WO1998013030A1 - Matrice ionique biodegradable de polarite interne modulable a polymere greffe - Google Patents
Matrice ionique biodegradable de polarite interne modulable a polymere greffe Download PDFInfo
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- WO1998013030A1 WO1998013030A1 PCT/FR1997/001701 FR9701701W WO9813030A1 WO 1998013030 A1 WO1998013030 A1 WO 1998013030A1 FR 9701701 W FR9701701 W FR 9701701W WO 9813030 A1 WO9813030 A1 WO 9813030A1
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- 229940105423 erythropoietin Drugs 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- QQNSNWTZOFOAKW-UHFFFAOYSA-N ethanol;trimethylazanium;chloride Chemical compound [Cl-].CCO.C[NH+](C)C QQNSNWTZOFOAKW-UHFFFAOYSA-N 0.000 description 1
- STVZJERGLQHEKB-UHFFFAOYSA-N ethylene glycol dimethacrylate Chemical class CC(=C)C(=O)OCCOC(=O)C(C)=C STVZJERGLQHEKB-UHFFFAOYSA-N 0.000 description 1
- 125000000816 ethylene group Chemical group [H]C([H])([*:1])C([H])([H])[*:2] 0.000 description 1
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- 238000001879 gelation Methods 0.000 description 1
- MASNOZXLGMXCHN-ZLPAWPGGSA-N glucagon Chemical compound C([C@@H](C(=O)N[C@H](C(=O)N[C@@H](CCC(N)=O)C(=O)N[C@@H](CC=1C2=CC=CC=C2NC=1)C(=O)N[C@@H](CC(C)C)C(=O)N[C@@H](CCSC)C(=O)N[C@@H](CC(N)=O)C(=O)N[C@@H]([C@@H](C)O)C(O)=O)C(C)C)NC(=O)[C@H](CC(O)=O)NC(=O)[C@H](CCC(N)=O)NC(=O)[C@H](C)NC(=O)[C@H](CCCNC(N)=N)NC(=O)[C@H](CCCNC(N)=N)NC(=O)[C@H](CO)NC(=O)[C@H](CC(O)=O)NC(=O)[C@H](CC(C)C)NC(=O)[C@H](CC=1C=CC(O)=CC=1)NC(=O)[C@H](CCCCN)NC(=O)[C@H](CO)NC(=O)[C@H](CC=1C=CC(O)=CC=1)NC(=O)[C@H](CC(O)=O)NC(=O)[C@H](CO)NC(=O)[C@@H](NC(=O)[C@H](CC=1C=CC=CC=1)NC(=O)[C@@H](NC(=O)CNC(=O)[C@H](CCC(N)=O)NC(=O)[C@H](CO)NC(=O)[C@@H](N)CC=1NC=NC=1)[C@@H](C)O)[C@@H](C)O)C1=CC=CC=C1 MASNOZXLGMXCHN-ZLPAWPGGSA-N 0.000 description 1
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- SDZQEZNDOPDYPP-UHFFFAOYSA-N n,n-dimethylmethanamine;propan-1-amine Chemical compound CCCN.CN(C)C SDZQEZNDOPDYPP-UHFFFAOYSA-N 0.000 description 1
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- OXCMYAYHXIHQOA-UHFFFAOYSA-N potassium;[2-butyl-5-chloro-3-[[4-[2-(1,2,4-triaza-3-azanidacyclopenta-1,4-dien-5-yl)phenyl]phenyl]methyl]imidazol-4-yl]methanol Chemical compound [K+].CCCCC1=NC(Cl)=C(CO)N1CC1=CC=C(C=2C(=CC=CC=2)C2=N[N-]N=N2)C=C1 OXCMYAYHXIHQOA-UHFFFAOYSA-N 0.000 description 1
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- 230000007928 solubilization Effects 0.000 description 1
- 238000005063 solubilization Methods 0.000 description 1
- NHXLMOGPVYXJNR-ATOGVRKGSA-N somatostatin Chemical compound C([C@H]1C(=O)N[C@H](C(N[C@@H](CO)C(=O)N[C@@H](CSSC[C@@H](C(=O)N[C@@H](CCCCN)C(=O)N[C@@H](CC(N)=O)C(=O)N[C@@H](CC=2C=CC=CC=2)C(=O)N[C@@H](CC=2C=CC=CC=2)C(=O)N[C@@H](CC=2C3=CC=CC=C3NC=2)C(=O)N[C@@H](CCCCN)C(=O)N[C@H](C(=O)N1)[C@@H](C)O)NC(=O)CNC(=O)[C@H](C)N)C(O)=O)=O)[C@H](O)C)C1=CC=CC=C1 NHXLMOGPVYXJNR-ATOGVRKGSA-N 0.000 description 1
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- MWKJTNBSKNUMFN-UHFFFAOYSA-N trifluoromethyltrimethylsilane Chemical compound C[Si](C)(C)C(F)(F)F MWKJTNBSKNUMFN-UHFFFAOYSA-N 0.000 description 1
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Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K9/00—Medicinal preparations characterised by special physical form
- A61K9/48—Preparations in capsules, e.g. of gelatin, of chocolate
- A61K9/50—Microcapsules having a gas, liquid or semi-solid filling; Solid microparticles or pellets surrounded by a distinct coating layer, e.g. coated microspheres, coated drug crystals
- A61K9/51—Nanocapsules; Nanoparticles
- A61K9/5107—Excipients; Inactive ingredients
- A61K9/513—Organic macromolecular compounds; Dendrimers
- A61K9/5161—Polysaccharides, e.g. alginate, chitosan, cellulose derivatives; Cyclodextrin
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K9/00—Medicinal preparations characterised by special physical form
- A61K9/48—Preparations in capsules, e.g. of gelatin, of chocolate
- A61K9/50—Microcapsules having a gas, liquid or semi-solid filling; Solid microparticles or pellets surrounded by a distinct coating layer, e.g. coated microspheres, coated drug crystals
- A61K9/5005—Wall or coating material
- A61K9/5021—Organic macromolecular compounds
- A61K9/5036—Polysaccharides, e.g. gums, alginate; Cyclodextrin
Definitions
- the present invention describes a new type of biodegradable particulate matrix and the preparation methods relating thereto.
- vector must be understood here in the broad sense, that is to say that it includes particles having a supporting role, for example when they are incorporated in a composition, either as such, or for transport, presentation. and / or the stabilization of active principle.
- vectorization strategies are based on the use of particulate vectors obtained by the techniques of solvent evaporation, emulsion polymerization, or coacervation (patent WO 93.02712). These are the vectors based on polyesters, polyamides, polypeptides, polyacrylates and derivatives, they are also the microparticles of peptide origin, of gelatins, of alginates, of polyamides obtained by gelation or by interfacial polymerization.
- the ideal vector for the internal incorporation of molecules can have the following characteristics: - a particulate structure obtained easily without using conventional and cumbersome techniques to be used, solvent evaporation or gelling or interfacial covalent crosslinking.
- Such a particulate vector must meet a certain number of requirements relating in particular to its payload, its biocompatibility, its non-toxicity and its biodegradability. It must not disturb physiological balances and must not be immunogenic.
- the only vectors that come close to these specifications are the microparticles of lactic / glycolic acid copolymer and the biodegradable ionic matrices.
- the matrix of these microparticles is made up of biodegradable polyesters from lactic acid and glycolic acid, two intermediates of cellular metabolism.
- the biodegradation rate is maximum for a lactic / glycolic ratio of 1/1 by weight.
- These particulate matrices are essentially prepared by the method known to those skilled in the art, called solvent evaporation described in the patent "WO 93-02712" and by "BENOIT in New Pharmaceutical Forms. Technological, Biopharmaceutical and Medical, P. BURI et al coordinators, Editions LAVOISIER Tec & Doc 1985 page 632 ". To obtain an internal charge to the particle with this type of technology, it is necessary to incorporate the active principle with the polymer from the initial phase of dispersion in organic solvent.
- the solubility of the active ingredient in the organic solvent determines the maximum capacity for incorporation into the particle.
- This process involves the presence of the active ingredient throughout the particle synthesis process, which is detrimental for radioactive and / or toxic products.
- the release of the active principle depends on the rate of biodegradation of the particle but also on the solubilization or diffusion properties of the molecule, therefore on its physical state. In practice, for many molecules, the release rate is not constant over time and turns out to be quite long, which limits the use of this type of vector.
- this technology does not allow the industrial preparation of particles smaller than 200 nm, which considerably restricts therapeutic applications and particularly limits the possibilities of parenteral administration. Finally, those skilled in the art know that it is impossible with this synthesis technique to completely eliminate the residual traces of solvent, which remains problematic.
- Biodegradable ionic matrices also called ion exchange resins, are constituted by a hydrophilic, swellable three-dimensional network, not soluble in water and derived by ionic functions giving them an ion exchange capacity generally between 0 , 1 and 10 mEq / g.
- Synthetic exchange resins are obtained by polymerization or copolymerization, in emulsion or reverse emulsion, of monomers comprising ionic functions, as described in patent WO 93/07862.
- the characteristics of these resins such as the size, the porosity of the ionic matrix, the ion exchange capacity, the swelling rate are controlled by the various parameters of the synthesis process such as the amount of water, the speed of agitation, the amount and type of solvent, the amount, type and concentration of the monomers.
- the monomers commonly used are:
- the unsaturated monoethylenic monomers such as styrenes, styrenes sulfonates, vinyl derivatives, acrylic and methacrylic esters.
- Unsaturated monoethylenic monomers with a protonable or basic function including vinyl-pyridine and its derivatives, derived acrylates and derived methacrylates such as acetate or methacrylamidopropylhydroxyethyl-dimethylammonium chloride.
- Unsaturated polyethylene monomers including ethylene glycol diacrylates, ethylene glycol dimethacrylates, polyvinyl ethylene glycol or glycerol, divinyl ketones, divinyl sulfides, vinyl derivatives with carboxylate or sulfate functions, vinyl derivatives with functions pyridine or ammonium.
- ethylene glycol diacrylates ethylene glycol dimethacrylates
- polyvinyl ethylene glycol or glycerol divinyl ketones
- divinyl sulfides vinyl derivatives with carboxylate or sulfate functions
- vinyl derivatives with functions pyridine or ammonium vinyl derivatives with functions
- Natural polymer resins are generally obtained from polysaccharides derived naturally by ionic functions, for example chitosan, hyaluronic acids, alginates, carrageenans.
- the most widely used technologies are based on the functionalization and crosslinking of biodegradable polysaccharides, for example starch, cellulose or dextran as described in the patent (Fr. 75.17633).
- the matrices thus obtained have ion exchange capacities of between 0.1 and 4 mEq / g.
- Great advantage of this type of polysaccharide matrices is their high capacity for incorporating molecules associated with high biocompatibility and good biodegradability. It should nevertheless be noted that the internal incorporation of weakly hydrophilic compounds is very difficult with this type of matrix.
- the present invention relates to a new type of biodegradable polymeric matrix intended for the transport of molecules and characterized in that the polarity of the ionic matrix can be modulated to allow the internal incorporation of water-soluble or hydrophobic molecules.
- the modulation of the polarity and of the hydrophobicity of the matrix is obtained by the derivation of the hydroxyl functions and / or by the covalent grafting of weakly water-soluble radicals. This substitution, which takes place in a homogeneous manner, can be introduced before, during or after the crosslinking of the polymer.
- the properties of the matrix can therefore be modified by chemical coupling of weakly water-soluble or lipidic reagents, that is to say in particular fatty acids with saturated hydrocarbon chains, straight or branched aliphatic and which comprises from 2 to 30 carbon atoms and preferably from 2 to 12, sterols, fatty amines, hydrophobic amino acids, alkoxy ethers.
- weakly water-soluble or lipidic reagents that is to say in particular fatty acids with saturated hydrocarbon chains, straight or branched aliphatic and which comprises from 2 to 30 carbon atoms and preferably from 2 to 12, sterols, fatty amines, hydrophobic amino acids, alkoxy ethers.
- the reaction is preferably carried out in water which allows maximum swelling of the matrix, added with acetic acid, from 0 to 60% or propionic acid from 0 to 10%.
- the bypass reagent is dispersed in the medium in the form of an emulsion by strong stirring at alkaline pH and at low temperature to avoid hydrolysis of the reagent.
- This new process makes it possible to avoid the use of conventional solvents of polysaccharides and fatty acids such as pyridine, which the person skilled in the art knows that elimination is always difficult, which can limit therapeutic applications.
- the different radicals are preferably grafted using labile bonds of ester type.
- matrices are also characterized in that their surface can be derived non-covalently by polymers after the internal loading of molecules.
- the particle can thus acquire a new character linked to the physicochemical properties of the surface-grafted polymer, for example bioadhesive or non-recognition by the reticuloendothelial system, or tropism for a tissue or activation of the immune system.
- bioadhesive power makes it possible to increase the residence time of the vector, therefore of the active principle at the site of absorption and / or action. It also makes it possible to obtain close contact between the vector and the membrane and to localize the vector in particular areas of the mucous membranes, of the tissues or of the organs chosen. It is therefore advantageous for certain applications to have bioadhesive particles.
- bioadhesive polymers used are of natural or semi-synthetic origin and have many polar groups, a high molecular weight and a very flexible carbon skeleton as described by "JUNGINGER in Pharmaceutical Industry (1991) volume 53 no. ll pl056-1065". They have a great hydration capacity.
- the most widely used polymers are, inter alia, polycarbophiles, alginates, polyacrylates, polyvinyl alcohols. These polymers can be grafted onto the polysaccharide matrix by covalent chemical coupling reactions from hydroxyl groups well known to those skilled in the art. These are techniques based on the use of coupling agents such as epichlorohydrin or bifunctional agents such as diepoxides, dialdehydes, dicarboxylates, diisothiocyanates. It can also be the carbodiimide technique for polymers having a carboxylate function.
- the matrices thus obtained are characterized by the presence of a peripheral layer of bioadhesive polymer of high molecular weight, from 6000 to 50,000 daltons.
- This grafting phase of a surface polymer cannot be carried out after the incorporation step to avoid any risk of chemical modification of the active principle.
- the internal incorporation of molecules is therefore carried out conventionally on matrices already provided with a polymeric covering, which poses many problems because polymers, among other bioadhesives, can interact strongly with certain molecules, in particular molecules of high molecular weight, peptides and polypeptides, charged molecules in general and hinder their incorporation into the matrix. To avoid these difficulties, it is therefore necessary to be able to graft the polymers after the incorporation of the molecules but without the risk of chemical modification.
- the innovative technology developed according to the present invention is characterized in that the polymers are coupled to molecular species called macromolecules allowing grafting onto the charged matrix, by coulombian interactions which are not likely to cause chemical modifications of the molecules of biological interest previously incorporated.
- macromolecules are generally low molecular weight, biodegradable polymers, of natural or synthetic origin, having numerous charges allowing anchoring by Coulomb interactions on the ionic matrix of opposite charge.
- macromolecules are polysaccharides naturally derived by ionic functions, for example chitosan, hyaluronic acids, alginates, carrageenans, polypeptides or functionalized derivatives of biodegradable polysaccharides, for example starch, cellulose or dextran , derivatives of polyglycolic polylactics as well as derivatives of polyacrylates, polymethacrylates and polyphosphates and more generally polymeric macromolecules of size between 5000 daltons and 50,000 daltons, of capacity between 0.2 and 15 mEq / g and having functions, such as hydroxyls or amines, capable of allowing the establishment of covalent bonds with the polymer, for example bioadhesive, by simple chemical reactions.
- ionic functions for example chitosan, hyaluronic acids, alginates, carrageenans, polypeptides or functionalized derivatives of biodegradable polysaccharides, for example starch, cellulose or dextran , derivative
- the polymers can be grafted onto the so-called macromolecular species, by covalent chemical coupling reactions, for example from the hydroxyl groups of the polysaccharides well known to those skilled in the art. These are techniques based on the use of coupling agents such as epichlorohydrin or bifunctional agents such as diepoxides, dialdehydes, dicarboxylates, diisothiocyanates. It can also be the carbodiimide technique for polymers having a carboxylate function.
- the present invention relates to a particulate matrix useful in particular for the transport of molecules with biological activity.
- These particles have a very important stability, a defined size which can be modulated according to the applications by the choice of the crosslinked and functionalized base matrix. They are suitable for the incorporation and transport or vectorization of various synthetic, semi-synthetic, recombinant or natural molecules. These particulate matrices can be used to allow or increase aqueous solubility and dispersibility. They can also be used to obtain a modulation of the modes of release of the molecules in time, to improve the physico-chemical stability of the sensitive molecules, to ensure the transport of the molecules within complex biological systems, eukaryotes or prokaryotes, intended to ensure chemical, photochemical, enzymatic, immunological reactions for pharmaceutical, cosmetological, diagnostic, study and research, fermentation applications. More particularly, the present invention relates to a particulate matrix characterized in that it comprises, in order, from the heart outwards successively:
- hydrophilic internal polymeric layer covering the central core with which it is associated by interactions of various natures, possibly ionic
- the central hydrophilic nucleus can be prepared by various methods well known to those skilled in the art.
- it is a polysaccharide, preferably biodegradable linear or branched, for example starches and their derivatives, cellulose, dextran, polysaccharides naturally derived by ionic functions for example chitosan, acids hyaluronic, alginates, carrageenans
- the ionic matrix is then obtained by crosslinking and derivation by methods well known to those skilled in the art.
- the crosslinking processes can be carried out by the use of coupling agents capable of reacting with the hydroxyl groups of the polysaccharides such as epichlorohydrin, epibromohydrin, bifunctionals such as diepoxides, dialdehydes, dichlorides of dicarboxylic acids, diisothicyanates , mixed anhydrides of dicarboxylic acids.
- the ionic character of the matrix is obtained by using a polymer already derived by ion exchangers or by grafting on neutral polymers of biocompatible and biodegradable ionic ligands, according to methods well known to those skilled in the art.
- the ionic ligands will preferably be chosen from natural molecules present in the body such as succinic acid, citric acid, phosphoric acid, glutamic acid, alanine, glycine.
- the glycidyl-trimethylammonium salts are also used, the glycidyldimethylamine salts.
- Certain basic ligands such as 2 (dimethylamino) ethano 2 (dirnethylamino) ethylamine, 2 (trimethylammonium) ethanol chloride, 3 (trimethylammonium) propylamine are grafted onto the matrix by a bifunctional coupla agent capable of establishing an ester bond or amide.
- succinic acid for coupling to the polysaccharide matrix, succinic acid, phosphorus oxychloride, thiocyanates and diepoxides are used.
- the grafting of the ion exchange functions can be carried out before, during or after the crosslinking step.
- the ionized matrix can be obtained in the form of particles by several methods.
- the first consists in mechanically grinding the gel obtained by mass polymerization.
- the second technique consists in directly producing the matrix in the form of particles by the polymerization technique in dispersion in a liquid immiscible with the reaction phase.
- These particles can be used for the administration of molecules by the oral per lingual, nasal, vaginal, rectal, cutaneous, ocular but also pulmonary and parenteral routes. They can also be used for any topical application.
- These new active principle vehicles are capable of encapsulating a large number of molecules with biological activity such as:
- cardiotonics such as digitoxin and digitalis and its derivatives - vasodilators
- This gel is taken up in 2 liters of water and the pH is adjusted to 5 by adding 2N HCl. The gel is then washed four times in 5 liters of distilled water. We obtain a matrix whose capacity, determined by titration is 1 positive charge for 4 sugars.
- Example 4 Preparation of crosslinked polysaccharide matrices which are weakly hydrophilic and functionalized with succinic acid:
- micromatrices by grinding the canonical matrices: 100 grams of gel prepared according to Example 1 are taken up in 5 liters of water and ground using an Ultraturrax turbine for 7 minutes at 4000 rpm. The micromatrices obtained have a size of between 5 and 25 microns.
- Example 6 Preparation of the micromatrices by grinding the anionic matrices:
- micromatrices obtained have a size of between 15 and 50 microns.
- micromatrices by grinding the matrices ionized by phosphate: 100 grams of gel prepared according to example 3 are taken up in 5 liters of water and ground using an Ultraturrax turbine for 7 minutes at 4000 rpm. The micromatrices obtained have a size of between 0.5 and 5 microns.
- micromatrices obtained have a size of between 50 and 500 microns.
- nanomatrices by grinding the anionic matrices: 100 grams of gel prepared according to Example 2 are taken up in 6 liters of water and ground using an Ultraturrax turbine for 3 minutes at 4000 rpm. This dispersion is then homogenized using a high pressure homogenizer of the Microfluidizer type at 100 bars. The nanomatrices obtained have a size between 50 and 150 nanometers.
- Example 11 Preparation of the nanomatrices by grinding the anionic matrices:
- nanomatrices by grinding the anionic matrices: 100 grams of gel prepared according to Example 4 are taken up in 8 liters of water and ground using an Ultraturrax turbine for 3 minutes at 4000 rpm. This dispersion is then homogenized using a high pressure homogenizer of the Microfluidizer type at 1200 bars. The nanomatrices obtained have a size between 150 and 500 nanometers.
- Example 14 according to the invention:
- Example 15 Ionic anchoring of a polymer derived by an anionic polysaccharide on cationic matrices:
- anionic micromatrices prepared according to example 9 are dispersed in 250 ml of distilled water.
- 10 grams of polymers derived from an anionic polysaccharide according to Example 14 are dispersed in 500 ml of distilled water.
- the microarray dispersion is then added slowly with stirring to the bioadhesive polymer solution. After 2 hours of stirring, the matrices covered with polymer are recovered by decantation and then washed twice with 2 liters of distilled water. 54 grams of cationic matrices with bioadhesive properties are thus obtained.
- Example 17 Loading of aspartic acid in cationic matrices:
- the polymer prepared according to Example 14 is anchored to the matrices prepared according to Example 16, following the process described according to Example 1.
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- Biomedical Technology (AREA)
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Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/269,499 US6346263B1 (en) | 1996-09-27 | 1997-09-26 | Biodegradable ionic matrix of variable internal polarity with grafted polymer |
JP10515356A JP2001500888A (ja) | 1996-09-27 | 1997-09-26 | グラフトされたポリマーをもつ内部極性が調節可能な生物分解性のイオン性マトリックス |
CA002266642A CA2266642A1 (fr) | 1996-09-27 | 1997-09-26 | Matrice ionique biodegradable de polarite interne modulable a polymere greffe |
EP97943009A EP0949911A1 (fr) | 1996-09-27 | 1997-09-26 | Matrice ionique biodegradable de polarite interne modulable a polymere greffe |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR96/11978 | 1996-09-27 | ||
FR9611978A FR2753902B1 (fr) | 1996-09-27 | 1996-09-27 | Nouveau type de matrice ionique biodegradable de polarite interne modulable a polymere greffe |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1998013030A1 true WO1998013030A1 (fr) | 1998-04-02 |
Family
ID=9496258
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR1997/001701 WO1998013030A1 (fr) | 1996-09-27 | 1997-09-26 | Matrice ionique biodegradable de polarite interne modulable a polymere greffe |
Country Status (6)
Country | Link |
---|---|
US (1) | US6346263B1 (fr) |
EP (1) | EP0949911A1 (fr) |
JP (1) | JP2001500888A (fr) |
CA (1) | CA2266642A1 (fr) |
FR (1) | FR2753902B1 (fr) |
WO (1) | WO1998013030A1 (fr) |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6783838B2 (en) * | 2001-04-30 | 2004-08-31 | 3M Innovative Properties Company | Coated film laminate having an ionic surface |
WO2003051227A2 (fr) * | 2001-12-14 | 2003-06-26 | Syed Rizvi | Lingette hygienique utile dans le traitement symptomatique de la vaginite |
US20030232088A1 (en) * | 2002-06-14 | 2003-12-18 | Kimberly-Clark Worldwide, Inc. | Materials with both bioadhesive and biodegradable components |
JP5139302B2 (ja) * | 2005-09-21 | 2013-02-06 | サーモディクス,インコーポレイティド | 天然生分解性多糖を用いたinsituにおける閉塞物の形成方法 |
CA2621595A1 (fr) * | 2005-09-21 | 2007-04-12 | Surmodics, Inc. | Revetements et articles a polysaccharides naturels biodegradables |
US8850784B2 (en) | 2005-11-16 | 2014-10-07 | Lorica International Corporation | Fire retardant compositions and methods and apparatuses for making the same |
EP2068828A2 (fr) * | 2006-09-29 | 2009-06-17 | SurModics, Inc. | Implants oculaires biodégradables, et procédés pour traiter des maladies de l' il |
JP5763525B2 (ja) * | 2008-05-07 | 2015-08-12 | サーモディクス,インコーポレイティド | 粒子からの核酸複合体の送達 |
CN102740862B (zh) * | 2009-12-04 | 2014-12-24 | 美格乐控股公司 | 具有内源性带电配体的水解淀粉微球 |
US8901092B2 (en) | 2010-12-29 | 2014-12-02 | Surmodics, Inc. | Functionalized polysaccharides for active agent delivery |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1992006678A1 (fr) * | 1990-10-15 | 1992-04-30 | Board Of Regents, The University Of Texas System | Microcapsules biocompatibles |
WO1992011871A1 (fr) * | 1990-12-27 | 1992-07-23 | Allergan, Inc. | Suspensions stables permettant la liberation regulee de composes pharmaceutiques |
WO1994020078A1 (fr) * | 1993-03-02 | 1994-09-15 | Biovector Therapeutics Sa | Vecteurs particulaires synthetiques et procede de preparation |
DE4428851A1 (de) * | 1994-08-04 | 1996-02-08 | Diagnostikforschung Inst | Eisen enthaltende Nanopartikel, ihre Herstellung und Anwendung in der Diagnostik und Therapie |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2631826B1 (fr) * | 1988-05-27 | 1992-06-19 | Centre Nat Rech Scient | Vecteur particulaire utile notamment pour le transport de molecules a activite biologique et procede pour sa preparation |
-
1996
- 1996-09-27 FR FR9611978A patent/FR2753902B1/fr not_active Expired - Lifetime
-
1997
- 1997-09-26 EP EP97943009A patent/EP0949911A1/fr not_active Withdrawn
- 1997-09-26 JP JP10515356A patent/JP2001500888A/ja active Pending
- 1997-09-26 WO PCT/FR1997/001701 patent/WO1998013030A1/fr not_active Application Discontinuation
- 1997-09-26 US US09/269,499 patent/US6346263B1/en not_active Expired - Lifetime
- 1997-09-26 CA CA002266642A patent/CA2266642A1/fr not_active Abandoned
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1992006678A1 (fr) * | 1990-10-15 | 1992-04-30 | Board Of Regents, The University Of Texas System | Microcapsules biocompatibles |
WO1992011871A1 (fr) * | 1990-12-27 | 1992-07-23 | Allergan, Inc. | Suspensions stables permettant la liberation regulee de composes pharmaceutiques |
WO1994020078A1 (fr) * | 1993-03-02 | 1994-09-15 | Biovector Therapeutics Sa | Vecteurs particulaires synthetiques et procede de preparation |
DE4428851A1 (de) * | 1994-08-04 | 1996-02-08 | Diagnostikforschung Inst | Eisen enthaltende Nanopartikel, ihre Herstellung und Anwendung in der Diagnostik und Therapie |
Non-Patent Citations (1)
Title |
---|
Y. OHYA ET AL.: "release behaviour of 5-fluorouracil from chitosan-gel microspheres immobilizing 5-fluorouracil derivative coated with polysaccharides and their cell specific recognition", JOURNAL OF MICROENCAPSULATION, vol. 10, no. 1, February 1993 (1993-02-01), LONDON (GB), pages 1 - 9, XP000334990 * |
Also Published As
Publication number | Publication date |
---|---|
US6346263B1 (en) | 2002-02-12 |
FR2753902B1 (fr) | 1999-04-02 |
EP0949911A1 (fr) | 1999-10-20 |
FR2753902A1 (fr) | 1998-04-03 |
CA2266642A1 (fr) | 1998-04-02 |
JP2001500888A (ja) | 2001-01-23 |
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