WO2009095562A2 - Biomateriau permettant la delivrance controlee d'actifs - Google Patents
Biomateriau permettant la delivrance controlee d'actifs Download PDFInfo
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- WO2009095562A2 WO2009095562A2 PCT/FR2008/001596 FR2008001596W WO2009095562A2 WO 2009095562 A2 WO2009095562 A2 WO 2009095562A2 FR 2008001596 W FR2008001596 W FR 2008001596W WO 2009095562 A2 WO2009095562 A2 WO 2009095562A2
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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- 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
- A61K47/30—Macromolecular organic or inorganic compounds, e.g. inorganic polyphosphates
- A61K47/42—Proteins; Polypeptides; Degradation products thereof; Derivatives thereof, e.g. albumin, gelatin or zein
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- A61K47/30—Macromolecular organic or inorganic compounds, e.g. inorganic polyphosphates
- A61K47/36—Polysaccharides; Derivatives thereof, e.g. gums, starch, alginate, dextrin, hyaluronic acid, chitosan, inulin, agar or pectin
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Definitions
- the present invention relates to a biomaterial comprising an aqueous phase, a polymer network, a second polymer induced in the network and at least one degradation enzyme of the second polymer.
- the present invention also relates to a process for preparing said biomaterial.
- the present invention relates to uses of the biomaterial, in particular for the release of active substances and to a controlled release device for active substances comprising the biomaterial.
- the biomaterial of the invention finds particular applications in the cosmetic and pharmaceutical fields.
- Gels are used because of their particular properties in many fields, in particular food, cosmetics or pharmaceuticals.
- a gel is composed of at least two components of which one, very strongly, corresponds to a liquid solvent and the other is a component that can be described as solid. Both components are continuous throughout the medium.
- the so-called solid phase constitutes a network that traps the so-called liquid phase corresponding to the solvent, and prevents it from flowing.
- the whole medium behaves like a soft and elastic solid easy to deform.
- Gels are classifiable according to the type of links that form the network. Thus two major gelling mechanisms are distinguished which lead to "physical" gels or "chemical” gels.
- gel formation is the result of the formation of a continuous solid network. This transformation is called the solution / gel transition.
- a physical gel is a supramolecular assembly consisting of molecules linked together by low energy bonds (Van der Waals, hydrogen bonds, polar bonds, etc.).
- the stability of this assembly is associated with a precise range of physico-chemical conditions (pH, concentration in molecules, temperature, quality of the solvent, ionic strength, etc.). Outside this range, the mixture is liquid.
- the sol / gel transition is therefore reversible for physical gels.
- a modification of the environmental parameters can lead to the destruction of the building and induce a freeze-soil transition.
- Biogels are obtained essentially from macromolecules or polymers of natural origin: proteins or polysaccharides.
- a chemical gel corresponds to a supramolecular assembly whose molecules are associated by high energy (covalent) bonds. The stability of this assembly is very large. These chemical gels have improved stability, the only way to perform a gel / solution transition is to destroy the covalent bonds of the network. This is why the ground / gel transition of chemical gels is called irreversible.
- a family of chemical gels corresponds to enzymatically catalyzed gels. This mode of gelation is mainly observed in large biological processes. Blood coagulation, scarring, skin formation, extracellular matrix assembly are biological processes where the passage of soluble proteins to the gel state is indispensable. In vivo, a limited number of enzymes, for example lysyloxidases, transglutaminases, catalyze these reactions. In vitro, the most commonly used is transglutaminase which creates covalent bridges between the side chains of lysine and glutamine residues of proteins.
- Tgases thus catalyze the polymerization of the proteins responsible for the formation of biological gelled networks.
- This family of proteins is ubiquitous and is found in both prokaryotes and eukaryotes.
- Tgases make it possible to obtain gels from numerous proteins in the food industry, and in particular for the manufacture of surimi or the hardening of many meat derivatives (ham, reconstituted food, etc.). Mention may be made, as examples of polymerizable proteins, of gelatin, fibrin, gliadin, myosin, globulin (7S and 11S), actin, myoglobin, whey proteins, in particular caseins and lactaglobulin, soy protein, wheat and especially glutenin, yellow and egg white, including ovalbumin.
- gelatin gel is obtained from collagen which is a structural protein. Collagen is a molecule organized in triple helix. These triple helices can associate in fibrils which can associate in fibers. The collagen triple helix is unstable at body temperature. Gelatin is obtained by denaturation of collagen. Tissues containing collagen thus undergo acid or alkaline treatment, which results in the denaturation of the collagen triple helix. The possibility of making fibers is then totally lost. Acidic treatment results in the formation of type A gelatin and an alkaline treatment with type B gelatin. The gelatin solution is therefore composed of isolated chains of collagen.
- gelatin gels As the uses of gelatin are multiple, it is sometimes necessary to create gelatin gels under conditions where physical gels do not exist (high temperatures, extreme pH or particular ionic strength). To form the network necessary for freezing, the chains gelatin are then bridged by covalent bonds, and especially by the action of the Tgases. The gels thus obtained are chemical gels.
- the analysis of living revealed the existence of extremely dynamic systems.
- the cells interact with a structure called the extracellular matrix (MEC) 1 which is rich in proteins and similar to a gel at the macroscopic level.
- MEC extracellular matrix
- This structure is mainly located under the epithelial cells and around the connective tissues.
- the cells can synthesize different components of the extracellular matrix such as collagen which confers its rigidity to the MEC or fibronectin which is involved in the mechanisms of cell adhesion.
- the cell also produces proteases that cause degradation of the extracellular matrix.
- the cell therefore intervenes simultaneously in the construction and degradation of the extracellular matrix.
- the structure of the extracellular matrix is thus not an irreversible and static structure but corresponds to a dynamic equilibrium resulting from the balance between the construction and degradation activities of the proteins synthesized by the cell.
- the clots formed according to the blood clotting mechanism also constitute dynamic systems.
- a clot is formed from soluble proteins organized in an insoluble network. This clot will then be removed during another enzymatic reaction.
- protein networks combine to become insoluble and form gels, which can be likened to solution / gel transitions.
- the protein networks are also destroyed by the action of proteases, this type of transition can this time be likened to gel / solution transitions.
- proteases this type of transition can this time be likened to gel / solution transitions.
- the solution / gel transition in these biological processes is most often associated with the transglutaminase family mentioned above.
- the opposite transition, namely gel / solution, is associated with the antagonistic activity of proteolytic-type enzymes.
- MMP matrix metalloproteinases
- serine proteases such as trypsin, matriptase, cysteines and aspartate proteases, such as cathepsins B and L and cathepsins D and G, metalloproteases and ADAM family.
- Gels having the solution / gel and gel / solution transition capacity are described in WO 2006/056700. These gels comprise an aqueous phase, a polymer and enzymes capable of degrading the polymer and of polymerizing monomers to form said polymer. .
- the "monomers” may be biological or polymeric macromolecules.
- the term "polymer” applies to a "polymer network”.
- the gels of the state of the art have programmed gelling and resolubilization kinetics. Furthermore, the gels of the state of the art have controlled physical characteristics, for example their viscoelasticity. In addition, the physical characteristics of the solid network and the aqueous phase forming the gels of the state of the art are modified indissociable and simultaneous. These disadvantages limit the scope of these gels because of their physical characteristics. It is for example impossible, according to the state of the art, to modify the solid network without modifying the aqueous phase or to modify the aqueous phase without modifying the solid gel network.
- the invention specifically makes it possible to meet these needs of the prior art and to overcome these disadvantages by providing a biomaterial in which the viscoelastic properties of the gel can be modified and in which the modification of these properties is programmed.
- the subject of the present invention is in particular a biomaterial comprising an aqueous phase and a first polymer network constituted by a first protein or saccharide polymer or a mixture of first protein and / or saccharide polymers, in which the first polymer network and the aqueous phase form a first gel (A), the biomaterial comprising:
- a second protein or saccharide polymer or a mixture of second protein or saccharide polymers is in solution in the aqueous phase of the gel (A), either in the form of a second polymer network constituting a gel (B),
- polymer is understood to mean an association of molecules. This association between the molecules can be ensured by strong or weak interactions (covalent bonds, hydrogen bonds, Van der Waals, etc.). In the case of covalent bonds, the association is a crosslinking and the network is said to be "crosslinked".
- polymer is meant a macromolecule, for example a protein or saccharide polymer.
- a polymer network is a combination of protein polymers or a combination of saccharide polymers.
- the polymer network can be a gel.
- aqueous phase is understood to mean an aqueous solution, for example water, for example still an aqueous buffered solution, for example at a desired pH, for example by means of a phosphate buffer or Tris or any suitable buffer known to those skilled in the art as a buffer. It may be, for example, a medium allowing the activity of the enzyme (s) present in the biomaterial.
- the first polymer network may consist of a first protein polymer.
- This first protein polymer may be chosen for example from the group comprising fibrin, gliadin, myosin, globulin (7S and 11S), actin, myoglobin, collagen and its derivatives, milk proteins, soy protein, wheat protein, and egg yolk and egg white protein, pea protein, faba bean protein, flax protein, silk protein, fibronectin, laminin, elastin , vitronectin, or a mixture of these polymers.
- This first polymer network may therefore consist of a single first protein polymer or a mixture of first protein polymers.
- the first polymer network may consist of a first saccharide polymer.
- This first saccharide polymer may be chosen, for example, from the group comprising carrageenans, alginates, xanthan, chitosan, chitin, hyaluronic acid, sulphated glycosaminoglycans, glycogen and cellulose. and its derivatives, pectins, starch and derivatives thereof, dextrans and xylans, or a mixture thereof.
- This first polymer network can therefore consist of a single first saccharide polymer or a mixture of first saccharide polymers.
- the first polymer network may also consist of a mixture of first protein and saccharide polymers, chosen for example from the abovementioned groups of protein and saccharide polymers.
- the first polymer network may be chosen for example from the group comprising gelatin, fibrin and alginate gels, it being understood that this first polymer network consists of polymers that are different from the second polymers.
- the quantity of the first polymer network or mixture of first polymers may for example be between 0.1 and 20% by weight relative to the total weight of the biomaterial, preferably from 0.5 to 10% by weight. weight.
- the second polymer is different from the polymer constituting the first polymer network.
- This second polymer may be chosen for example from the group comprising fibrin, gliadin, myosin, globulin (7S and 11S), actin, myoglobin, collagen and its derivatives, milk proteins, proteins soybeans, wheat proteins, and yolk and egg white proteins, pea proteins, faba bean proteins, Nn proteins, silk proteins, fibronectin, laminin, elastin, vitronectin, or a mixture of these polymers.
- This second polymer may therefore consist of a single protein polymer or a mixture of protein polymers.
- the second polymer may be chosen for example from the group comprising, for example, carrageenans, alginates, xanthan, chitosan, chitin, hyaluronic acid, sulphated glycosaminoglycans, glycogen, cellulose and its derivatives, pectins, starch and its derivatives, dextrans and xylans, or mixture of these.
- This second polymer may therefore consist of a single saccharide polymer or a mixture of saccharide polymers.
- the second polymer may also consist of a mixture of second protein polymers and second saccharide polymers, for example chosen from the abovementioned groups of protein and saccharide polymers.
- the second polymer may be chosen for example from the group comprising gelatin, fibrin, hyaluronic acid and alginate, it being understood that this second polymer is different from the first.
- the amount of the second polymer or mixture of second polymers may be between 0.01 and 20% by weight relative to the total weight of the biomaterial, preferably from 0.1 to 10% by weight.
- the first enzyme may be chosen for example from the group comprising the enzymes of the metalloproteinase family, the family of serine proteases, the family of cysteines and aspartate proteases, the ADAM family, glycosidases including amylase. cellulase, dextranase, pullulanase, pectinase, chitinase, xanthanase, chitosanase, hyaluronidase, and lyases including hydroxyacetyl lyase, chondroitinase, heparinase, alginate lyase.
- the concentration in the biomaterial of the first enzyme may be between 2 ⁇ 10 7 and 50 U / ml, preferably from 2 ⁇ 10 -6 to 20 U / ml.
- the biomaterial may further comprise a second enzyme different from the first enzyme and capable of degrading the first polymer network, said first polymer network being capable of performing, under the action of said second enzyme, a gel transition (A) / solution.
- the second enzyme can be chosen for example from the group comprising the enzymes of the metalloproteinase family, the family of serine proteases, the family of cysteines and aspartate proteases, the ADAM family. , glycosidases including amylase, cellulase, dextranase, pullulanase, pectinase, chitinase, xanthanase, chitosanase, hyaluronidase, and lyases including hydroxyacetyl lyase, chondroitinase, heparinase, and alginate lyase.
- glycosidases including amylase, cellulase, dextranase, pullulanase, pectinase, chitinase, xanthanase, chitosanase, hyaluronidase, and lyases
- the concentration in the biomaterial of the second enzyme can be between 2 ⁇ 10 7 and 50 U / ml, preferably from 2 ⁇ 10 7 to 20 U / ml.
- the biomaterial may furthermore comprise a third enzyme different from the first and second enzymes and capable of inducing bonds between said first polymers or a mixture of first polymers, said third enzyme being capable of catalyzing a solution / gel transition ( AT).
- a third enzyme different from the first and second enzymes and capable of inducing bonds between said first polymers or a mixture of first polymers, said third enzyme being capable of catalyzing a solution / gel transition ( AT).
- the third enzyme may be chosen for example from the group comprising lysyl oxidase, transglutaminases, disulfide isomerase proteins, sulfhydrile thiol oxidases, peroxidases, lipoxygenases, epimerases including alginates epimerases, glucuronate isomerases, cellobiose epimerase and galactose-6-sulfurylases.
- the concentration in the biomaterial of the third enzyme may be between 0.01 and 50 U / ml, preferably from 0.1 to 5 U / ml.
- the biomaterial may further comprise a fourth enzyme different from the first, second and third enzymes and capable of inducing bonds between said second polymers or mixture of second polymers, said fourth enzyme being capable of catalyzing a solution / gel transition (B).
- a fourth enzyme different from the first, second and third enzymes and capable of inducing bonds between said second polymers or mixture of second polymers, said fourth enzyme being capable of catalyzing a solution / gel transition (B).
- the fourth enzyme may be chosen for example from the group comprising lysyl oxidase, transglutaminases, disulfide isomerase proteins, sulfhydrile thiol oxidases, peroxidases, lipoxygenases, epimerases including alginates epimerases, glucuronate isomerases cellobiose epimerase and galactose-6-sulfurylases.
- the concentration in the biomaterial of the fourth enzyme can be between 0.01 and 50 U / ml, preferably from 0.1 to 5 U / ml.
- the first, second, third and fourth enzymes are enzymes that can be independently active or activatable
- the aqueous phase of the biomaterial may further comprise an active substance.
- This active substance may for example be in solution in the aqueous phase of the gel (A) and / or in the gel (B).
- the term "active substance” is intended to mean any substance or composition having a biological or biochemical activity on the surface of an organism (microorganism or multicellular organism, for example skin, bone, organ, etc.) or in an organism .
- This active substance may have, for example, curative or preventive properties with regard to human or animal diseases. It can be any product that can be administered to humans or animals in order to establish a medical diagnosis or to restore, correct or modify their organic functions. It may be bacteriostatic and / or bactericidal substances, antibiotics, sanitizers, dyes, etc.
- the active substance may be chosen for example from the group comprising, bacteriostats, bactericides, vasodilators, dyes including eosin, blue dextran, methylene blue, azur, proteins, saccharides including hyaluronic acid and alginates, a liposome, a nanoparticle, a micelle, anti-acne, antiallergics, anxiolytics, antiasthmatics, anticancer drugs, lipid-lowering drugs, hormonal contraceptives, anti-depressants, antidiabetics, analgesics, anti-asthenics, antihypertensives, antifungals, antibiotics, sleeping pills, hormonal treatments, anti-migraine medicines, overweight drugs, anti-Parkinson's, neuroleptics, anti-inflammatory drugs non-steroidal inflammatory drugs, ovulation inducers, bronchial fluidifiers, antitussives, estrient inducers and antiulcer agents.
- it may be an active substance alone or a mixture of active substances.
- the amount of active substance may depend, for example, on factors such as its activity and the dose desired by the user.
- the desired dose can be easily determined by those skilled in the art since they may be for example known doses for known products.
- the biomaterial of the present invention can therefore be used for the controlled release of at least one active substance.
- the invention also relates to a method for preparing a biomaterial as described above comprising the following steps: a) forming in aqueous phase a first polymer network consisting of a first protein or saccharide polymer or a mixture of first protein or saccharide polymers, the first protein or saccharide polymer or mixture of first protein or saccharide polymers forming said first polymer network, b) adding a second protein or saccharide polymer or a mixture of second protein or saccharide polymers, different from the first polymer or mixture of first polymers, the addition step being carried out before the formation of the first polymer network.
- the process of the invention can be carried out, for example, with second polymers or a mixture of second polymers included in the aqueous phase of the network of first polymers.
- the process of the invention can be carried out with second polymers or a mixture of second polymers forming, for example, an array of second polymers included in the network of first polymers.
- the formation or degradation of the various polymers or polymer network can be induced by the addition of one to four enzymes in step b).
- concentration of these different enzymes may allow, for example, the control of the viscoelastic properties of the biomaterial of the invention.
- the process of the invention can be carried out for example at a temperature of between 10 and 45 ° C.
- the first and second polymers are as defined above.
- the concentration of the first and / or second polymers may also be as previously described.
- the method may further comprise in step b) the addition of a first enzyme capable of degrading said second polymers or the second polymer network.
- the first enzyme is defined above. Its quantity is defined above.
- the method may further comprise in step b) the addition of a second enzyme capable of degrading the bonds of the first polymer network.
- the second enzyme is defined above. Its quantity is defined above.
- the process may further comprise in step b) the addition of a third enzyme capable of inducing bonds between said first polymers.
- the third enzyme is defined above. Its quantity is defined above.
- the method may further comprise in step b) the addition of a fourth enzyme capable of inducing bonds between said second polymers.
- the fourth enzyme is defined above. Its quantity is defined above.
- the method may further comprise in step b) the addition of at least one active substance.
- the active substance is defined above.
- the method may further comprise a step c) of lyophilization of the biomaterial.
- a step c) of lyophilization of the biomaterial According to the invention, it can also be a dehydration step.
- the invention also relates to a device for controlled release of an active substance comprising the biomaterial of the present invention.
- the release device can be chosen for example from the group comprising medical devices including contact lenses, electrodes, sensors, devices for care, dressings, soaked compresses, bandages, medical devices, surgical dressings, ophthalmic dressings, dental dressings, suture products, devices for therapies, orthopedic articles, surgical implants, patches, transdermal gels, active patches, stents and implants for soft tissues, devices for tissue engineering, reconstruction materials, devices for cell culture, media culture media.
- the biomaterial of the present invention may, for example, partially or totally replace the material used in the aforementioned devices, especially the material in contact with the skin, mucous membranes, organs, bones, cells, etc.
- the biomaterial according to the invention can thus make it possible to produce new cosmetics such as patches or beauty masks that can release a substance, for example a substance that promotes the well-being of the user or a cosmetic active agent, for example hyaluronic acid or retinol.
- a substance for example a substance that promotes the well-being of the user or a cosmetic active agent, for example hyaluronic acid or retinol.
- the biomaterial according to the invention may also make it possible to obtain gels that trap an active principle and capable of releasing said active ingredient by returning to the state of solution with a specific kinetics, for example gels or capsules releasing the active ingredient after a given time.
- FIG. 1 represents the evolution of the release of Eosin over time in a biomaterial according to the invention
- the arrow represents the resolubilization time of the gel comprising collagenase.
- FIG. 2 represents the percentage of dextran blue salting as a function of time in a biomaterial according to the invention.
- FIG. 3 represents the influence of the degradation of hyaluronic acid (1%) on the viscoelasticity (G ': squares, G ": triangles) of the physical gel at a given frequency (6.3 rad.s " 1 ) as a function of time in minutes.
- 1 U / mL of hyaluronidase black symbols
- 5 U / mL of hyaluronidase dark gray symbols
- 10 U / mL of hyaluronidase light gray symbols
- gelatin alone white symbols
- FIG. 4 represents the influence of the degradation of hyaluronic acid (1%) on the formation of triple helices of the physical gel as a function of time in minutes.
- 1 U / mL Hyaluronidase white symbols
- no enzyme black symbols
- gelatin alone gelatin alone
- FIG. 5 represents the influence of the degradation of hyaluronic acid (1%) on the viscoelasticity (G ': squares, G ": triangles) of the chemical gel at a given frequency (6.3 rad.s " 1 ) as a function of time in minutes.
- 1 U / mL of hyaluronidase black symbols
- 5 U / mL of hyaluronidase dark gray symbols
- 10 U / mL of hyaluronidase light gray symbols
- gelatin alone white symbols
- FIG. 6A shows the effect of hyaluronic acid on the viscoelasticity (G ': squares, G ": triangles) of a physical gel containing collagenase (1.12 ⁇ 10 -4 U / ml) at a given frequency. (6.3 rad.s -1 ) as a function of time: 1% hyaluronic acid (black symbols) and gelatin alone (white symbols).
- FIG. 6B shows the evolution of the viscoelastic properties (G ': squares, G ": triangles) of the physical gels, in the presence of hyaluronic acid (1%) and as a function of time, containing different concentrations of collagenase: 0, 95XiO "4 U.mL “ 1 (black symbols), 1, 12XiO -4 U-InL “1 L (gray symbols), 1, 29x1 O ⁇ U.mL " 1 (white symbols).
- FIG. 7A shows the effect of hyaluronic acid on the viscoelasticity (G ': squares, G ": triangles) of chemical gel containing collagenase (2.32XiO -4 U / mL) and transglutaminase (1 , 5 U / ml) at a given frequency (6.3 rad.s -1 ) as a function of time, 1% hyaluronic acid (black symbols) and gelatin alone (white symbols).
- FIG. 7B shows the evolution of the viscoelastic properties (G 1 : squares, G ": triangles) of the chemical gels, in the presence of hyaluronic acid (1%) and as a function of time, transglutaminase containers (1, 5 U / ml) and different concentrations of collagenase: 2.06 x 10 -4 U.mL -1 (black symbols), 2.32 x 10 -4 U.mL -1 (gray symbols), 2.58 x 10 -4 U-InL "1 (white symbols).
- FIG. 7B shows the evolution of the viscoelastic properties (G 1 : squares, G ": triangles) of the chemical gels, in the presence of hyaluronic acid (1%) and as a function of time, transglutaminase containers (1, 5 U / ml) and different concentrations of collagenase: 2.06 x 10 -4 U.mL -1 (black symbols), 2.32 x 10 -4 U.mL -1 (gra
- FIG. 9 represents the influence of the degradation of hyaluronic acid (1%) on the viscoelasticity (G ': squares, G ": triangles) of chemical gel containing transglutaminase (1.5 U / ml) and collagenase (2.32XIfX 4 U / mL), at a given frequency (6.3 rad.s -1 ) as a function of time.
- G ' squares, G ": triangles
- transglutaminase 1.5 U / ml
- collagenase (2.32XIfX 4 U / mL
- FIG. 10 represents the release, as a function of time, at 40 ° C., of azure from different gelatin gels (7%) obtained with 1 U / ml of transglutaminase.
- hyaluronic acid black bar
- 1% hyaluronic acid gray bar
- 1% hyaluronic acid white bar
- 15U / mL of hyaluronidase white bar
- Example 1 Process for preparing a biomaterial according to the invention
- Type A1 gelatin was used in this example. It is marketed by SIGMA (registered trademark) (G2500) and comes from pigskin. Its extraction procedure is an acid treatment, its pHi is 8. Finally, it has a Bloom index of 300.
- the hyaluronic acid used in this example is produced by the bacterium Steptrococcus Equi species. It was obtained by Fluka (Registered Trade Mark) (48178). It is a polysaccharide of about 1 million daltons. The carboxyl pKa of glucuronic acid is 2.4.
- the alginate used in this example is extracted from the seaweed Macrocystis pyrifera. It is marketed by SIGMA (Registered trademark) (A 2158).
- the fibrinogen used in this example is a type IV fibrinogen of bovine origin. It is marketed by SIGMA (registered trademark) (F 4753). It is 68% pure
- the transglutaminase (TG) used was produced by Ajinomoto under the name Activa WM (registered trademark). It is secreted by the bacterium Sterptoverticillium sp. Its molecular weight is 43,000 and it has an activity of 100 ⁇ g -1 at 40 ° C.
- the collagenase used in the examples is a zinc metalloprotease type IA, isolated from Clostridium histolyticum (Sigma, registered trademark, C-9891). Its molecular weight is 116,000. The maximum activity of the enzyme is obtained in the presence of CaCl 2 and NaCl. These elements have been shown to interfere with gelatin (results not provided), they have not been used in the collagenase activity assays in the examples of the present application.
- Thermolysin is a type X protease isolated from Bacillus thermoproteolyticcus rokko (provided by SIGMA, P-1512). It is a zinc metalloprotease and its molecular weight is 34,600.
- Trypsin is a serine protease isolated from the bovine pancreas. It is marketed by SIGMA (Registered Trade Mark), T-1426. It has a MW of 23,800. Prior to its conditioning by the preparer, the enzyme was treated with 2-1 tosylamide-2-phenylethyl chloromethyl ketone (TPCK). ) to reduce chymotrypsin activity present with trypsin. Alginate lyase is extracted from Flavobacterium sp. It has an activity of 38730 U / g, it is marketed by SIGMA (registered trademark). (To 1603).
- SIGMA registered trademark
- the thrombin used is extracted from the bovine plasma, it has an activity of 34.8 U / mg. It is marketed by the SIGMA company. (T 4648).
- a / Process for preparing a biomaterial comprising a first polymer network, a second polymer and a first enzyme a)
- a biomaterial is manufactured comprising a first polymer network which is a gelatin gel, the second polymer which is hyaluronic acid and a first enzyme which is hyaluronidase.
- the samples were prepared with a concentration of 7% gelatin, 1% hyaluronic acid (weight / volume ratio) and various concentrations of hyaluronidase (1, 5 and 10 U / ml).
- the gelatin powder was incubated with 50 mM Tris-HCl buffer at pH 7.4 and stored for 15 minutes at 40 ° C., the hyaluronic acid is then deposited on the surface of the solution.
- the preparation was then solubilized with stirring at 40 ° C. maximum for 15 minutes.
- a hyaluronidase solution previously prepared in the same buffer at an initial concentration at least five times higher than the final concentration, is mixed with the gelatin and hyaluronic acid preparation.
- a temperature ramp of 40 ° C. to 27 ° C. was applied to the solution, with a temperature drop of 0.5 ° C. per minute.
- a biomaterial is produced comprising a first polymer network which is a gelatin gel, the second polymer which is alginate and a first enzyme which is alginate lyase.
- the biomaterial consists of 5% gelatin, 1% alginate and 0.2 U / ml alginate lyase.
- a 50 mM Tris-HCl buffer solution at pH 7.4 is added to gelatin powder.
- An alginate solution is prepared beforehand (in the same buffer) and added to the gelatin. The mixture is incubated for 30 minutes at 40 ° C.
- a solution of alginate lyase is then added to the reaction medium and the mixture is incubated at 27 ° C.
- a biomaterial is made comprising a first polymer network which is an alginate gel, the second polymer which is gelatin and a first enzyme which is either collagenase, trypsin or thermolysin.
- the biomaterial consists of 1% alginate, 1% gelatin and a protease.
- Sodium alginate (0.1g) was dissolved in a freshly prepared solution of calcium-EDTA (282 mg CaCl 2 .2H 2 ⁇ and 798 mg Na 4 EDTA.2H 2 O in 10 mL) without heating.
- a solution of 5% gelatin is prepared in water, the mixture is stored at 4 ° C for at least 4 hours before use.
- the solutions are mixed so as to obtain final concentrations of 1% of alginate and 1% of gelatin, the mixture is incubated at 40 ° C. for 30 min.
- a 3M solution of D-Glucono- ⁇ -lactone is prepared extemporaneously and 312 ⁇ L of the above mixture is added at the same time as the protease.
- the concentration of final collagenase is 1, 12 ⁇ 10 5 U / ml.
- the final concentration of thermolysin is 3.25. 10 "4 UZmI.
- the final concentration of trypsin was 2.46. 10" 4 UZmI
- the mixture is incubated at 40 0 C and then the gelatin is in the form of solution. If the mixture is incubated at a temperature of 25 ° C. or 10 ° C., the gelatin is in gel form.
- B / Process for preparing a biomaterial comprising a first polymer network, a second polymer, a first enzyme and a second enzyme
- a biomaterial comprising a first polymer network which is a gelatin gel, the second polymer which is hyaluronic acid, a first enzyme which is hyaluronidase and a second enzyme which is either collagenase or trypsin, ie thermolysin.
- the biomaterials are prepared with the same experimental protocol as the biomaterial presented in Aa) and the protease (either collagenase, trypsin or thermolysin) is added to the gelatin solution.
- the volume of the enzyme samples corresponds to at least 20% of the final volume, in order to optimize the distribution in the gelatin solution.
- a single solution containing the first and the second enzyme is prepared in a water bath with electromagnetic stirring at 40 ° C. before being added to the gelatin.
- the final collagenase concentration is 1.12 ⁇ 10 -4 U / ml
- the final concentration of thermolysin is 3.25 ⁇ 10 -3 U / ml.
- the final concentration of trypsin is 2.46. 10 3 U / ml.
- a biomaterial comprising a first polymer network, a second polymer, a first enzyme and a third enzyme.
- a biomaterial is made comprising a first polymer network which is a gelatin gel, the second polymer which is hyaluronic acid, a first enzyme which is hyaluronidase, and a third enzyme which is transglutaminase.
- the samples were prepared with a concentration of 7% gelatin, 1% hyaluronic acid (weight to volume ratio), 1.5 U / ml of transglutaminase and different concentrations of hyaluronidase (1, 5 and 10 U / ml).
- the gelatin powder was incubated with 50 mM Tris-HCl buffer at pH 7.4 and stored for 15 minutes at 40 ° C., the hyaluronic acid then being deposited on the surface of the solution.
- the preparation was then solubilized with stirring at 40 ° C. maximum for 15 minutes.
- a biomaterial is made comprising a first polymer network which is a fibrin gel, the second polymer which is hyaluronic acid, a first enzyme which is hyaluronidase, and a third enzyme which is thrombin.
- the biomaterial contains 4.8 mg / mL fibrinogen, 0.24 mg / mL hyaluronic acid, 0.2 U / mL thrombin, 1 U / mL hyaluronidase, 2x10 2 mol / L CaCl 2 and 15x10 2 mol / L NaCl. All the constituents are dissolved in Tris-HCl buffer 50 mmol / L at pH 7.4 and preheated to 37 ° C. The fibrinogen is first mixed with CaCl 2 , NaCl and hyaluronic acid. Then the solution of thrombin and hyaluronidase is added to the reaction medium and the mixture is incubated at 37 ° C.
- D / A method of manufacturing a biomaterial comprising a first polymer network, a second polymer, and a first, a second and a third enzyme.
- a biomaterial comprising a first polymer network which is a gelatin gel, the second polymer which is hyaluronic acid and a first enzyme which is hyaluronidase, a second enzyme which is either collagenase or trypsin, ie thermolysin and a third enzyme which is transglutaminase.
- This biomaterial is prepared as Ca) but this time a protease (either collagenase or trypsin or thermolysin) is added to the enzymatic mixture of transglutaminase and hyaluronidase.
- the concentration of final collagenase is; 2,32.1CT 4 ; U / ml.
- the final concentration of thermolysin is 6.5. 10 3 U / ml.
- the final concentration of trypsin was 4.35. 10 ⁇ 3 U / ml.
- the first polymer network is a gelatin gel, with or without the second enzyme which is collagenase and the third enzyme which is transglutaminase.
- the samples were prepared with a concentration of 5% gelatin, 1 U / ml transglutaminase 0.1 mg / ml eosin (Sigma) and optionally 3.5. 10 "5 U / ml collagenase The gelatin powder was incubated with 50 mM Tris-HCl buffer pH 7.4 containing eosin and stored for 15 minutes at 40 ° C. It was then solubilized with stirring at a maximum of 40 ° C. for 15 minutes A solution of transglutaminase and optionally collagenase, previously prepared in the same buffer at an initial concentration at least five times higher than the final concentration, is mixed with the gelatin preparation.
- the purpose of this example is to show that gels not comprising a second polymer do not allow the controlled release of low molecular weight substance.
- the gel containing the collagenase was formed in thirty minutes and became liquid again (solubilization time) in about twenty hours.
- a second gel was also formed.
- This second gel was composed of 5% gelatin, 1 U / ml of transglutaminase.
- the release of eosin was monitored over time by spectophotometry at 517 nm, the signal increase is directly correlated to the release of eosin.
- the release of eosin by the gel is continuous ( Figure 1) in the presence or absence of collagenase in the gel.
- biomaterials used in this example are identical to those used in Example 2 except that eosin was replaced by Dextran blue (MW 2,000,000) to a final concentration of 5 mg / ml.
- the monitoring of the release of dextran blue was carried out by spectophotometry at 620 nm, the increase of the signal is directly correlated with the release of dextran blue.
- the release of molecules present in gels depends on the viscoelastic properties of the gel.
- the release of active substance is only related to the resolubilization time of the gel. The release of active substance during the gel phase is therefore not controlled.
- Example 4 Method for studying the elasticity and viscosity of the biomaterial
- rheology The definition of rheology was established in 1929 by the American Society of Rheology. It includes all studies on the flow and deformation of materials. Its principle consists in applying a constraint (elongation, compression, shear, ...) to a sample and results in the deformation of this one. The relationship between stress and deformation depends on the intrinsic properties of the sample and the external conditions. The deformation used in rheology studies is the shearing motion. A particularly simple example of shearing relates to the movement of a sample between two flat surfaces, one of which is stationary and the other endowed with a displacement parallel to itself.
- Oscillatory or dynamic analysis consists in imposing a shearing motion that oscillates with a given pulsation, ⁇ .
- the stress (T) and the deformation (y) evolve sinusoidally over time, with the same pulsation but with a certain phase shift.
- This ratio is called shear modulus. It is a complex number consisting of an elastic component (the module of conservation) and a viscous component (the loss module). Modules have the dimension of a constraint with a unit in Pascal (Pa).
- phase shift ⁇ is connected to these two components by:
- the conservation module is also called elastic module. It is clear that if ⁇ is between 0 and 45 °, the material has a more elastic behavior than viscous, whereas it is the opposite if ⁇ is between 45 and 90 °.
- Gelling processes are characterized by a freeze point, which corresponds to the fraction of links created necessary for the formation of the gel.
- the freezing time is determined by the time it takes to reach the freezing point.
- the freezing time can be considered as the time required for the phase angle ⁇ , between a stress and an oscillating deformation, to reach a value of 45 ° and therefore that the ratio G 1 VG 'equals 1 .
- the ratio G 1 VG 'equals 1 In that case :
- This definition of the freezing point takes into account that the relaxation times are infinite in the linear domain of the gel and therefore that the viscoelastic parameters are independent of the measurement conditions.
- the rheometer used is a RheoStress 150 from ThermoElectron (Trade Mark).
- the rheometer system is cone / plane, with an imposed deformation (an imposed constraint is possible).
- the control of the actual deformation was carried out by an iterative method which consists of applying a torque (a constraint) and recording the resulting deformation until obtaining the good deformation.
- Two cones were used for the experiments. They are both made of titanium and have an angle of 2 °. On the other hand, they differ in their diameter, 35 mm for one and 60 mm for the other.
- the rheometer was connected to an F6 cryostat (ThermoElectron) which thermostats the support on which the sample is based. In order to avoid evaporation, a system is used which consists in creating a humid chamber. In addition, silicone oil (50 mPa.s) was added in the channel of the support to avoid as much as possible the exchanges between the samples and the air.
- F6 cryostat ThermoElectron
- Rhéowin Trademark
- Example 5 Study of the effect of the degradation of the second polymer on the polymer network.
- the purpose of this example is to demonstrate the effect of the degradation of the second polymer by the first enzyme on the biomaterial of the invention.
- the biomaterial tested comprises:
- gelatin as the first polymer, gelatin and therefore as the first polymer network: a gelatin gel (gel (A)
- hyaluronidase different concentrations were added to a solution of 7% gelatin and 1% hyaluronic acid. A temperature ramp of 40 ° C. to 27 ° C. was then applied for the gelation.
- the hyaluronidase concentrations used are 1, 5, and 10 U / mL. This concentration range made it possible to evaluate the possible effect of the degradation of hyaluronic acid on the gelation, but also to quantify these effects.
- a solution containing 1% of hyaluronic acid, 7% of gelatin and 1 U / ml of hyaluronidase was gelled according to the method described in Example 1. The formation of triple helices, over time, was followed in polarimetry and compared with that of the same solution in the absence of the enzyme.
- the polarimeter used is a Jasco 1100 (registered trademark), equipped with an external cryostat Julabo F 25 with the temperature controlled by computer. It measures the angle with an accuracy of 0.001 °.
- the glass cell used has an optical path of 0.1 dm and a volume of 1 ml.
- the tank can be thermostated, thanks to a water jacket connected to the cryostat. The temperature, thus regulated, was measured directly in the tank by means of a probe connected to the polarimeter. All measurements of the study were made at 436 nm.
- a computer has been connected to the polarimeter and software records the angle and temperature in the tank as a function of time.
- the Jasco software is the “Spectra Manager” (registered trademark) while the cryostat is managed from the software "Julabo EasyTemp” (registered trademark).
- the kinetics of formation of triple helices of gelatin are identical whatever the type of gel. After 900 minutes, the triple helix content varies between 25.5 and 27%.
- Example 6 Study of the effect of the degradation of the second polymer on the first polymer network formed by the third enzyme.
- a biomaterial comprising a first polymer network which is a gelatin gel, the second polymer which is hyaluronic acid, a first enzyme which is hyaluronidase, and a third enzyme which is transglutaminase.
- the hyaluronidase concentrations used are 1, 5 and 10 U / mL
- the degradation of I 1 AH has an effect on the value of G 'only on the shortest time. This is because the faster the solution gels, the faster G 1 increases. But whether it is after 900min or even from 150min, the G 'of the different samples are equivalent to that of the gel not containing HA. Whatever the state of degradation of the polysaccharide, it has no influence on the covalently bridged gelatin network.
- the purpose of the example is to highlight the effect of the second polymer and the second enzyme on the gel (A).
- the biomaterial tested comprises:
- gelatin as the first polymer, gelatin and therefore as the first polymer network: a gelatin gel (gel (A)),
- collagenase As the second enzyme: collagenase,
- the samples were prepared with a concentration of 7% gelatin, 1% hyaluronic acid (weight-to-volume ratio) and different final concentrations of collagenase: 0.95. 10 ⁇ ; 1.12.10 "4;. 1, 29.10 ⁇ U / ml
- the gelatin powder was incubated with Tris-HCl buffer 50mM pH 7.4 and stored for 15 minutes at 4 0 C, hyaluronic acid is then deposited on the surface of the solution It was then solubilized with stirring at a maximum of 40 ° C. for 15 minutes
- a collagenase solution previously prepared in the same buffer at an initial concentration at least five times greater than the final concentration, is mixed with the gelatin and hyaluronic acid preparation.
- the purpose of the example is to know if the double transition sol / gel then gel / sol catalyzed by the action of the second (collagenase) and third enzyme (transglutaminase) on the first polymer network (gelatin gel), is influenced by the presence of the second polymer (AH).
- the samples were prepared with a concentration of 7% gelatin, 1% hyaluronic acid (weight / volume ratio), 1.5 U / ml of transglutaminase and various final concentrations of collagenase (2, 06. 10 "4; 2,32.1U”4;. 2,58.1U “4 U / ml) the gelatin powder was incubated with buffer Tris-HCl 50 mM pH 7.4 and stored for 15 minutes at 4 0 C, hyaluronic acid, is then deposited on the surface of the solution. It was then dissolved with stirring at 40 0 C for up to 15 minutes.
- a solution of hyaluronidase and transglutaminase is mixed with the gelatin and hyaluronic acid preparation.
- the gelatin / HA system gels in 3.1 min while the gelatin system alone gels in 15 min.
- the maximum viscoelasticity is also strongly increased in the presence of the polysaccharide since the value of G ' max is 264 Pa (50 Pa without AH) and that of G " max is 61.7 Pa (4.4 Pa without AH).
- the total resolubilization time of the gel is 396 minutes against 152 minutes in the other case (FIG. 7).
- the intrinsic viscoelasticity of hyaluronic acid thus causes the viscoelasticity of the system to increase more rapidly during gelation to give a stronger gel and finally limits its resolubilization by collagenase.
- the double sol / gel (A) gel (A) / sol transition catalyzed by the action of the second and third enzymes on the first polymer network is influenced by the presence of the second polymer.
- the purpose of the example is to know if the double transition sol / gel gel / sol catalyzed by the action of the second enzyme (collagenase) on the first polymer network (gelatin gel), is influenced by the degradation of the second polymer (AH) by the first enzyme (hyaluronidase).
- the biomaterial is prepared according to the protocol of Example B.
- Example 10 Study of the effect of the degradation of the second polymer by the first enzyme combined with the action of the second enzyme on the gel (A) formed by a third enzyme.
- the purpose of the example is to know if the double transition sol / gel gel / sol catalysed by the action of the second enzyme (collagenase) on the polymer network (gelatin gel) formed by a third enzyme (transglutaminase) , is influenced by the degradation of the second polymer (AH) generated by the first enzyme (hyaluronidase).
- the biomaterial is prepared according to the protocol of Example D.
- the biomaterial tested includes:
- gelatin as the first polymer, gelatin and thus as the first polymer network: a gelatin gel (gel (A))
- transglutaminase As the third enzyme: transglutaminase, and
- gelatin is at a concentration of 7% and transglutaminase at 1 U / ml in the various gels.
- hyaluronic acid is at a concentration of 1% and hyaluronidase at 15 U / mL.
- An enzymatic solution (either transglutaminase alone or transglutaminase and hyaluronidase) prepared in the same buffer is then mixed with the gelatin solution. The mixture is placed at 40 ° C.
- a gel containing gelatin and transglutaminase (TG) and azure was thus obtained.
- a gel comprising gelatin, Hyaluronic acid (HA), transglutaminase (TG) and azure were obtained.
- a gel comprising gelatin of hyaluronic acid (HA) and transglutaminase (TG), hyaluronidase and azure was obtained.
- a measurement of the release of azure as a function of time and as a function of the gel was carried out (FIG. 10) by measuring the optical density (OD at 630 nm) of the medium in which the different gels were located.
- Example 12 release of hyaluronic acid by the biomaterial according to the invention
- the biomaterial tested includes:
- gelatin as the first polymer, gelatin and therefore as the first polymer network: a gelatin gel (gel (A)),
- biomaterials all contain 3% gelatin and were obtained by incubation at 20 ° C.
- hyaluronic acid is at a concentration of 1% and hyaluronidase at 15U / ml.
- the gel was obtained by the following method: a solution of 50 mM Tris-HCl buffer pH 7.4 was added to gelatin powder. A solution of hyaluronic acid at 1.5% was then added to the gelatin solution, and the mixture was incubated at 40 0 C for 15 min. For the gel containing hyaluronidase, a solution containing the enzyme, prepared in the same buffer, was then mixed with the gelatin solution and the mixture is placed at 20 ° C.
- the release of hyaluronic acid from the gels was evaluated in polarimetry.
- the polarimeter used was identical to that of Example 5. This release of substance is controlled according to the size and is controlled over time.
- the biomaterial of the invention therefore allows a controlled release of hyaluronic acid included in a gelatin gel.
- the modulation of the release of substance contained in the aqueous phase of a single gel is carried out by modifying the viscosity of the aqueous phase.
- the biomaterial of the invention thus allows a controlled release of substances.
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Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP08871919A EP2219604A2 (fr) | 2007-11-14 | 2008-11-13 | Biomateriau permettant la delivrance controlee d'actifs |
| JP2010533633A JP5497653B2 (ja) | 2007-11-14 | 2008-11-13 | 成分の制御送達のための生体材料 |
| CA2705369A CA2705369C (fr) | 2007-11-14 | 2008-11-13 | Biomateriau permettant la delivrance controlee d'actifs |
| US12/742,588 US8877705B2 (en) | 2007-11-14 | 2008-11-13 | Biomaterial for the controlled delivery of ingredients |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US98778507P | 2007-11-14 | 2007-11-14 | |
| US60/987,785 | 2007-11-14 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| WO2009095562A2 true WO2009095562A2 (fr) | 2009-08-06 |
| WO2009095562A3 WO2009095562A3 (fr) | 2009-12-23 |
Family
ID=40913334
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/FR2008/001596 Ceased WO2009095562A2 (fr) | 2007-11-14 | 2008-11-13 | Biomateriau permettant la delivrance controlee d'actifs |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US8877705B2 (fr) |
| EP (1) | EP2219604A2 (fr) |
| JP (1) | JP5497653B2 (fr) |
| CA (1) | CA2705369C (fr) |
| WO (1) | WO2009095562A2 (fr) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120195877A1 (en) * | 2009-10-07 | 2012-08-02 | Totai Co., Ltd. | Degradable composite material containing chitin or chitosan |
| EP2623129A1 (fr) * | 2012-02-03 | 2013-08-07 | MA.I.A Woundcare | Pansement et procede de fabrication |
| US10612003B2 (en) | 2010-10-27 | 2020-04-07 | Upm-Kymmene Corporation | Plant derived cell culture material |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009095562A2 (fr) * | 2007-11-14 | 2009-08-06 | Ma.I.A Woundcare | Biomateriau permettant la delivrance controlee d'actifs |
| JP5887116B2 (ja) * | 2011-11-30 | 2016-03-16 | 富士フイルム株式会社 | 特定のニュートン粘性係数を有するアルギン酸及び/又はその塩を含有するインクジェット吐出用インク、該インクジェット吐出用インクを用いたハイドロゲルの形成方法、並びに、該インクジェット吐出用インクにより形成されたハイドロゲル |
| US20130302896A1 (en) * | 2012-03-23 | 2013-11-14 | Northwestern University | Soy-protein containing porous materials |
| TWI569809B (zh) * | 2014-10-08 | 2017-02-11 | 國立交通大學 | 長效型持續釋放藥物之注射式凝膠組成物及其製備方法 |
| JP6226409B1 (ja) * | 2017-01-17 | 2017-11-08 | 株式会社エクセルシア | コロストミー用排泄物処理剤 |
| US10774137B2 (en) | 2017-01-24 | 2020-09-15 | Société des Produits Nestlé S.A. | Compositions and methods for reducing at least one symptom of human allergy to cats |
| WO2019020679A1 (fr) * | 2017-07-25 | 2019-01-31 | Carbios | Composition d'administration de médicament |
| US11998654B2 (en) | 2018-07-12 | 2024-06-04 | Bard Shannon Limited | Securing implants and medical devices |
| JPWO2020045162A1 (ja) * | 2018-08-30 | 2021-08-12 | 学校法人慶應義塾 | 薬物送達用担体 |
| CN109679823B (zh) * | 2018-11-19 | 2022-03-15 | 江苏汇先医药技术有限公司 | 一种用于生物分子、细胞或细菌的捕获材料及捕获筛 |
| CN110038134B (zh) * | 2019-05-31 | 2022-03-29 | 南开大学 | 用于肿瘤治疗的双响应性载抗肿瘤药物的纳米药物传递系统及制备方法 |
| KR102271980B1 (ko) * | 2020-11-30 | 2021-07-02 | 주식회사 피엘마이크로메드 | 콜라겐-알지네이트 창상피복재 및 이의 제조방법 |
| CN113956413A (zh) * | 2021-11-11 | 2022-01-21 | 南京工业大学 | 一种纳米复合水凝胶的制备方法及其在促糖尿病伤口愈合中的应用 |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5866165A (en) * | 1997-01-15 | 1999-02-02 | Orquest, Inc. | Collagen-polysaccharide matrix for bone and cartilage repair |
| JP4116683B2 (ja) * | 1997-02-28 | 2008-07-09 | ツェー・エス・エル・ベーリング・ゲー・エム・ベー・ハー | 徐放性局所送達製剤 |
| FR2878533B1 (fr) * | 2004-11-26 | 2007-04-27 | Univ Cergy Pontoise | Biomateriau capable d'effectuer successivement une transition solution/gel puis une transition gel/solution |
| EP1934289A4 (fr) | 2005-09-09 | 2011-07-20 | Ottawa Health Research Inst | Alliages ipn, et procedes et compositions associes |
| WO2009095562A2 (fr) * | 2007-11-14 | 2009-08-06 | Ma.I.A Woundcare | Biomateriau permettant la delivrance controlee d'actifs |
-
2008
- 2008-11-13 WO PCT/FR2008/001596 patent/WO2009095562A2/fr not_active Ceased
- 2008-11-13 US US12/742,588 patent/US8877705B2/en not_active Expired - Fee Related
- 2008-11-13 CA CA2705369A patent/CA2705369C/fr not_active Expired - Fee Related
- 2008-11-13 JP JP2010533633A patent/JP5497653B2/ja not_active Expired - Fee Related
- 2008-11-13 EP EP08871919A patent/EP2219604A2/fr not_active Withdrawn
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120195877A1 (en) * | 2009-10-07 | 2012-08-02 | Totai Co., Ltd. | Degradable composite material containing chitin or chitosan |
| CN102573937B (zh) * | 2009-10-07 | 2015-03-25 | 株式会社耐热性酵素研究所 | 含有几丁质或壳聚糖的可降解复合材料 |
| US10612003B2 (en) | 2010-10-27 | 2020-04-07 | Upm-Kymmene Corporation | Plant derived cell culture material |
| EP2623129A1 (fr) * | 2012-02-03 | 2013-08-07 | MA.I.A Woundcare | Pansement et procede de fabrication |
| WO2013114047A1 (fr) * | 2012-02-03 | 2013-08-08 | Ma.I.A Woundcare | Pansement et procede de fabrication |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2011503157A (ja) | 2011-01-27 |
| CA2705369A1 (fr) | 2009-08-06 |
| US20100330157A1 (en) | 2010-12-30 |
| EP2219604A2 (fr) | 2010-08-25 |
| JP5497653B2 (ja) | 2014-05-21 |
| US8877705B2 (en) | 2014-11-04 |
| CA2705369C (fr) | 2016-10-18 |
| WO2009095562A3 (fr) | 2009-12-23 |
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