WO2010038747A1 - 親水性材料、医用材料および薬剤徐放材料 - Google Patents
親水性材料、医用材料および薬剤徐放材料 Download PDFInfo
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- WO2010038747A1 WO2010038747A1 PCT/JP2009/066966 JP2009066966W WO2010038747A1 WO 2010038747 A1 WO2010038747 A1 WO 2010038747A1 JP 2009066966 W JP2009066966 W JP 2009066966W WO 2010038747 A1 WO2010038747 A1 WO 2010038747A1
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- Prior art keywords
- hydrophilic
- polymer
- hydrophilic material
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- monomer
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- 238000013268 sustained release Methods 0.000 title claims abstract description 20
- 239000012730 sustained-release form Substances 0.000 title claims abstract description 20
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Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
- C08G63/91—Polymers modified by chemical after-treatment
- C08G63/912—Polymers modified by chemical after-treatment derived from hydroxycarboxylic acids
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K9/00—Medicinal preparations characterised by special physical form
- A61K9/48—Preparations in capsules, e.g. of gelatin, of chocolate
- A61K9/50—Microcapsules having a gas, liquid or semi-solid filling; Solid microparticles or pellets surrounded by a distinct coating layer, e.g. coated microspheres, coated drug crystals
- A61K9/51—Nanocapsules; Nanoparticles
- A61K9/5107—Excipients; Inactive ingredients
- A61K9/513—Organic macromolecular compounds; Dendrimers
- A61K9/5146—Organic macromolecular compounds; Dendrimers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polyethylene glycol, polyamines, polyanhydrides
- A61K9/5153—Polyesters, e.g. poly(lactide-co-glycolide)
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
- C08G63/66—Polyesters containing oxygen in the form of ether groups
- C08G63/664—Polyesters containing oxygen in the form of ether groups derived from hydroxy carboxylic acids
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
Definitions
- the present invention relates to a hydrophilic material, a medical material and a drug sustained-release material.
- Plastic which has developed with the progress of chemistry, has been used as an indispensable material in various fields as an alternative high-performance material for metals.
- Plastic has established a solid position as an industrial material, starting with daily necessities, and has expanded its use from nuclear power to space and ocean development. Such plastics have excellent properties and possibilities not found in other materials, and are lightweight, easy to mold, can be manufactured in complex shapes with a small number of steps, and are resistant to corrosion. It has features such as excellent chemical resistance.
- heat resistance was poor compared to metals, but since the 1960s, the design and development of new polymer materials with heat resistance has been in full swing, and polymer materials with high strength and high elasticity have been developed. It was.
- Such a polymer material is called an engineering plastic, and generally refers to a material having a thermal deformation temperature of 100 ° C. or higher, a tensile strength of 60 MPa or higher, and an elastic modulus of 2 GPa or higher.
- DHCA 3,4-dihydroxycinnamic acid
- acetic anhydride as a transesterification agent
- sodium acetate as a catalyst
- Non-Patent Document 1 As the DHCA composition ratio increased, the liquid crystallinity temperature decreased to 150 ° C., while the weight loss temperature exceeded 300 ° C. As a result, the liquid crystal temperature range was widened and the copolymer was easy to handle.
- the present inventor further succeeded in increasing the molecular weight of the DHCA-4HCA copolymer, which greatly affects the strength and elastic modulus. That is, as a result of the compression test of the DHCA-4HCA copolymer, the strength and elastic modulus differ depending on the composition ratio of the copolymer. The breaking strength and Young's modulus are shown. (Patent Document 1)
- a hydrophilic block copolymer or a graft copolymer forms micelles by self-organization in water.
- the micelles thus self-assembled are known to have a hydrophobic core on the inside and a hydrophilic group on the outside.
- a biocompatible micelle-forming copolymer encapsulates a drug in a hydrophobic core and improves dispersibility in blood by the action of an outer hydrophilic group. Yes. And when such a drug sustained-release material is made into nanoparticles, it is considered that it has a great potential in terms of its ability to move into blood.
- Biocompatibility refers to characteristics such as suppression of non-specific adsorption of biological substances such as proteins, no cytotoxicity, antigenicity, and inflammation, and stability in blood and body fluids.
- nanoparticles are sensitive to external factors such as temperature, pH, electromagnetic field, and light, but nanoparticles with unsaturated bonds have material properties suitable for each application due to their photoreactivity. It is drawing attention as something that can be easily and quickly controlled. For example, since it is known that 4HCA having an unsaturated bond and its derivative are crosslinked by ultraviolet rays, various studies including application of poly-4HCA and 4HCA copolymer have been made.
- the present inventor has succeeded in producing nanoparticles by self-assembling poly-4HCA and DHCA homopolymer in a solvent.
- the nanoparticles were shown to be photoreactive, hydrolyzed under alkaline conditions, and even interesting particle size changes.
- the nanoparticles of DHCA-4HCA copolymer cannot be dispersed in an aqueous solution due to high hydrophobicity, the problem that they cannot be applied to medical materials such as drug delivery systems is still being solved. Absent.
- the problem to be solved by the present invention is hydrophilicity, biocompatibility, hydrophilicity in which a hydrophilic monomer or a hydrophilic polymer is bonded to a polymer containing an aromatic compound that can be a nanoparticle. More specifically, the present invention provides a hydrophilic material having a nano particle size that is excellent in dispersibility in water and excellent in migration into blood and that is useful as a drug carrier for drug delivery and the like. is there.
- a hydrophilic monomer at the ⁇ -position of the ⁇ , ⁇ -unsaturated carboxyl group of a polymer containing an ⁇ , ⁇ -unsaturated carboxyl group on the aromatic ring and an aromatic compound substituted with one or more hydroxyl groups A hydrophilic material, wherein a body or a hydrophilic polymer is bonded.
- the aromatic compound is 2-hydroxycinnamic acid, 3-hydroxy cinnamic acid, 4-hydroxy cinnamic acid, 4-hydroxy-2-methoxy cinnamic acid, 4-hydroxy-3-methoxy cinnamic acid and 3,4-
- the hydrophilic material according to (1) which is a derivative of at least one cinnamic acid selected from the group consisting of dihydroxycinnamic acid.
- hydrophilic material as described in (1), wherein the binding ratio of the hydrophilic monomer or hydrophilic polymer to the polymer containing the aromatic compound is 1 to 100%.
- the hydrophilic monomer is selected from the group consisting of alcohol, alkylene ether, a monomer having a sulfone group, a monomer having a carboxyl group, a monomer having an amino group, and a monomer having a cyano group.
- the hydrophilic material according to (1) which is at least one selected monomer and has at least one functional group bonded to the ⁇ -position of the ⁇ , ⁇ -unsaturated carboxyl group.
- hydrophilic material according to (6), wherein the alcohol is at least one polyhydric alcohol selected from the group consisting of ethylene glycol, trimethylene glycol, glycerin, pentaerythritol and threitol.
- the hydrophilic polymer is a polymer or copolymer of polyhydric alcohol, a polymer or copolymer of acrylic acid, a polymer or copolymer of methacrylic acid, and a polymer or copolymer of vinyl alcohol. At least one polymer selected from the group consisting of at least one functional group bonded to the ⁇ -position of the ⁇ , ⁇ -unsaturated carboxyl group, material.
- the polyhydric alcohol polymer is at least one polyalkylene glycol selected from the group consisting of polyethylene glycol, polypropylene glycol, and polyethylene / propylene glycol, and has at least a group that reacts with a polymer containing an aromatic compound.
- the hydrophilic material as described in (8) which has one.
- hydrophilic monomer or the hydrophilic polymer is bonded to the ⁇ -position of the ⁇ , ⁇ -unsaturated carboxyl group via a sulfur atom or an oxygen atom. Hydrophilic material.
- a medical material comprising the hydrophilic material according to any one of (1) to (12).
- a drug sustained-release material characterized by using the hydrophilic material according to any one of (1) to (12).
- the hydrophilic material of the present invention is a novel compound. Since the hydrophilic material of the present invention is hydrophilic, biocompatible, and can be a nanoparticle, it has good water dispersibility, excellent migration to blood, and is useful as a drug carrier such as drug delivery. is there.
- A BSA sustained release time and Graph showing the relationship of sustained release
- B Schematic showing the change in particle size due to the difference in pH BSA sustained release behavior before and after cross-linking of hydrophilic material (PCA-DTT-11) particles in which threitol is bound to 3,4-dihydroxycinnamic acid-4-hydroxycinnamic acid copolymer;
- B Schematic showing the change in particle size due to crosslinking
- the hydrophilic material of the present invention includes a polymer (including a copolymer; including a copolymer; hereinafter, an ⁇ , ⁇ -unsaturated carboxyl group on an aromatic ring and an aromatic compound substituted with one or more hydroxyl groups.
- a hydrophilic monomer or hydrophilic polymer (including a copolymer) having a functional group capable of binding to the ⁇ -position of an ⁇ , ⁇ -unsaturated carboxyl group of an aromatic compound. Simply referred to as a hydrophilic polymer).
- the polymer containing the aromatic compound of the skeleton of the hydrophilic material of the present invention is not particularly limited, but from the point of biocompatibility, it is a polycondensation of an ⁇ , ⁇ -unsaturated carboxyl group substituted with an aromatic ring and a hydroxyl group.
- the obtained aromatic polyester is preferable, and an aromatic polyester copolymer composed of two aromatic compounds is more preferable.
- the degree of polymerization of the polymer containing the aromatic compound of the skeleton is not particularly limited, but in any case of a homopolymer, a random copolymer, and a block copolymer, 10 to 10,000, preferably 50 to 8,000, More preferably, it is 100 to 6,000.
- the molar ratio of each aromatic compound in the copolymer is not particularly limited. As the degree of polymerization of the polymer containing the aromatic compound of the skeleton increases, the particle size of the hydrophilic material tends to increase and the particle size distribution tends to be narrowed, making it easier to use as a drug sustained-release material.
- the aromatic compound is not particularly limited as long as it is an aromatic compound in which an aromatic ring is substituted with an ⁇ , ⁇ -unsaturated carboxyl group and one or more hydroxyl groups, but a cinnamic acid or arocinnamic acid derivative is preferable.
- Cinnamic acid derivatives include 2-hydroxycinnamic acid, 3-hydroxy cinnamic acid, 4-hydroxy cinnamic acid (4HCA), 4-hydroxy 2-methoxy cinnamic acid, 4-hydroxy 3-methoxy cinnamic acid, 3,4- Examples include dihydroxycinnamic acid (DHCA).
- 4HCA 2-hydroxycinnamic acid
- DHCA dihydroxycinnamic acid
- Preferred are 4HCA, DHCA, etc., and particularly preferred is a combination of 4HCA and DHCA.
- the polymer containing the aromatic compound is, for example, 4HCA and DHCA, heated using a catalyst under acetic anhydride and sodium acetate as a transesterification agent in a nitrogen atmosphere, while being shielded from light, and subjected to condensation polymerization to form a DHCA-4HCA copolymer.
- a catalyst under acetic anhydride and sodium acetate as a transesterification agent in a nitrogen atmosphere while being shielded from light, and subjected to condensation polymerization to form a DHCA-4HCA copolymer.
- a hydrophilic monomer or hydrophilic polymer that binds to a polymer containing an aromatic compound must have a functional group capable of binding to the ⁇ -position of the ⁇ , ⁇ -unsaturated carboxyl group of the polymer containing the aromatic compound.
- it preferably has a mercapto group, a hydroxyl group and the like, and particularly preferably has a mercapto group, because of its good binding property to the ⁇ -position.
- the hydrophilic monomer is an alcohol, an alkylene ether, a monomer having a sulfone group, a monomer having a carboxyl group, a monomer having an amino group, a monomer having a cyano group, or a monomer having a mercapto group Is not particularly limited as long as it has at least one functional group capable of binding to the ⁇ -position of the ⁇ , ⁇ -unsaturated carboxyl group of the polymer containing the aromatic compound, but is biocompatible. From the viewpoint of reactivity, a thiolated product of a terminal hydroxyl group of alcohol is preferable. Two or more hydrophilic monomers may be used in combination.
- the alcohol is preferably a polyhydric alcohol, and low molecular weight polyhydric alcohols such as ethylene glycol, trimethylene glycol, glycerin, pentaerythritol, and threitol are exemplified. Moreover, the thiolation product of the terminal hydroxyl group of polyhydric alcohols, such as dithiothreitol, can also be used. Two or more polyhydric alcohols may be used in combination.
- the hydrophilic polymer is a polymer such as a polymer or copolymer of polyhydric alcohol, a polymer or copolymer of acrylic acid, a polymer or copolymer of methacrylic acid, a polymer or copolymer of vinyl alcohol, etc. However, it is not particularly limited as long as it has at least one functional group that can be bonded to the ⁇ -position of the ⁇ , ⁇ -unsaturated carboxyl group of the polymer containing the aromatic compound, but is not limited in terms of biocompatibility.
- a polymer of a monohydric alcohol is particularly preferred.
- the polymer by which the terminal hydroxyl group of the polyhydric alcohol is thiolated from the reactive point is preferable. Two or more hydrophilic polymers may be used in combination.
- polyhydric alcohol polymer examples include polyalkylene glycols such as polyethylene glycol, polypropylene glycol, and polyethylene / propylene glycol. Two or more polyhydric alcohols may be used in combination.
- the functional group at the other end of the hydrophilic polymer is preferably masked with a methyl group or the like.
- the degree of polymerization of the hydrophilic polymer is 2 to 20,000, more preferably 3 to 15,000, and still more preferably 4 to 10,000.
- the larger the degree of polymerization of the hydrophilic polymer the larger the particle size of the hydrophilic material, the narrower the particle size distribution, and the better the water dispersibility. Therefore, when using as a medical material, the thing with a larger polymerization degree of a hydrophilic polymer is preferable.
- the hydrophilic material is obtained by, for example, polymerizing an aromatic compound with a terminal thiolated product of threitol such as dithiothreitol, which is a hydrophilic monomer, in the presence of an amine catalyst. It can be manufactured by heating.
- a terminal thiolated product of polyethylene glycol which is a hydrophilic polymer, can be produced by heating a polymer containing an aromatic compound in the presence of an amine catalyst.
- a hydrophilic material having a high combined binding rate tends to increase the particle size of the hydrophilic material, narrow the particle size distribution, improve water dispersibility, and improve usability. Therefore, when used as a medical material, a hydrophilic material having a high binding ratio of the hydrophilic monomer or hydrophilic polymer is more preferable.
- m is 10 to 10,000
- n is 10 to 10,000
- p is 2 to 20,000
- m is preferably 50 to 8,000, more preferably 100 to 6,000.
- n is preferably 50 to 8,000, more preferably 100 to 6,000.
- p is preferably 3 to 15,000, and more preferably 4 to 10,000.
- the hydrophilic material represented by the formula (1) varies depending on the application, but usually has a number average molecular weight (Mn) of 1,000 to 1,000,000, preferably 1,100 to 100,000.
- Mn number average molecular weight
- the molecular weight distribution, that is, the ratio (Mw / Mn) of the weight average molecular weight (Mw) to the number average molecular weight is preferably 1.01 to 10.00, and more preferably 1.01 to 7.00.
- hydrophilic material of the present invention structural formula (2) of a hydrophilic material in which threitol is bonded to a DHCA-4HCA copolymer (PCA) and further crosslinked is shown.
- n 10 to 10,000, but m and n are preferably 50 to 8,000, and more preferably 100 to 6,000.
- the hydrophilic material represented by the structural formula (2) varies depending on the application, but usually Mn is 1,000 to 1,000,000, preferably 1,100 to 100,000, and Mw / Mn Is 1.01 to 10.00, preferably 1.01 to 7.00.
- the particle shape of the hydrophilic material of the present invention is not limited, but is preferably spherical.
- the particle size of the hydrophilic material of the present invention is 10 to 20,000 nm, preferably 15 to 10,000 nm, more preferably 20 to 1,000 nm.
- the particle size of the hydrophilic material varies depending on the degree of polymerization of the polymer containing the aromatic compound, the amount of the hydrophilic monomer or hydrophilic polymer bound, the degree of polymerization of the hydrophilic polymer, etc. The higher the degree of polymerization of the hydrophilic material and the larger Mn, the smaller Mw / Mn. That is, the particle size distribution becomes narrow.
- the hydrophilic material of the present invention has biocompatibility. Specifically, the biocompatibility is determined by seeding fibroblasts on the surface of the hydrophilic material and measuring the number of cell adhesion, and as a result, most cells adhere. Say if you did not.
- the hydrophilic material of the present invention is excellent in mechanical strength, flexibility, photoreactivity, hydrophilicity, biocompatibility, and can be easily formed into particles, so that it can be used in various applications as a hydrophilic material.
- it is preferable as a medical material, and can be particularly preferably used as a drug sustained-release material.
- Example 1 3,4-Dihydroxycinnamic acid (DHCA) -4-Hydroxycinnamic acid (4HCA) copolymer (PCA) hydrophilic material (PCA-DTT) bonded with threitol
- DHCA 3,4-Dihydroxycinnamic acid
- PCA copolymer
- PCA-DTT hydrophilic material
- PCA DHCA-4HCA copolymer
- the molar ratio was calculated from the 1 H NMR absorption spectrum obtained using a nuclear magnetic resonance apparatus (manufactured by Varian, UNITY400Plus).
- the bond rate of DTT was calculated by a 1 H NMR absorption spectrum (FIG. 1) obtained using a nuclear magnetic resonance apparatus (UNITY400Plus, manufactured by Varian) and a UV-VIS spectrophotometer. Table 1 shows the bonding rate (mol%) of DTT.
- each PCA-DTT (6 samples) was dissolved in dimethyl sulfoxide (DMSO) and dialyzed in water for 4 days to prepare PCA-DTT particles (6 samples).
- the particle size and dispersity (standard deviation / average particle size) of each PCA-DTT particle were determined by a dynamic light scattering method using a dynamic light scattering device (Zeta-sizer Nano ZS, manufactured by Malvern). The results are shown in Table 1. All were confirmed to be nanoparticles.
- Each PCA-DTT particle (6 samples) was plotted on a graph with the particle size on the horizontal axis and the light scattering intensity on the vertical axis (FIG. 2).
- a TEM image (FIG. 3) and an SEM image (FIG. 4) of each PCA-DTT particle (6 samples) are shown. 3 and 4, (1) to (6) correspond to numbers (1) to (6) in Table 1, and indicate PCA-DTT-4 to PCA-DTT-98.
- DTT is bound to the ⁇ -position of the ⁇ , ⁇ -unsaturated carboxyl group of PCA by more than 36%, more than 56%, 78%, and 98%. That is, it is understood that the higher the DTT binding rate, the larger the particle size, the monodispersed and narrow particle size distribution (dispersion degree), and the better the water dispersibility (hydrophilicity).
- each PCA-DTT particle was irradiated with UV, and the degree of decrease in absorption intensity derived from unsaturated bonds was investigated with a UV-VIS spectrophotometer (FIG. 5).
- the addition reaction shown in FIG. 5-A occurred by UV irradiation, and the spectrum changed as shown in FIG. 5-B.
- the irradiation time increases, the absorption intensity around 320 to 330 nm derived from the C ⁇ C bond decreases (FIG. 5-C), and as the DTT content increases, the PCA-DTT particles Photoreactivity decreased (FIG. 5-D).
- the particle size of the PCA-DTT particles became smaller with time (FIG. 6-A), and the particle size of the PCA-DTT particles became smaller (FIG. 6-B). .
- FITC-BSA fluorescein isothiocyanate
- PBS phosphate buffered saline
- the amount of BSA supported on the particles was measured from the fluorescence intensity of the supported FITC-BSA using a fluorescence spectrum device (PerkinElmer, Wallac 1420 ARVO).
- the particle size of the BSA-encapsulated particles was evaluated by a dynamic scattering method and SEM observation. As a result, the DTT binding rate increased and the amount of BSA supported increased (FIG. 7). In addition, as the bonding rate of DTT increases, the particle size increases (FIG. 8-A). In the SEM images of the particles before and after the loading of BSA, the particles that appear to contain BSA in the particles after loading. An increase in diameter was observed (FIGS. 8-B and C).
- This poly-4HCA was dissolved in DMSO, dialyzed in water for 4 days, and subjected to a dynamic light scattering method using a dynamic light scattering apparatus (Zeta-sizer Nano ZS, manufactured by Malvern). An attempt was made to determine the degree of dispersion, but it did not dissolve in DMSO and could not be dialyzed.
- the polyDHCA was dissolved in DMSO, dialyzed in water for 4 days, and subjected to a dynamic light scattering method using a dynamic light scattering apparatus (Zeta-sizer Nano Zs, manufactured by Malvern). An attempt was made to determine the degree of dispersion, but it did not dissolve in DMSO and could not be dialyzed.
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Abstract
Description
本発明の親水性材料は親水性で、生体適合性があり、ナノ粒子となり得るので、水への分散性が良く、血中への移行性が優れ、ドラッグデリバリーなどの薬物担持体として有用である。
骨格の芳香族化合物を含む重合体の重合度は特に限定されないが、ホモ重合体、ランダム共重合体、ブロック共重合体のいずれの場合も10~10,000、好ましくは50~8,000、より好ましくは100~6,000である。共重合体の各芳香族化合物のモル比は特に限定されない。
骨格の芳香族化合物を含む重合体の重合度が大きいほど、親水性材料の粒径が大きくなり、粒径分布が狭くなる傾向があり、薬剤徐放材料として使い勝手がよくなる。
本発明の親水性材料の粒径は10~20,000nm、好ましくは15~10,000nm、より好ましくは20~1,000nmである。親水性材料の粒径は、芳香族化合物を含む重合体の重合度、親水性単量体または親水性重合体の結合量、親水性重合体の重合度等により変化することは言うまでもないが、親水性材料の重合度が大きく、Mnが大きいほど、Mw/Mnが小さくなる。すなわち、粒径分布が狭くなる。
3,4-ジヒドロキシ桂皮酸(DHCA)-4-ヒドロキシ桂皮酸(4HCA)共重合体(PCA)にトレイトールを結合させた親水性材料(PCA-DTT)
3,4-ジヒドロキシ桂皮酸(DHCA、カフェ酸)5.40gと4-ヒドロキシ桂皮酸(4HCA)4.90gと触媒である酢酸ナトリウム0.05gとエステル交換剤である無水酢酸50mLを三口フラスコに入れて、10分間窒素バブリングし、窒素気流下で200℃のオイルバスに6時間入れて縮重合させた。
得られた析出物をジメチルホルムアミドに溶解し、メタノール中で再沈殿させた。吸引ろ過後、室温で1昼夜真空乾燥し、Mw=25,000で、DHCAと4HCAのモル比が1:1であるDHCA-4HCA共重合体(PCA)を得た。モル比は核磁気共鳴装置(バリアン社製、UNITY400Plus)を用いて得た1H NMR吸収スペクトルから算出した。
なお、図1-Bの各PCA-DTTの吸収ピーク(a,c,c1,d1,b,j,k,f,e,g,h)に対応する化合物の原子、原子団を図1-Aに示した。
また、表1中、「原料」は4HCAとチオール基の合計モル比に対するDTTの供給モル比、「1H NMRから」は1H NMR吸収スペクトルからのDTT結合率の計算値、「UV-VISから」はUV-VISスペクトルからのDTT結合率の計算値である。
また、各PCA-DTTの表面に繊維芽細胞を播種したが、殆ど接着しなかったことから、生体適合性が確認された。
動的光散乱装置(マルバーン社製、Zeta-sizer Nano ZS)を用いた動的光散乱法によって、各PCA-DTT粒子の粒径および分散度(標準偏差/平均粒径)を求めた。結果を表1に示した。いずれもがナノ粒子であることが確認された。粒径を横軸に、光散乱強度を縦軸にしたグラフに各PCA-DTT粒子(6試料)をプロットした(図2)。
また、各PCA-DTT粒子(6試料)のTEM画像(図3)とSEM画像(図4)を示した。なお、図3、図4における(1)~(6)は表1の番号(1)~(6)に対応し、PCA-DTT-4~PCA-DTT-98を指す。
また、UV照射を行った際、PCA-DTT粒子の粒径は経時的に小さくなり(図6-A)、PCA-DTT粒子の粒径がコンパクトになることが分かった(図6-B)。
その結果、DTTの結合率が増大するとともに、BSAの担持量は増加した(図7)。また、DTTの結合率が増大するとともに、粒径が増大し(図8-A)、BSAの担持前と担持後の粒子のSEM画像では、担持後の粒子にBSAが内包されたと思われる粒径の拡大が認められた(図8-B、C)。
その結果、酸性側の緩衝液中では、150時間後もほとんど、BSAが徐放されなかったのに対し、緩衝液が中性~アルカリ性になるに従って、粒子が崩壊して、BSAの徐放量が増加した(図9-A,B)。
また、pH=7.4と生体内に近い緩衝液中では、光架橋したPCA-DTT粒子の徐放速度の方が速く(図10-A)、光架橋による徐放速度の制御も可能であることが分かった。これは架橋により分子同士が反応して粒径がコンパクトになることに起因すると思われる(図10-B)。
4-ヒドロキシ桂皮酸ホモポリマー(ポリ4HCA)
4-ヒドロキシ桂皮酸(4HCA)9.85gと触媒である酢酸ナトリウム0.05gとエステル交換剤である無水酢酸50mLを三口フラスコに入れて10分間窒素バブリングし、窒素気流下で200℃のオイルバスに6時間撹拌させながら縮重合した。得られた析出物を100mlのジメチルホルムアミドに溶解し、1Lのメタノール中で再沈殿させた。これを吸引ろ過した後、室温で二昼夜真空乾燥させ、ポリ4HCAを得た。
このポリ4HCAをDMSOに溶解し、4日間水中で透析を行って動的光散乱装置(マルバーン社製、Zeta-sizer Nano ZS)を用いた動的光散乱法により、該ポリ4HCAの粒径および分散度を求めようとしたが、DMSOに溶解せず、透析を行うことができなかった。
3,4-ジヒドロキシ桂皮酸ホモポリマー(ポリDHCA)
3,4-ジヒドロキシ桂皮酸(DHCA)10.93gと触媒である酢酸ナトリウム0.05gとエステル交換剤である無水酢酸50mLを三口フラスコに入れて10分間窒素バブリングさせ、窒素気流下で200℃のオイルバスに6時間撹拌させながら縮重合した。得られた析出物を100mlのジメチルホルムアミドに溶解し、1Lのメタノール中で再沈殿させた。これを吸引ろ過した後、室温で2昼夜真空乾燥させ、ポリDHCAを得た。
このポリDHCAをDMSOに溶解させ、4日間水中で透析を行って動的光散乱装置(マルバーン社製、Zeta-sizer Nano Zs)を用いた動的光散乱法により、該ポリDHCAの粒径および分散度を求めようとしたが、DMSOに溶解せず、透析を行うことができなかった。
(1)PCA-DTT-4
(2)PCA-DTT-11
(3)PCA-DTT-36
(4)PCA-DTT-56
(5)PCA-DTT-78
(6)PCA-DTT-98
Claims (14)
- 芳香環にα,β-不飽和カルボキシル基、および、1以上の水酸基が置換した芳香族化合物を含む重合体の前記α,β-不飽和カルボキシル基のβ位に、親水性単量体または親水性重合体が結合されていることを特徴とする親水性材料。
- 芳香族化合物が、2-ヒドロキシ桂皮酸、3-ヒドロキシ桂皮酸、4-ヒドロキシ桂皮酸、4-ヒドロキシ-2-メトキシ桂皮酸、4-ヒドロキシ-3-メトキシ桂皮酸および3,4-ジヒドロキシ桂皮酸からなる群から選ばれた少なくとも一種の桂皮酸の誘導体であることを特徴とする請求項1に記載の親水性材料。
- 芳香族化合物を含む重合体が、4-ヒドロキシ桂皮酸と3,4-ジヒドロキシ桂皮酸を含むポリエステル共重合体であることを特徴とする請求項1に記載の親水性材料。
- 芳香族化合物を含む重合体の重合度が10~10,000であることを特徴とする請求項1に記載の親水性材料。
- 芳香族化合物を含む重合体に対する親水性単量体または親水性重合体の結合率が1~100%であることを特徴とする請求項1に記載の親水性材料。
- 親水性単量体が、アルコール、アルキレンエーテル、スルホン基を有する単量体、カルボキシル基を有する単量体、アミノ基を有する単量体およびシアノ基を有する単量体からなる群から選ばれた少なくとも一種の単量体であって、前記α,β-不飽和カルボキシル基のβ位に結合する官能基を少なくとも一つ有することを特徴とする請求項1に記載の親水性材料。
- アルコールが、エチレングリコール、トリメチレングリコール、グリセリン、ペンタエリスリトールおよびトレイトールからなる群から選ばれた少なくとも一種の多価アルコールであることを特徴とする請求項6に記載の親水性材料。
- 親水性重合体が、多価アルコールの重合体または共重合体、アクリル酸の重合体または共重合体、メタクリル酸の重合体または共重合体およびビニルアルコールの重合体または共重合体からなる群から選ばれた少なくとも一種の重合体であって、前記α,β-不飽和カルボキシル基のβ位に結合する官能基を少なくとも一つ有することを特徴とする請求項1に記載の親水性材料。
- 多価アルコールの重合体が、ポリエチレングリコール、ポリプロピレングリコールおよびポリエチレン・プロピレングリコールからなる群から選ばれる少なくとも一種のポリアルキレングリコールであって、芳香族化合物を含む重合体と反応する基を少なくとも一つ有することを特徴とする請求項8に記載の親水性材料。
- 親水性重合体の重合度が10~20,000であることを特徴とする請求項8に記載の親水性材料。
- 親水性単量体または親水性重合体がイオウ原子または酸素原子を介して前記α,β-不飽和カルボキシル基のβ位に結合していることを特徴とする請求項1に記載の親水性材料。
- ナノ粒子であることを特徴とする請求項1に記載の親水性材料。
- 請求項1~12のいずれかに記載の親水性材料を用いたことを特徴とする医用材料。
- 請求項1~12のいずれかに記載の親水性材料を用いたことを特徴とする薬剤徐放材料。
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Citations (8)
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JPS5021804A (ja) * | 1973-06-29 | 1975-03-08 | ||
US4053415A (en) * | 1975-01-09 | 1977-10-11 | Fuji Photo Film Co., Ltd. | Unsaturated polyester ether having a photocrosslinkable moiety |
US4355136A (en) * | 1982-01-04 | 1982-10-19 | Eastman Kodak Company | Solvent-resistant unsaturated polyester compositions |
JPS60110722A (ja) * | 1983-11-21 | 1985-06-17 | Otsuka Chem Co Ltd | 新規ポリエステル及びその製造法 |
JPH1160928A (ja) * | 1997-08-27 | 1999-03-05 | Nishikawa Rubber Co Ltd | ポリヒドロキシカルボン酸樹脂組成物およびその製造方法 |
JP2004250700A (ja) | 2003-01-30 | 2004-09-09 | Mitsuru Akashi | バイオ液晶ポリマーおよび成形体 |
EP1873183A1 (en) * | 2006-06-30 | 2008-01-02 | DSMIP Assets B.V. | Branched polyester containing powder coating composition |
WO2009054113A1 (ja) * | 2007-10-25 | 2009-04-30 | Japan Advanced Institute Of Science And Technology | 硬質発泡体 |
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Publication number | Priority date | Publication date | Assignee | Title |
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US4874540A (en) * | 1986-07-18 | 1989-10-17 | Ecolab Inc. | Graft copolymers of a polyether moiety on a polycarboxylate backbone |
US6958212B1 (en) * | 1999-02-01 | 2005-10-25 | Eidgenossische Technische Hochschule Zurich | Conjugate addition reactions for the controlled delivery of pharmaceutically active compounds |
WO2001045758A1 (en) * | 1999-12-23 | 2001-06-28 | The Dow Chemical Company | High permeability, low absorption capacity polymers |
US7182884B2 (en) | 2003-01-30 | 2007-02-27 | Mitsuru Akashi | Bio-liquid crystal polymer and shaped material using same |
PL1979407T3 (pl) * | 2006-01-19 | 2015-03-31 | Allexcel Inc | Solubizacja i ukierunkowane dostarczanie leków samoorganizującymi się polimerami amfifilowymi |
-
2009
- 2009-09-29 WO PCT/JP2009/066966 patent/WO2010038747A1/ja active Application Filing
- 2009-09-29 EP EP09817779.3A patent/EP2336218B1/en not_active Not-in-force
- 2009-09-29 US US13/121,604 patent/US8835570B2/en not_active Expired - Fee Related
- 2009-09-29 JP JP2010531861A patent/JP5584624B2/ja active Active
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5021804A (ja) * | 1973-06-29 | 1975-03-08 | ||
US4053415A (en) * | 1975-01-09 | 1977-10-11 | Fuji Photo Film Co., Ltd. | Unsaturated polyester ether having a photocrosslinkable moiety |
US4355136A (en) * | 1982-01-04 | 1982-10-19 | Eastman Kodak Company | Solvent-resistant unsaturated polyester compositions |
JPS60110722A (ja) * | 1983-11-21 | 1985-06-17 | Otsuka Chem Co Ltd | 新規ポリエステル及びその製造法 |
JPH1160928A (ja) * | 1997-08-27 | 1999-03-05 | Nishikawa Rubber Co Ltd | ポリヒドロキシカルボン酸樹脂組成物およびその製造方法 |
JP2004250700A (ja) | 2003-01-30 | 2004-09-09 | Mitsuru Akashi | バイオ液晶ポリマーおよび成形体 |
EP1873183A1 (en) * | 2006-06-30 | 2008-01-02 | DSMIP Assets B.V. | Branched polyester containing powder coating composition |
WO2009054113A1 (ja) * | 2007-10-25 | 2009-04-30 | Japan Advanced Institute Of Science And Technology | 硬質発泡体 |
Non-Patent Citations (2)
Title |
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MITSURU AKASHI: "KOBUNSHI", vol. 55, 2006, THE ORGAN OF THE SOCIETY OF POLYMER SCIENCE, article "Kankyojunkan- gata Enjiniaringupurasuchikku", pages: 870 - 873 |
See also references of EP2336218A4 |
Also Published As
Publication number | Publication date |
---|---|
JPWO2010038747A1 (ja) | 2012-03-01 |
US8835570B2 (en) | 2014-09-16 |
EP2336218A4 (en) | 2013-10-09 |
JP5584624B2 (ja) | 2014-09-03 |
EP2336218B1 (en) | 2017-02-22 |
EP2336218A1 (en) | 2011-06-22 |
US20110257338A1 (en) | 2011-10-20 |
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