CN100563640C - A kind of is the method for preparing microsphere of capsule material with the modified polylactic acid material - Google Patents
A kind of is the method for preparing microsphere of capsule material with the modified polylactic acid material Download PDFInfo
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- CN100563640C CN100563640C CNB200610054516XA CN200610054516A CN100563640C CN 100563640 C CN100563640 C CN 100563640C CN B200610054516X A CNB200610054516X A CN B200610054516XA CN 200610054516 A CN200610054516 A CN 200610054516A CN 100563640 C CN100563640 C CN 100563640C
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Abstract
The invention provides a kind of is the method for preparing microsphere of capsule material with the modified polylactic acid material, adopting modified polylactic acid material is the capsule material, for capsule core material is water solublity or can not be by dissolution with solvents but the surface is the microsphere preparation of hydrophilic material or medicine, elder generation dissolves capsule core material or is dispersed in the water, with modified polylactic acid material be dissolved in its can with the solvent of water immiscible phase in, aqueous solution with capsule core material adds in the solution of modified polylactic acid material then, or the solution of modified polylactic acid material is added in the aqueous solution of capsule core material, or these two kinds of solution are added the solvent that is used for soluble modified poly-lactic acid material simultaneously, or their mixed solution added in the solvent of soluble modified poly-lactic acid material, stir microspheres solution, filter then microsphere.Do not use surfactant and dispersant in the method, preparation process is simple, and particle diameter can reach nanoscale, and particle diameter is controlled, and the encapsulation ratio height can be kept the activity of capsule core material to a great extent, and microsphere has slow-release function.
Description
Technical field
The present invention relates to a kind of method for preparing microsphere, or rather, the present invention relates to a kind of is the capsule material with the modified polylactic acid material, patent " a kind of preparation method of biological activity polylactic acid; product and the purposes " (patent No.: the middle modified polylactic acid material that obtains in modified polylactic acid material of mentioning ZL200310121036.7) and the reaction thereof particularly, or these modified polylactic acid materials and poly-lactic acid material, or the preparation method of the microsphere of the use in conjunction of these modified polylactic acid materials and other materials, the microsphere of this method preparation relates in drug release and other Application for Field.
Background technology
(1) the parcel requirement of material such as medicine
Traditional drug release does not generally have control speed and Targeting Performance, in many cases, and its release drug concentrations that can increase sharply, so that may reach toxic level, afterwards, the very fast again decline of drug level was taken medicine until next time.In order to improve bioavailability of medicament and safety, improve patient's toleration, reduce administration frequency, keep the stable of blood drug level, improve stability of drug and give medicine certain Targeting Performance, biomaterial is used in the release of medicine more and more.Clinically, existing many polymer packaging medicine products just have leuprorelin microsphere (Lupron Depot), triptorelin microsphere (Trelstar Depot), octreotide microsphere (SandostatinLAR), auxin microsphere (Neutropin Depot), goserelin injection implants (Zoladex) and doxycycline hydrochloride gel (Atridox) etc. as the microsphere listing product of polylactic acid and polyglycolic acid parcel.And estimate that the product that will combine medicine and polymer from now on can increase sharply.Studies show that many treatment reagent can be wrapped in the polymer release system, comprise small-molecule drug, protein, dna encoding protein etc.Add in recent years, development along with genetic engineering and gene therapy technology, make polypeptide, protein drug and therapeutic gene continue to bring out, as everyone knows, these biomacromolecules are easy in vivo by enzyme hydrolysis, therefore, develop the interior carrier of body of these bioactive molecules, make it avoid the hydrolysis of enzyme before the performance physiological action, keeping its stability of structure simultaneously is a urgent problem.
The material that useful as drug discharges has natural in synthetic.Hydrophilic natural polymer as collagen, fibrin, alginate etc., can be used for making hydrogel, and bioactive molecule can be attached on the hydrogel, discharge by certain VELOCITY DIFFUSION then, but they is limited to the control of rate of release.Liposome is the normal pharmaceutical carriers that adopt of people, and its release can be by successive leakage from liposome, by the catabolism effect of enzyme or swallowing up or destruction by tissue macrophages.Its shortcoming is because the scavenging action of reticuloendothelial system (RES), causes the utilization rate of capsule material lower at the time of staying in blood short (only a few minutes, by modification, after introducing PEG, can reach tens hours).The carrier of synthetic non-degradable material as the copolymer (EVAc) of ethylene-vinyl acetas, can be regulated the diffusion rate of release of medicine by the aperture.The synthesized degradable material, as polylactic acid, except the diffusion rate of release of regulating medicine by the aperture, also can regulate the rate of release of medicine by the degradation speed of material, like this, they to the adjusting of the rate of release of medicine with regard to many a kind of control modes, in addition, compare with synthetic non-degradable material, their another advantage is, material can be eliminated voluntarily by degraded, has exempted by the operation of modes such as operation with its taking-up.In recent years the degradable microsphere suspension that studies show that can an ideal concentration continue to discharge medicine.
In fact adopt the drug release principle; utilize the capsule material; to reach purpose to the long-term control release of capsule core material; or realization is to the purpose of the chemical constitution protection of capsule core material; or the purpose of the application efficiency of raising capsule core material; can realize the application of microsphere in other field, as parcel insecticide, perfume, magnetic powder etc.
(2) microsphere commonly used prepares (medicine parcel) method
The method that can be used for the microsphere preparation is a lot, be published in the article of " mechanics with put into practice " in April, 2005 at the Fu Xian brightness, and S.2004 Freiberg is published in " International Journal of Pharmaceutics " year, and (2004,282:1-18) last exercise question has carried out summary well for the article of " Polymer microspheres for controlled drug release (polymer microballoon that is used for control drug release) ".For polylactic acid-based lapping, microsphere preparation method commonly used mainly contains emulsifying-solvent evaporation method, multiple emulsion process, phase separation method, spray drying method, fusion method, supercritical fluid method.First three methods all needs to use surfactant or dispersant, and the residual of these reagent may exert an influence to the biocompatibility of microsphere and the activity of medicine; The entrapment efficiency of spray drying method is relative with the productive rate of microsphere low; The serviceability temperature height of fusion method may exert an influence to the activity of medicine; The supercritical fluid method is subjected to the influence of shooting flow volume property, and medicine and preparation technology are had certain selectivity, and to the requirement height of equipment.
Summary of the invention
The purpose of this invention is to provide a kind of is the method for preparing microsphere of capsule material with the modified polylactic acid material, is the deficiency that the method for preparing microsphere of capsule material exists to overcome poly-lactic acid material.
For achieving the above object,, can adopt following measure to prepare microsphere respectively according to the dissolution properties of capsule core material.
1. be water solublity or can not be by dissolution with solvents but the surface is the microsphere preparation of the material or the medicine of hydrophilic nmature for capsule core material, elder generation dissolves capsule core material or is dispersed in the water, with modified polylactic acid material be dissolved in its can with the solvent of water immiscible phase in, aqueous solution with capsule core material adds in the solution of modified polylactic acid material then, or the solution of modified polylactic acid material is added in the aqueous solution of capsule core material, or these two kinds of solution are added the solvent that is used for soluble modified poly-lactic acid material simultaneously, or their mixed solution added in the solvent of soluble modified poly-lactic acid material, follow stirring action simultaneously, through certain hour, obtain microspheres solution, filter then or centrifugal solution, obtain microsphere.
The solvent of described dissolving capsule core material is a water, the solvent of soluble modified poly-lactic acid material be its can with the organic solvent of water immiscible phase.
2. be water-insoluble for capsule core material or the bad dissolubility of water or can not be the microsphere preparation of hydrophobic material or medicine by dissolution with solvents and surface, can be respectively with capsule core material and modified polylactic acid material dissolving or be dispersed in its can with the solvent of water immiscible phase in, solution with capsule core material adds in the solution of modified polylactic acid material then, or the solution of modified polylactic acid material is added in the solution of capsule core material, or add these two kinds of solution in the entry simultaneously, or their mixed solution added in the entry, through certain hour, obtain microspheres solution, filter then or centrifugal solution, obtain microsphere.
The solvent of described dissolving capsule core material and modified polylactic acid material for its can with the organic solvent of water immiscible phase.
So in above-mentioned operation,, can be aided with supersound process to microspheres solution if wish to obtain the littler microsphere of particle diameter, filter then or centrifugal solution, obtain microsphere.
Capsule core material can be macromole and the micromolecule with various dissolution properties in the method, comprise protein, polypeptide, nucleic acid, glycoprotein, biomacromolecules such as polysaccharide, medicine (comprising Chinese medicine), insecticide, fertilizer, herbicide, perfume etc., but be not limited to these materials, method is particularly suitable for easily losing activity under physiological environment and need keeps its active medicine, as protein or polypeptides matter, or under physiological environment, has toxic and side effects and the medicine of its toxic and side effects of needs reduction, as antitumor and anticancer agent, and the medicine that needs sustained release, as cardiovascular drugs.Method also is suitable for wrapping up insoluble solid particle, as cell, virus, magnetic powder etc.
The involved material of method is patent " a kind of preparation method of biological activity polylactic acid, product and the purposes " (patent No.: the middle modified polylactic acid material that obtains in modified polylactic acid material of mentioning ZL200310121036.7) and the reaction thereof; Method also is suitable for the use in conjunction of these modified polylactic acid materials and poly-lactic acid material; Or the use in conjunction of these materials and other materials.
Method that relate to solvent water immiscible phase, comprise all and the solvent of water immiscible phase listed in the solvent handbook, as most alcohol, amine, acid, and a spot of ethers and acetal, ketone, nitrogen-containing compound, sulfur-containing compound and polyfunctional group solvent etc. that can be miscible with water.
The concentration of the solution after the modified polylactic acid material dissolving that relates in the method is 0～1g/ml; Concentration after the capsule core material dissolving is then according to the pharmacological properties requirement of the application requirements or the medicine of this material, and the mass ratio of it and modified polylactic acid material can be 1/500～3/10; The rate of addition of liquid and flow then according to the volume of a container of solution and use, can pass through speed controlling, and its rate of addition can be 0.0001～0.1 meter per second, also can be by flow-control, and its flow can be 1 * 10
-6～10 liters/second; Stirring can be adopted mechanical type or magnetic agitation, and its speed can be 1～1000rpm; Ultrasonication can be adopted body lotion form or probe form, and frequency can be 20kHz～1MHz, and power can be 0～2000W, and ultrasonication can once or several times be finished, and each action time can be from 1 minute to 2 hours; The mixing time that forms microsphere can be 0～10 hour; The centrifugal speed of liquid can be 500～20000rpm; But the microsphere kept dry, nature dries as adopting, vacuum drying, lyophilization, spray drying etc., or preserves with the form of solution.
Among the present invention the solvent of dissolving solvent of capsule core material and soluble modified poly-lactic acid material and and both solvents of adding simultaneously between volume ratio be 1～10: 1～10: 1～500.
Adopt designed method of the present invention, can prepare drug release carrier, and be suitable for the application that other require preparation microsphere field.
Compare with existing polylactic acid microsphere preparation method, the inventive method mainly contains following advantage: 1. operating procedure is few, and process is simple, and preparation cost is low; 2. in whole process, do not use surfactant or the dispersant that arrives commonly used in the preparation of general polylactic acid microsphere, therefore avoided since surfactant or dispersant use brought to the microsphere biocompatibility and to the active influence of capsule core material; 3. the microspherulite diameter little (nanoscale) of this method preparation, and particle diameter is controlled, the encapsulation ratio height; 4. owing to the special nature of the lapping that adopts in the method, the microsphere of this method preparation can be kept the activity of capsule core material largely; 5. this method can be wrapped up the material with various parent/hydrophobic properties; 6. by selecting modified polylactic acid material, can prepare microsphere with Targeting Performance.7. the microsphere of method preparation has slow-release function.
Description of drawings
Fig. 1 be adopt the inventive method (seeing embodiment 10) preparation parcel the microsphere of hydrophobicity fluorescent material FITC, amplifying (Olympus, image IX-71) under 1000 times the fluorescence microscope.
The specific embodiment
Embodiment 1: capsule core material is a hydrophobic drug
Taking polyethylene glycol modified polylactic acid material 100 grams, be dissolved in 100 milliliters of oxolanes, other gets antiviral agents acyclovir (Aciclovir) 30 grams, be dissolved in 1 liter of oxolane, the speed of poly ethyldiol modified poly-lactic acid material solution with 5 milliliters of per minutes is added dropwise in the solution of acyclovir, the speed mechanical that accompanies by 300 rev/mins simultaneously stirred 10 hours, adopting power is 200 watts, frequency is the ultrasonication 2 hours of 20kHz, filter, obtained wrapping up the microsphere of acyclovir, by lyophilization.
Embodiment 2: capsule core material is a hydrophilic medicament
Get maltose modified polylactic acid material 10 grams, be dissolved in 1 liter of isopropyl alcohol, other gets antidiabetic drug insulin 20mg, is dissolved in 100 ml distilled waters, and the speed of insulin solutions with 2 milliliters of per minutes is added dropwise in the solution of maltose modified polylactic acid material, accompany by 1000 rev/mins speed magnetic agitation 2 hours simultaneously, adopting power is 600 watts, and frequency is the ultrasonication 1 hour of 40kHz, filters, obtain wrapping up the microsphere of insulin, passed through vacuum drying.
Embodiment 3: capsule core material is a hydrophobic drug
Get dextran modified polylactic acid material 10 grams, be dissolved in 500 milliliters of dimethyl sulfoxines, other gets antineoplastic agent altretamine (Altretamine) 100mg, be dissolved in 500 milliliters of dimethyl sulfoxines, the speed of two kinds of solution with 10 milliliters of per minutes is added dropwise in 25 liters of distilled water, and the speed mechanical that accompanies by 500 rev/mins simultaneously stirred 1 hour, adopted 3000 rev/mins speed centrifugal then, obtain wrapping up the microsphere of altretamine, passed through spray drying.
Embodiment 4: capsule core material is a hydrophilic medicament
Protein modified poly-lactic acid material 10 grams of collagen are separated in water intaking, be dissolved in 500 milliliters of dimethyl formamides, other gets the antihypertensive maleic acid according to that shop sharp (Enalapril Maleate) 1 gram, be dissolved in 200 milliliters of ethanol, maleic acid is added dropwise in the solution of hydrolytic collagen polydactyl acid according to the speed of the sharp solution in that shop with 10 milliliters of per minutes, accompany by 500 rev/mins speed magnetic agitation 40 minutes simultaneously, adopting power is 200 watts, frequency is the ultrasonication 5 minutes of 1MHz, solution is added in 5 premium on currency again, 20000 rev/mins speed is centrifugal, has obtained wrapping up maleic acid according to the sharp microsphere in that shop, passes through spray drying.
Embodiment 5: capsule core material is the hydrophobicity insecticide
Get glucose modified poly-lactic acid material 10 grams, be dissolved in 500 milliliters of pyridines, other gets botanical pesticide quintessence oil 2 grams, be dissolved in 200 ml methanol, the speed of quintessence oil solution with 20 milliliters of per minutes is added dropwise in the solution of poly ethyldiol modified polylactic acid, accompany by 200 rev/mins speed magnetic agitation 3 hours simultaneously, again this solution is added in 2 premium on currency, centrifugal with 5000 rev/mins speed then, obtained wrapping up the microsphere of quintessence oil, by drying naturally.
Embodiment 6: capsule core material is a virion
Get galactose modified polylactic acid material 10 grams, be dissolved in the 300ml caproic acid, other gets retroviral vector 20mg, be scattered in the 50ml water, with the speed of galactose polydactyl acid solution with per minute 30ml, the aqueous dispersions of viral vector is added dropwise in 5 premium on currency with the speed of per minute 5ml, the speed mechanical that accompanies by 100 rev/mins simultaneously stirred 30 minutes, speed with 15000 rev/mins is centrifugal, has obtained wrapping up the microsphere of transcription vector, by lyophilization.
Embodiment 7: capsule core material is a cell granulations
Get nucleic acid modified polylactic acid material 10 grams, be dissolved in the 800ml diox, other gets sexual cell---sperm 100mg, be scattered in the 500ml water, with the speed of nucleic acid polydactyl acid solution with per minute 20ml, the aqueous dispersions of sperm is added dropwise in 2 premium on currency with the speed of per minute 12ml, the speed mechanical that accompanies by 100 rev/mins simultaneously stirred 50 minutes, again solution is added in 5 premium on currency, centrifugal with 3000 rev/mins speed then, obtained wrapping up the microsphere of sperm.
Embodiment 8: capsule core material is DNA
Get glycoprotein modified polylactic acid material 10 grams, be dissolved in the 600ml methyl acetone, other gets DNA50mg, be dissolved in the 600ml diethylamine, poly ethyldiol modified polylactic acid solution and the dna solution speed with per minute 20ml is added dropwise in 3 premium on currency, and the speed mechanical that accompanies by 300 rev/mins simultaneously stirred 1 hour, and is centrifugal with 5000 rev/mins speed, obtained wrapping up the microsphere of DNA, vacuum drying.
Embodiment 9: capsule core material is a magnetic powder particle
Get mannose modified polylactic acid material 10 grams, be dissolved in the 300ml N-Methyl pyrrolidone, other gets magnetic powder 2 grams and is scattered in 3 premium on currency, the speed of poly ethyldiol modified polylactic acid solution with per minute 20ml is added dropwise in the magnetic powder dispersion liquid, the speed mechanical that accompanies by 400 rev/mins simultaneously stirred 2 hours, filter, obtained wrapping up the microsphere of magnetic powder, dry naturally.
Embodiment 10: capsule core material is the hydrophobicity fluorescent material
Get polypeptide modified polylactic acid material 10 grams, be dissolved in the 100ml oxolane, other gets fluorescence isothiocyanate (FITC) 100mg, be dissolved in the 50ml oxolane, the solution of the fluorescence isothiocyanate speed with per minute 5ml is added dropwise in the solution of poly ethyldiol modified polylactic acid, do not follow stirring, after dripping end, speed with 5500 rev/mins is centrifugal, has obtained wrapping up the microsphere of fluorescence isothiocyanate, and the shape of microsphere is seen Fig. 1.
Claims (10)
1, a kind of is the method for preparing microsphere of capsule material with the modified polylactic acid material, steps of the method are: taking polyethylene glycol modified polylactic acid material 100 grams, be dissolved in 100 milliliters of oxolanes, other gets antiviral agents acyclovir 30 grams, be dissolved in 1 liter of oxolane, the speed of poly ethyldiol modified poly-lactic acid material solution with 5 milliliters of per minutes is added dropwise in the solution of acyclovir, the speed mechanical that accompanies by 300 rev/mins simultaneously stirred 10 hours, adopting power is 200 watts, frequency is the ultrasonication 2 hours of 20kHz, filter, obtain wrapping up the microsphere of acyclovir, by lyophilization.
2, a kind of is the method for preparing microsphere of capsule material with the modified polylactic acid material, steps of the method are: get dextran modified polylactic acid material 10 grams, be dissolved in 500 milliliters of dimethyl sulfoxines, other gets antineoplastic agent altretamine 100mg, be dissolved in 500 milliliters of dimethyl sulfoxines, the speed of two kinds of solution with 10 milliliters of per minutes is added dropwise in 25 liters of distilled water, the speed mechanical that accompanies by 500 rev/mins simultaneously stirred 1 hour, adopt 3000 rev/mins speed centrifugal then, obtain wrapping up the microsphere of altretamine, pass through spray drying.
3, a kind of is the method for preparing microsphere of capsule material with the modified polylactic acid material, steps of the method are: get glucose modified poly-lactic acid material 10 grams, be dissolved in 500 milliliters of pyridines, other gets botanical pesticide quintessence oil 2 grams, be dissolved in 200 ml methanol, the speed of quintessence oil solution with 20 milliliters of per minutes is added dropwise in the solution of poly ethyldiol modified polylactic acid, accompany by 200 rev/mins speed magnetic agitation 3 hours simultaneously, again this solution is added in 2 premium on currency, centrifugal with 5000 rev/mins speed then, obtain wrapping up the microsphere of quintessence oil, by drying naturally.
4, a kind of is the method for preparing microsphere of capsule material with the modified polylactic acid material, steps of the method are: get glycoprotein modified polylactic acid material 10 grams, be dissolved in the 600ml methyl acetone, other gets DNA50mg, is dissolved in the 600ml diethylamine, and poly ethyldiol modified polylactic acid solution and the dna solution speed with per minute 20ml is added dropwise in 3 premium on currency, the speed mechanical that accompanies by 300 rev/mins simultaneously stirred 1 hour, speed with 5000 rev/mins is centrifugal, obtains wrapping up the microsphere of DNA, vacuum drying.
5, a kind of is the method for preparing microsphere of capsule material with the modified polylactic acid material, steps of the method are: get polypeptide modified polylactic acid material 10 grams, be dissolved in the 100ml oxolane, other gets fluorescence isothiocyanate 100mg, be dissolved in the 50ml oxolane, the solution of the fluorescence isothiocyanate speed with per minute 5ml is added dropwise in the solution of poly ethyldiol modified polylactic acid, do not follow stirring, after dripping end, speed with 5500 rev/mins is centrifugal, obtains wrapping up the microsphere of fluorescence isothiocyanate.
6, a kind of is the method for preparing microsphere of capsule material with the modified polylactic acid material, steps of the method are: get maltose modified polylactic acid material 10 grams, be dissolved in 1 liter of isopropyl alcohol, other gets antidiabetic drug insulin 20mg, be dissolved in 100 ml distilled waters, the speed of insulin solutions with 2 milliliters of per minutes is added dropwise in the solution of maltose modified polylactic acid material, accompany by 1000 rev/mins speed magnetic agitation 2 hours simultaneously, adopting power is 600 watts, frequency is the ultrasonication 1 hour of 40kHz, filter, obtain wrapping up the microsphere of insulin, pass through vacuum drying.
7, a kind of is the method for preparing microsphere of capsule material with the modified polylactic acid material, steps of the method are: protein modified poly-lactic acid material 10 grams of collagen are separated in water intaking, be dissolved in 500 milliliters of dimethyl formamides, other gets the antihypertensive maleic acid according to sharp 1 gram in that shop, be dissolved in 200 milliliters of ethanol, maleic acid is added dropwise in the solution of hydrolytic collagen polydactyl acid according to the speed of the sharp solution in that shop with 10 milliliters of per minutes, accompany by 500 rev/mins speed magnetic agitation 40 minutes simultaneously, adopting power is 200 watts, frequency is the ultrasonication 5 minutes of 1MHz, solution is added in 5 premium on currency again, 20000 rev/mins speed is centrifugal, obtain wrapping up maleic acid according to the sharp microsphere in that shop, pass through spray drying.
8,, a kind of is the method for preparing microsphere of capsule material with the modified polylactic acid material, steps of the method are: get galactose modified polylactic acid material 10 grams, be dissolved in the 300ml caproic acid, other gets retroviral vector 20mg, be scattered in the 50ml water, with the speed of galactose polydactyl acid solution with per minute 30ml, the aqueous dispersions of viral vector is added dropwise in 5 premium on currency with the speed of per minute 5ml, the speed mechanical that accompanies by 100 rev/mins simultaneously stirred 30 minutes, speed with 15000 rev/mins is centrifugal, obtain wrapping up the microsphere of transcription vector, by lyophilization.
9, a kind of is the method for preparing microsphere of capsule material with the modified polylactic acid material, steps of the method are: get nucleic acid modified polylactic acid material 10 grams, be dissolved in the 800ml diox, other gets sexual cell---sperm 100mg, be scattered in the 500ml water, with the speed of nucleic acid polydactyl acid solution with per minute 20ml, the aqueous dispersions of sperm is added dropwise in 2 premium on currency with the speed of per minute 12ml, the speed mechanical that accompanies by 100 rev/mins simultaneously stirred 50 minutes, solution is added in 5 premium on currency again, centrifugal with 3000 rev/mins speed then, obtain wrapping up the microsphere of sperm.
10, a kind of is the method for preparing microsphere of capsule material with the modified polylactic acid material, steps of the method are: get mannose modified polylactic acid material 10 grams, be dissolved in the 300ml N-Methyl pyrrolidone, other gets magnetic powder 2 grams and is scattered in 3 premium on currency, the speed of poly ethyldiol modified polylactic acid solution with per minute 20ml is added dropwise in the magnetic powder dispersion liquid, and the speed mechanical that accompanies by 400 rev/mins simultaneously stirred 2 hours, filtered, obtain wrapping up the microsphere of magnetic powder, dry naturally.
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| CN112245594B (en) * | 2020-08-17 | 2022-04-08 | 广西医科大学 | Non-viral nanoparticle for gene molecule delivery and preparation method and application thereof |
| CN112889844B (en) * | 2021-02-01 | 2021-12-07 | 山东省寄生虫病防治研究所 | Method for preventing and treating culex pipiens pallens by using beauveria bassiana |
| CN117122531B (en) * | 2023-10-27 | 2024-08-09 | 磐升瑞祥(山东)生物工程股份有限公司 | Novel poly-L-lactic acid microsphere with high biocompatibility and preparation and application thereof |
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