WO2012124219A1 - ポリロタキサン組成物 - Google Patents
ポリロタキサン組成物 Download PDFInfo
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- WO2012124219A1 WO2012124219A1 PCT/JP2011/078024 JP2011078024W WO2012124219A1 WO 2012124219 A1 WO2012124219 A1 WO 2012124219A1 JP 2011078024 W JP2011078024 W JP 2011078024W WO 2012124219 A1 WO2012124219 A1 WO 2012124219A1
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- polyrotaxane
- cyclodextrin
- peg
- composition
- antioxidant
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G65/00—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule
- C08G65/02—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring
- C08G65/04—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring from cyclic ethers only
- C08G65/06—Cyclic ethers having no atoms other than carbon and hydrogen outside the ring
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
- C08B37/00—Preparation of polysaccharides not provided for in groups C08B1/00 - C08B35/00; Derivatives thereof
- C08B37/0006—Homoglycans, i.e. polysaccharides having a main chain consisting of one single sugar, e.g. colominic acid
- C08B37/0009—Homoglycans, i.e. polysaccharides having a main chain consisting of one single sugar, e.g. colominic acid alpha-D-Glucans, e.g. polydextrose, alternan, glycogen; (alpha-1,4)(alpha-1,6)-D-Glucans; (alpha-1,3)(alpha-1,4)-D-Glucans, e.g. isolichenan or nigeran; (alpha-1,4)-D-Glucans; (alpha-1,3)-D-Glucans, e.g. pseudonigeran; Derivatives thereof
- C08B37/0012—Cyclodextrin [CD], e.g. cycle with 6 units (alpha), with 7 units (beta) and with 8 units (gamma), large-ring cyclodextrin or cycloamylose with 9 units or more; Derivatives thereof
- C08B37/0015—Inclusion compounds, i.e. host-guest compounds, e.g. polyrotaxanes
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
- C08B37/00—Preparation of polysaccharides not provided for in groups C08B1/00 - C08B35/00; Derivatives thereof
- C08B37/0006—Homoglycans, i.e. polysaccharides having a main chain consisting of one single sugar, e.g. colominic acid
- C08B37/0009—Homoglycans, i.e. polysaccharides having a main chain consisting of one single sugar, e.g. colominic acid alpha-D-Glucans, e.g. polydextrose, alternan, glycogen; (alpha-1,4)(alpha-1,6)-D-Glucans; (alpha-1,3)(alpha-1,4)-D-Glucans, e.g. isolichenan or nigeran; (alpha-1,4)-D-Glucans; (alpha-1,3)-D-Glucans, e.g. pseudonigeran; Derivatives thereof
- C08B37/0012—Cyclodextrin [CD], e.g. cycle with 6 units (alpha), with 7 units (beta) and with 8 units (gamma), large-ring cyclodextrin or cycloamylose with 9 units or more; Derivatives thereof
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- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G65/00—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule
- C08G65/02—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring
- C08G65/26—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring from cyclic ethers and other compounds
- C08G65/2603—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring from cyclic ethers and other compounds the other compounds containing oxygen
- C08G65/2606—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring from cyclic ethers and other compounds the other compounds containing oxygen containing hydroxyl groups
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G65/00—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule
- C08G65/02—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring
- C08G65/32—Polymers modified by chemical after-treatment
- C08G65/329—Polymers modified by chemical after-treatment with organic compounds
- C08G65/333—Polymers modified by chemical after-treatment with organic compounds containing nitrogen
- C08G65/33303—Polymers modified by chemical after-treatment with organic compounds containing nitrogen containing amino group
- C08G65/3331—Polymers modified by chemical after-treatment with organic compounds containing nitrogen containing amino group cyclic
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G65/00—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule
- C08G65/02—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring
- C08G65/32—Polymers modified by chemical after-treatment
- C08G65/329—Polymers modified by chemical after-treatment with organic compounds
- C08G65/333—Polymers modified by chemical after-treatment with organic compounds containing nitrogen
- C08G65/33396—Polymers modified by chemical after-treatment with organic compounds containing nitrogen having oxygen in addition to nitrogen
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G83/00—Macromolecular compounds not provided for in groups C08G2/00 - C08G81/00
- C08G83/007—Polyrotaxanes; Polycatenanes
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/0008—Organic ingredients according to more than one of the "one dot" groups of C08K5/01 - C08K5/59
- C08K5/005—Stabilisers against oxidation, heat, light, ozone
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/05—Alcohols; Metal alcoholates
- C08K5/053—Polyhydroxylic alcohols
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L5/00—Compositions of polysaccharides or of their derivatives not provided for in groups C08L1/00 or C08L3/00
- C08L5/16—Cyclodextrin; Derivatives thereof
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L71/00—Compositions of polyethers obtained by reactions forming an ether link in the main chain; Compositions of derivatives of such polymers
- C08L71/02—Polyalkylene oxides
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G2650/00—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule
- C08G2650/02—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule characterized by the type of post-polymerisation functionalisation
- C08G2650/04—End-capping
Definitions
- the present invention relates to a polyrotaxane composition.
- ringing gel has been proposed as a new type of gel that is not classified as either a physical gel or a chemical gel, and a crosslinked polyrotaxane has attracted attention as a compound used in such a ringing gel.
- the crosslinked polyrotaxane can be obtained by crosslinking a plurality of polyrotaxanes having blocking groups introduced at both ends of the pseudopolyrotaxane.
- the pseudopolyrotaxane comprises a polyethylene glycol having a reactive group at both ends (hereinafter also referred to as “PEG”) and a cyclodextrin that includes the PEG
- the resulting cross-linked polyrotaxane is obtained on a linear molecule of PEG. Since the cyclodextrin penetrated like a skewer is movable along the straight chain molecule (pulley effect), even if tension is applied, the tension can be uniformly dispersed by the pulley effect. Therefore, the cross-linked polyrotaxane has excellent properties that are not found in conventional cross-linked polymers, such as being less prone to cracks and scratches.
- the polyrotaxane used for the production of the crosslinked polyrotaxane usually contains free cyclodextrin (hereinafter also referred to as “free cyclodextrin”), and this free cyclodextrin reduces the properties of the crosslinked polyrotaxane. It is necessary to remove the free cyclodextrin by purification by a method or the like.
- Patent Document 1 carboxylated polyethylene glycol and cyclodextrin molecules are mixed, and both ends of the pseudopolyrotaxane formed by the inclusion of the carboxylated polyethylene glycol in a skewered manner in the openings of the cyclodextrin molecules are blocked by blocking groups.
- a method for producing a blocked polyrotaxane is disclosed.
- the obtained polyrotaxane is washed with a mixed solvent of dimethylformamide / methanol and then dissolved in dimethylsulfoxide, and this solution is dropped into water to precipitate polyrotaxane, followed by centrifugation. It is purified by a method of solid-liquid separation by separation to remove free cyclodextrins that degrade the properties of the crosslinked polyrotaxane.
- the purified polyrotaxane from which the free cyclodextrin has been removed in this way is suitable as a raw material for the crosslinked polyrotaxane immediately after production. There is a case.
- polyrotaxane Even when free cyclodextrin is removed, when polyrotaxane from which cyclodextrin is liberated in the course of storage is used as a raw material for the crosslinked polyrotaxane, the properties of the crosslinked polyrotaxane deteriorate. Therefore, if the characteristics of the crosslinked polyrotaxane are to be expressed effectively, repurification is required before use as a raw material for the crosslinked polyrotaxane, and the storage stability with suppressed cyclodextrin release is excellent.
- a polyrotaxane is desired.
- the objective of this invention is providing the polyrotaxane composition which solved said subject and was excellent in storage stability.
- the present invention is a polyrotaxane having a cyclodextrin, a polyethylene glycol clasped into the cyclodextrin, and a blocking group disposed at both ends of the polyethylene glycol to prevent the cyclodextrin from being removed, and It is a polyrotaxane composition containing a polyphenol antioxidant.
- the present invention is described in detail below.
- the present inventors have found that by adding a polyphenol antioxidant to a polyrotaxane, it is possible to obtain a polyrotaxane composition having low storage of cyclodextrin during storage and having excellent storage stability. It came to be completed.
- the polyrotaxane composition of the present invention has a cyclodextrin, a polyethylene glycol clathrated in the cyclodextrin, and a blocking group that is disposed at both ends of the polyethylene glycol and prevents the cyclodextrin from being detached. Contains polyrotaxane.
- Polyrotaxane is usually a mixture of cyclodextrin and PEG, pseudopolyrotaxane in which the PEG is skewered at the opening of the cyclodextrin molecule, and both ends of the pseudopolyrotaxane are blocked with blocking groups, and cyclodextrin Is prepared so as not to be detached from the skewered state.
- the PEG has a weight average molecular weight of preferably 1,000 to 500,000, more preferably 10,000 to 300,000, and further preferably 10,000 to 100,000.
- the weight average molecular weight of the PEG is less than 1000, the resulting crosslinked polyrotaxane may have low properties.
- the weight average molecular weight of the PEG exceeds 500,000, the storage stability of the polyrotaxane may be lowered.
- the said weight average molecular weight is a value calculated
- the PEG preferably has reactive groups at both ends.
- a reactive group can be introduced into both ends of the PEG by a conventionally known method.
- the reactive group at both ends of the PEG can be appropriately changed depending on the type of blocking group employed, and is not particularly limited, and examples thereof include a hydroxyl group, an amino group, a carboxyl group, and a thiol group. Is preferred.
- As a method for introducing a carboxyl group into both ends of the PEG for example, using TEMPO (2,2,6,6-tetramethyl-1-piperidinyloxy radical) and sodium hypochlorite, Examples include a method of oxidizing both ends.
- cyclodextrin examples include ⁇ -cyclodextrin, ⁇ -cyclodextrin, ⁇ -cyclodextrin, and derivatives thereof.
- at least one selected from the group consisting of ⁇ -cyclodextrin, ⁇ -cyclodextrin, and ⁇ -cyclodextrin is preferable, and ⁇ -cyclodextrin is more preferable from the viewpoint of inclusion. preferable.
- These cyclodextrins may be used individually by 1 type, and may be used in combination of 2 or more type.
- the inclusion rate of the polyrotaxane is preferably 6 to 60%, although it depends on the application and intended use. If the inclusion rate of the polyrotaxane is less than 6%, the resulting crosslinked polyrotaxane may not exhibit a pulley effect. If the inclusion rate of the polyrotaxane exceeds 60%, cyclodextrin, which is a cyclic molecule, may be arranged too densely and the mobility of cyclodextrin may be reduced. In order for cyclodextrin to have an appropriate mobility and to allow the resulting crosslinked polyrotaxane to exhibit a good pulley effect, the inclusion rate of the polyrotaxane is more preferably 15 to 40%, and preferably 20 to 30%.
- the inclusion rate is a ratio of the inclusion amount of cyclodextrin containing PEG to the maximum inclusion amount of cyclodextrin in PEG, the mixing ratio of PEG and cyclodextrin, aqueous It can be arbitrarily adjusted by changing the type of the medium.
- the maximum inclusion amount refers to the number of cyclodextrins in the closest enclosure state in which one cyclodextrin is included in two repeating units of the PEG chain.
- the inclusion rate of the polyrotaxane can be measured by 1 H-NMR. Specifically, the inclusion rate was measured by dissolving polyrotaxane in DMSO-d 6 and measuring with an NMR measuring apparatus (“Varian Mercury-400BB” manufactured by Varian Technologies Japan). 4-6 ppm cyclodextrin It can be calculated by comparing the integrated value of the origin with the integrated values of 3-4 ppm cyclodextrin and PEG.
- polyphenol antioxidant in the polyrotaxane composition of the present invention examples include catechin, epicatechin, gallocatechin, catechin gallate, epicatechin gallate, gallocatechin gallate, epigallocatechin gallate, epigallocatechin, tannic acid, gallotannin, and ellagitannin.
- the polyphenol antioxidant is a natural compound widely contained in plants, it has a preferable feature that it is highly safe for human bodies.
- the polyrotaxane composition of the present invention not only has high storage stability by containing a polyphenol antioxidant as an antioxidant, but also provides the obtained crosslinked polyrotaxane to human bodies such as cosmetics and biomaterials. In applications that act directly, it can be used as a material with excellent quality stability and safety.
- the polyphenol antioxidant is excellent in antibacterial effect, and can be expected also in the antibacterial effect of the final product to which the crosslinked polyrotaxane is applied.
- the content of the polyphenol-based antioxidant is preferably 0.001 to 5% by weight, more preferably 0.005 to 2% by weight with respect to the polyrotaxane. More preferably, the content is 0.01 to 1% by weight. If the content of the polyphenol-based antioxidant is less than 0.001% by weight, the effect of improving the storage stability may not be observed. Even if the content of the polyphenol antioxidant exceeds 5% by weight, no further effect is obtained, which is not economical.
- the method for preparing the polyrotaxane composition of the present invention is not particularly limited, but when obtaining a dried solid polyrotaxane composition, the polyrotaxane and the polyphenolic oxidation are used as a solvent in order to uniformly mix the polyrotaxane and the polyphenolic antioxidant.
- a method for preparing a mixed solution containing a polyrotaxane, a polyphenolic antioxidant, and a solvent by adding an inhibitor and stirring and mixing, and drying the mixed solution provides a polyrotaxane composition having excellent storage stability. Therefore, a method of drying a mixed solution in which at least one of polyrotaxane and polyphenol-based antioxidant is dissolved in a solvent is more preferable because a polyrotaxane having further excellent storage stability can be obtained.
- polyphenolic antioxidant in the preparation of a mixed solution containing a polyrotaxane, a polyphenolic antioxidant, and a solvent, if the polyphenolic antioxidant is not dissolved in the solvent, it can be further preserved by mixing them as fine particles in advance.
- An excellent polyrotaxane composition can be obtained.
- a conventionally known method can be used as a method for making the polyphenol antioxidant fine particles, and examples thereof include mechanical pulverization by a pulverizer such as a ball mill and a pin mill, and refinement by crystallization.
- the volume average particle diameter of the polyphenol antioxidant is preferably 0.01-100 ⁇ m, more preferably 0.1-30 ⁇ m, More preferably, the thickness is 0.1 to 10 ⁇ m.
- the volume average particle diameter of the polyphenol antioxidant is less than 0.01 ⁇ m, not only adjustment by pulverization or crystallization is difficult, but there is no further effect of improving storage stability.
- the volume average particle size of the polyphenol-based antioxidant exceeds 100 ⁇ m, the polyrotaxane composition is not uniformly dispersed, and the effect of improving storage stability may be reduced.
- the volume average particle diameter of the polyphenol antioxidant can be measured with a laser diffraction particle size distribution analyzer.
- a conventionally known method such as reduced pressure drying or freeze drying can be used.
- the drying temperature in the drying varies depending on the drying apparatus used. For example, when a shelf-type vacuum dryer is used, the drying temperature may be 20 to 100 ° C. in order to suppress generation of radicals that induce polyrotaxane decomposition. It is preferably 40 to 90 ° C, more preferably 40 to 80 ° C. If the drying temperature is less than 20 ° C, drying may be insufficient. When the drying temperature exceeds 100 ° C., the polyrotaxane may be decomposed and the inclusion rate may be reduced.
- the system pressure in the drying is not particularly limited, the drying is usually performed at a pressure close to atmospheric pressure. Moreover, it is also possible to dry under reduced pressure, and it is preferable to dry at a pressure below atmospheric pressure.
- a polyrotaxane composition excellent in storage stability can be provided.
- Example 1 (1) Preparation of PEG having carboxyl groups at both ends by TEMPO oxidation of PEG 10 L of water was added to a 20 L reaction tank, 1 kg of PEG (molecular weight 35000), TEMPO (2,2,6,6-tetramethyl) 1-piperidinyloxy radical) 10 g and sodium bromide 100 g were dissolved. 500 mL of a commercially available aqueous sodium hypochlorite solution (effective chlorine concentration 5% by weight) was added and stirred at room temperature for 30 minutes. In order to decompose the remaining sodium hypochlorite, 500 mL of ethanol was added to terminate the reaction. Separation extraction using 5 L of methylene chloride was repeated three times to extract components other than inorganic salts, and then methylene chloride was removed by distillation under reduced pressure to obtain 1 kg of PEG having carboxyl groups at both ends.
- polyrotaxane composition 300 g of 0.1% by weight aqueous solution of rosmarinic acid (rosemary extract, “RM-21A base”, manufactured by Mitsubishi Chemical Foods, Inc.) as a polyphenol-based antioxidant (polyrotaxane) Rosmarinic acid (0.01 wt%) was added and mixed well to obtain a mixed solution containing polyrotaxane, rosmarinic acid and water.
- the obtained mixed solution was dried under reduced pressure at 60 ° C. for 16 hours using a reduced pressure dryer to obtain 3 kg of a polyrotaxane composition.
- the content of free cyclodextrin in the obtained polyrotaxane was measured by a high performance liquid chromatograph (“Alliance 2695” manufactured by Waters Co., Ltd.) and found to be 8% by weight.
- Example 2 In “(5) Preparation of polyrotaxane composition”, the polyrotaxane was the same as in Example 1 except that the concentration of the rosmarinic acid aqueous solution was 0.5% by weight (0.05% by weight of rosmarinic acid with respect to the polyrotaxane). 3 kg of composition was obtained. When measured in the same manner as in Example 1, the content of free cyclodextrin in the obtained polyrotaxane was 8% by weight.
- Example 3 In “(5) Preparation of polyrotaxane composition”, instead of 300 g of a 0.1 wt% aqueous solution of rosmarinic acid as a polyphenol-based antioxidant, 300 g of a 1 wt% aqueous solution of gallic acid (0.8 mg of gallic acid relative to the polyrotaxane was added. 3 kg of a polyrotaxane composition was obtained in the same manner as in Example 1 except that 1 wt%) was added. When measured in the same manner as in Example 1, the content of free cyclodextrin in the obtained polyrotaxane was 8% by weight.
- Example 4 In “(5) Preparation of polyrotaxane composition”, instead of 300 g of a 0.1% by weight aqueous solution of rosmarinic acid as a polyphenol antioxidant, a tea extract having a catechin content of 5% (manufactured by Nippon Chlorophyll, “Cateking” 3 kg of a polyrotaxane composition was obtained in the same manner as in Example 1 except that 300 g of a 1 wt% aqueous solution of S ”) (0.005 wt% of catechin with respect to the polyrotaxane) was added. When measured in the same manner as in Example 1, the content of free cyclodextrin in the obtained polyrotaxane was 8% by weight.
- a polyrotaxane composition excellent in storage stability can be provided.
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Abstract
Description
架橋ポリロタキサンは、擬ポリロタキサンの両末端に封鎖基を導入したポリロタキサンを複数架橋することで得られる。例えば、擬ポリロタキサンが、両末端に反応性基を有するポリエチレングリコール(以下、「PEG」ともいう)と該PEGを包接するシクロデキストリンとからなる場合、得られる架橋ポリロタキサンは、PEGの直鎖分子上に串刺し状に貫通されているシクロデキストリンが、当該直鎖分子に沿って移動可能(滑車効果)なために、張力が加わっても滑車効果によりその張力を均一に分散させることができる。そのため、架橋ポリロタキサンは、クラックや傷が生じにくいなど、従来の架橋ポリマーにない優れた特性を有する。
特許文献1に開示されている製造方法では、得られたポリロタキサンをジメチルホルムアミド/メタノールの混合溶媒で洗浄した後、ジメチルスルホキシドに溶解し、この溶液を水中に滴下してポリロタキサンを析出させて、遠心分離により固液分離する方法により精製し、架橋ポリロタキサンの特性を低下させる遊離シクロデキストリンを除去している。
本発明の目的は、上記の課題を解決し、保存安定性に優れたポリロタキサン組成物を提供することにある。
以下に、本発明を詳述する。
なお、本明細書において、前記重量平均分子量は、ゲルパーミエーションクロマトグラフィー(GPC)で測定を行い、PEG換算により求められる値である。GPCによってPEG換算による重量平均分子量を測定する際のカラムとしては、例えば、TSKgel SuperAWM-H(東ソー社製)などが挙げられる。
前記PEGの両末端に有する反応性基は、採用する封鎖基の種類により適宜変更することができ、特に限定されないが、水酸基、アミノ基、カルボキシル基、チオール基などが挙げられ、とりわけ、カルボキシル基が好ましい。前記PEGの両末端にカルボキシル基を導入する方法としては、例えば、TEMPO(2,2,6,6-テトラメチル-1-ピペリジニルオキシラジカル)と次亜塩素酸ナトリウムとを用いてPEGの両末端を酸化させる方法などが挙げられる。
なお、本明細書において前記包接率とは、PEGへのシクロデキストリンの最大包接量に対するPEGを包接しているシクロデキストリンの包接量の割合であり、PEGとシクロデキストリンの混合比、水性媒体の種類などを変化させることにより、任意に調整することが出来る。また、前記最大包接量とは、PEG鎖の繰り返し単位2つに対し、シクロデキストリンが1つ包接された最密包接状態とした場合のシクロデキストリンの個数をいう。
これらのポリフェノール系酸化防止剤は、単独で使用してもよいし、二種以上を組み合わせて使用してもよい。
なお、前記ポリフェノール系酸化防止剤の体積平均粒子径は、レーザー回折式粒度分布測定装置により測定することが出来る。
(1)PEGのTEMPO酸化による両末端にカルボキシル基を有するPEGの調製
20L容の反応槽内に、水10Lを加え、PEG(分子量35000)1kg、TEMPO(2,2,6,6-テトラメチル-1-ピペリジニルオキシラジカル)10g、臭化ナトリウム100gを溶解させた。市販の次亜塩素酸ナトリウム水溶液(有効塩素濃度5重量%)500mLを添加し、室温で30分間撹拌した。余った次亜塩素酸ナトリウムを分解させるために、エタノールを500mL添加して反応を終了させた。5Lの塩化メチレンを用いた分液抽出を3回繰り返して無機塩以外の成分を抽出した後、減圧留去にて塩化メチレンを除去し、両末端にカルボキシル基を有するPEG1kgを得た。
調製した両末端にカルボキシル基を有するPEG1kgに水35Lを加え、さらにα-シクロデキストリン4kgを加え、70℃まで加熱し溶解させた。攪拌下、4℃まで冷却し、乳液状に析出した擬ポリロタキサン水性分散体を得た。
調製した擬ポリロタキサン分散体40kgを、噴霧乾燥装置を用いて乾燥し、粉末状の乾燥体4.7kgを得た。なお、乾燥機気流入口温度は165℃、出口温度は90℃であった。
50L容のフラスコ内で、室温でジメチルホルムアミド(DMF)17Lにアダマンタンアミン45gを溶解し、得られた擬ポリロタキサン4.7kgに添加した後、速やかによく振りまぜた。
続いて、BOP試薬(ベンゾトリアゾール-1-イル-オキシ-トリス(ジメチルアミノ)ホスホニウム・ヘキサフルオロフォスフェート)130gをDMF8Lに溶解したものを添加し、速やかによく振りまぜた。
さらに、ジイソプロピルエチルアミン50mLをDMF8Lに溶解したものを添加し、得られた混合液を常温で一晩攪拌した。
得られた混合液をろ過後、得られた残渣に水30kgを加えて攪拌下で70℃まで昇温し、同温度で60分間攪拌して、再度ろ過した。
得られた残渣にポリフェノール系酸化防止剤としてロズマリン酸(ローズマリー抽出物、三菱化学フーズ社製、「RM-21Aベース」)の0.1重量%水溶液300g(ポリロタキサンに対して、ロズマリン酸0.01重量%)を加えてよく混合し、ポリロタキサンとロズマリン酸と水とを含有する混合液とした。得られた混合液を、減圧乾燥機を使用して60℃にて16時間減圧乾燥して、ポリロタキサン組成物3kgを得た。高速液体クロマトグラフ(ウォーターズ社製、「アライアンス2695」)により、得られたポリロタキサンの遊離シクロデキストリンの含有率を測定したところ、8重量%であった。
「(5)ポリロタキサン組成物の調製」において、ロズマリン酸水溶液の濃度を0.5重量%(ポリロタキサンに対して、ロズマリン酸0.05重量%)としたこと以外は、実施例1と同様にポリロタキサン組成物3kgを得た。実施例1と同様にして測定したところ、得られたポリロタキサンの遊離シクロデキストリンの含有率は8重量%であった。
「(5)ポリロタキサン組成物の調製」において、ポリフェノール系酸化防止剤としてロズマリン酸の0.1重量%水溶液300gに代えて、没食子酸の1重量%水溶液300g(ポリロタキサンに対して、没食子酸0.1重量%)を加えたこと以外は、実施例1と同様にポリロタキサン組成物3kgを得た。実施例1と同様にして測定したところ、得られたポリロタキサンの遊離シクロデキストリンの含有率は8重量%であった。
「(5)ポリロタキサン組成物の調製」において、ポリフェノール系酸化防止剤としてロズマリン酸の0.1重量%水溶液300gに代えて、カテキン含有量が5%の茶抽出物(日本葉緑素社製、「カテキングS」)の1重量%水溶液300g(ポリロタキサンに対して、カテキン0.005重量%)を加えたこと以外は、実施例1と同様にポリロタキサン組成物3kgを得た。実施例1と同様にして測定したところ、得られたポリロタキサンの遊離シクロデキストリンの含有率は8重量%であった。
「(5)ポリロタキサン組成物の調製」において、ロズマリン酸の0.1重量%水溶液を添加しなかったこと以外は、実施例1と同様の操作を行い、ポリロタキサンを得た。実施例1と同様にして測定したところ、得られたポリロタキサンの遊離シクロデキストリンの含有率は8重量%であった。
実施例で得られたポリロタキサン組成物および比較例で得られたポリロタキサンを40℃の恒温槽に保管し、高速液体クロマトグラフ(ウォーターズ社製、「アライアンス2695」)により30日目、および、120日目の遊離シクロデキストリン含有率を測定した。結果を作製直後のものとともに表1に示した。
Claims (6)
- シクロデキストリンと、前記シクロデキストリンに串刺し状に包接されるポリエチレングリコールと、前記ポリエチレングリコールの両末端に配置され前記シクロデキストリンの脱離を防止する封鎖基とを有するポリロタキサン、並びに、ポリフェノール系酸化防止剤を含有する
ことを特徴とするポリロタキサン組成物。 - ポリエチレングリコールの分子量が1000~50万である請求項1記載のポリロタキサン組成物。
- シクロデキストリンは、α-シクロデキストリン、β-シクロデキストリン、および、γ-シクロデキストリンからなる群より選ばれる少なくとも1種である請求項1または2記載のポリロタキサン組成物。
- ポリロタキサンの包接率が6~60%である請求項1、2または3記載のポリロタキサン組成物。
- ポリフェノール系酸化防止剤の含有量が、ポリロタキサンに対して0.001~5重量%である請求項1、2、3または4記載のポリロタキサン組成物。
- ポリフェノール系酸化防止剤は、ロズマリン酸、没食子酸、カテキン、エピカテキン、エピガロカテキン、エピカテキンガレート、および、エピガロカテキンガレートからなる群より選ばれる少なくとも1種である請求項1、2、3、4または5記載のポリロタキサン組成物。
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EP11861081.5A EP2687547B1 (en) | 2011-03-14 | 2011-12-05 | Polyrotaxane composition |
JP2013504518A JP6013319B2 (ja) | 2011-03-14 | 2011-12-05 | ポリロタキサン組成物 |
ES11861081.5T ES2620756T3 (es) | 2011-03-14 | 2011-12-05 | Composición de polirotaxano |
KR1020137026228A KR101840901B1 (ko) | 2011-03-14 | 2011-12-05 | 폴리로탁산 조성물 |
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US11779653B2 (en) | 2017-09-29 | 2023-10-10 | The Regents Of The University Of California | Multi-armed polyrotaxane platform for protected nucleic acid delivery |
US11230497B2 (en) | 2019-04-10 | 2022-01-25 | Saudi Arabian Oil Company | Cement additives |
CN110527108B (zh) * | 2019-08-29 | 2021-07-27 | 暨南大学 | 一种聚轮烷结构no供体材料及其制备方法与应用 |
US11279864B2 (en) * | 2019-10-04 | 2022-03-22 | Saudi Arabian Oil Company | Method of application of sliding-ring polymers to enhance elastic properties in oil-well cement |
CN113527545B (zh) * | 2021-08-19 | 2022-05-17 | 北京理工大学 | 一种具有准确穿嵌量的β-环糊精聚轮烷、制备方法及其应用 |
US11858039B2 (en) | 2022-01-13 | 2024-01-02 | Saudi Arabian Oil Company | Direct ink printing of multi-material composite structures |
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EP2687547A4 (en) | 2014-11-26 |
US9266972B2 (en) | 2016-02-23 |
JP6013319B2 (ja) | 2016-10-25 |
ES2620756T3 (es) | 2017-06-29 |
CA2829857C (en) | 2019-04-30 |
EP2687547A1 (en) | 2014-01-22 |
CN103403031B (zh) | 2016-06-08 |
KR20140011361A (ko) | 2014-01-28 |
JPWO2012124219A1 (ja) | 2014-07-17 |
CN103403031A (zh) | 2013-11-20 |
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CA2829857A1 (en) | 2012-09-20 |
KR101840901B1 (ko) | 2018-03-21 |
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