CN1323096C - Biological degradable polyester micropartical and its preparation process and application - Google Patents
Biological degradable polyester micropartical and its preparation process and application Download PDFInfo
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- CN1323096C CN1323096C CNB200510016822XA CN200510016822A CN1323096C CN 1323096 C CN1323096 C CN 1323096C CN B200510016822X A CNB200510016822X A CN B200510016822XA CN 200510016822 A CN200510016822 A CN 200510016822A CN 1323096 C CN1323096 C CN 1323096C
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Abstract
The present invention belongs to the technical field of the preparation of polyester particles, which particularly to provides particles or microspheres of biodegradable polyester with uniform grain size, a preparation method and the application thereof to medicine control and release. Levorotary and dextrorotatory spatial multiple block poly-lactide is used as a material by the particles. The present invention comprises three different methods, namely a cooling method, a solvent volatilization method and a non-solvent precipitation method. Thus, polymers can be deposited out of a threshold saturation solution of a solvent/nonsolvent mixed system so as to prepare the particles or microspheres whose grain size is from 200 nm to 10 mu m of the polymers. Other surface active agents do not need adding by the method of the present invention, the size of the obtained particles is uniform, and the grain size can be effectively regulated and controlled by the molecular weight of the polymers. The particles has good medicine carrying capability, which is suitable for medicine control and release systems.
Description
Technical field
The invention belongs to the polyester micropartical preparing technical field, relate to the particulate of biodegradable polyesters or microballoon and its production and use particularly.
Background technology
Over past ten years, high molecular particle comprises micro-capsule, microballoon, has obtained in medicine sustained release field paying close attention to widely.Carrier used as small-molecule drug can reach the raising utilization ratio of drug, reduces the effect of toxic side effect.Carrier as protein and polypeptide drug can overcome protein and polypeptide drug transformation period weak point, the shortcoming that easily is hydrolyzed in vivo.Utilize the size difference of particulate, can also make drug release have target.Simultaneously, by the slow release of medicine, the high molecular particle of medicine carrying can reduce administration number of times, improves patient compliance.
The material that is used for the high molecular particle of medicine sustained release at present has a variety of.By sources can be divided into:
(1) natural macromolecular material.Comprise chitosan, sodium alginate, gelatin, cyclodextrin, Mierocrystalline cellulose etc.
(2) synthesized polymer material.Wherein be divided into two classes again, a class is non-Biodegradable material, comprises polyacrylate(s), polyvinyl acetate (PVA) etc.Another kind of is Biodegradable material, comprises polylactide, poly-glycollide, polycaprolactone, poe, poly-acid anhydrides, polycarbonate, their multipolymer, and the segmented copolymer of they and polyoxyethylene glycol etc.
Wherein the synthetic Biodegradable material is owing to wide material sources, and cost is low, and kind is many, can satisfy the different requirements such as the size of particulate by the molecular weight of material and the composition of multipolymer, needs degradation time etc., has been subjected to investigator's favor.Wherein the multipolymer of polylactide and rac-Lactide and glycollide has obtained using the most widely owing to having excellent biological compatibility and biological degradability.
The method for preparing at present high molecular particle (mainly being microballoon) has a variety of.Comprise emulsion method (Advanced Drug Delivery Reviews 1997,28,85-96), the nanometer precipitator method (DrugDevelopment Research 1998,43,98-104), co-agglomeration (Journal of PharmaceuticalSciences 1998,87,259-268), spray method (European Journal of PharmaceuticalSciences 2002,16,305-312), supercritical carbon dioxide process etc.Emulsion method comprises single emulsion method and two emulsion method again.The former is applicable to oil-soluble medicine, and the latter is applicable to water soluble drug, mainly is protein medicaments.Because it is emulsion method technology is simple, and is all applicable to the deliquescent medicine of difference, therefore most widely used.But because emulsion method mainly relies on the dissemination of physics, the particulate that obtains is often not of uniform size, and the drug loading of water miscible medicine is not high.The Ise of Japan chemistry company limited had developed a kind of film emulsion process (Journal of Membrane Science 2000 in recent years, 169,107-117), can prepare uniform polymer microsphere, but this method efficient is lower, and need strict control experiment condition, the material that uses is also had certain restriction.Be mainly used in the preparation polystyrene at present, polymethylmethacrylate, and the microballoon of their multipolymer, the filler as chromatographic column is used to make medicament carrier microspheres seldom.And, for albumen and polypeptide drug, the water-oil interface in two emulsions easily make the medicine inactivation and the parcel efficient not high.Emulsion method also has a shortcoming to need to add various tensio-active agents exactly, and these tensio-active agents have more or less harm to human body, are very disadvantageous for carrier in the application of human body.
(Macromolecules 1992 for the document nearest with the present invention, 25,2940-2946) report, the equal amount of mixture of poly-levorotatory lactide and poly-dextrorotation rac-Lactide, recrystallization forms the three-dimensional mixture of polylactide that fusing point is higher than its corresponding homopolymer (poly-levorotatory lactide or poly-dextrorotation rac-Lactide) in acetonitrile, obtains ball or discus shape of microparticles.Because the starting material of this particulate need be distinguished polymerization levorotatory lactide and dextrorotation rac-Lactide, polymerization process is loaded down with trivial details relatively.Simultaneously, because the price of dextrorotation rac-Lactide is all high more a lot of than the price of levorotatory lactide and racemization rac-Lactide, so the cost of material is also higher relatively.
Summary of the invention
For solving the shortcoming of above-mentioned prior art, the purpose of this invention is to provide polyester micropartical that a kind of biodegradable particle diameter is 200nm～10 μ m or microballoon and preparation method thereof and its application as the sustained release pharmaceutical carrier.
The present invention adopts stereoselective single aluminium triethyl schiff bases complex catalyzer, (Biomacromolecules 2004 for three-dimensional many blocks of optically-active polylactide (the present patent application short title is three-dimensional many blocks of optically-active polylactide) of the left-handed and dextrorotation rac-Lactide that obtains by one-step polymerization racemization rac-Lactide, 5,965-970), its structural formula is as follows:
Wherein the n value is a statistical average value, the unitary number of rac-Lactide in its expression molecular chain in the block of each stereoregular.The size of n value is directly related with the stereoselectivity of used catalyzer, can calculate (Journal of American ChemicalSociety 2001,123,3229-3238 by the homonuclear decoupling nucleus magnetic hydrogen spectrum of polymkeric substance; Journal of Polymer Science Part A:PolymerChemistry 1997,35,1651-1658).The n value is big more, represents that the three-dimensional regularity of this polylactide material is high more.The n value is 8.2～2 among the present invention, and the number-average molecular weight of material is 2,800～80,000.When the three-dimensional regularity of material is enough high, also can form the three-dimensional mixture of polylactide that fusing point is higher than its corresponding homopolymer (poly-levorotatory lactide or poly-dextrorotation rac-Lactide) in three-dimensional many blocks of optically-active rac-Lactide.Compare the three-dimensional mixture that the equivalent miscellany of poly-levorotatory lactide and poly-dextrorotation rac-Lactide forms, the polymerization single polymerization monomer of three-dimensional many blocks of optically-active rac-Lactide is the racemization rac-Lactide, and cost is lower, and polymerisation step finishes, and process is simple, mild condition.Three-dimensional many blocks of optically-active polylactide is basic identical with character such as the biocompatibility of its corresponding common poly-levorotatory lactide and poly-racemization rac-Lactide, toxicity, biological degradabilities.Therefore, be with a wide range of applications.
Preparation method of the present invention is as follows:
In certain solvent system especially poor solvent system, the solubleness of polymkeric substance is relevant with temperature, and when temperature was enough low, polymkeric substance can be precipitated out.Simultaneously, at a certain temperature, in the solvent/non-solvent system of polymkeric substance, polymkeric substance is issued to saturated threshold value at certain solvent/non-solvent ratio and (claims that non-solvent/solvent critical ratio of this moment is Non-solvent/Solvent
Critical, in the present patent application file, be called for short and make N/S
C), when non-solvent/solvent ratio during greater than this critical ratio polymkeric substance just will be precipitated out.The present invention has adopted three kinds of technological methods that three-dimensional many blocks of optically-active polylactide is precipitated out from the saturated solution of the mixed system of its solvent/non-solvent in view of the above, obtains its particulate or microballoon.
1) preparation method of biological degradable polyester micropartical or microballoon comprises falling temperature method, and it comprises following four steps:
(a) three-dimensional many blocks of optically-active polylactide is dissolved in methylene chloride, trichloromethane, tetrahydrofuran (THF) or dioxane during room temperature, obtains the polymers soln that concentration is 0.1～10mg/mL;
(b) to the non-solvent ethanol or the methyl alcohol that wherein add three-dimensional many blocks of optically-active polylactide, the N/S when making non-solvent/solvent ratio the polymkeric substance under the temperature is saturated for this reason
C
(c) this system is cooled to-5～-25 ℃, three-dimensional many blocks of optically-active polylactide is precipitated out;
(d) with the suspension that obtains-5～-25 ℃ centrifugal, abandon clear liquid, vacuum-drying obtains three-dimensional many blocks of optically-active polylactide particulate or microballoon.
2) preparation method of biological degradable polyester micropartical or microballoon comprises solvent evaporation method, and it comprised for four steps, and step (a) wherein is (b) with aforesaid falling temperature method 1), also have following steps:
(c) at room temperature stir the saturated solution of the mixed solvent system of this many blocks of solid optically-active polylactide, good solvent is vapored away, non-solvent/solvent ratio is greater than N/S
C, polymer precipitation comes out;
(d) suspension that obtains is at room temperature centrifugal, abandon clear liquid, vacuum-drying obtains three-dimensional many blocks of optically-active polylactide particulate or microballoon.
3) preparation method of biological degradable polyester micropartical or microballoon comprises the non-solvent precipitator method, and it comprised for four steps, and step (a) wherein is (b) with aforesaid falling temperature method 1), also have following steps:
(c) in the saturated solution of the mixed solvent system of this many blocks of solid optically-active polylactide, add a large amount of non-solvents again, make non-solvent/solvent ratio greater than N/S
C, polymkeric substance then is precipitated out.
(d) suspension that obtains is at room temperature centrifugal, abandon clear liquid, vacuum-drying obtains three-dimensional many blocks of optically-active polylactide particulate or microballoon.
Three-dimensional regularity difference according to used three-dimensional many blocks of optically-active polylactide obtains difform particulate, comprises cake shape, sphere etc.Three-dimensional many blocks of optically-active polylactide of high three-dimensional regularity has similar character with the equal amount of mixture of poly-levorotatory lactide and poly-dextrorotation rac-Lactide, can form the three-dimensional mixture of polylactide, by make its method that is precipitated out from the critical saturated solution of the mixed system of its solvent/non-solvent, the particulate that obtains is cake shape.But, its crystallinity and fusing point the low of mixture that compare.Pure poly-levorotatory lactide or poly-dextrorotation rac-Lactide can not obtain uniform particulate owing to generate tabular crystal.Three-dimensional many blocks of optically-active polylactide of low three-dimensional regularity is because the crystal property difference or the crystallinity energy of not signing an undertaking are subjected to capillary effect and can obtain spherical particle by this method.
All polymkeric substance that prepare owing to method of the present invention are to precipitate simultaneously after surpassing critical state of saturation, therefore the very uniform high molecular particle of the polymer formation size that is precipitated out.Use three-dimensional many blocks of optically-active polylactide of different three-dimensional regularities and different molecular weight, adopt three kinds of above-mentioned preparation methods, can prepare from the particulate or the microballoon of 200 nanometers to 10 micron different size.By the molecular weight of telomerized polymer, can in above-mentioned size range, regulate the size of particulate or microballoon, obtain the particulate or the microballoon of anticipation size.
Uniform biological degradable polyester micropartical of particle diameter provided by the invention or microballoon can be used as pharmaceutical carrier in preparation particulate sustained release medicine.Use it for when supporting medicine; elder generation joins the propylene glycol solution of the medicine of 10mg/mL in the high molecular solution; obtain the homogeneous system that medicine is scattered in polymers soln; the non-solvent that adds polymkeric substance again; make polymkeric substance packaging medicine coprecipitation with method of the present invention, obtain the particulate or the microballoon formulation of packaging medicine.
Because method provided by the invention directly makes polymer be precipitated out in the saturated solution of the mixed system of its solvent/non-solvent, particulate that obtains or microspherulite diameter are very even, and size is adjustable from the nanometer to the micron.And technology is simple, need not adopt any tensio-active agent, avoids introducing harmful material.Use it for when supporting medicine, by regulating the amount of medicine, reach higher drug loading (1～25wt.%), can realize the target administration and the sustained release of medicine good prospects for application being arranged.The described medicine that supports is Regular Insulin or Interferon, rabbit.
Description of drawings
Fig. 1 is the structural formula of left-handed and dextral many blocks of solid polylactide (three-dimensional many blocks of optically-active polylactide).Wherein the n value is 8.2～2, and the number-average molecular weight of material is 2,800～80,000.Fig. 1 also is a specification digest accompanying drawing of the present invention.
Fig. 2 be the three-dimensional optically-active polylactide particulate that supports Regular Insulin PBS (0.1M, pH7.4), the release in vitro behavior in 37 ℃.A, B, C, D are respectively that the n value is respectively 8.2,5.5,4.0,2.0, and number-average molecular weight is respectively 8700,9450,9000, and three-dimensional many blocks of optically-active polylactide of 6400Da supports the release in vitro curve of the particulate of Regular Insulin.
Embodiment
Further specify the present invention below by example, but the present invention is not limited to this.
Embodiment 1: three-dimensional many blocks of the optically-active polylactide (n=8.2) with the high three-dimensional regularity of different molecular weight is a material, and the falling temperature method that adopts method of the present invention to comprise prepares particulate or microballoon.
Be divided into for four steps:
1) take by weighing number-average molecular weight respectively and be respectively 2800,8700,13600,23200, three-dimensional many blocks of optically-active polylactide (n=8.2) 50mg of 79800Da is dissolved in the dichloromethane solvent, and solution is to 50mL;
2) polymers soln is moved in the 250mL round-bottomed flask, each begins to become slightly muddy to wherein slowly dripping dehydrated alcohol to solution;
3) the mixed solvent system of above-mentioned polymkeric substance is placed-20 ℃ respectively and preserve 24h, polymer precipitation is come out;
4)-20 ℃ with the centrifugal 10min of suspension, abandon clear liquid, throw out is vacuum-drying 24h at room temperature.
The particulate that obtains is cake shape (the width diameter of definition cake shape particulate is D, highly is H), the particle diameter result such as the table 1 of the variant polymericular weight of gained.
Table 1:
| Number-average molecular weight (M n) | D(nm) | H(nm) |
| 2800 8700 13600 23200 79800 | 320±50 680±50 2500±200 3600±400 9700±900 | 180±40 320±40 1200±160 2400±300 5700±800 |
Embodiment 2: three-dimensional many blocks of the optically-active polylactide (n=8.2) with the high three-dimensional regularity of different molecular weight is a material, and the solvent evaporation method that adopts method of the present invention to comprise prepares particulate or microballoon.
Be divided into for four steps, wherein step 1) and 2) with embodiment 1, also have following steps:
3) the mixed solvent system of above-mentioned polymkeric substance is placed under the room temperature stir 12h respectively, make the methylene dichloride volatilization fully, polymer precipitation;
4) the centrifugal gained suspension of room temperature 10min abandons clear liquid, vacuum-drying 24h under the throw out room temperature.The particulate that obtains is cake shape, particle diameter such as table 2.
Table 2:
| Number-average molecular weight (M n) | D(nm) | H(nm) |
| 2800 8700 13600 23200 79800 | 340±50 800±70 2600±300 3800±500 10600±900 | 210±50 460±60 1300±250 2500±400 6300±800 |
Embodiment 3: three-dimensional many blocks of the optically-active polylactide (n=8.2) with the high three-dimensional regularity of different molecular weight is a material, and the non-solvent precipitator method that adopt method of the present invention to comprise prepare particulate or microballoon.Be divided into for four steps, wherein step 1) and 2) with embodiment 1, also have following steps:
3) (50～5000mL) make polymer precipitation slowly to add a large amount of dehydrated alcohols again in the mixed solvent system of above-mentioned polymkeric substance;
4) centrifugal gained suspension 10min under the room temperature abandons clear liquid, and throw out is vacuum-drying 24h at room temperature.
The particulate that obtains is cake shape, particle diameter such as table 3.
Table 3:
| Number-average molecular weight (M n) | D(nm) | H(nm) |
| 2800 8700 13600 23200 79800 | 330±50 670±60 2500±300 3500±700 9800±900 | 190±50 420±60 1200±200 2300±400 5800±800 |
Embodiment 4: three-dimensional many blocks of the optically-active polylactide (n=8.2) that with the number-average molecular weight is the high three-dimensional regularity of 8700Da is a material, changes initial macromolecular solution concentration, and the falling temperature method that adopts method of the present invention to comprise prepares particulate or microballoon.
Be divided into for four steps:
1) take by weighing three-dimensional many blocks of optically-active polylactide (n=8.2) 5mg that number-average molecular weight is 8700Da respectively, 25mg, 50mg, 100mg, 500mg are dissolved in the dichloromethane solvent, and solution is to 50mL;
2) polymers soln with different concns moves to respectively in the 250mL round-bottomed flask, and each begins to become slightly muddy to wherein slowly being added dropwise to dehydrated alcohol to solution;
Step 3) and 4) with embodiment 1.
The particulate that obtains is cake shape, particle diameter such as table 4.
Table 4:
| Initial macromolecular solution concentration (mg/mL) | D(nm) | H(nm) |
| 0.1 0.5 1 2 10 | 920±50 790±60 680±50 610±40 470±60 | 540±50 440±50 320±40 280±40 210±50 |
Embodiment 5: three-dimensional many blocks of the optically-active polylactide (n=8.2) that with the number-average molecular weight is the high three-dimensional regularity of 8700Da is a material, changes initial macromolecular solution concentration, and the solvent evaporation method that adopts method of the present invention to comprise prepares particulate or microballoon.
Be divided into for four steps, wherein 1) and 2) with embodiment 4, step 3) and 4) with embodiment 2.
The particulate that obtains is cake shape, particle diameter such as table 5.
Table 5:
| Initial macromolecular solution concentration (mg/mL) | D(nm) | H(nm) |
| 0.1 0.5 1 2 10 | 980±50 870±60 800±70 650±50 490±70 | 570±50 520±50 460±60 310±50 230±60 |
Embodiment 6: three-dimensional many blocks of the optically-active polylactide (n=8.2) that with the number-average molecular weight is the high three-dimensional regularity of 8700Da is a material, changes initial macromolecular solution concentration, and the non-solvent precipitator method that adopt method of the present invention to comprise prepare particulate or microballoon.
Be divided into for four steps, wherein step 1) and 2) with embodiment 4, step 3) and 4) with embodiment 3.
The particulate that obtains is cake shape, particle diameter such as table 6.
Table 6:
| Initial macromolecular solution concentration (mg/mL) | D(nm) | H(nm) |
| 0.1 0.5 1 2 10 | 950±50 800±60 670±60 630±50 480±70 | 550±50 460±50 420±60 290±50 220±60 |
Embodiment 7: three-dimensional many blocks of the optically-active polylactide (n=8.2) that is respectively the high three-dimensional regularity of 8700Da with number-average molecular weight is a material; with different organic solvents is high molecular good solvent, and the falling temperature method that adopts method of the present invention to comprise prepares various particulates or microballoon.
Be divided into for four steps:
1) take by weighing each 50mg of three-dimensional many blocks of optically-active polylactide (n=8.2) that number-average molecular weight is 8700Da respectively, be dissolved in methylene dichloride respectively, trichloromethane, tetrahydrofuran (THF), in the dioxane solvent, solution is to 50mL;
Step 2) to 4) with embodiment 1.
The particulate that obtains is cake shape, particle diameter such as table 7.
Table 7:
| Good solvent | D(nm) | H(nm) |
| Methylene dichloride trichloromethane tetrahydrofuran (THF) dioxane | 680±50 760±70 400±40 350±30 | 320±40 380±50 280±30 250±30 |
Embodiment 8: three-dimensional many blocks of the optically-active polylactide (n=8.2) that is respectively the high three-dimensional regularity of 8700Da with number-average molecular weight is a material; with different organic solvents is high molecular non-solvent, and the falling temperature method that adopts method of the present invention to comprise prepares particulate of all sizes or microballoon.
Be divided into for four steps:
1) take by weighing each 50mg of three-dimensional many blocks of optically-active polylactide (n=8.2) that number-average molecular weight is 8700Da respectively, be dissolved in respectively in the methylene dichloride, solution is to 50mL;
2) polymers soln is moved in the 250mL round-bottomed flask, each begins to become slightly muddy to wherein slowly being added dropwise to dehydrated alcohol and methyl alcohol to solution respectively;
Step 3) and 4) with embodiment 1.
The particulate that obtains is cake shape, particle diameter such as table 8.
Table 8:
| Non-solvent | D(nm) | H(nm) |
| Dehydrated alcohol methyl alcohol | 680±50 600±50 | 320±40 290±40 |
Embodiment 9: (weigh with the unitary number n of the rac-Lactide in the block of stereoregular with various three-dimensional regularity; the n value is big more; three-dimensional regularity is high more); slightly variant three-dimensional many blocks of the optically-active polylactide of molecular weight is a material, and the falling temperature method that adopts method of the present invention to comprise prepares particulate or microballoon.
Be divided into for four steps:
1) (the n value is respectively 8.2 to take by weighing various three-dimensional regularity respectively, 5.5,4.0,2.0), number-average molecular weight is respectively 8700,9450,9000, (material number is respectively P8.2 to three-dimensional many blocks of optically-active polylactide of 6400Da, P5.5, P4.0, P2.0) 50mg is dissolved in the dichloromethane solvent, and solution is to 50mL;
Step 2) to 4) with embodiment 1.
The particulate pattern difference that obtains, (if cake shape, D value and H value are unequal for particle diameter; If spherical, D value and H value equate, the expression microsphere diameter.) also different, as table 9.
Table 9:
| Material | P8.2 | P5.5 | P4.0 | P2.0 |
| n M n(Da) D(nm) H(nm) | 8.2 8700 680±50 320±40 | 5.5 9450 3000±100 3000±100 | 4.0 9000 2700±300 2700±300 | 2.0 3700 700±300 700±300 |
Embodiment 10: with various three-dimensional regularity, slightly variant three-dimensional many blocks of the optically-active polylactide of molecular weight is a material, the slight grain of solvent evaporation method preparation or the microballoon that adopt method of the present invention to comprise.
Be divided into for four steps:
Step 1) and 2) with embodiment 9, step 3) and 4) with embodiment 2.
(if cake shape, D value and H value are unequal for the diameter of particle that obtains; If spherical, D value and H value equate, the expression microsphere diameter.) as table 10.
Table 10:
| Material | P8.2 | P5.5 | P4.0 | P2.0 |
| D(nm) H(nm) | 800±70 460±60 | 3200±120 3200±120 | 2860±350 2860±350 | 820±310 820±310 |
Embodiment 11: with various three-dimensional regularity, slightly variant three-dimensional many blocks of the optically-active polylactide of molecular weight is a material, particulate or microballoon that the non-solvent precipitator method that adopt method of the present invention to comprise prepare.
Be divided into for four steps:
Step 1) and 2) with embodiment 9, step 3) and 4) with embodiment 3.
(if cake shape, D value and H value are unequal for the diameter of particle that obtains; If spherical, D value and H value equate, the expression microsphere diameter.) as table 11.
Table 11:
| Material | P8.2 | P5.5 | P4.0 | P2.0 |
| D(nm) H(nm) | 670±60 420±60 | 2800±100 2800±100 | 2600±292 2600±292 | 660±290 660±290 |
Embodiment 12: with various three-dimensional regularity, slightly variant three-dimensional many blocks of the optically-active polylactide of molecular weight is a material, and the falling temperature method preparation of adopting method of the present invention to comprise supports Regular Insulin (drug loading 3%～15%) particulate or microballoon formulation.
Be divided into for five steps:
1) take by weighing four kinds of three-dimensional many blocks of optically-active polylactide P8.2 of 100mg respectively, P5.5, P4.0, P2.0 are dissolved in the dichloromethane solvent, and solution is to 100mL
2) polymkeric substance is moved in the 500mL round-bottomed flask, (10mg/mL 2mL) slowly is added dropwise to above-mentioned polymers soln with the propylene glycol solution of Regular Insulin;
3) in the mixed system of above-mentioned polymkeric substance and medicine, slowly be added dropwise to dehydrated alcohol to solution and begin to become slightly muddy;
4) gained solution is placed-20 ℃ preserve 24h;
5)-20 ℃ of centrifugation step 4) gained suspension 10min, abandon clear liquid, throw out is used ethanol successively, secondary deionized water washing twice, lyophilize 24h.
Every character of the medicine carrying microgranule that obtains such as table 12, (0.1M, pH7.4), the release behavior under 37 ℃ (adopting the absorption of ultraviolet detection 280nm) is seen Fig. 2 to PBS.
Table 12:
| Material | P8.2 | P5.5 | P4.0 | P2.0 |
| D (nm) H (nm) encapsulation ratio (%) drug loading (%) | 1000±80 420±70 82.8 14.2 | 1500±80 770±60 80.0 13.8 | 990±70 620±60 66.0 11.7 | 1000-5000 1000-5000 18.9 3.6 |
Embodiment 13: with various three-dimensional regularity, slightly variant three-dimensional many blocks of the optically-active polylactide of molecular weight is a material, and the falling temperature method preparation of adopting method of the present invention to comprise supports Interferon, rabbit (drug loading 8%～20%) particulate or microballoon formulation.
(10mg/mL, (10mg/mL, 2mL), remaining experimental procedure is identical with embodiment 12 with method 3mL) to replace the propylene glycol solution of Regular Insulin with the propylene glycol solution of Interferon, rabbit.Every character of the medicine carrying microgranule that obtains such as table 13.
Table 13:
| Material | P8.2 | P5.5 | P4.0 | P2.0 |
| D (nm) H (nm) encapsulation ratio (%) drug loading (%) | 1050±70 430±20 85.0 20.3 | 1500±20 790±20 82.0 19.7 | 1200±30 660±20 70.0 17.4 | 1000-6000 1000-6000 31.0 8.5 |
Claims (5)
1, a kind of particulate of biodegradable polyesters of left-handed and dextral many blocks of solid polylactide, its structural formula is as follows:
N=8.2～2, number-average molecular weight are 2,800～80,000, it is characterized in that this particulate is that particle diameter is the particulate of 200nm～10 μ m.
2. the preparation method of a biological degradable polyester micropartical as claimed in claim 1 is characterized in that, adopts falling temperature method that three-dimensional many blocks of optically-active polylactide is precipitated out from the saturated solution of the mixed system of its solvent/non-solvent, comprises for four steps:
(a) three-dimensional many blocks of optically-active polylactide is dissolved in methylene chloride, trichloromethane, tetrahydrofuran (THF) or dioxane during room temperature, obtains the polymers soln that concentration is 0.1～10mg/mL;
(b) to the non-solvent ethanol or the methyl alcohol that wherein add three-dimensional many blocks of optically-active polylactide, the non-solvent/solvent critical ratio N/S when making non-solvent/solvent ratio the polymkeric substance under the temperature is saturated for this reason
C
(c) this system is cooled to-5～-25 ℃, three-dimensional many blocks of optically-active polylactide is precipitated out;
(d) with the suspension that obtains-5～-25 ℃ centrifugal, abandon clear liquid, vacuum-drying obtains three-dimensional many blocks of optically-active polylactide particulate.
3, a kind of preparation method of biological degradable polyester micropartical as claimed in claim 1 adopts solvent evaporation method that three-dimensional many blocks of optically-active polylactide is precipitated out from the saturated solution of the mixed system of its solvent/non-solvent, and it comprised for four steps:
(a) three-dimensional many blocks of optically-active polylactide is dissolved in methylene chloride, trichloromethane, tetrahydrofuran (THF) or dioxane during room temperature, obtains the polymers soln that concentration is 0.1～10mg/mL;
(b) to the non-solvent ethanol or the methyl alcohol that wherein add three-dimensional many blocks of optically-active polylactide, the non-solvent/solvent critical ratio N/S when making non-solvent/solvent ratio the polymkeric substance under the temperature is saturated for this reason
C
(c) at room temperature stir the saturated solution of the mixed solvent system of this many blocks of solid optically-active polylactide, solvent evaporates is fallen, non-solvent/solvent ratio is greater than N/S
C, polymer precipitation comes out;
(d) suspension that obtains is at room temperature centrifugal, abandon clear liquid, vacuum-drying obtains three-dimensional many blocks of optically-active polylactide particulate.
4, a kind of preparation method of biological degradable polyester micropartical as claimed in claim 1 adopts the non-solvent precipitator method that three-dimensional many blocks of optically-active polylactide is precipitated out from the saturated solution of the mixed system of its solvent/non-solvent, comprises for four steps:
(a) three-dimensional many blocks of optically-active polylactide is dissolved in methylene chloride, trichloromethane, tetrahydrofuran (THF) or dioxane during room temperature, obtains the polymers soln that concentration is 0.1～10mg/mL;
(b) to the non-solvent ethanol or the methyl alcohol that wherein add three-dimensional many blocks of optically-active polylactide, the non-solvent/solvent critical ratio N/S when making non-solvent/solvent ratio the polymkeric substance under the temperature is saturated for this reason
C
(c) in the saturated solution of the mixed solvent system of this many blocks of solid optically-active polylactide, add a large amount of non-solvents again, make non-solvent/solvent ratio greater than N/S
C, polymkeric substance then is precipitated out;
(d) suspension that obtains is at room temperature centrifugal, abandon clear liquid, vacuum-drying obtains three-dimensional many blocks of optically-active polylactide particulate.
5, a kind of biological degradable polyester micropartical as claimed in claim 1 is characterized in that it is used as pharmaceutical carrier in preparation particulate sustained release medicine, and described medicine is Regular Insulin or Interferon, rabbit.
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| CN106700098B (en) * | 2016-12-15 | 2019-02-22 | 浙江大学 | The preparation method of biodegradable supermolecule polylactic acid microsphere |
| CN108579694A (en) * | 2017-12-07 | 2018-09-28 | 青岛智信生物科技有限公司 | The preparation method of porous microsphere |
| CN111529920B (en) * | 2020-04-09 | 2022-04-29 | 四川大学 | Microneedle drug delivery device, manufacturing method thereof and skin disease treatment device |
| CN111514118B (en) * | 2020-05-06 | 2022-04-19 | 南京林业大学 | Preparation method of glucose-modified polylactic acid stereocomplex drug-loaded microspheres and product |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5641745A (en) * | 1995-04-03 | 1997-06-24 | Elan Corporation, Plc | Controlled release biodegradable micro- and nanospheres containing cyclosporin |
| US5733567A (en) * | 1994-04-15 | 1998-03-31 | Pierre Fabre Medicament | Biodegradable, controlled-release microspheres and process for preparing them |
| CN1393267A (en) * | 2001-07-04 | 2003-01-29 | 中国科学院化学研究所 | Medicine releasing system of aliphatic polylactone mixture |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5733567A (en) * | 1994-04-15 | 1998-03-31 | Pierre Fabre Medicament | Biodegradable, controlled-release microspheres and process for preparing them |
| US5641745A (en) * | 1995-04-03 | 1997-06-24 | Elan Corporation, Plc | Controlled release biodegradable micro- and nanospheres containing cyclosporin |
| CN1393267A (en) * | 2001-07-04 | 2003-01-29 | 中国科学院化学研究所 | Medicine releasing system of aliphatic polylactone mixture |
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