WO2013178954A1 - Solide hybride organique inorganique amelioee à surface externe modifiée - Google Patents
Solide hybride organique inorganique amelioee à surface externe modifiée Download PDFInfo
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- WO2013178954A1 WO2013178954A1 PCT/FR2013/051219 FR2013051219W WO2013178954A1 WO 2013178954 A1 WO2013178954 A1 WO 2013178954A1 FR 2013051219 W FR2013051219 W FR 2013051219W WO 2013178954 A1 WO2013178954 A1 WO 2013178954A1
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- A61K47/24—Organic compounds, e.g. natural or synthetic hydrocarbons, polyolefins, mineral oil, petrolatum or ozokerite containing atoms other than carbon, hydrogen, oxygen, halogen, nitrogen or sulfur, e.g. cyclomethicone or phospholipids
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Definitions
- the present invention relates to an improved metal-organic framework (MOF) solid, porous crystalline, with a modified external surface, and, in particular, to its preparation process.
- MOF metal-organic framework
- the MOF solid of the present invention is useful for example as a contrast agent and / or for the transport of pharmaceutical compounds.
- the solid of the present invention can also be used for applications in the field of storage, separation, catalysis, cosmetics or agro-food. It can also be used for vectorization and / or monitoring of pharmaceutical compounds in an organism. It can also be used for detoxification. It may be, for example, in the form of crystals, powder, particles or nanoparticles.
- the use of carriers and vectors of molecules of interest has become an important issue for the development of new diagnostic methods or new drugs.
- the molecules of interest have characteristics which have an influence on the pharmacokinetics and biodistribution of these molecules and which are not always favorable or adaptable to the medium into which they are introduced. These are for example physicochemical characteristics such as instability, the strong tendency to crystallization, the low hydro / liposolubility and / or biological characteristics such as toxicity, biodegradability, etc.
- Metal-Organic Framework are inorganic-organic hybrid framework coordination polymers comprising metal ions and organic ligands coordinated to metal ions. These materials are organized into a mono-, bi- or tri-dimensional network where the inorganic entities are connected to each other by spacer ligands periodically. These materials have a crystalline structure, are usually porous and could be used in many industrial applications such as gas storage, adsorption of liquids, separation of liquids or gases, catalysis, etc.
- Organic-inorganic hybrid nanoparticles (nanoMOFs) based on porous iron carboxylate have recently been developed in order to meet certain challenges in modern galenics.
- the nanoMOFS are, for example, formed from iron (III) units bridging with endo or exogenous polycarboxylic acids, such as fumaric acid or trimesic acid, large amphiphilic cages of defined size (3 to 60 ⁇ ). ). It is possible to modulate the pore size, the structure as well as the internal microenvironment (hydrophilic / hydrophobic balance) by modifying the nature and functionalization of the carboxylic acids used during the synthesis of nanoMOFs.
- these nanoparticles or nanoMOFs of iron carboxylate Due to their high pore volume and high surface area, these nanoparticles or nanoMOFs of iron carboxylate have been found to be capable of adsorbing by simple impregnation into active principle solutions, with very large amounts of these therapeutic molecules being able to exceed 40% by weight. weight in the case of several hydrophilic, hydrophobic or amphiphilic molecules which have never previously been effectively encapsulated (encapsulated quantities ⁇ 1 or at most 5% by weight).
- this surface modification strategy has disadvantages, in particular because of the porous nature of the MOF materials. These are manifested in particular by a reduced encapsulation capacity, and a greater difficulty in controlling the release of the encapsulated active ingredients (see Example 11).
- the present invention is specifically intended to meet these needs and disadvantages of the prior art by providing a porous crystalline MOF solid with a modified outer surface comprising a three-dimensional succession of identical or different units corresponding to the following formula (I):
- each occurrence of M independently represents a metal ion selected from the group consisting of Fe 2+ , Fe 3+ , Zn 2+ , Zr 4+ , Ti 4+ , Ca 2+ , Mg 2+ and Al 3+ ;
- m, k, 1 and p are numbers ⁇ 0 chosen so as to respect the neutrality of the charges of the pattern; preferably, m, k, 1 and p are independently 0 to 4, for example m and p are independently 1, 2 or 3 and / or k and 1 are independently 0 or 1;
- X is a ligand chosen from the group comprising OH ⁇ ,
- L is a spacer ligand (polyfunctionalized) comprising a radical R ° and q occurrences of a complexing group A, where
- Q is an integer from 2 to 6;
- R A1 represents a hydrogen atom or a C1-6alkyl radical; where * denotes the point of attachment of the group A with the radical R °;
- Ci_i 2 alkylene C 2 -i 2 alkenylene or C 2 _i 2 alkynylene
- the radical R ° being optionally substituted by one or more groups independently selected from the halogen, OH, NH 2 , NO 2 or C 1 -C 6 alkyl group; wherein the outer surface of the MOF is modified in that it comprises at least one organic surface agent in interaction with (for example complexed to) a metal center M or a ligand L located on the outer surface of the crystalline MOF solid.
- the variable q is at least 2, the ligand L is inherently polyfunctionalized.
- the ligand L represents a di-, tri-, tetra- or hexa-carboxylate ligand.
- the size of the pore access windows of the MOF materials described herein is defined by the parameters M, X, L, m, k, 1 and p.
- the MOF materials are well known in the scientific literature, and the reader will know without difficulty from the selection of the parameters M, X, L, m, k, 1 and p operated (and therefore the choice of the MOF material in question) determine the structure of the MOF, including the pore window sizes, and in particular the size of the larger pore access windows of the MOF material.
- the organic surface agent can be chosen from a monomer, oligomer or cyclodextrin polymer; a branched polyethylene glycol (e.g.,
- tellate or dendrimer
- a protein a polysaccharide with or without a plurality of polyethylene glycol (PEG) side chains, themselves optionally optionally coupled at the end of the chain with specific ligands; or a polysaccharide such as chitosan, insoluble in water at 6 ⁇ pH ⁇ 8 and soluble in water at pH ⁇ 5.
- PEG polyethylene glycol
- said organic surface agent being in interaction with (for example complexed to) a metal center M or a ligand L located on the surface of the crystalline MOF solid via said one or more phosphate, phosphonate, sulfate, carboxylate group (s), hydroxy, cathecolate, thiolate, heterocyclic nitrogen, amide or amino, or a combination of these groups.
- the PEG chains may carry at their free end a specific ligand (antibody, peptide, folate, etc.) allowing the change of their biodistribution, in particular a targeting of the nanoparticles.
- the organic surface agent interacts with a metal center M or with a ligand L located on the surface of the crystalline MOF solid via at least one of those mentioned above.
- the interaction is preferably by covalent, iono-covalent, ionic interactions or weak interactions (i.e. hydrogen bonds) (e.g., iron-phosphate coordination).
- weak interactions i.e. hydrogen bonds
- the hydrophobic type interactions are preferably excluded because they are too weak to ensure good stability of the coating.
- good stability of recovery means a sufficient stability to allow, in a biological medium, to achieve a function of biomedical interest: for example, to reach a target (ex tumor, infected tissue, etc.); interact with the intestinal mucosa and / or circulate long enough in the blood stream.
- a "good stability of the recovery” can represent a stall of less than 20% of the recovery (that is to say of the agent of surface on the outer surface of the MOF material) for one hour of incubation with stirring at 37 ° C. in 0.15 M phosphate buffer solution, pH 7.4.
- the density of the anchor points may preferably be increased if one or more of the criteria following are fulfilled:
- the surfactant may be dextran grafted with both PEG chains and Alendronate bisphosphonate groups, as exemplified herein.
- the synthesis method according to the present invention makes it possible to vary both the density of PEG chains and anchor points (alendronate).
- the organic surface agent can be chosen from a monomer, oligomer or cyclodextrin polymer; a branched polyethylene glycol group; a polysaccharide carrying a plurality of polyethylene glycol side chains; or a polysaccharide insoluble in water at 6 ⁇ pH ⁇ 8 and soluble in water at pH ⁇ 5.
- the various occurrences of M in the units of formula (I) may be identical or different.
- each occurrence of M independently represents a metal ion Fe 2+ , Fe 3+ , Zn 2+ or Ca 2+ .
- solid in the sense of the present invention any type of crystalline material.
- Said solid may for example be in the form of crystals, powder, particles of various shapes, for example spherical, cubic, parallelepipedic, rhombohedral, lamellar, etc.
- the particles may be in the form of nanoparticles.
- nanoparticle is meant a particle of size less than 1 ⁇ .
- the nanoparticles of MOF solid according to the invention may have a diameter of less than 1000 nanometers, preferably less than 500 nm, more preferably less than 250 nm, more particularly less than 100 nm.
- rigid section of a molecule or a surfactant is meant the dimension of the minor axis of the rigid volume occupied by the molecule or the surfactant in a given medium, preferably a liquid medium.
- a liquid medium may be the liquid medium in which the molecule or the surfactant is brought into contact with the MOF material, in particular during the modification of the external surface of the MOF material with the molecule or the surface agent in question.
- it may also alternatively be the liquid medium in which the MOF material, modified with the molecule or surfactant according to the present invention, is located.
- the rigid volume represents the volume occupied by the molecule or the surfactant in its most stable conformation in the medium in question, either when changing the outer surface of the MOF material according to the present invention, or once the surface modification is performed.
- the medium may be water, a physiological liquid, an organic solvent or a water / organic solvent mixture.
- the rigid section can be calculated using numerical simulation (Materials Studio software, Accelrys, known to those skilled in the art) once the most stable conformation of the molecule or surfactant in the medium given is determined by minimizing energy.
- the Accelrys software, Materials Studio version 5.0 (2010) can be used.
- cyclodextrin monomer is meant a cyclodextrin unit, which may be for example a -, ⁇ - or ⁇ -cyclodextrin.
- cyclodextrin oligomer is meant a sequence of 2 to 9 identical or different cyclodextrin units.
- the cyclodextrin units may for example be -, ⁇ - or ⁇ -cyclodextrins.
- cyclodextrin polymer or “polycyclodextrin” is meant a polymer comprising at least 10 identical or different cyclodextrin units.
- the cyclodextrin polymer contains at least 10 cyclodextrin units, preferably at least 15 cyclodextrin units, and advantageously at least 20 cyclodextrin units.
- the cyclodextrin polymers carrying cyclodextrins comprise on average at least 100 cyclodextrin units, preferably at least 200 cyclodextrin units, and advantageously at least 300 cyclodextrin units.
- the cyclodextrin polymers comprise on average at least 400 cyclodextrin units.
- the polycyclodextrin contains on average between 10 and 1500 cyclodextrin units within its structure, preferably on average between 10 and 1000 cyclodextrin units, preferably on average between 15 and 800 cyclodextrin units, preferably on average between 50 and 600 units.
- cyclodextrin and advantageously on average between 100 and 400 cyclodextrin units.
- the cyclodextrin units present within the polycyclodextrin may, in general, be ⁇ -cyclodextrins, ⁇ -cyclodextrins, ⁇ -cyclodextrins, or mixtures of at least two of these types of cyclodextrins.
- the average number of cyclodextrin units present in the polymers of the invention can for example be established by steric exclusion chromatography and by nuclear magnetic resonance.
- the cyclodextrin units may be linked together by hydrocarbon chains of 3 to 50 carbon atoms, linear or branched, optionally interrupted by one or more oxygen atoms, and these chains preferably being alkyl chains, alkenyls, or alkynyls of 3 to 50 carbon atoms, or else polyether chains of 3 to 50 carbon atoms, these chains may be substituted with hydrophilic groups (hydroxyl or amino groups for example).
- the chains linking together the cyclodextrin units may comprise at least 3 carbon atoms and preferably from 4 to 50 carbon atoms, the shortest path between two cyclodextrin units being preferably constituted by a chain comprising between 3 and 8 carbon atoms. carbon.
- the hydrocarbon chains linking together two cyclodextrin units within a polycyclodextrin correspond to the general formula a group of formula -O- (CH 2 -CHOR 1 -CH 2 ) n -O- where n is an integer between 1 and 50 (generally between 2 and 10) and where, in each of n units (CH 2 -CHOR 1 -CH 2 ), R 1 denotes either a hydrogen atom or a chain -CH 2 -CHOH-CH 2 -O- linked to a cyclodextrin unit of the polymer.
- the polycyclodextrins can typically be obtained by crosslinking of cyclodextrin molecules with bifunctional compounds capable of forming covalent bonds with the hydroxyl groups of the cyclodextrins.
- it may be dicarboxylic acids such as citric acid, sebacic acid, fumaric acid, glutamic acid, maleic acid, malic acid, malonic acid, aspartic acid, oxalic acid, succinic acid, glutaric acid, trans acid, trans-muconic acid, terephthalic acid, isophthalic acid, oxaloacetic acid, phthalic acid, acid adipic or butanedioic acid.
- dicarboxylic acids such as citric acid, sebacic acid, fumaric acid, glutamic acid, maleic acid, malic acid, malonic acid, aspartic acid, oxalic acid, succinic acid, glutaric acid, trans acid, trans-muconic acid, terephthalic acid,
- the polycyclodextrins can be obtained by polycondensation of cyclodextrin molecules and epichlorohydrin, generally in a basic medium (generally in an aqueous medium supplemented with sodium hydroxide, at a mass concentration of 10 to 40%), the molar ratio cyclodextrins / epichlorohydrin being preferably between 1: 15 and 1: 1, and advantageously between 1: 15 and 1: 8.
- a basic medium generally in an aqueous medium supplemented with sodium hydroxide, at a mass concentration of 10 to 40%
- the molar ratio cyclodextrins / epichlorohydrin being preferably between 1: 15 and 1: 1, and advantageously between 1: 15 and 1: 8.
- Polycyclodextrins can also be obtained by polycondensation of molecules of cyclodextrins and hexamethylene diisocyanate, as described for example in Elif Yilmaz Ozmen et al. Bioresource Technology, Volume 99, Issue 3, Pages 526-531 (2008) [11].
- polycyclodextrins can also be obtained by polycondensation of cyclodextrin molecules and a functionalized polyethylene glycol, as described for example in:
- the polycyclodextrins can also be obtained by polycondensation of cyclodextrin molecules and several oligoethylimine branches, to form a star polymer, as described for example in Yang et al., Biomaterials, Volume 28, Issue 21, Pages 3245-3254 (2007).
- the total mass of the cyclodextrin units present within the polycyclodextrins represents at least 30%, advantageously at least 40%, and even more preferably at least 50%, of the total mass of said polymers, this total mass of the cyclodextrin units generally representing between 30 and 80%, and preferably between 40 and 75% of the total weight of the polymers based on cyclodextrin units.
- This mass percentage of cyclodextrins in the polymers that can be used in the context of the present invention may, for example, be determined by nuclear magnetic resonance (NMR).
- the polycyclodextrin may be a poly-p-cyclodextrin of the following Formula I:
- n represents an integer from 1 to 50, preferably from 2 to 10; and the number of beta-cyclodextrin units is on average between 10 and 1500, preferably on average between 10 and 1000, preferably on average between 15 and 800, preferably on average between 50 and and 600, and preferably on average between 100 and 400 units.
- the monosaccharides at the ends of the structure schematize the continuity of the polymer (i.e., linking of ⁇ -cyclodextrin units forming the remainder of the polymer).
- the polycyclodextrin may be a higher molecular weight poly-p-cyclodextrin, and may have formula I above, wherein n is an integer of from 1 to 50, preferably from 2 to 10; and the number of beta-cyclodextrin units is on average between 10 and 2000, preferably on average between 100 and 1800 units, preferably on average between 500 and 1600 units, and advantageously on average between 800 and 1500 units.
- the polycyclodextrin may be a poly-cyclodextrin of formula I above in which the cyclodextrin units are replaced by cyclodextrins.
- the polycyclodextrin may be a poly- ⁇ -cyclodextrin corresponding to Formula I above in which the ⁇ -cyclodextrin units are replaced by ⁇ -cyclodextrins.
- the branched polyethylene glycol group may be a polyethylene glycol dendrimer.
- Dendrimer refers to a molecule whose architecture resembles that of the branches of a tree. It is a macromolecule of three-dimensional structure where the connected monomers are associated in a tree process around a central multivalent heart. Dendrimers generally take a very regular or spherical globular form, highly branched and multifunctionalized. They consist of three specific regions: a multivalent central heart,
- each dendritic branch consists of a number of branching generations
- dendrimers have both internal cavities and a large number of terminal groups at the periphery, easily accessible, which can be responsible for a variety of properties and reactivities.
- Dendrimers are built step by step using a succession of sequences, each resulting in a new generation. Structural control is critical to the specific properties of these macromolecules. Synthetic methods are known in the art. For example, we can mention:
- PEG dendrimers are commercial, it may be a branched PEG responding to one of the following structures:
- PAMAM-PEG Dendrimer kit generations 3-6 marketed by Sigma-Aldrich under the reference 683493.
- the surfactant may be a protein.
- the protein can be enzymatic, structural, transport, signaling, regulatory or motor, such as albumin or immunoglobulins.
- polysaccharide carrying a plurality of polyethylene glycol side chains means a polysaccharide on which polyethylene glycol groups are grafted.
- the polysaccharide may be a natural or synthetic polysaccharide.
- it may be hyaluronic acid, alginic acid, chitosan, chitin, scleroglucan, dextran, amilose, amilopectin, a cellulose derivative, starch, pullulan, pectin, alginate, heparin, ulvan, carrageenan, fucan, curdlan, xylan, polyguluronic acid, xanthan, arabinan, polysaccharides containing sialic acid or polymannuronic acid.
- the polysaccharide may be chitosan.
- the water-insoluble polysaccharide at 6 ⁇ pH ⁇ 8 and soluble in water at pH ⁇ 5 can be chitosan.
- the hydrodynamic diameter of the The polysaccharide can be increased, which prevents it from penetrating into the pores of the MOF particles, and thus allows a better control of the release profile of the compounds possibly encapsulated in the MOFs.
- Chitosan is water soluble at low pH but forms aggregates at neutral pH. Chitosan can therefore be used to cover, by a technique related to coacervation, the nanoMOFs of the present invention by adjusting the pH.
- Phosphated cyclodextrins are known in the prior art. For example, mention may be made of beta-cyclodextrin-phosphate marketed by the company Cyclolab.
- Sulfated cyclodextrins are known in the prior art. For example, mention may be made of beta-cyclodextrin sulfate sold by the company Cyclolab
- Bisphosphonate cyclodextrins are known in the art.
- the synthetic methods for functionalizing the alpha and / or gamma-cyclodextrins with the phosphate, sulfate and bisphosphonate groups can be adapted from the synthetic methods used for the preparation of their beta-cyclodextrin homologues mentioned above.
- the bisphosphonate group may be in the form of an alendronate or zoledronate group.
- the groups that complex the strongest of the metal sites for example the phosphate, cathecolate, carboxylate, sulfate phosphonate and / or bisphosphonate groups.
- complexing groups such as hydroxy, thiolate, nitrogen-containing heterocyclic groups, amido or amino
- organic surface agent as defined above, functionalized with several amino groups, in order to compensate for the low complexing power of the latter.
- COOH or NH 2 groups present on the proteins may also participate in the anchoring of the protein (as a surfactant) on the surface of the MOFs.
- substituted denotes the replacement of a hydrogen radical in a given structure with the radical of a substituent. specified.
- substituted for example means the replacement of a hydrogen radical in a given structure by a radical R 2 as defined above. When more than one position may be substituted, the substituents may be the same or different at each position.
- spacer ligand means a ligand (including, for example, neutral species and ions) coordinated to at least two metal sites M, participating in the distance between these metal sites and in the formation of empty spaces or pores.
- the spacer ligand can comprise several complexing functions comprising carboxylates, phosphonates, imidazolates, preferably from 2 to 6 functional groups which can be mono, bi-tri or tetradentates, that is, to include 1, 2, 3 or 4 points of attachment to the metallic site.
- the term "external surface” means the outer surface of the MOF materials, that is to say excluding the surface of the pores (micropores and / or mesopores) of the MOFs.
- alkyl means a linear, branched or cyclic, saturated or unsaturated, optionally substituted carbon radical comprising 1 to 25 carbon atoms, for example 1 to 10 carbon atoms, for example 1 to 10 carbon atoms. 8 carbon atoms, for example 1 to 6 carbon atoms.
- alkylene means a linear, branched or cyclic, saturated, optionally substituted divalent carbon radical comprising 1 to 25 carbon atoms, for example 1 to 10 carbon atoms, for example 1 to 8 carbon atoms. carbon atoms, for example 1 to 6 carbon atoms.
- alkenylene in the sense of the present invention, an alkylene radical, as defined above, having at least one carbon-carbon double bond.
- alkynylene in the sense of the present invention, an alkylene radical, as defined above, having at least one carbon-carbon triple bond.
- aryl means an aromatic system comprising at least one ring which satisfies Huckel's aromaticity rule. Said aryl is optionally substituted and may comprise from 6 to 50 carbon atoms, for example 6 to 20 carbon atoms, for example 6 to 10 carbon atoms.
- heteroaryl in the sense of the present invention, a system comprising at least one cycle 5- to 50-membered aromatic group of which at least one aromatic ring member is a heteroatom, in particular selected from the group consisting of sulfur, oxygen, nitrogen and boron.
- Said heteroaryl is optionally substituted and may comprise from 1 to 50 carbon atoms, preferably 1 to 20 carbon atoms, preferably 3 to 10 carbon atoms.
- amino in the sense of the present invention, a system of formula -N (R) 2 wherein each occurrence of R is independently H, C 1-6 alkyl, or C 6 -aryl, preferably H, C 1-6 alkyl, or phenyl.
- nitrogen heterocyclic means a saturated or unsaturated and nonaromatic mono- or polycyclic ring system comprising from 5 to 20 members, and optionally comprising one or more 5 or 6-membered rings having at least a nitrogen atom, and optionally between 1 to 2 other heteroatoms selected independently from each other from S, O, and N, wherein (i) each 5-membered ring has from 0 to 2 double bonds, and each ring to 6 links have from 0 to 3 double bonds, (ii) the sulfur and / or nitrogen atoms are optionally oxidized, and (iii) the nitrogen atoms are optionally in the quaternary salt form.
- a heterocyclic radical may be pyrrolidinyl, pyrazolinyl, pyrazolidinyl, imidazolinyl, imidazolidinyl, piperidinyl, piperazinyl, oxazolidinyl, isoxazolidinyl, morpholinyl, thiazolidinyl, isothiazolidinyl, or tetrahydrofuryl.
- three-dimensional structure is meant a three-dimensional succession or repetition of units of formula (I) as conventionally understood in the field of MOF materials, which are also characterized as "metallo-organic coordination polymers". ".
- surfactant means a molecule partially or wholly covering the surface of the solid for modulating the surface properties of the material, for example:
- stealth reticuloendothelial system
- surfactants can be used to combine the above properties.
- a surfactant combining at least two of the aforementioned properties can be used.
- the organic surface agent can be chosen for example from the group comprising:
- surfactant comprises one or more phosphate, phosphonate, bisphosphonate, sulfate, carboxylate, hydroxy, cathecolate, thiolate, nitrogenous heterocyclic (e.g., azolate, imidazolate), amido or amino group.
- the cyclodextrin units of poly- ⁇ , poly- ⁇ or poly- ⁇ -cyclodextrin or the copolymer of ⁇ , ⁇ and / or ⁇ -cyclodextrin may be linked together by hydrocarbon chains corresponding to the formula -0 - (CH 2 -CHOR 1 -CH 2 ) n ⁇ 0- where n is an integer between 1 and 50 and, in each of the units (CH 2 -CHOR 1 -CH 2 ), R 1 denotes either an atom of hydrogen, or a -CH 2 -CHOH-CH 2 -O- chain connected to a cyclodextrin unit of said polymer or copolymer.
- the poly-a, poly- ⁇ or poly- ⁇ -cyclodextrin or the copolymer of ⁇ , ⁇ and / or ⁇ -cyclodextrin can be obtained by polycondensation of cyclodextrin molecules and epichlorohydrin.
- the MOF solid according to the invention may comprise di-, tri- or tetravalent metal atoms.
- the metal atoms may have an octahedral, pentahedral geometry, tetrahedral, or even be in higher coordination in the structure of the material.
- coordination or “coordination number” is meant the number of bonds for which the two electrons shared in the bond originate from the same atom.
- the electron donor atom acquires a positive charge while the electron acceptor atom acquires a negative charge.
- the metal atoms can be isolated or grouped into inorganic entities.
- the MOF solid according to the invention may for example be constructed from chains of polyhedra, dimers, trimers, tetramers, pentamers or hexamers of polyhedra or a combination of these entities.
- the MOF solid according to the invention can be constructed from chains of octahedra, dimers, trimers or tetramers of octahedra.
- the MOF iron carboxylate materials according to the invention can be constructed from chains of octahedra bound by the vertices or edges or trimers of octahedra connected by a central oxygen atom.
- organic entity means a set of atoms containing at least two metals linked by ionocovalent bonds, either directly by anions, for example O, OH, Cl, F, etc., or by the organic ligand.
- MOF solid according to the invention can be in various forms or "phases" taking into account the various possibilities of organization and connections of the ligands to the metal or metal group.
- phase means a hybrid composition comprising at least one metal and at least one organic ligand having a defined crystalline structure.
- the crystalline spatial organization of the solid of the present invention is at the basis of the characteristics and particular properties of this material, and governs in particular the pore size, which has an influence on the specific surface of the material and on the adsorption characteristics, but also the density of the material, which is relatively low, the proportion of metal in this material, the stability of the material, the rigidity and flexibility of its structure, etc.
- MOF solid according to the invention can be isoreactive, that is to say comprise networks of the same topology.
- the solid of the present invention may comprise units which contain either a single type of metal ion or several types of metal ions.
- the solid of the present invention may comprise a three-dimensional succession of three different patterns.
- the solid of the present invention may comprise a three-dimensional succession of two different patterns.
- the pore size can be adjusted by choosing appropriate spacer ligands.
- the ligand L of the unit of formula (I) MOF solids of the present invention may be a ligand carrying several complexing functions including carboxylates, phosphonates, imidazolates, preferably the carboxylate group is a di-, tri-, tetra- or hexa-carboxylate selected from the group consisting of 30
- Xi 0 or S
- s represents an integer of 1 to 4,
- each occurrence of t independently represents an integer of 1 to 4,
- u represents an integer of 1 to 7
- R L1 and R L2 are independently H, halogen or an alkyl C l -C 6 (of preferably methyl or ethyl) and each occurrence of R L3 independently represents H, halogen (preferably F, Cl or Br), OH , NH 2 , NO 2 or C 1 -C 6 alkyl (preferably methyl or ethyl).
- the ligand L of the unit of formula (I) of the present invention may be a ligand di-, tri- or tetra-carboxylate selected from the group consisting of: C 2 H 2 (C0 ⁇ 2) 2 (fumarate) C 2 H 4 (C0 2 ⁇ ) 2 (succinate), C 3 H 6 (C0 2 ⁇ ) 2 (glutarate), C 4 H 4 (C0 2 ") 2 (muconate), C 4 H 8 (C0 2" ) 2 (adipate), C 7 Hi 4 (C0 2 ") 2 (azelate), C 5 H 3 S (C0 2 ⁇ ) 2 (2, 5-thiophènedicarboxylate), C 6 H 4 (C0 2 ⁇ ) 2 ( terephthalate), C 6 H 2 N 2 (C0 2 ⁇ ) 2 (2, 5-pyrazine dicarboxylate), Ci 0 H 6 (CO 2 ⁇ ) 2 (naphthalene-2, 6-dicarboxylate), C 2 H 8 (C) (
- the ligand L of the unit of formula (I) of the present invention may also represent 2,5 diperfluoroterephthalate, azobenzene 4,4'-dicarboxylate, 3,3'-dichloro azobenzene 4,4'-dicarboxylate, 3,3 '- dihydroxo azobenzene 4,4'-dicarboxylate, 3,3'-diperfluoro azobenzene 4,4'-dicarboxylate, 3,5,5 ', 5'-azobenzene tetracarboxylate, 2,5-dimethyl terephthalate, perfluorosuccinate, perfluoromuconate, perfluoro glutarate, 3, 5, 3 ', 5'perfluoro-4,4'-azobenzene dicarboxylate, 3,3'-diperfluoro azobenzene 4,4'-dicarboxylate.
- the ligand L of the unit of formula (I) of the present invention may also be an imidazolate, tetrazolate, phosphate or phosphonate ligand such as imidazole, 2-methylimidazolate, 2-ethylimidazole, 4, (imidazol-dicarboxyic acid). , 1,4-butanediyl bis (imidazole), purine, pyrimidine, benzimidazolate, piperazinediphosphonate, tetrazolylbenzoate.
- imidazole 2-methylimidazolate
- 2-ethylimidazole 4, (imidazol-dicarboxyic acid).
- 1,4-butanediyl bis (imidazole) purine
- pyrimidine benzimidazolate
- piperazinediphosphonate tetrazolylbenzoate.
- Ligand L may exhibit biological activity.
- the nanoporous hybrid solids according to the invention have a mineral part, the metal (iron), and an organic part, a ligand with two or more complexing functions (carboxylate, phosphate, amide, etc.).
- Incorporation of organic ligands that possess biological activity has the advantage of allowing controlled release of active molecules depending on the rate of degradation of the material (these are biologically active ligands mentioned above which are released during the degradation of the MOF material).
- the MOF material itself can be "bioactive", i.e., it is capable of releasing components having biological activity.
- the present invention also relates to MOF solids comprising biologically active ligands and / or encapsulating one or more active ingredients, with an activity that may be complementary or different, and their use for combination therapies.
- the combined therapy is carried out by salting out (i) the active ingredient encapsulated in the pores of the MOF material and (ii) biologically active ligands incorporated into the lattice (the framework) of the crystalline MOF material.
- it may be azelaic acid (H0 2 C (CH 2 ) 7 CO 2 H, dermatological agent with antineoplastic activity), meprobamate (anticonvulsant, sedative, muscle relaxant, anti-anxiety), aminosalicylic acid (anti-tuberculosis), chlodronate, pamidronate, zoledronate, alendronate and etidronate (curative treatment for postmenopausal osteoporosis), azobenzenes (antimicrobial activity, COX inhibitors), porphyrins or amino acids (Lys, Arg, Asp, Cys, Glu, Gin, etc.), 4-aminosalycic acid, pyrazinamide (antituberculous), dibenzofuran-4, 6- dicarboxylic acid (transtryretin inhibitor), dipicolinic acid (dihydrodipicolinate reductase inhibitor), glutamic acid, fumaric acid, succinic acid, suberic acid,
- the antimicrobial or anti-inflammatory activity (NSAIDs, COX inhibitors) of azobenzenes As such, the reader will be able to refer to the following references: G. Oros, T. Cserhati, E. Forgacs, Chemosphere 52, 2003, 185 [15], AM Bada, EMS Azzam, SMI Morsy, Bioorg. Med. Chem. , 14, 2006, 8661 [16] and WJ. Tsai, YJ Shiao, Lin SJ, Chiou WF, Lin LC, Yang TH, Teng CM, Wu TS, Yang LM, Bioorg. Med. Chem. Letters 16, 2006, 4440 [17].
- the ligand L may be a biologically active ligand selected from the group consisting of C 7 Hi 4 (C0 ⁇ 2) 2 (azelate); aminosalicylate (carboxylic, amino and hydroxo groups); chlodronate, pamidrontate, alendronate and etidronate (with phosphonate groups); meprobamate (with carbamate groups); porphyrins comprising carboxylate, phosphonate and / or amino groups; amino acids (Lys, Arg, Asp, Cys, Glu, Gln, etc.) which contain amino, carboxylate, amide and / or imine groups; azobenzenes comprising carboxylate, phosphonate, and / or amino groups; dibenzofuran-4,6-dicarboxylate, dipicolinate (pyridine-type mixed ligand with carboxylic groups); glutamate, fumarate, succinate, suberate, adipate, nicotinate, nicot
- the anion X of the unit of formula (I) of the present invention may be chosen from the group comprising OH ⁇ , Cl ⁇ , Br ⁇ , F ⁇ , R- (COO) n “ , PF 6 “ , NO 3 “ , S0 4 2 " , CIO4 “ , with R and n as defined above.
- the anion X of the unit of formula (I) of the present invention may be chosen from the group comprising OH “ , Cl “ , F “ , CH 3 -COO " , PF 6 " , C 10 4 " , or a ligand selected from the list above.
- the anion X may be selected from the group consisting of OH ", Cl", F "and R- (COO) n wherein R represents -CH 3, - C 6 H 3, 4 -CeH, -C 10 H 4 or -C6 (CH 3 ) 4 .
- the X anion may be in an isotopic form suitable for imaging techniques such as positron emission tomography (PET).
- PET positron emission tomography
- PET Positron Emission Tomography
- CPT is a nuclear medical imaging method that measures the metabolic activity of an organ in three dimensions by the emissions produced by positrons from the disintegration of a radioactive product injected into the body.
- PET is based on the general principle of scintigraphy, which consists in injecting a tracer whose behavior and biological properties are known to obtain an image of the functioning of an organ.
- This tracer is marked by a radioactive atom (carbon, fluorine, nitrogen, oxygen ...) which emits positrons whose annihilation itself produces two photons.
- the detection of the trajectory of these photons by the collimator of the PET camera makes it possible to locate the place of their emission and thus the concentration of the tracer at each point of the organ. It is this quantitative information that is represented in the form of an image showing in color the zones of high concentration of the tracer.
- PET can visualize the activities of cell metabolism: we speak of functional imaging as opposed to so-called structural imaging techniques such as those based on X-rays (radiology or CT-scan) which are limited to images of the 1 ' anatomy. Therefore, the positron emission tomography is a diagnostic tool that can detect certain pathologies that result in an alteration of normal physiology such as cancer. PET is also used in biomedical research, for example in brain imaging where it reveals the active regions of the brain during this or that cognitive activity similarly to what is done with functional magnetic resonance imaging.
- X may be 18 F ⁇ , which is a positron emitter and thus allows the use of the MOF solids of the invention for applications involving PET imaging.
- At least one occurrence of ligand X is 18 F ⁇ .
- the MOF solid according to the invention may comprise a percentage of metal in dry phase of 5 to 40%, preferably 18 to 31%.
- the mass percentage (% m) is a unit of measurement used in chemistry and metallurgy to designate the composition of a mixture or an alloy, that is to say the proportions of each component in the mixture.
- 1% m of a component 1 g of the component per 100 g of mixture or 1 kg of said component per 100 kg of mixture.
- the MOF solids of the present invention have the particular advantage of having a thermal stability up to a temperature of 400 ° C.
- the MOF solid of the present invention has the particular advantage of having a thermal stability of 120 ° C to 400 ° C.
- the MOF solid according to the invention may be in particulate form with a particle diameter of less than 4 ⁇ , preferably less than 1000 nanometers.
- the MOF solid according to the invention may have a pore size of 0.4 to 6 nm, preferably 0.5 to 5.2 nm, and more preferably 0.5 to 3.4 nm. .
- the MOF solid according to the invention may have a specific surface area (BET) of 5 to 6000 m 2 / g, preferably 5 to 4500 m 2 / g.
- BET specific surface area
- the MOF solid according to the invention may have a pore volume of 0.05 to 4 cm 2 / g, preferably 0.05 to 2 cm 2 / g.
- the pore volume means the accessible volume for the gas and / or liquid molecules.
- MOF materials comprising a three-dimensional structure of units of formula (I) can be in the form of a rigid or flexible structure.
- the MOF solid of the present invention can be in the form of a robust structure, which has a rigid framework and contracts only very little when the pores are empty, or in the form of a flexible structure, which can swelling and deflating varying the pore opening depending on the nature of the adsorbed molecules.
- These adsorbed molecules may be, for example, solvents and / or gases.
- the term "rigid structure” means structures that swell or contract only very slightly, that is to say with an amplitude of up to 10%.
- the MOF solid according to the invention may have a rigid structure that swells or contracts with an amplitude of 0 to 10%.
- the term "flexible structure” means structures that swell or contract with a large amplitude, in particular with an amplitude greater than 10%, for example greater than 50%.
- a MOF material of flexible structure can swell or contract with an amplitude of 10% to 300%, preferably 50% to 300%.
- the MOF solid according to the invention may have a flexible structure that swells or contracts with an amplitude greater than 10%, for example from 50 to 300%.
- the present invention can be implemented with MOF materials of rigid or flexible structure.
- MIL Metal Organic Framework
- ZIF Zeolite Imidazolate Framework
- certain solids according to the invention may have a higher number of possible phases compared to MOF materials conventionally encountered in the literature.
- different phases have been obtained for the iron (III) carboxylate solids according to the invention, for example MIL-53, MIL-69, MIL-88A, MIL-88B, MIL-88Bt, MIL-88C, MIL- 88D, MIL-89, MIL-100, MIL-101, MIL-102.
- These different phases are presented inter alia in international applications WO 2009/77670 and WO 2009/77671.
- MIL Solid State Sci. 2005, 7, 1096. [18];
- MIL-88A (a) Serre et al., "Role of solvent-host interactions that lead to very large selling of hybrid frame orks", Science, 2007, Vol. 315, 1828-1831 [20]; (b) Enhanced et al., "A isoreticular class of metal-organic frameworks with the MIL-88 topology", Chem. Comra. , 2006, 284-286 [21]; (c) Mellot-Draznieks et al., "Very large swelling in hybrid frameworks: a combined computational and power diffraction study", J. Am. Chem. Soc., 2005, Vol.
- MIL-88B, MIL-88C and MIL-88D For these structural types, the reader may refer to publications concerning the MIL-88A type above, namely, (a) Serre et al., "Role of solvent- host interactions that lead to very large swelling of hybrid frameworks ", Science, 2007, Vol. 315, 1828-1831 [20]; (b) Enhanced et al., "A new isoreticular class of metal-organic frameworks with the MIL-88 topology", Chem. Comm., 2006, 284-286 [21].
- MIL-100 Horcajada et al., "Synthesis and catalytic properties of MIL-100 (Fe), an iron (III) carboxylate with large pores", Chem. Comm., 2007, 2820-2822. [24]
- MIL-101 Férey et al., "Chromium terephthalate-based solid with unusally large volumes and surface area", Science, 2005, Vol. 309, 2040-2042.
- MIL-102 S. Surmount, F. Millange, C. Serre, T. Duren, M. Latroche, S. Bourrelly, PL Llewellyn and G. Ferey "MIL-102: A Chromium Carboxylate Metal Organic Framework with Gas Sorption Analysis” J. Am. Chem. Soc. 128 (2006), 46, 14890.
- MIL-125 (Ti) and MIL-125 (Ti) _NH 2 are examples of the following publications: (a) M. Dan-Hardi, C. Serre, T. Frot, L. Rozes, G. Maurin, C. Sanchez and G. Ferey: J. Am Chem. Soc. Comra. , 131, 2009, 10857-10859 A New Photoactive Crystalline Highly Porous Titanium (IV) Dicarboxylate [44]; (b) C. Zlotea, D. Phanon, M. Mazaj, D. Heurtaux, V. Guillerm, C. Serre, P. Horcajada, T. Devic, E. Magnier, F.
- AEPF alkaline-earth polymer framework
- VA Pena-O'Shea
- N Snejko A. Monge
- E. Gutierrez-Puebla "Dynamic calcium metal-organic framework acts as a selective organic solvent sponge"
- Chemistry, 16 (38), 11632 [46] C. Volkringer, J. Marrot, G. Ferey, T.
- MIL-88B_4CH 3 MIL-88B_CH 3 , MIL-88B_2CF 3 , MIL-88B_20H, MIL-88B_NO 2 , MIL-88B_NH 2 , MIL-88B_C1, MIL-88B_Br, MIL-88B_4F:
- T18O8 (OH) 4 [(C02) 2C6H4] 6 of rigid structure for example MIL-125
- MOF solid according to the invention may have a unit of formula chosen from the group comprising:
- X, nH 2 0 (X F, Cl, OH) of flexible structure
- MIL-88B-Br Fe 3 O [C 6 H 3 Br- (CO 2) 2 ] 3 .
- MOF materials of the same general formula (I) but of different structures This is for example the case of MIL-88B and MIL-101 solids.
- MIL-88B and MIL-101 solids the difference between MIL-88B and MIL-101 solids lies in the way ligands are connected to octahedron trimers: in solid MIL-101, ligands L assemble in the form of rigid tetrahedra, whereas in the solid MIL-88B, they form trigonal bipyramids, making possible the spacing between the trimers.
- the mode of assembly of these ligands can be controlled during the synthesis for example by adjusting the pH.
- the solid MIL-88 is obtained in less acidic medium than the solid MIL-101 as described in the international application WO 2009/77671.
- the MOF solid of the present invention may have a phase selected from the group consisting of: MIL-53, MIL-88, MIL-100, MIL-101, MIL-102 as described in International Application WO 2009/77671, ZIF-8, MIL-125 and UiO-66.
- the MOF solid according to the invention may comprise at least one metal having paramagnetic or diamagnetic properties.
- the MOF solid according to the invention may comprise one or more paramagnetic metals, which may be identical or different, which may be iron.
- the MOF solid according to the invention may comprise one or more paramagnetic metal ions, which may be identical or different, which may be chosen from Fe 2+ and Fe 3+ .
- MOF solid according to the invention can be used in imaging.
- the invention also the use of MOF solid according to the invention as a contrast agent.
- the contrast agents are characterized by their relaxivity. The larger it is, the greater the effect of the contrast agents.
- Relaxivity is the ability of contrast agents to modify the proton relaxation times of the water in the medium following the application of a magnetic field. It depends on the paramagnetic properties of the metals used but also on the quantity and mobility of the water molecules that co - ordinate with the metal in the first internal sphere, bringing the most important contribution, as well as in the outer sphere.
- These "coordination spheres" represent the atoms immediately attached to the metal center in the case of the 1st sphere; for the outer sphere, this represents the atoms located immediately beyond the first sphere.
- the structural characteristics of the solid of the present invention allow water to coordinate around the first sphere of coordination and to circulate in the pores which induces an effect on the T1 and T2 longitudinal relaxation times of the protons of the water.
- the relaxivity r 2 of the solid is sufficient for use in vivo during gradient echo experiments.
- the research work carried out by the inventors has allowed them to develop a flexible and flexible method of synthesis that makes it possible to obtain the MOF solids according to the invention having a particular isoreticular structural organization with good yields.
- the method makes it possible to obtain nanoparticles of desired dimensions and particle sizes and homogeneous pores.
- the invention also relates to a method for preparing a solid as defined in the present invention, comprising at least one reaction step (i) consisting of mixing in a polar solvent:
- At least one solution comprising at least one metal inorganic precursor in the form of metal M, a metal salt M or a coordination complex comprising the metal ion M in which M is as defined above.
- the method for preparing the solid of the invention may further comprise a step (iii) of fixing on said solid at least one organic surface agent as defined above.
- This fixing step (iii) can be carried out during or after the reaction step (i) or after a step of introducing (ii) a molecule of interest. See Examples 22, 23 and 24 of WO 2009/77671.
- a number of MOF solids with a modified outer surface are illustrated in the "Examples" section. It is understood that these examples are given for illustrative and not limiting.
- the surface modification methods of the MOF solids illustrated in the Examples are applicable and / or adaptable to all the MOF solids according to the present invention (eg, MOF solids based on a metal M different from Fe, with different ligands L, and / or encapsulating or not at least one active principle, a compound of cosmetic interest and / or a marker). For example, these methods can be implemented without difficulty for modifying the surfaces of all the MOF solids described in the present application.
- the ligand L ' may represent a ligand carrying a plurality of complexing functional groups comprising carboxylates, phosphonates, imidazolates, preferably a di-, tri-, tetra- or hexadentate carboxylate group chosen from the group comprising:
- a 1 , A 2 and A 3 represent independently wherein :
- R 3 is selected from the group consisting of an -OH radical, a -OY radical where Y represents an alkaline cation, a
- Xi 0 or S
- s represents an integer of 1 to 4,
- each occurrence of t independently represents an integer of 1 to 4, u represents an integer of 1 to 7,
- R L1 and R L2 are independently H, halogen or an alkyl C l -C 6 (of preferably methyl or ethyl) and each occurrence of R L3 independently represents H, halogen (preferably F, Cl or Br), OH , NH 2 , NO 2 or C 1 -C 6 alkyl (preferably methyl or ethyl).
- each occurrence of R 3 represents a hydrogen atom.
- each occurrence of the radicals R L1 , R L2 and R L3 represents a hydrogen atom.
- the ligand L 'used may be a di-, tri- or tetracarboxylic acid chosen from the group comprising: C 2 H 2 (CO 2 H) 2 (fumaric acid) , C 2 H 4 (CO 2 H) 2 (succinic acid), C 3 H 6 (CO 2 H) 2 (glutaric acid), C 4 H 4 (CO 2 H) 2 (muconic acid), C 4 H 8 (C0 2 H) 2 (adipic acid), C 7 H 4 (C0 2 H) 2 (azelaic acid), C 5 H 3 S (C0 2 H) 2 (2,5-thiophene dicarboxylic acid), C 6 H 4 (C0 2 H) 2 (terephthalic acid), C 6 H 2 N 2 (CO 2 H) 2 (2,5-pyrazine dicarboxylic acid), C 10 H 6 (CO 2 H) 2 (2,6-naphthalene acid) dicarboxylic acid), Ci 2 H 8 (C
- the ligand L 'used may also be chosen from the group comprising: 2,5-diperfluoroterephthalic acid, azobenzene 4,4'-dicarboxylic acid, 3,3'-dichloroazobenzene 4,4'-dicarboxylic acid, 3,3'-dihydroxoazobenzene 4,4'-dicarboxylic acid, 3,3'-diperfluoroazobenzene 4,4'-dicarboxylic acid, 3,5,5'-5'-azobenzene tetracarboxylic acid, 2,5-dimethyl terephthalic acid, perfluoro glutaric acid.
- the ligand L ' may also be a precursor of the ligand imidazolate, tetrazolate, phosphate or phosphonate such as imidazole, 2-methylimidazolate, 2-ethylimidazole, 4, (imidazol-dicarboxyic acid, 1-4).
- the synthesis of MOF materials can preferably be carried out in the presence of energy that can be provided by For example, by heating, for example hydrothermal or solvothermal conditions, but also by microwaves, by ultrasound, by grinding, by a process involving a supercritical fluid, etc.
- energy that can be provided by For example, by heating, for example hydrothermal or solvothermal conditions, but also by microwaves, by ultrasound, by grinding, by a process involving a supercritical fluid, etc.
- the corresponding protocols are those known to those skilled in the art. Nonlimiting examples of protocols that can be used for hydrothermal or solvothermal conditions are described, for example, in the international applications WO 2009/077670 and WO 2009/077670, and in the references cited therein for this purpose.
- the hydrothermal or solvothermal conditions whose reaction temperatures can vary between 0 and 220 ° C, are generally carried out in glass (or plastic) containers when the temperature is below the boiling point of the solvent.
- Teflon bodies inserted in metal bombs are used.
- the solvents used are generally polar.
- the following solvents may be used: water, alcohols, dimethylformamide, dimethylsulfoxide, acetonitrile, tetrahydrofuran, diethylformamide, chloroform, cyclohexane, acetone, cyanobenzene, dichloromethane, nitrobenzene, Ethylene glycol, dimethylacetamide or mixtures of these solvents.
- One or more co-solvents may also be added at any stage of the synthesis for better solubilization of the compounds of the mixture.
- These may include monocarboxylic acids, such as acetic acid, formic acid, benzoic acid, and the like.
- the co-solvent is a monocarboxylic acid
- the latter in addition to a solubilizing effect, also makes it possible to stop the crystalline growth of the MOF solid.
- the carboxylic function coordinates with iron, which will not be able to bind to another iron atom because of the absence of a second -COOH function on the co-solvent molecule.
- the growth of the crystal lattice is slowed down and stopped.
- a monocarboxylic co-solvent such as acetic acid, formic acid, benzoic acid, etc., thus makes it possible to reduce the size of the MOF solid particles obtained.
- the use of a monocarboxylic co-solvent can therefore promote the production of nanoparticles (particles of size ⁇ 1 ⁇ ).
- reaction step (i) can be carried out according to at least one of the following reaction conditions:
- reaction temperature 0 ° C to 220 ° C, preferably 50 to 150 ° C;
- stirring speed 0 to 1000 rpm (or rotation per minute), preferably 0 to 500;
- reaction time 1 minute to 96 hours, preferably 1 minute to 15 hours
- co-solvent selected from the group consisting of acetic acid, formic acid, benzoic acid; in the presence of a solvent is selected from the group consisting of water, alcohols R s -OH wherein R s is alkyl to C 6 linear or branched, dimethylformamide, dimethylsulfoxide, 1 acetonitrile, tetrahydrofuran, diethylformamide, chloroform, cyclohexane, acetone, cyanobenzene, dichloromethane, nitrobenzene, ethylene glycol, dimethylacetamide or mixtures thereof, miscible or not;
- a supercritical medium for example in supercritical CO 2 ;
- MOF materials can preferably be carried out under experimental conditions conducive to the formation of nanoparticles.
- a control of the following parameters may be important for the production of nanoparticles of MOF solids according to the invention:
- additives such as pH modifiers (acids, bases), mineralizers, or agents for stopping crystalline growth (monocarboxylic acid).
- the ranges of preferred values for each of these parameters may vary depending on whether the synthesis of the nanoparticles is carried out by the hydro / solvothermal route, by ultrasound or by microwaves. For example, a higher reaction temperature will generally be used for the hydro / solvothermal route (about 20-150 ° C) than for the ultrasound route (about 0 ° C).
- the inventors have also demonstrated that the particular structural characteristics of the solid of the present invention, in particular in terms of flexibility or pore size, which confer on it particularly advantageous properties, especially in terms of adsorption capacity, selective adsorption and purity. These materials therefore make it possible to selectively adsorb molecules, such as for example pharmaceutical molecules, with a favorable energy cost and a higher release time.
- the research work carried out by the inventors has allowed them to highlight the interest of MOF materials for the adsorption and transport of active ingredients.
- the invention also relates to the use of the MOF solid according to the invention, which comprises in its pores or on its surface at least one pharmaceutically active principle.
- the invention also relates to the use of the MOF solid according to the invention loaded in principle as pharmaceutically active drug.
- the pharmaceutically active principle may be contained either in the pores or on the surface of the solid according to the invention. This is what is meant in the remainder of this document by "MOF solid loaded in principle pharmaceutically active”.
- MOF solid loaded with component X means an MOF solid according to the invention containing in its pores or on its surface the component X.
- the component X can be adsorbed or bound by a covalent bond, by hydrogen bonding, by Van der Waals bond, by electrostatic interaction at the surface or in the pores of the MOF solid.
- This component X can be, as indicated above, a pharmaceutically active principle.
- active ingredient means a molecule that has a therapeutic effect. For example, it may be any molecule having therapeutic properties involved in the composition of a drug.
- nonsteroidal anti-inflammatory drugs NSAIDs
- abortives alpha-blockers
- alpha2-agonists aminoglycosides
- analgesics anesthetics
- local anesthetics anorectics
- 5HT3 antagonists antagonists
- Calcium Antiangorous, Antiarrhythmics, Antibiotics, Anticholinergics, Anticholinesterase
- Antidiabetics Antidiabetics, Antidiarrheals, Antidepressants, Antihistamines, Antihypertensives, Antimycotics, Anti-Malarials, Antiparasitics, Antipsychotics, Antipyretics, Antiretrovirals, Antiseptics, Antispasmodics, Antivirals, Antiemetics, Antiepileptics, Anxiolytics, Barbiturates, Benzodiazepines, Bronchodilators, Beta-blockers, Chemotherapeutic Agents, Corticosteroids, Diuretics, Loop Diuretics, Osmotic Diuretics, Depressants, Glucocorticoids, Hallucinogens, Hypnotics, Immunosuppressants, carbonic anhydrase inhibitors, neuraminidase inhibitors, proton pump inhibitors, TNF inhibitors, selective serotonin reuptake inhibitors, HMG-CoA reductase inhibitors (or statins), Kerato
- the MOF solid according to the invention has the advantage of having high adsorption or charge capacities.
- the solid of the invention has a favorable hydrophobic / hydrophilic internal microenvironment, particularly for the incorporation of amphiphilic molecules such as busulfan.
- it makes it possible to efficiently adsorb pharmaceutical molecules which present particular difficulties of encapsulation, for example because of their instability, their high reactivity, their low solubility, their strong tendency to crystallize, their hydrophilic, amphiphilic nature, etc. ..
- the solid according to the invention can be loaded with at least one pharmaceutically active ingredient which has one or more of the following characteristics: hydrophilic, amphiphilic, lipophilic, unstable, toxic, with a strong tendency to crystallize or substantially insoluble.
- toxic means a pharmaceutically active principle with toxic effects likely to hinder its use in medical or veterinary applications. It may be for example alkylating agents such as busulfan, cisplatin, nitrosoureas such as lomustine. The alkylating agents form, after metabolization, covalent bonds with the nucleic acids. The formation of these links can lead for example:
- substantially insoluble means a pharmaceutically active principle whose solubility is less than 0.1 mg / ml in water. It can be for example Busulfan.
- stable is meant a pharmaceutically active ingredient that can decompose, crystallize and / or react by losing its structure and activity. It can be for example Busulfan.
- the pharmaceutically active principle may be any molecule having a biological activity, such as by for example, a drug, in particular an anticancer agent, an antiviral agent, a nucleoside analog, modified or otherwise, a nucleic acid, an antibody, a protein, a vitamin, etc.
- hydrophilic active ingredients mention may be made, for example, of phosphate azide or not, CDV (cidofovir), 5-fluoroacil, citarabine.
- amphiphilic active principles there may be mentioned, for example, busulfan, doxorubicin chloride or imipramine chloride.
- Lipophilic active principles include, for example, tamoxifen, docetaxel, paclitaxel, ibuprofen, lidocaine, fat-soluble vitamins such as vitamins A (retinol), D (calciferol), E (tocopherol), Kl (phylloquinone), K2 (menaquinone).
- the solid according to the invention can be loaded with at least one pharmaceutically active principle chosen, for example, from the group comprising taxotere, busulfan, azidothymidine (AZT), azepithidine phosphate (AZTP), ibuprofen , cidofovir, antibiotics, gemcitabine, tamoxifen, zalcitabine (ddC), didanosine (ddl).
- at least one pharmaceutically active principle chosen, for example, from the group comprising taxotere, busulfan, azidothymidine (AZT), azepithidine phosphate (AZTP), ibuprofen , cidofovir, antibiotics, gemcitabine, tamoxifen, zalcitabine (ddC), didanosine (ddl).
- the solid according to the invention can be loaded with at least one pharmaceutically active principle chosen, for example, from the group comprising busulfan, azidothymidine (AZT), azidothymidine phosphate (AZTP), cidofovir, gemcitabine, 1 ' ibuprofen .
- at least one pharmaceutically active principle chosen, for example, from the group comprising busulfan, azidothymidine (AZT), azidothymidine phosphate (AZTP), cidofovir, gemcitabine, 1 ' ibuprofen .
- the solid according to the invention can be loaded with at least one compound of interest in cosmetics.
- compound of cosmetic interest means any active substance used in the formulation of a cosmetic preparation, that is to say a preparation intended to be brought into contact with various superficial parts of the human body, in particular the epidermis, the hair and capillary systems, the external organs, the teeth and the mucous membranes, with a view, exclusively or mainly, to cleanse, protect, perfume, maintain the human body in good condition, modify its appearance or correct its odor.
- active substance is meant a substance that ensures the effectiveness of the cosmetic preparation.
- the compound of cosmetic interest can be an active substance used in the preparation of any cosmetic preparation known to those skilled in the art, for example, hygiene products (eg, makeup remover, toothpaste, deodorant, shower gel, soap, shampoo). ), skincare products (eg, anti-wrinkle cream, day cream, night cream, moisturizer, floral water, exfoliation, milk, beauty mask, lip balm, tonic), hair products (eg, after-care) shampoo, straightener, gel, oil, hairspray, mask, dye), make-up products (eg, anti-ring, self-tanner, eyeliner, makeup, makeup, kohl, mascara, powder, skin whitening product, red to lips, nail polish), perfumes (eg, eau de Cologne, eau de toilette, perfume), sun products (eg, creams, after-sun and sun oils or lotions), shaving products and depilatory products (eg, aftershave, depilatory cream, shaving cream ), or preparations for baths and showers (e.g., bubble bath, bath oil
- the compound of interest in cosmetics may be chosen for example from the group comprising:
- an antioxidant for example, citric acid, beta-carotene, vitamin E, glycolic acid, glutathione, vitamin C, polyphenols, lycopene, flavonoids, tannins, anthocyanins, N-acetylcysteine (free antiradicals)
- an antioxidant for example, citric acid, beta-carotene, vitamin E, glycolic acid, glutathione, vitamin C, polyphenols, lycopene, flavonoids, tannins, anthocyanins, N-acetylcysteine (free antiradicals)
- a vitamin e.g. Vitamin A, B3, B5, B6, B2, B1, B9, B8, B12, C, E, D, K, K1, K2
- a liporegulator eg, caffeine, theophylline
- a photoprotective agent for example, benzophenone 3 (2-Hydroxy-4-methoxy)
- Benzophenone benzophenone 4 (2-Hydroxy-4-methoxybenzophenone-5-sulphonic acid), 2-phenylbenzimidazole-5-sulfonic acid)) a moisturizing agent (for example, urea, hyaluronic acid, sorbitol) .
- a moisturizing agent for example, urea, hyaluronic acid, sorbitol
- the solid according to the invention can be loaded with at least one compound of cosmetic interest selected from the group comprising benzophenone, visnadine, salicylic acid, ascorbic acid, benzophenone and its derivatives, the caffeine, urea, hyaluronic acid, etc.
- compound of cosmetic interest selected from the group comprising benzophenone, visnadine, salicylic acid, ascorbic acid, benzophenone and its derivatives, the caffeine, urea, hyaluronic acid, etc.
- the organic surface agent may further be functionalized with a fluorescent molecule.
- a fluorescent molecule for example, it may be rhodamines (for example rhodamine B), fluorescein, luciferase, pyrene and its derivatives, aminopyrrolidino-7-nitrobenzofurazan or quantum dots.
- quantum dots may be selected from cadmium selenide, cadmium sulphide, arsenide indium phosphide or selenide sulphide
- the active ingredient may be a fluorinated molecule; that is to say comprising at least one substituent F. It may be for example one of the fluorinated molecules mentioned above. These fluorinated molecules are suitable for use in imaging, particularly fluorescence imaging such as the aforementioned PET technique.
- the invention also relates to the use of MOF nanoparticles encapsulating one or more fluorinated molecules according to the invention as a marker that can be used in medical imaging, such as PET imaging.
- the solid according to the invention can be loaded in principle pharmaceutically active with a loading capacity of 1 to 200% by weight of dry solid, for example from 1 to 70% by weight of dry solid, that is to say nearly 10 to 700 mg per gram of dry solid.
- the charge capacity means the storage capacity of molecules or the amount of molecules adsorbed in the material.
- the load capacity can be expressed in mass capacity (gram / gram) or in molar capacity (mol / mol) or in others (mol / gram, gram / mol, etc.)
- MOF solid with external surface modified according to the invention has the advantage of allowing longer release times, in particular thanks to the internal micro-environment but also thanks to the structure of the compounds.
- surfactants with a size greater than that of the pore access windows of MOF materials functionalized with ligands highly complexing metals, such as iron (Fe 2+ , Fe 3+ ), zinc ( Zn 2+ ), zirconium (Zr 4+ ), titanium (Ti 4+ ), calcium (Ca 2+ ), magnesium (g 2+ ) and aluminum (Al 3+ ), provide both stable overlays, without disturbing the encapsulated molecules.
- the solid according to the invention may also comprise, for example on the spacer ligands, functional groups which can modify the interactions between the MOF solid according to the invention and the molecule of interest. This can control the encapsulation and release of the molecules of interest.
- the MOF materials of the invention can thus be adapted, formulated and designed ("designed") according to the molecules of interest to be transported in order to modulate the degree of encapsulation, the release of the molecules and / or the degradability of the solid.
- MOF solid according to the invention has been the subject of very positive toxicity studies, described in the "Examples" section below.
- the MOF solid of the present invention used for the transport of active principles makes it possible to overcome the problems of the prior art mentioned above, in particular the problems related to the instability of the recoveries of the MOF vehicle, in particular in a biological medium, and to their interference with the release of pore-encapsulated molecules from MOFs with a modified outer surface.
- the MOF solid according to the invention makes it possible to incorporate markers into this material, which is also of interest.
- the solid according to the invention can be loaded with at least one molecule of interest which can be a pharmaceutically active principle and / or a compound of interest in cosmetics and / or a marker.
- the molecule of interest can be contained either in the pores or on the surface of the solid according to the invention.
- the MOF solids according to the invention can be used for the manufacture of medicaments, cosmetic compositions and / or markers that can be used in medical imaging.
- a method of treating a subject affected by a disease comprising administering to said subject an MOF solid according to the invention comprising in its pores or on its surface at least one active ingredient known to treat said disease.
- the MOF solid according to the invention can be loaded with at least one marker selected from the group comprising a medical imaging marker, a contrast agent, a tracer, a radioactive marker, a fluorescent marker, a phosphorescent marker.
- the inventors describe in the "Examples" section below a surface modification with a fluorescent compound, in particular a cyclodextrin or a rhodamine-labeled polycyclodextrin.
- This modification allows the detection of particles using a confocal microscope.
- the Confocal Laser Scanning Microscope (CLBL) is an optical microscope that has the property of producing images of very shallow depth of field (about 600 nm) called “optical sections”. By positioning the focal plane the lens at different depth levels in the sample, it is possible to produce series of images from which we can obtain a three-dimensional representation of the object.
- One possible application is the study of interactions with cell lines.
- nanoparticles labeled with fluorescent compounds can be used in fluorescence imaging.
- the solid according to the invention can be loaded with at least one marker selected from the group consisting of: a fluorescent compound, an iron oxide, a gadolinium complex, gadolinium ions directly present in the structure, for example in the form complex with organic ligand, etc.
- the marker charge protocols are those known to those skilled in the art. Nonlimiting examples that can be used are described, for example, in A.K. Gupta, et al., Nanomed. 2007 2 (1), 23-39 [28]; in P Caravan, Chem. Soc. Rev. , 2006, 35, 512-523 [29]; or in Yan-Ping Ren, et al., Angew. Chem. Int. Ed. 2003, 42, No. 5, 532 [30].
- the MOF solid according to the invention can be used for the manufacture, transport and / or vectorization of markers.
- the solid of the invention can be used for the vectorization of drugs when loaded in principle pharmaceutically active and / or for the detection and monitoring of diseases involving biological targets (such as cancer) when it is used as a marker.
- the solid of the present invention advantageously allows to visualize the biodistribution of a drug. This is of great interest, especially for monitoring a treatment therapy and the study of the biodistribution of a drug.
- the process for preparing the solid according to the invention may further comprise a step (ii) of introducing into the pores or on the surface of the MOF solid at least one molecule of interest, which may be a pharmaceutically active ingredient and / or a compound of interest in cosmetics and / or marker.
- Said introduction step may be carried out during the reaction step (i) or after it so as to obtain a solid loaded with a molecule of interest.
- the molecule of interest can for example be introduced into the MOF material of the present invention:
- MOFs materials of the present invention therefore constitute improved compounds capable of escaping the immune system and / or their capture by certain organs, for example the liver, thus avoiding their accumulation in these organs, and capable of vectorizing active ingredients to specific targets.
- the improved MOF surface modification method presented in this patent application enables:
- These compounds are capable of transporting and active principles, for example active principles presenting particular difficulties of encapsulation related to their instability, their strong tendency to crystallize, their low solubility, their amphiphilic, hydrophilic character, etc.
- the phosphated cyclodextrins were used as surfactants according to the invention.
- Cyclodextrins (CD) are very good candidates because they are larger than the pore access windows of iron trimesate MIL-100 (Fe), one of the nanoMOFs with the largest pores (see Figures 1 and 2). ).
- Fe iron trimesate MIL-100
- These cyclodextrins have been functionalized with phosphate groups able to bind stably by coordination with the unsaturated sites of iron, zinc, zirconium, titanium, calcium, magnesium and / or aluminum at the surface of the MOFs.
- the strategy proposed in the present application uses the grafting of groups, that is to say complexing force equivalent or greater than that of phosphates, in sufficient number to increase the surface adhesion of the MOF of the organic surfactant (cooperative effect).
- the surface modification according to the invention can be obtained by simple incubation in the cyclodextrin phosphate (CD-P) solutions. This is an easy and fast method (less than 15 minutes) which also has the advantage of a "green galenic" (although for the encapsulation of hydrophobic molecules, an organic solvent can be used). Indeed, the surface modification does not require the addition of any organic solvent, surfactant or other chemical to be removed at the end of the reaction. This method could therefore be extrapolated on an industrial scale.
- the crystallinity and the pore volume of the MOFs modified with the phosphate cyclodextrins are not affected, unlike the PEG surface agents described in the application WO 2009/077671. Indeed, the pore volume of the samples grafted with the cyclodextrin-phosphate is close to that of the initial solid (see Figure 7A).
- recoveries of CD-P have an effect beneficial to the stability of nanoMOFs, in that they do not aggregate even after several days of incubation in water (Figure 10). This aspect is particularly important for applications (biological, cosmetic) and for the storage of MOF particles.
- the aforementioned advantages and properties for externally modified MOFs with cyclodextrin-phosphate can also be obtained with the other surfactants according to the present invention, namely monomers, oligomers or cyclodextrin polymers; branched polyethylene glycol groups; the proteins ; polysaccharides carrying a plurality of polyethylene glycol side chains; or water-insoluble polysaccharides at 6 ⁇ pH ⁇ 8 and soluble in water at pH ⁇ 5, which are complexed to a metal center M or to a ligand L located at the surface of the crystalline MOF solid via one or more groups (S) phosphate, phosphonate, bisphosphonate, sulfate, carboxylate, azolate (eg, imidazolate), amido and / or amino.
- S groups
- Figure 1 Schematic representation of a surface-modified porous MOF with surfactants having several groups for interacting with metal centers or surface ligands, and having:
- a rigid section larger than the size of the largest windows of the material for example, cyclodextrins
- (B) A rigid section smaller than the size of the largest windows of the material, but groups distributed over the entire length of the main chain of the surfactant (for example, dextran grafted with alendronates).
- FIG. 3 X-Ray Diffraction or XRPD diffractograms of a MOF MIL-100 before and after ⁇ treatment.
- FIG. 4 FT-IR spectrum of ⁇ , of MOF MIL-100 and of MOF MIL-100 with surface modified with ⁇ .
- FIG. 5 Modification kinetics of MIL-100s by ⁇ with two weight ratios of different nanoparticles / ⁇ : mass ratio of 1: 0.5 or 1: 2 (solid line and dotted line, respectively)
- FIG. 6 Representation of the Potential- ⁇ of modified and unmodified MIL-100 nanoparticles as a function of their incubation time.
- FIG. 8 Interaction between the nanoparticles of MIL-100 and the ⁇ MIL-100 (A) or the PCDPMIL-100 (B) obtained by ITC characterization.
- Figure 9 Stall kinetics of the release of pCDP-rhodamine in PBS or in RPMI supplemented with 10% bovine serum.
- Figure 17 Release kinetics of poly-pCDP-rhodamine in PBS medium at 37 ° C.
- Figure 18 Schematic representation of the surface modification of MIL-100 nanoparticles by chitosan via electrostatic interactions.
- Figure 19 Evolution of the average diameter of the MIL-100 and MIL-100 / chitosan nanoparticles after dilution of the initial suspensions in milliQ water. Dilution factor: 100.
- Figure 20 X-ray diffractograms of MIL-100 and MIL-100 modified with chitosan.
- Figure 21 Kinetics of release of AZT-TP from MIL-100 and MIL-100 modified with chitosan (post-encapsulation modification of AZT-TP). 22: Schematic representation of the association of chitosan with MIL-100 nanoparticles by electrostatic interactions and addition of Na 2 S0 4 .
- Figure 23 Particle size distribution of MIL-100 / Chitosan microparticles. Mass ratio MIL-100 / chitosan: 20/1.
- Figure 24 IR spectra of chitosan (solid black line), MIL-100 nanoparticles (black dots) and MIL-100 / chitosan microparticles mass ratio 10/1 (gray solid line) and 5/1 (gray dotted lines).
- Figure 25 RX diffractograms of the MIL-100s and the MILs
- Figure 26 Release kinetics of AZT-TP from MIL-100 and MIL-100 / chitosan microparticles (post-encapsulation modification).
- Figure 28 Stall of CDP-rhodamine from MIL-100 nanoparticles (Fe) in PBS at 37 ° C.
- Figure 29 Stall of CDP-rhodamine from nanoparticles of MIL-100 (Al) in PBS at 37 ° C.
- the synthesis of MIL-89nano is made from iron acetate (1 mmol, synthesized according to the procedure described in CT Dziobkowski, TJ Wrobleski, Brown DB, Inorg Chem 1982, 21, 671 [51]) and Muconic acid (1 mmol, Fluka, 97%) in 5 ml of ethanol (Riedel-de Ha ⁇ n, 99.8%) with the addition of 0.25mL of 2M sodium hydroxide (Alfa Aesar, 98%) in an autoclave ( Paar bomb) at 100 ° C for 12h. After cooling the container, the product is recovered by centrifugation at 5000 rpm for 10 minutes.
- the particle size measured by light scattering is 400 nm.
- the nanoparticles show a rounded and slightly elongated morphology, with a very homogeneous particle size of 50-100 nm.
- the particle size measured by light scattering is 250 nm. SEM images show elongated particles with edges. There are two particle sizes, -500 nm and 150 nm.
- MIL-100 nanoparticles were obtained by hydrothermal synthesis under microwave irradiation (Mars 5 CEM), by heating an aqueous suspension containing 20 ml of deionized water, 8.97 mmol FeC13 (FeCl 3 '6H 2 0, 98% Alfa Aesar) and 4.02 mmol of 1, 3, 5-benzenetricarboxylic acid (BTC, Sigma Aldrich) for 6 min at 130 ° C. with stirring.
- Table 1 reaction conditions for hydrothermal synthesis of MOF MIL-100 (Fe)).
- Table 1 Microthermal assisted hydrothermal synthesis of MOF MIL-100 (Fe)
- the nanoparticles were recovered by centrifugation at 5600xg for 15 min and they were activated by 6 washes with 30 ml of absolute EtOH. Once activated, they were re-dispersed in EtOH, sonicated with a probe u.s. up to a size ⁇ 300nm and a PDI ⁇ 0.3. Finally, the MIL-100s were centrifuged for 15 min at 5600xg, the supernatant was removed and the nanoparticles were stored at room temperature until the time of analysis.
- FeCl 3 .6H 2 O (1 mmol, Alfa Aesar, 98%) and acid 1, Benzenedicarboxylic acid (1.5 mmol, 1.4-BDC Aldrich, 98%) in 10 mL of dimethylformamide (Fluka, 98%) is placed in a bomb Paar and heated at 100 ° C for 15 hours. The solid is recovered by centrifugation at 5000 rpm for 10 minutes.
- the product is heated at 200 ° C under vacuum for 1 day. Store under vacuum or inert atmosphere as product is not air stable.
- the particle size measured by light scattering is 310 nm.
- the MIL-88Btnano solid is synthesized from a solution of FeCl 3 .6H 2 O (1 mmol, Alfa Aesar, 98%) and 1,4-benzenetetramethyldicarboxylic acid (1 mmol, Chem Service) in 10 mL of dimethylformamide ( Fluka, 98%) with 0.4 mL of 2M NaOH. This solution is placed in a bomb Paar and heated at 100 ° C for 2 hours. After cooling the container with cold water, the product is recovered by centrifugation at 5000 rpm for 10 minutes.
- Measurement of particle size by light scattering shows two populations of nanoparticles of 50 and 140 nm.
- the nanoparticles of the solid MIL-88Btnano have a spherical morphology with a size of 50 nm. Only a minority fraction has a size of 200 nm. Agglomerates of small particles can also be observed.
- the solid MIL-88Bnano is synthesized from a solution of iron acetate (1 mmol, synthesized according to the procedure described in CT Dziobkowski, TJ Wrobleski, DB Brown, Inorg. Chem. 1982, 21, 671) and 1,4-benzenedicarboxylic acid (1 mmol, 1.4-BDC Aldrich, 98%) in 5 mL of methanol (Aldrich, 99%). This solution is placed in a bomb Paar and heated at 100 ° C for 2 hours. After cooling the container with cold water, the product is recovered by centrifugation at 5000 rpm for 10 minutes.
- Measurement of particle size by light scattering shows a bimodal distribution of nanoparticles of 156 and 498 nm.
- the morphology of the particles is very irregular, with a size of 300 nm.
- [31]) is made from a solution of Zn (NO 3 ) 2 ⁇ 6H 2 O (2.933 g, 9.87 mmol, 98% Sigma-Aldrich) in 200 mL of methanol (Aldrich, 99%). This solution is poured into a solution of 2-methylimidazole (Hmim, 6.489 g, 79.04 mmol, 99% Aldrich) in 200 ml of methanol with stirring at room temperature for 1 hour. The product is recovered by centrifugation at 10500rpm for 15 minutes.
- 2-methylimidazole Hmim, 6.489 g, 79.04 mmol, 99% Aldrich
- Zr zirconium terephthalate UiO-66
- synthesis of nanoparticles of zirconium terephthalate UiO-66 (Zr) nano is carried out from a solution of ZrOCl 2 -8H 2 0 (3.22 g, 10 mmol; 99% Sigma-Aldrich) and acid 1, 4-benzenedicarboxylic acid (1.662 g, 10 mmol; 1,4 BDC Aldrich, 98%) in 50 mL of dimethylformamide (DMF; Fluka, 98%) at 130 ° C for 2 hours.
- DMF dimethylformamide
- the synthesis of nanoparticles of aluminum trindicate MIL-100 (Al) nano is carried out by dispersing 1.21 grams (0.05 mol) of methyl 1,3-5-benzenitricarboxylate in 20 ml of water with the aid of Ultrasound cane (20 sec at 20% then 20 sec at 30%). The mixture is then stirred magnetically and 2.6629 g of aluminum nitrate nonahydrate is poured. Then 4 mL of 4 M nitric acid is added to the resulting dispersion, which is further stirred for 5 minutes before heating. The synthesis is carried out under microwave irradiation at 210 ° C for 30 min with a heating ramp of 10 min.
- the reactor was removed from the microwave oven when the temperature dropped to 90 ° C and the reactor cooled in an ice bath.
- the solid is recovered by centrifugation at 10,500 rpm for 20 minutes.
- the deposit pellet
- the deposit is redispersed in 30 ml of methanol and kept under magnetic stirring overnight.
- the dispersion is finally centrifuged using the conditions described above to obtain a yellow solid.
- the particle size measured by light scattering is 120 nm.
- particle size determination by light scattering was performed on a Malvern Zetasizer Nano series - Nano-ZS apparatus; Zen model 3600; Serial No. 500180; UK.
- NanoMOF Organic-inorganic hybrid nanoparticles based on iron trimesate, (MIL-100) were modified with ⁇ cyclodextrin phosphate ( ⁇ ⁇ , Cyclolab, CY-2017.1, molecular formula: C4 2 H 7 O047 P4 a4 ).
- the weight percentage of ⁇ bound to MIL-100 was calculated on the basis of the phosphorus content of the modified sample (P% w / p M iL-100o CDPJ) and ⁇ (P% w / p pC Dp) according to the following formula:
- MIL-100 2 mg were incubated with 500 ⁇ l of an aqueous solution of ⁇ 2 mg / ml for different incubation times (1 h, 4 h, 8 h, 24 h), with stirring, at room temperature.
- the nanoparticles were recovered by centrifugation at 5600xg 10 min, washed twice with water, and resuspended in a 0.5 mM KCl solution.
- the surface charge of MIL-100 was analyzed by de potential measurements (Zetasizer Nano 6.12, Malvern Instruments Ltd., UK).
- Table 2 Atomic composition of nanoparticles of MIL-100 unmodified and modified with CDP.
- MIL-100 30 mg were incubated with 2 mL of PEG aqueous solution 5 mg / mL, 3 h, 30 C, with shaking. At the end of the incubation, the nanoparticles were recovered by centrifugation at 5600xg 10 min and dried for 6 h at 100 °. The porosity of the materials was analyzed by nitrogen adsorption porosimetry at 77 K.
- MIL nanoparticles 100 were incubated with 2 ml of an aqueous solution of PEG star 0.5 mg / mL (dPEG TM Amino- (4) - [dPEG TM (12) -OMe] 3, C 99H197 5O47, 2209 , 63 g / mole, Iris Biotech, Germany) at room temperature with two-dimensional stirring, for 2 minutes.
- PEG star 0.5 mg / mL
- the nanoparticles were recovered by centrifugation at 5600xg 10 min, followed by two washes with water.
- PEG was measured in the supernatants recovered after the first centrifugation using a colorimetric method (Baleaux [33]).
- MIL 100 nanoparticles were incubated at room temperature with two-dimensional stirring for 2 minutes with 1 mL of ethanol and 1 mL of a linear PEG 0.5 mg / mL aqueous solution carrying at each end of chain: a methoxy group and a carboxyl group (alpha-Methoxy-omega-carboxylic acid poly (ethylene glycol), 5,000 Da, Iris Biotech, Germany, MeO-PEG-COOH) a methoxy group and an amino group (alpha-Methoxy-omega-amino poly (ethylene glycol), 5,000 Da, Iris Biotech, Germany, MeO-PEG-NH 2 ) an amino group and a carboxyl group (alpha-Amino-omega).
- a methoxy group and a carboxyl group alpha-Methoxy-omega-carboxylic acid poly (ethylene glycol), 5,000 Da, Iris Biotech, Germany, MeO-PEG-COOH
- the reaction medium With the aid of an ice bath, the reaction medium is brought back to ambient temperature. Using a 50% aqueous NaOH solution (by mass), the pH is brought to 4.3 to promote the precipitation of bisphosphonic acid. The precipitate is filtered and dried under vacuum. Purification of alendronate involves several washes with anhydrous methanol until methanesulfonic acid is removed. The precipitate is then dried overnight at the heated desiccator (at 40 ° C).
- Step 2 Coupling alendronate-PEG5000-COOH (PEG-alendronate)
- Alendronate (7.8 mg, 0.9 eq) is solubilized in 1 ml of water.
- the pH is adjusted to 10 with a few drops of triethylamine.
- the solution is then added dropwise to the activated PEG solution, and the pH is adjusted up to one more time.
- the solution is stirred for 24 hours in the incubator at 37 ° C.
- the porosity of the dried nanoparticles was analyzed by nitrogen adsorption at 77 K.
- the BET specific surface area decreased from 1400 to 1050, 1120, 1160, 1270 and 1320 m 2 / g in the case of MeO-PEG-COOH, MeO -PEG-NH 2 , NH 2 -PEG-COOH and, star-shaped PEG and PEG-alendronate, respectively.
- This demonstrates that these linear end-chain functional PEGs rapidly penetrate the pores of the MIL nanoparticles 100.
- the surface charge does not change after functionalization with the branched PEG (potential ⁇ ⁇ -25 mV).
- Rhodamine B isocyanate ("Rhodamine B isothiocyanate" or "RBITC”). in English) have been added.
- the mixture was heated to 60 ° C with stirring. After 4 h, the temperature was raised to 90-100 ° C and 54 mg (0.1 mmol) of Rhodamine B isocyanate was added. After stirring for 3 h, the reaction medium was brought to room temperature and precipitated by adding 20 ml of acetone.
- the freshly prepared compound (1) (227 mg, 0.2 mmol) was dispersed in 5 ml of pyridine (5 ml) at room temperature, 82 mg (0.21 mmol) of fluorescein isocyanate ("fluorescein isothiocyanate" or " FITC "in English) were added and the reaction mixture was brought to 60 ° C. After stirring for 3 h, the temperature was raised to 90 ° -100 ° C. and 39 mg (0.1 mmol) of fluorescein isocyanate were added. After stirring for 2h, the reaction mixture was cooled to room temperature and precipitated by adding 20 ml of acetone.
- the crude product was filtered, washed twice with acetone (1 mL), dispersed in water (50 mL) and extracted three times with pre-saturated ethyl acetate with water ( 50 mL) to remove residual fluorescein isocyanate.
- the aqueous phase was evaporated at 60 ° C under reduced pressure.
- PhP 3 8 mg (0.03 mmol) PhP 3 were dispersed with stirring in 15 ml of anhydrous DMF. To this solution, 8 mg (0.03 mmol) of I 2 was gently added for 10 min being careful that the temperature did not exceed 40 ° C. 2.1 g of poly-BCD was then added, the temperature raised to 50 ° C and the solution was stirred at atmospheric pressure for 7 h. The suspension was cooled to about 50 ° C, 5 ml of CH 3 OH was added and the suspension was stirred for 30 min. CH 3 OH was then removed under reduced pressure and DMF ( ⁇ 2 mL) was added until a solution was obtained. 4 mg (0.062 mmol) of NaN 3 were added and the temperature brought to 100 ° C for 3h.
- 6-monodeoxy-6-mono [(5/6) -rhodaminylthioureido] - ⁇ - ⁇ (8) 0.8 mg of compound (7) was dissolved in 10 ml of pyridine. 10 mg (10 L, 0.05 mmol) of DBU and then 6 mg (0.01 mmol) of RBITC were added and the solution was heated at 60 ° C for 18h. The solvent was evaporated under reduced pressure (60 ° C, 10 mbar). The crude product was redispersed in 50 ml of water and extracted three times with 100 ml of DCM.
- aqueous phase was evaporated and the solid was redispersed in 50 ml of water and extracted three times with pre-saturated ethyl acetate with 100 ml of water.
- the aqueous phase was dialyzed three times and lyophilization gave the product (8) as a violet powder (0.6 g).
- IR v / cm -1 3391, 2924, 1721, 1649, 1591, 1418, 1339, 1157, 1082, 1033, 858, 757.
- IR v / cm -1 3402, 2925, 1738, 1653, 1592, 1506, 1465, 1328, 1151, 1110, 1082, 1041, 853.
- the phosphorylation steps of poly-pCDs are illustrated in Figure 17.
- Example 6 Characterization ITC (Isothermal Titration Calorimetry" in English) of the MIL-100 MOFs with External Surface Modified with the ⁇ -CDP of Example 2b)
- ITC thermodynamics of surface modification reaction of nanoparticles by ITC was characterized.
- Example 7 Stability of PCDP-based recouyrement.
- the results obtained indicate that the amount of CDP-rhodamine associated with the MIL-100s represents 30.5 (10.1)% w / w. These results are in agreement with those obtained by elemental analysis.
- the modified nanoparticles were washed with 1 ml of water in order to eliminate the excess of CDP-rhodamine and finally incubated in 1 ml of PBS (Phosphate Buffered Saline, Lonza) or RPMI 10% FBS (RPMI 1640 GlutaMAX TM added of fetal bovine serum 10% (v / v), 100 IU / mL penicillin-streptomycin), at 37 ° C, with shaking.
- PBS Phosphate Buffered Saline, Lonza
- RPMI 10% FBS RPMI 1640 GlutaMAX TM added of fetal bovine serum 10% (v / v), 100 IU / mL penicillin-streptomycin
- Example 9 Use of MIL-100 for release of AZT-TP after modification with PCDP or MeO-PEG-NH 2
- we recovered the nanoparticles by centrifugation at 5600xg 10 min and analyzed the supernatant using a scintillation counter to quantify drug release after surface modification.
- the nanoparticles were incubated in 1 ml of PBS at 37 ° C. with stirring. After various incubation times the suspension was centrifuged for 10 min at 5600 ⁇ g, 500 ⁇ l of supernatant was removed and replaced with the same amount of fresh medium. The supernatant was analyzed by a scintillation counter to evaluate the release of AZT-TP by unmodified nanoparticles, modified with ⁇ or MeO-PEG-NH2.
- the results summarized in fig. 11 show that the surface modification with ⁇ does not affect the release of the drug, probably because, as already stated, they only interact with the surface of nanoparticles without disturbing the internal porosity of the particles.
- the murine macrophage cell line, J774, (ECACC # 91051511) was cultured in RPMI 1640 GlutaMAX TM supplemented with inactivated bovine fetal serum (10% (v / v)) penicillin (100 IU / mL) and streptomycin (100 g / mL).
- the cytotoxicity of the MIL-100s to this line was determined by an MTT assay in 96-well plates (10 4 cells per well) after 48 hours of incubation with solutions of nanoparticles differently concentrated. The results showed that MIL-100s have no significant cytotoxic effect at high concentrations (100 mM), and the same results were observed after modification with ⁇ .
- MIL-100 were labeled with a fluorophore: adenosine 5'-triphosphate BODIPY-FL (BODIPY ATP, adenosine 5'-triphosphate, BODIPY ® FL, Invitrogen).
- BODIPY ATP adenosine 5'-triphosphate
- BODIPY ® FL Invitrogen
- 1.25 mg of MIL-100 were incubated with 500 L of an aqueous solution of ATP-BODIPY 10 nmol / ml, 1 h, with stirring, in the dark at room temperature.
- the nanoparticles were recovered by centrifugation at 5600xg 10 min, and the supernatant was analyzed by spectrofluorometry to quantify the rate of fluorophore uptake.
- the nanoparticles were then incubated in 500 ⁇ l of water (unmodified sample) or an aqueous solution of ⁇ 1.25 mg / ml, stirring for 1 h at room temperature in the dark. At the end of the incubation, the nanoparticles were recovered by centrifugation at 5600xg 10 min and resuspended in 10% SFV RMPI at the final concentration of 50 g / ml.
- the cells of the J774 line were previously cultured in 24-well plates (5 x 10 4 cells per well) on a sterile glass slide.
- Example 12 Comparative Example of Modification of the Surface of an MOF with a Dextran-Biotin Not Functionalized with a Complexing Group According to the Invention
- the results obtained indicate that the amount of CDP-rhodamine associated with the MIL-100s represents 34 ( ⁇ 0.5)% w / w.
- the modified nanoparticles were washed with 1 ml of water to remove the excess poly-CDP-rhodamine and finally incubated in 1 ml of PBS (Phosphate Buffered Saline, Lonza) at 37 ° C. with stirring at room temperature. concentration of 2 mg / ml. After various incubation times (0.3-6-24 h) the suspension was centrifuged for 10 min at 9500 g, then 500 L of the supernatant was removed and replaced with the same amount of fresh medium.
- PBS Phosphate Buffered Saline, Lonza
- NanoMOF Organic-inorganic hybrid nanoparticles based on iron trimesate (MIL-100) have been modified with chitosan.
- Chitosan is a naturally occurring polysaccharide obtained by deacetylation of chitin, the formula of which is given below (DDA is the degree of deacetylation of chitosan (DDA: degree of deacetylation)).
- This polymer consisting of glucosamine units linked together by ⁇ (1-4) bonds, has the advantage of being biodegradable and biocompatible. In addition, it has bioadhesive properties.
- the water-insoluble chitosan may be solubilized in an acidic medium such as a 1% acetic acid solution (AA1%); the amino groups distributed along the polymer chain are then protonated and the polymer is positively charged.
- the nanoparticles of MIL-100 comprise Fe 3+ cations and also COOH groups derived from the trimesic acid used for their synthesis (pKa 3, 4).
- the surface modification by chitosan is based on the multitude of electrostatic interactions between the polymer and the nanoparticles of MIL-100 in AA1% medium (FIG. 18).
- the interaction between the chitosan and the nanoparticles can be enhanced by addition of a salt such as Na 2 SO 4 which causes the loss of solubility of chitosan and makes it possible to increase the amount of polymer attached to the surface of the nanoparticles.
- MIL-100 nanoparticles were obtained by hydrothermal synthesis under microwave irradiation (Mars 5 CEM), by heating an aqueous slurry containing 20 mL of deionized water, 8.97 mmol of FeCl 3 (FeC13 "6:20 98% Alfa Aesar) and 4.02 mmol of 1,3,5-benzenetricarboxylic acid (BTC, Sigma Aldrich) for 6 minutes at 130 ° C. with stirring.
- nanoparticles were recovered by centrifugation at 5600xg for 15 min.
- the activation of the particles ie the extraction of the BTC from the pores
- the size of the nanoparticles was measured by quasi-elastic light scattering (Nanosizer, Malvern, France). Table 3 shows the results obtained on the day of formation of MIL-100 / chitosan (10) and after 30 days storage at room temperature (20 ° C.). The analysis showed a slight increase in the average diameter of the nanoparticles after covering with chitosan (213 ⁇ 3 nm vs 178 ⁇ 3 nm). Similarly, the polydispersity index goes from 0.05 for MIL-100 to 0.26 for MIL-100 / chitosan. After 30 days of storage, aggregation of the particles was observed in the unmodified sample. On the other hand, MIL-100 nanoparticles coated with chitosan have retained their average diameter.
- Table 3 Average diameter of MIL-100 nanoparticles covered or not with chitosan.
- the colloidal stability of the nanoparticles was also evaluated by diluting the suspensions by a factor of 100 in milliQ water and following the evolution of the average diameter in the diluted sample (Figure 19).
- MIL-100 / chitosan nanoparticles were prepared using chitosan labeled with rhodamine isothiocyanate (chitosan-RITC) with a mass ratio MIL-100 / chitosan: 4/1. After contacting the MIL-100s and the chitosan solution for 1, 2 and 24 h, the samples were centrifuged, purified and resuspended in milliQ water as previously described (see methods). The supernatants resulting from the centrifugation of the samples as well as from the purification were analyzed by spectrofluorimetry. It has been shown that chitosan is associated with MIL-100 with a level of about 2% w / w.
- the rhodamine-ITC-labeled nanoparticles were resuspended in 1 mL of phosphate buffer pH 7.4. After 24 h incubation at RT in this medium, the samples were centrifuged and the supernatants were analyzed by spectrofluorimetry. Chitosan-RITC was not detected in supernatants indicating that the MIL-100 / chitosan combination was stable under the experimental conditions tested.
- MIL-100 by chitosan did not alter the crystalline structure of the material (Fig. 20). Porosimetry of nitrogen adsorption of MIL-100 after modification with chitosan
- MIL-100 showed a Langmuir surface of 2100 m 2 / g while MIL-100 / chitosan showed a Langmuir surface of 2030 m 2 / g. It also shows that chitosan does not block pore access and so this is consistent with the presence of chitosan only on the surface of the particles.
- Nanoparticles modified with chitosan were incubated with a solution of AZT-TP. After 24 hours of contact, the samples were centrifuged and the encapsulated AZT-TP was determined. It has been shown that even after modification, MIL-100 nanoparticles retain their ability to encapsulate AZT-TP. The encapsulation efficiency was 99% corresponding to a nanoparticle association rate of 7.8% (w / w). These results were similar to those obtained for MIL-100s in the absence of any recovery. In addition, nanoparticles of MIL-100 encapsulating AZT-TP were modified by chitosan (post-encapsulation modification). It has been shown that the process of This modification dislodged only 4% of the encapsulated PA by a dilution effect due to the recovery process.
- the size of the microparticles was measured by laser granulometry in a liquid medium (Mastersizer 2000, Malvern, France). They have an average diameter of 6.4 ⁇ with a narrow distribution as indicated by the Span index equal to 1.5. (Fig. 23, Table 4). 10% of the particles have a diameter of less than 3.3 ⁇ and 90% of the particles have a diameter of less than 12.6 ⁇ .
- Table 4 Granulometric parameters of a MIL-100 / chitosan microparticle suspension. Mass ratio
- Microparticles were prepared from 5 mg of MIL-100 and 0.25 mg of chitosan. After purification, the microparticle pellet was dried at 100 ° C. for 18 h and then analyzed by elemental microanalysis (Table 5). As the nitrogen atom was found specifically in chitosan, it was possible to quantify its presence in the microparticles. The analysis showed that all chitosan was found to be associated with MIL 100.
- Table 5 Percentages of C, H and N determined by elemental microanalysis in the MIL-100, chitosan and MIL-100 / chitosan microparticle samples.
- Microparticles were prepared using rhodamine-isothiocyanate-labeled chitosan (chitosan-RITC) with a mass ratio MIL-100 / chitosan: 4/1; 8/1 and 20/1. After formation of the microparticles, Samples were centrifuged and washed with deionized water as previously described. The supernatants resulting from the centrifugation of the samples as well as the different washes were analyzed by spectrofluorimetry. It has been shown that they do not contain chitosan, the latter being fully associated with the MIL-100s to form the microparticles. This result confirms the results of elemental microanalysis.
- microparticles labeled with rhodaminelTC were resuspended in 1 mL of pH 7.4 phosphate buffer. After 24 h incubation at RT in this medium, the samples were centrifuged and the supernatants were analyzed by spectrofluorimetry. Chitosan-RITC was not detected in supernatants indicating that the MIL / chitosan combination was stable in the phosphate buffer.
- microparticles were dried at 100 ° C. for 18 h and then analyzed by FT-IR.
- the spectra obtained clearly show the presence of a characteristic absorption band of chitosan around 1030 cm -1 (elongation band of the COC ether bond) in the microparticle samples.
- Fig. 24
- MIL-100 and MIL-100 / chitosan materials were dried at 100 ° C. for 18 hours. Their structure was analyzed by X-ray diffraction (Siemens D5000 X'Pert High-Resolution Diffractometer MDP ( ⁇ -2 ⁇ ) ( ⁇ Cu, K 1, K 2) . The results showed the method of modifying the surface of the MIL 100 with chitosan does not alter the crystal structure of MIL-100 (Fig. 25) Encapsulation and release of AZT-TP Micrometric particles modified with chitosan were incubated with a solution of AZT-TP. After 24 hours of contact, the samples were centrifuged and the encapsulated AZT-TP was determined.
- MIL-100 / chitosan microparticles loaded with AZT-TP were also prepared from nanoparticles encapsulating AZT-TP (post-encapsulation modification). It has been shown that the modification process (post-encapsulation of AZT-TP) dislodges only 0.8% of the encapsulated PA by a dilution effect due to the recovery process.
- a PEG-alendronate-dextran bioconjugate was synthesized (Fig. 27) for surface modification of MOFs. This example concerns those based on iron trimesate (MIL-100).
- Dextran is a linear hydrophilic polysaccharide consisting of glucose units linked together by ⁇ - (1,6) bonds. This polymer has the advantage of being neutral, soluble in water, biocompatible and biodegradable. In addition, it is used for biomedical applications and gives the possibility of grafting different ligands of interest for targeting.
- Alendronate is a molecule used for the treatment of osteoporosis.
- the role of alendronate will be to ensure the inking and stability of the dextran-PEG overlay on the surface of the nanoMOF, by coordination with the iron.
- Ethyl acetate (AcOEt), dimethylformamide (DMF), dichloromethane (DCM), N-hydroxysuccinimide (NHS), 1-ethyl-3- (3'-dimethylaminopropyl) -N- (3-dimethylaminopropyl) -N'-ethylcarbodiimide hydrochloride (EDC), polyethylene glycol (PEG), 4-dimethylaminopyridine (DMAP), tetrahydrofuran (THF), 1,1-carbonyldiimidazole (DCI), molecular weight (MW), size exclusion chromatography (according to English) Size Exclusion Chromatography, SEC).
- AcOEt dimethylformamide
- DCM dichloromethane
- NHS N-hydroxysuccinimide
- EDC 1-ethyl-3- (3'-dimethylaminopropyl) -N- (3-dimethylaminopropyl) -N'-e
- Azido-alendronate was synthesized through a three-step synthetic procedure using 6-bromohexanoic acid as starting material.
- 6-azidohexanoic acid was synthesized on the basis of previously published methods, optimizing the described procedures. 1,2 Concretely, 6-bromohexanoic acid (MW 195.05 g / mol, 1.5 g, 7.7 mmol, 1 equiv) was dissolved in anhydrous DMF (10 mL). Then NaN 3 (MW 65.01, 1 g, 15.4 mmol, 2 equiv) was added. This mixture was heated at 85 ° C. with stirring and under N 2 for 24 hours. At the end of the reaction, the DMF was evaporated under vacuum. The resulting solid was dissolved in water (20 mL) and extracted with AcOEt (30 mL x3). The organic phase was dried with MgSO 4 , filtered and concentrated under vacuum to give 6-azidohexanoic acid as a slightly yellow oil
- 6-Azidohexanoate 2,5-dioxopyrrolidin-1-yl-6-azidohexanoate was synthesized on the basis of previously published methods, optimizing the procedure.
- 6-azidohexanoic acid MW 157 g / mol, 0.6 g, 3.82 mmol, 1 equiv
- NHS NHS
- EDC EDC
- alendronate sodium (MW 271.08, 0.445 g, 1.64 mmol, 1 equiv) was dissolved in deionized water (10 mL).
- an aqueous solution of NaOH (0.1 M, ⁇ 20 mL) was added dropwise to a pH of ⁇ 8.5.
- 2,5-dioxopyrrolidin-1-yl-6-azidohexanoate (0.514 g, 2 mmol, 1.2 equiv) was dissolved in acetonitrile (10 mL) and added to the aqueous solution in 4 portions. every 15 min.
- MePEG 43 Ms methoxy poly (ethylene glycol) methanesulfonate
- Solubilization of dextran A solution of the mixture containing dry dextran T40 and LiCl in DMF (10 mL) was heated at 80 ° C. under a nitrogen atmosphere and with stirring until complete dissolution of dextran T40.
- a "click” reaction was used as a synthesis method. Specifically, the copper-catalyzed cycloaddition reaction of azides and alkynes (I) was employed. 5 ' 9 ' 10
- the PEG-dextran bioconjugate (SEC PM (g / mol): 62,120 ( ⁇ 2.3%)) and azido-alendronate were mixed under a nitrogen atmosphere. Then, an aqueous solution (5 mL) containing CuSO 4 (5H 2 O) (MW 249.69, 0.017 g, 0.067 mmol, 10 equiv) previously purged with nitrogen was added. The resulting solution was placed at room temperature with stirring and N 2 for 5 min. Then, an aqueous solution of sodium ascorbate (PM 198.1, 0.016 g, 0.08 mmol, 12 equiv) (5 mL) was added. Then, the mixture was stirred under nitrogen at room temperature for 24 hours. At the end of the reaction, the solution was subjected to dialysis for 48 hours (membranes with a cutoff of 12000-14000 g / mol). Then, the dialyzed product was recovered and lyophilized.
- Example 16 Surface modification of nanoparticles of MIL-100 with poly-pCDP:
- the results obtained indicate that the amount of ⁇ -rhodamine associated with MIL-100s is 34 ( ⁇ 0.5)% w / w.
- the modified nanoparticles were washed with 1 ml of water in order to remove the excess of poly-pCDP-rhodamine and finally incubated in 1 ml of PBS (Phosphate Buffered Saline, Lonza) at 37 ° C., with stirring at room temperature. concentration of 2 mg / ml. After various incubation times (0.3-6-24 h) the suspension was centrifuged for 10 min at 9500 g, 500 L of the supernatant was removed and replaced with the same amount of fresh medium.
- PBS Phosphate Buffered Saline, Lonza
- the modified nanoparticles were washed with 1 ml of water in order to remove the excess of pCDP-rhodamine and finally incubated in 1 ml of PBS (Phosphate Buffered Saline, Lonza) at 37 ° C., with stirring. After various incubation times (0.3, 6.24h) the suspension was centrifuged for 10 min at 9491xg, 500 L of the supernatant was removed and replaced with the same amount of fresh medium. The supernatants were analyzed by spectrofluorimetry in order to quantify the release of pCDP-rhodamine into the medium.
- PBS Phosphate Buffered Saline, Lonza
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CA2873379A CA2873379C (fr) | 2012-05-31 | 2013-05-30 | Solide de reseau metal-organique (mof) cristallin poreux, a surface externe modifiee et son procede de preparation |
KR1020147036044A KR101993297B1 (ko) | 2012-05-31 | 2013-05-30 | 변형된 외부 표면을 가진 개선된 유기-무기 하이브리드 고체 |
CN201380033944.2A CN104718214B (zh) | 2012-05-31 | 2013-05-30 | 具有改性外表面的改善的有机‑无机杂化固体 |
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EP2855490B1 (fr) | 2018-03-07 |
FR2991325B1 (fr) | 2015-01-16 |
US20150150981A1 (en) | 2015-06-04 |
CA2873379A1 (fr) | 2013-12-05 |
JP6185571B2 (ja) | 2017-08-23 |
KR101993297B1 (ko) | 2019-06-26 |
FR2991325A1 (fr) | 2013-12-06 |
EP2855490A1 (fr) | 2015-04-08 |
CA2873379C (fr) | 2023-01-17 |
CN104718214B (zh) | 2017-12-29 |
IN2014DN10222A (fr) | 2015-08-07 |
CN104718214A (zh) | 2015-06-17 |
KR20150031243A (ko) | 2015-03-23 |
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US10159738B2 (en) | 2018-12-25 |
JP2015521197A (ja) | 2015-07-27 |
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