.55mm, and wherein outer wall does not have the thick 0.06mm of bore portion, average pore size 0.052mm, and porosity is 68%.
Embodiment 3
On core, evenly apply one deck chitosan solution earlier, place 60 ℃ of baking ovens dry, repeat twice, promptly on core, adhered to one deck atresia chitosan film, insert then and fill in the mould of chitosan solution, other technical processs and process conditions are as embodiment 1, and what make the inwall atresia at last partly connects chitosan conduit.
The porous chitosan length of tube that present embodiment makes is 150mm, and internal diameter 6mm, wall thickness are 0.58mm, and wherein inwall does not have the thick 0.09mm of bore portion, average pore size 0.052mm, and porosity is 62%.
Claims (4)
1. the preparation method of a porous chitosan pipe, it is characterized in that: with chitosan, acetic acid, sodium hydroxide is raw material, the acetum that in mould, adds chitosan earlier, lock pin mould again, carry out the lyophilization molding then, the demoulding promptly gets the porous chitosan pipe of length greater than 150mm, and its technical process is:
1. add chitosan in acetum, stirring and dissolving is filtered, and eliminates bubble with the air pump decompression, and its air pressure is less than 100Pa;
2. socket sloped footing on stainless steel tube, gradation adds chitosan solution, and bubble is eliminated in decompression;
When treating that 3. solution height is lower than the mouth of pipe 5～20mm, socket top cover on sleeve pipe, in solution, insert core by the top cover center hole, make core be positioned at cover tube hub and be inserted into mold bottom, with the mould that fills chitosan solution place one 5 ℃～-196 ℃ freezing 8～12 hours, treat complete freezing back taking-up, remove the base and the top cover of mould, use the tap water irrigating canula, the chitosan conduit top layer of freezing is melted, take off sleeve pipe, the chitosan conduit that will have core then places the low temperature continuation freezing;
The chitosan conduit that 4. will freeze molding places freezer dryer dry, removes moisture;
5. take out exsiccant chitosan conduit, place sodium hydroxide solution to soak 8～15 minutes, remove residual acetic acid; And extremely neutral with deionized water wash, the phosphate buffered solution balance of reuse pH=7.4 10～30 minutes is drawn the chitosan conduit surface moisture with filter paper, places baking oven dry, takes out core at last, gets the porous chitosan pipe.
2. according to the preparation method of the described porous chitosan pipe of claim 1, it is characterized in that: this method is also made the chitosan conduit of outer wall atresia, the porous chitosan pipe that is about to the belt carcass mould is placed on and floods 8～15 minutes in the chitosan solution, allow its surface evenly apply one deck chitosan solution, place baking oven dry, in the solution of sodium hydroxide, soaked 15～25 minutes then, washing, phosphate buffered solution balance, drying, what make the outer wall atresia partly connects chitosan conduit.
3. according to the preparation method of the described porous chitosan pipe of claim 1, it is characterized in that: this method is also made the chitosan conduit of inwall atresia, promptly on mandrel surface, evenly adhere to earlier one deck atresia chitosan film, insert then and fill in the mould of chitosan solution, sharp freezing, lyophilization, deacidification, washing, balance, the final drying demoulding, what make the inwall atresia partly connects chitosan conduit.
4. according to the preparation method of the described porous chitosan pipe of claim 1, it is characterized in that: described mould is to put sloped footing in telescopic lower end, the upper end puts the top cover of centre bore, core is inserted on the sloped footing by top cap central bore, the inner core of its core is a stainless steel bar, and skin is a polyfluortetraethylene pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021490864A CN1193803C (en) | 2002-11-22 | 2002-11-22 | Method for preparing porous chitosan tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021490864A CN1193803C (en) | 2002-11-22 | 2002-11-22 | Method for preparing porous chitosan tube |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1404881A CN1404881A (en) | 2003-03-26 |
| CN1193803C true CN1193803C (en) | 2005-03-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB021490864A Expired - Fee Related CN1193803C (en) | 2002-11-22 | 2002-11-22 | Method for preparing porous chitosan tube |
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| CN (1) | CN1193803C (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1298298C (en) * | 2004-05-14 | 2007-02-07 | 清华大学 | Preparation method of chitosan tubular bracket |
| CN1303946C (en) * | 2004-06-25 | 2007-03-14 | 清华大学 | Nerve tissue engineering tube type bracket and method for making same |
| CA2622342C (en) * | 2005-10-12 | 2015-01-13 | Thomas Freier | Processing of chitosan and chitosan derivatives |
| CN102343112A (en) * | 2011-10-09 | 2012-02-08 | 江苏益通生物科技有限公司 | Chitosan artificial nerve graft containing neurotrophic factor and preparation method thereof |
| CN102343114A (en) * | 2011-10-24 | 2012-02-08 | 南通大学 | Tissue engineering nerve graft and application thereof |
| CN107952114A (en) * | 2016-10-14 | 2018-04-24 | 中国科学院大连化学物理研究所 | One kind is based on nano-silver thread conducting three-dimensional biologic bracket material and preparation method thereof |
| CN112573871A (en) * | 2021-01-22 | 2021-03-30 | 周强 | Wear-resistant concrete pavement and preparation method thereof |
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2002
- 2002-11-22 CN CNB021490864A patent/CN1193803C/en not_active Expired - Fee Related
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| CN1404881A (en) | 2003-03-26 |
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