WO2003027169A1 - Materiau compose d'au moins un polymere biodegradable et de cyclodextrines - Google Patents
Materiau compose d'au moins un polymere biodegradable et de cyclodextrines Download PDFInfo
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- WO2003027169A1 WO2003027169A1 PCT/FR2002/003321 FR0203321W WO03027169A1 WO 2003027169 A1 WO2003027169 A1 WO 2003027169A1 FR 0203321 W FR0203321 W FR 0203321W WO 03027169 A1 WO03027169 A1 WO 03027169A1
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- 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
- A61K9/5146—Organic macromolecular compounds; Dendrimers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polyethylene glycol, polyamines, polyanhydrides
- A61K9/5153—Polyesters, e.g. poly(lactide-co-glycolide)
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K47/00—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient
- A61K47/50—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates
- A61K47/51—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent
- A61K47/56—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent the modifying agent being an organic macromolecular compound, e.g. an oligomeric, polymeric or dendrimeric molecule
- A61K47/59—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent the modifying agent being an organic macromolecular compound, e.g. an oligomeric, polymeric or dendrimeric molecule obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polyureas or polyurethanes
- A61K47/593—Polyesters, e.g. PLGA or polylactide-co-glycolide
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K47/00—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient
- A61K47/50—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates
- A61K47/69—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the conjugate being characterised by physical or galenical forms, e.g. emulsion, particle, inclusion complex, stent or kit
- A61K47/6949—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the conjugate being characterised by physical or galenical forms, e.g. emulsion, particle, inclusion complex, stent or kit inclusion complexes, e.g. clathrates, cavitates or fullerenes
- A61K47/6951—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the conjugate being characterised by physical or galenical forms, e.g. emulsion, particle, inclusion complex, stent or kit inclusion complexes, e.g. clathrates, cavitates or fullerenes using cyclodextrin
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P35/00—Antineoplastic agents
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y5/00—Nanobiotechnology or nanomedicine, e.g. protein engineering or drug delivery
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G81/00—Macromolecular compounds obtained by interreacting polymers in the absence of monomers, e.g. block polymers
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- 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
- A61K9/14—Particulate form, e.g. powders, Processes for size reducing of pure drugs or the resulting products, Pure drug nanoparticles
- A61K9/16—Agglomerates; Granulates; Microbeadlets ; Microspheres; Pellets; Solid products obtained by spray drying, spray freeze drying, spray congealing,(multiple) emulsion solvent evaporation or extraction
- A61K9/1605—Excipients; Inactive ingredients
- A61K9/1629—Organic macromolecular compounds
- A61K9/1652—Polysaccharides, e.g. alginate, cellulose derivatives; Cyclodextrin
Definitions
- the present invention relates to new materials based on biodegradable polymers and cyclic oligosaccharides, preferably cyclodextrins, particles derived from these materials and their uses as biological vectors for active materials.
- the present invention relates very particularly to the field of vectors of the nano- and microparticles type and their applications.
- Nanoparticles includes nanospheres as well as nanocapsules.
- Nanocapsules are vesicular vectors formed by an oily cavity surrounded by a polymeric wall, and nanospheres are made up of a polymer matrix capable of encapsulating active ingredients.
- the active products are incorporated at the level of the nanoparticles either during the polymerization process of the monomers from which the nanoparticles are derived, or by adsorption on the surface of the nanoparticles already formed, or during the manufacture of the particles from the preformed polymers.
- nano- and microparticles are already proposed in the literature. Conventionally, they are derived from a material obtained by direct polymerization of monomers (for example cyanoacrylates), by crosslinking, or else they are produced from preformed polymers: poly (lactic acid) (PLA), po! Y (glycolic acid) (PGA), poly ( ⁇ -caprolactone) (PCL), and their copolymers, such as for example poly (lactic acid-co-glycolic acid) (PLGA), etc.
- PLA poly (lactic acid)
- PGA po! Y (glycolic acid)
- PCL poly ( ⁇ -caprolactone)
- PLGA poly (lactic acid-co-glycolic acid)
- the first object of the present invention is precisely to propose a material making it possible to overcome these drawbacks.
- Its second object relates to particles, preferably nanoparticles, obtained from such a material.
- the invention also aims in a third object, the use of these particles and in particular as biological vehicles.
- the first aspect of the invention relates to a material composed of at least one biodegradable polymer and of a cyclic oligosaccharide, characterized in that at least one molecule o of said oligosaccharide is grafted via a bond covalent to at least one molecule of said biodegradable polymer.
- the material developed according to the present invention has the first advantage of having a controlled structure and therefore of being able to be prepared in a reproducible manner.
- the biodegradable polymer used is in particular characterized in terms of molar mass.
- the claimed material is obtained by functionalization of the molecule of a biodegradable polymer with at least one molecule of cyclic oligosaccharide.
- This functionalization is carried out by establishing a covalent bond between the two types of molecule.
- this covalent bond is biodegradable and preferably derives from the reaction between a carboxylic acid function and a hydroxyl function, leading to an ester function.
- this bond is derived from the reaction between a carboxylic function, optionally activated, present on the biodegradable polymer and a hydroxyl function present on the oligosaccharide.
- the preferred activated derivatives of the acid are either the N-hydroxysuccinimide ester, previously synthesized and isolated, or derivatives obtained "in situ" and not isolated from the reaction medium, for example that derived from carbonyidiimidazole (CDI)
- This reactive function preferably derives from the carboxylic function which can either be naturally present on the backbone of the biodegradable polymer or have been introduced there before at its backbone, so as to allow its subsequent coupling with a molecule of a cyclic oligosaccharide.
- the claimed material is composed of a copolymer in accordance with the invention which is grafted at the level of said biodegradable polymer to a second molecule of cyclic oligosaccharide, a second molecule of biodegradable polymer and / or a molecule distinct from said biodegradable polymer and from said cyclic oligosaccharide.
- Figure 1 are shown schematically structures according to the invention.
- the biodegradable polymer molecule is grafted, preferably in the terminal position, by a biodegradable covalent bond, preferably of the ester type, to at least two cyclic oligosaccharide molecules, preferably of the cyclodextrin type. .
- the biodegradable polymer molecule is grafted by a biodegradable covalent bond, preferably of ester type, to at least one oligosaccharide molecule, preferably of cyclodextrin type and a molecule of a separate polymer , preferably poly (ethylene glycol).
- This second variant consisting in fixing at the free end of the biodegradable polymer, a second molecule or macromolecule is particularly advantageous when it is desired to prevent any spontaneous self-encapsulation of the hydrophobic chain of said biodegradable polymer in the cavity of the oligosaccharide more particularly. a cyclodextrin. In this way, it ensures the availability of said cavity for any hydrophobic active principle.
- the graft (s) carried by the biodegradable polymer molecule is also grafted by a biodegradable function, preferably of the ester type, to one or more other molecules of said biodegradable polymer, thus making it possible to obtain materials of very high molar mass (crosslinked).
- the materials according to the invention have the second advantage of having satisfactory biodegradability due to the chemical nature of the polymers which constitute it.
- biodegradable is intended to denote any polymer which dissolves or degrades in a period acceptable for the application for which it is intended, usually in in vivo therapy. Generally, this period must be less than 5 years and more preferably one year when a corresponding physiological solution is exposed with a pH of 6 to 8 and at a temperature between 25 ° C and 37 ° C.
- the biodegradable polymers according to the invention are or are derived from synthetic or natural biodegradable polymers.
- polyesters PLA, PGA, PCL, and their copolymers, such as for example PLGA. Indeed, their biodegradability and biocompatibility have been widely established.
- Other synthetic polymers are also being investigated. These are polyanhydrides, poly (alkylcyanoacrylates), polyorthoesters, polyphosphazenes, polyamino acids, polyamidoamines, polysiloxane, polyesters such as polyhydroxybutyrate or poly (malic acid), as well as their copolymers and derivatives.
- Natural biodegradable polymers proteins such as albumin or gelatin, or polysaccharides such as alginate, dextran or chitosan may also be suitable.
- biodegradable polymer preferably corresponds to general formula I:
- - n and m represent independently of each other, either 0 or 1,
- - Ri represents a C ⁇ -C 2 o alkyl group, a polymer different from the biodegradable polymer [for example poly (ethylene glycol) (PEG)], or a copolymer containing PEG blocks or ethylene oxide units, such as for example a Pluronic® polymer], a protected reactive function present on the polymer (eg BOC-NH-), a carboxylic function or a hydroxyl function and
- R 2 represents a hydroxyl function or a carboxylic function.
- Polyesters are especially preferred as biodegradable polymers according to the invention: poly (lactic acid) (PLA), poly (glycolic acid) (PGA), poly ( ⁇ -caprolactone) (PCL), and their copolymers, such as for example poly (lactic acid-co-glycolic acid) (PLGA), synthetic polymers such as polyanhydrides, poly (alkylcyanoacrylates), polyorthoesters, polyphosphazenes, polyamides (eg polycaprolactam), polyamino acids, polyamidoamines, poly (alkylene d-tartrate), polycarbonates , polysiloxane, polyesters such as polyhydroxybutyrate or polyhydroxyvalerate, or poly (malic acid), as well as the copolymers of these materials and their derivatives.
- PLA poly (lactic acid)
- PGA poly (glycolic acid)
- PCL poly ( ⁇ -caprolactone)
- PA poly (lactic acid-co-glycolic acid)
- the claimed material is also particularly advantageous for developing nanoparticles or microparticles having a high encapsulation capacity thanks to the presence within its structure of cyclic oligosaccharide molecules.
- the encapsulation rate is a function of the mass rate of cyclic oligosaccharide.
- oligosaccharide is intended to denote a cyclic chain of at most 15 and preferably at most 10 monosaccharide units joined by glycosidic bonds.
- the cyclic oligosaccharide is preferably chosen from cyclodextrins which can be neutral or charged, native (cyclodextrins ⁇ , ⁇ , ⁇ , ⁇ , ⁇ ), branched or polymerized or else chemically modified for example by substitution of one or more hydroxyls by groups such as alkyls, aryls, arylalkyls, glycosyls, by etherification with alcohols or by esterification with aliphatic acids, as well as by grafting of polymeric links (eg polyethylene glycol).
- groups such as alkyls, aryls, arylalkyls, glycosyls, by etherification with alcohols or by esterification with aliphatic acids, as well as by grafting of polymeric links (eg polyethylene glycol).
- groups eg polyethylene glycol.
- more particularly preferred are hydroxypropyl, methyl and thiobutyl ether groups.
- the presence of at least one molecule and preferably two molecules of cyclic oligosaccharides, in particular of cyclodextrins covalently linked to the hydrophobic polymer in the material according to the invention is particularly advantageous. It allows the active principle, intended to be transported using particles derived from the claimed material, to penetrate inside the polymer structure of said material and this whatever its nature, namely hydrophobic, amphiphilic and / or insoluble . This results in a significantly increased encapsulation yield due to the presence of the hydrophobic internal cavities of the cyclodextrins. These allow on the one hand to increase the charge in active principle, and on the other hand to access a better control of the release profile.
- the claimed material has a mass content of cyclic oligosaccharide, preferably cyclodextrin, at least equal to 10% and advantageously between approximately 20 and 40%.
- the material according to the invention is also particularly advantageous in terms of bioadhesion and targeting properties for the particles which are derived therefrom at the level of organs and / or cells. .
- the second variant of the invention relates to a material composed of molecules of biodegradable polymers grafted on the one hand to a molecule of a cyclic oligosaccharide, preferably of the cyclodextrin type, and on the other hand to a molecule of a biodegradable polymer distinct, is particularly interesting in this respect. According to this variant, it is in fact possible to envisage incorporating, at the level of the structure of the material, compounds intended to intervene in level of the release profile of the active materials to be released from the nanoparticles composed of said material.
- the particles thus covered with a crown of PEG manifest a prolonged circulation in the blood.
- copolymers constituting the claimed material can be in the form of di- or multi-block copolymers, have a structure of the linear, branched or crosslinked type.
- crosslinked reference is made to polymers forming a three-dimensional network as opposed to simplified linear polymers.
- the chains are connected to each other by covalent or ionic bonds and become insoluble.
- Diblock or multiblock copolymers can be obtained by varying the oligosaccharide / biodegradable polymer molar ratio during synthesis.
- the crosslinked structure copolymers can be obtained from biodegradable polymers comprising at least two reactive functions.
- the second aspect of the present invention relates to a process for preparing the claimed material.
- this method comprises bringing together at least one molecule of a biodegradable polymer or one of its derivatives carrying at least one reactive function, with at least one molecule of a cyclic oligosaccharide, under suitable conditions to the formation of a covalent bond between the two types of molecules and in that said material is recovered.
- the claimed preparation process does not require the use of a catalyst like the conventional processes for direct polymerization of monomers on the backbones of oligo- or polysaccharides. This specificity of the claimed process is therefore particularly advantageous in terms of safety and biodegradability in the resulting material.
- the reactive function present on the biodegradable polymer is an activated carboxylic acid function.
- the oligosaccharide, more preferably a cyclodextrin, and the suitably activated biodegradable polymer are brought into contact in a mass ratio varying from 2: 98 to 40: 60.
- the ester bond between the cyclic oligosaccharides and the polyesters is carried out either by passing through an activated ester of the acid function (esterification with NHSl in the presence of dicyclohexylcarbodiimide (DCC)), which is then isolated, or by passing through a non-isolated intermediate ( activation with carbonyidiimidazole (CDI)).
- DCC dicyclohexylcarbodiimide
- CDI carbonyidiimidazole
- the biodegradable polymers meet the definitions proposed above.
- they can be derived from molecules of biodegradable polymers, natural or synthetic, and which have been modified so as to be functionalized in accordance with the present invention.
- a third aspect of the invention relates to particles made of a material according to the invention.
- the claimed particles can have a size between 50 nm and 500 ⁇ m and preferably between 80 nm and 100 ⁇ m.
- the size of the particles can be fixed.
- the particles have a size between 1 and 1000 nm and are then called nanoparticles.
- Particles varying in size from 1 to several thousand microns refer to microparticles.
- the claimed nanoparticles or microparticles can be prepared according to methods already described in the literature, such as for example the solvent emulsion / evaporation technique [R. Gumy et al. "Development of biodegradable and injectable latices for controlled release of potent drugs” Drug Dev. Ind. Pharm., Vol 7, p.
- the so-called “double-emulsion” technique which is advantageous for the encapsulation of hydrophilic active principles, consists in dissolving these in an aqueous phase, in forming an emulsion of the water / oil type with an organic phase containing the polymer. , then to form an emulsion of the water / oil / water type using a new aqueous phase containing a surfactant. After evaporation of the organic solvent, nano- or micro-spheres are recovered.
- the material according to the present invention has the major advantage of having surfactant properties, due to its amphiphilic nature. These properties can therefore be exploited advantageously during the preparation of particles, for example, so as to avoid the use of surfactants, systematically used in the above-mentioned processes. Indeed, these are not always biocompatible and are difficult to remove at the end of the process.
- biodegradable polymer / oligosaccharide and / or mass ratio - molar masses (block sizes) of the biodegradable polymers and of the oligosaccharides considered.
- particles from mixtures of two or more types of materials according to the present invention.
- the particle structures obtainable from the material according to the invention and the abovementioned methods can be variable.
- the cyclic oligosaccharide can be available either exclusively at the inclusions aqueous, either at the level of these inclusions and at the surface of the particles.
- certain encapsulated sensitive active principles proteins, peptides, etc.
- proteins, peptides, etc. can be protected from interactions, often denaturing, with the hydrophobic biodegradable polymer and the organic solvent;
- hydrophilic core type structure cyclic oligosaccharide
- hydrophobic crown biodegradable polymer
- micellar structure obtained by the self-association of a material in accordance with the invention in the aqueous phase
- the particles preferably degrade over a period of between one hour and several weeks.
- the particles according to the invention may contain an active substance.
- This substance can be hydrophilic, hydrophobic or amphiphilic in nature and biologically active.
- biological active materials mention may more particularly be made of peptides, proteins, carbohydrates, nucleic acids, lipids, polysaccharides or their mixtures. They can also be synthetic or natural organic or inorganic molecules which, administered in vivo to an animal or to a patient, are capable of inducing a biological effect and / or manifesting therapeutic activity. It can thus be antigens, enzymes, hormones, receptors, peptides, vitamins, minerals and / or steroids.
- medicaments which can be incorporated into these particles, mention may in particular be made of molsidomine, ketoconazole, gliclazide, diclofenac, levonorgestrel, paclitaxel, hydrocortisone, pancratistatin, ketoprofen, diazepam, ibuprofen, nifedipine, testosterone, tamoxifen, furosemide, tolbutamide, chloramphenicol, benzodiazepine, naproxene, dexamethasone, diflunisal, anadamide, pilocarpine, daunorubicin and doxoriazicine.
- the particles can thus include magnetic particles, radio-opaque materials (such as air or barium) or fluorescent compounds.
- fluorescent compounds such as rhodamine or Nile red can be included in particles with a hydrophobic core.
- gamma emitters for example Indium or Technetium
- Hydrophilic fluorescent compounds can also be encapsulated in the particles, but with a lower yield compared to hydrophobic compounds, due to the lower affinity with the matrix.
- Commercial magnetic particles with controlled surface properties can also be incorporated into the particle matrix or covalently attached to one of their constituents.
- the active material can be incorporated into these particles during their formation process or, on the contrary, be loaded at the level of the particles once they are obtained.
- the particles in accordance with the invention can comprise up to 95% by weight of an active material.
- the active ingredient can thus be present in an amount varying from 0.001 to 990 mg / g of particle and preferably from 0.1 to 500 mg / g.
- the particles according to the invention can be administered in different ways, for example by the oral, parenteral, ocular, pulmonary, nasal, vaginal, cutaneous, buccal routes, etc.
- the non-invasive oral route is a preferred route.
- particles administered orally can undergo different processes: translocation (capture and then passage of the digestive epithelium by intact particles), bioadhesion (immobilization of particles on the surface of the mucosa by an adhesion mechanism) and transit.
- translocation capture and then passage of the digestive epithelium by intact particles
- bioadhesion immobilization of particles on the surface of the mucosa by an adhesion mechanism
- transit for these first two phenomena, the surface properties play a major role.
- the particles further comprise at least one molecule covalently or non-covalently linked to their surface.
- certain particles according to the invention have numerous free hydroxyl functions on the surface, proves to be particularly advantageous for binding a biologically active molecule thereof, intended for targeting or detectable. It is thus possible to envisage functionalizing the surface of these particles so as to modify their surface properties and / or target them more specifically to certain tissues or organs.
- the particles thus functionalized can be maintained at the target level by the use of a magnetic field, during medical imaging or while an active compound is released.
- targeting molecule type ligands such as receptors, lectins, antibodies or fragments thereof can be attached to the surface of the particles. This type of functionalization falls within the competence of a person skilled in the art.
- the coupling of these ligands or molecules to the surface of the particles is carried out either covalently by attaching the ligand to the oligosaccharide covering the particles or non-covalently, that is to say by affinity.
- certain lectins may be attached by specific affinity to the oligosaccharides located on the surface of particles according to the present invention, thereby enhancing the cell recognition properties of these particles.
- the ligand can be carried by another polymer used in the composition of the particles. This aspect was mentioned previously.
- the invention also relates to the use of the particles obtained according to the invention for encapsulating one or more active materials as defined above.
- compositions comprising particles of the invention preferably associated with at least one pharmaceutically acceptable and compatible vehicle.
- the particles can be administered in gastro capsules resistant, or incorporated into gels, implants or tablets. They can also be prepared directly in an oil (such as Migliol®) and this suspension administered in a capsule or injected at a specific site (for example tumor).
- oils such as Migliol®
- These particles are in particular useful as stealth vectors, that is to say capable of escaping the immune defense system of the organism and / or as bioadhesive vectors.
- Figure 1 Schematic representations of different conformational structures of the materials according to the invention.
- Figure 2 Chromatogram of the product of the reaction of ⁇ cyclodextrin with the polyester PCL-diacid (H0 2 C-PCL-C0 2 H).
- the acid and ⁇ -caprolactone were introduced into a flask surmounted by an ascending condenser. After a severe purging of the reagents, the flask was introduced into an oil bath thermostatically controlled at 235 ° C. The reaction continued for 6 h 30 min under an inert atmosphere (argon). It was stopped by immersion of the balloon in ice. The solid obtained was hot dissolved in 15 ml THF, then was precipitated at room temperature with cold methanol.
- Mn number-average molar masses
- Mw number-average molar masses
- CES steric exclusion chromatography
- a number average molar mass equal to 3200 g / mole was determined by titration with a 10 "2 M KOH / EtOH solution of the polymer samples of approximately 100 mg dissolved in an acetone-water mixture.
- the bifunctionalized polymer HOOC-PCL-COOH was synthesized according to the procedure of Example 1.
- the succinic acid (99.9%, Aldrich) used as initiator was dried under vacuum at 110 ° C for 24 hours.
- the monomer ( ⁇ -caprolactone) was freshly purified by distillation on calcium hydride, under reduced pressure.
- the whole is heated to 140 ° C. under argon for 3 hours.
- the DMSO is evaporated and then the crude reaction product dissolved in 500 ml of chloroform.
- This solution is introduced into a 5 2 liter separatory funnel and stirred with 1 liter of water.
- the aqueous phase is in the form of a stable emulsion.
- This emulsion is broken by evaporation with Rotovap®.
- the polymer is obtained in the form of a precipitate. Subsequently, this precipitate is again washed with water, then recovered by filtration, washed with ether and dried. The yield is 75% by weight.
- the copolymer is characterized by gel permeation chromatography (refractometer and viscometer detectors) using a Visco Gel column (GMHHR-N, Viscotek, GB, heated to 60 ° C), calibrated with polystyrene standards (calibration universal).
- the copolymer is dissolved in N, N-dimethyl acetamide (DMAC) at a concentration of 5 mg / ml.
- the volume injected is 100 ⁇ l.
- the eluent is DMAC containing 0.5% lithium bromide, at a flow rate of 0.5 ml / min.
- the chromatogram ( Figure 2) shows that it is a unique product, with some traces of unreacted ⁇ CD.
- the number-average molar mass o is 8,330 g / mole and the weight-average molar mass is 10,790 g / mole.
- This copolymer contains approximately 35% by weight of ⁇ CD.
- a 20 ⁇ g / ml tamoxifen solution is prepared from tamoxifen base (Sigma, France) and tritiated tamoxifen (specific activity 80 Ci / mole, ethanolic solution 5.2 mCi / ml, Perkin Elmer, EU) so as to obtain a 3 H isotopic dilution of tamoxifen / tamoxifen base equal to 1 / 170,000 (mole / mole).
- the base tamoxifen (powder) and tritiated (ethanolic solution) are dissolved in a minimum volume of ethanol.
- the ethanol is then evaporated under a stream of nitrogen.
- the residue thus obtained is dissolved in ultrapure water (Milli Q) by stirring at room temperature for 18 h.
- the radioactivity in the supernatant is determined by counting in liquid scintillation the tritiated tamoxifen (Beckman counter LS-6000-TA, EU). For this, 200 ⁇ l of supernatant is mixed with 4 ml of Ultimagold TM scintillation liquid (Packard, Netherlands). For each of the two samples prepared, two independent measurements are made and the average of the four measurements is calculated.
- the radioactivity in the supernatants corresponds to a concentration of 6.25 ⁇ 0.13 ⁇ g / ml in tamoxifen.
- the material according to the invention allows the incorporation of a high amount of tamoxifen, a compound which is particularly difficult to incorporate. Furthermore, it is noted that the radioactivity values measured in the supernatants of the two samples produced are very close, which shows that the incorporation into the material according to the invention is carried out in a reproducible manner.
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Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003530753A JP2005503476A (ja) | 2001-09-27 | 2002-09-27 | 生分解可能ポリマーおよびシクロデキストリン含有材料 |
| CA002461421A CA2461421A1 (fr) | 2001-09-27 | 2002-09-27 | Materiau compose d'au moins un polymere biodegradable et de cyclodextrines |
| US10/490,417 US20050043481A1 (en) | 2001-09-27 | 2002-09-27 | Material consisting of at least a biodegradable polymer and cyclodextrins |
| EP02781387A EP1440114A1 (fr) | 2001-09-27 | 2002-09-27 | Materiau compose d'au moins un polymere biodegradable et de cyclodextrines |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0112456A FR2830017B1 (fr) | 2001-09-27 | 2001-09-27 | Materiau compose d'au moins un polymere biodegradable et de cyclodextrines |
| FR01/12456 | 2001-09-27 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2003027169A1 true WO2003027169A1 (fr) | 2003-04-03 |
Family
ID=8867681
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/FR2002/003321 Ceased WO2003027169A1 (fr) | 2001-09-27 | 2002-09-27 | Materiau compose d'au moins un polymere biodegradable et de cyclodextrines |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US20050043481A1 (fr) |
| EP (1) | EP1440114A1 (fr) |
| JP (1) | JP2005503476A (fr) |
| CA (1) | CA2461421A1 (fr) |
| FR (1) | FR2830017B1 (fr) |
| WO (1) | WO2003027169A1 (fr) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006128937A2 (fr) | 2005-06-02 | 2006-12-07 | Universidade De Santiago De Compostela | Nanoparticules qui contiennent du chitosane et de la cyclodextrine |
| WO2007082897A3 (fr) * | 2006-01-17 | 2008-01-31 | Braun Melsungen Ag | Produits d'addition polysaccharide-cyclodextrine |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005320469A (ja) * | 2004-05-11 | 2005-11-17 | Idemitsu Kosan Co Ltd | ポリカーボネート樹脂組成物及び成形品 |
| EA013433B1 (ru) * | 2005-02-15 | 2010-04-30 | Элан Фарма Интернэшнл Лтд. | Аэрозольные и впрыскиваемые рецептуры лекарственных препаратов бензодиазепина, состоящего из наночастиц |
| WO2007112274A2 (fr) * | 2006-03-28 | 2007-10-04 | Javelin Pharmaceuticals, Inc. | Formulations de médicaments anti-inflammatoires non stéroïdiens à faible dose et bêta-cyclodextrine |
| CA2647348A1 (fr) * | 2006-03-28 | 2007-10-04 | Javelin Pharmaceuticals, Inc. | Formulations de diclofenac et de cyclodextrine beta a faible dosage |
| ES2310122B1 (es) * | 2007-04-20 | 2009-10-30 | Instituto Cientifico Y Tecnologico De Navarra, S.A | Nanoparticulas que comprenden una ciclodextrina y una molecula biologicamente activa y sus aplicaciones. |
| ITMI20071173A1 (it) * | 2007-06-11 | 2008-12-12 | Univ Degli Studi Milano | Polimeri iperramificati a base di ciclodestrine e poli(amidoammine) per il rilascio controllato di farmaci insolubili |
| WO2009032199A1 (fr) * | 2007-08-31 | 2009-03-12 | The Board Of Trustees Operating | Β-cyclodextrines comme agents de nucléation pour le poly(acide lactique) |
| PE20091265A1 (es) * | 2007-12-13 | 2009-09-18 | Univ Kyushu Nat Univ Corp | Nanoparticulas que contienen pioglitazona |
| WO2010146875A1 (fr) | 2009-06-18 | 2010-12-23 | オーミケンシ株式会社 | Fibres contenant de l'iode et de l'amylase, leur procédé de production et leur utilisation |
| EP2937087B1 (fr) * | 2012-12-21 | 2021-02-24 | SENTAN Pharma Inc. | Composition et aliment ou boisson |
| US20200251341A1 (en) * | 2015-11-27 | 2020-08-06 | Sharp Kabushiki Kaisha | Wet-etching method and method of producing semiconductor device |
| CN112126075B (zh) * | 2020-09-23 | 2022-06-07 | 兰州大学第二医院 | 一种可降解的形状记忆聚合物及其制备方法、4d打印可降解下肢血管支架及其制备方法 |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5321064A (en) * | 1992-05-12 | 1994-06-14 | Regents Of The University Of Minnesota | Compositions of biodegradable natural and synthetic polymers |
| US5543158A (en) * | 1993-07-23 | 1996-08-06 | Massachusetts Institute Of Technology | Biodegradable injectable nanoparticles |
| WO1998026662A1 (fr) * | 1996-12-19 | 1998-06-25 | The Penn State Research Foundation | Composes et methodes pour traiter et prevenir les maladies bacteriennes et virales |
| US5849839A (en) * | 1990-10-15 | 1998-12-15 | Board Of Regents, The University Of Texas System | Multifunctional organic polymers |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2732026B1 (fr) * | 1995-03-21 | 1997-06-06 | Roquette Freres | Procede pour ameliorer la compatibilite reciproque de polymeres |
| US6613703B1 (en) * | 2000-04-27 | 2003-09-02 | Kimberly-Clark Worldwide, Inc. | Thermoplastic nonwoven web chemically reacted with a cyclodextrin compound |
-
2001
- 2001-09-27 FR FR0112456A patent/FR2830017B1/fr not_active Expired - Fee Related
-
2002
- 2002-09-27 WO PCT/FR2002/003321 patent/WO2003027169A1/fr not_active Ceased
- 2002-09-27 US US10/490,417 patent/US20050043481A1/en not_active Abandoned
- 2002-09-27 CA CA002461421A patent/CA2461421A1/fr not_active Abandoned
- 2002-09-27 EP EP02781387A patent/EP1440114A1/fr not_active Withdrawn
- 2002-09-27 JP JP2003530753A patent/JP2005503476A/ja active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5849839A (en) * | 1990-10-15 | 1998-12-15 | Board Of Regents, The University Of Texas System | Multifunctional organic polymers |
| US5321064A (en) * | 1992-05-12 | 1994-06-14 | Regents Of The University Of Minnesota | Compositions of biodegradable natural and synthetic polymers |
| US5543158A (en) * | 1993-07-23 | 1996-08-06 | Massachusetts Institute Of Technology | Biodegradable injectable nanoparticles |
| WO1998026662A1 (fr) * | 1996-12-19 | 1998-06-25 | The Penn State Research Foundation | Composes et methodes pour traiter et prevenir les maladies bacteriennes et virales |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006128937A2 (fr) | 2005-06-02 | 2006-12-07 | Universidade De Santiago De Compostela | Nanoparticules qui contiennent du chitosane et de la cyclodextrine |
| WO2007082897A3 (fr) * | 2006-01-17 | 2008-01-31 | Braun Melsungen Ag | Produits d'addition polysaccharide-cyclodextrine |
Also Published As
| Publication number | Publication date |
|---|---|
| US20050043481A1 (en) | 2005-02-24 |
| JP2005503476A (ja) | 2005-02-03 |
| FR2830017B1 (fr) | 2005-11-04 |
| CA2461421A1 (fr) | 2003-04-03 |
| FR2830017A1 (fr) | 2003-03-28 |
| EP1440114A1 (fr) | 2004-07-28 |
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