WO2014027669A1 - ピロロキノリンキノンテトラアルカリ塩及びその結晶、これらの製造方法、並びに、組成物 - Google Patents
ピロロキノリンキノンテトラアルカリ塩及びその結晶、これらの製造方法、並びに、組成物 Download PDFInfo
- Publication number
- WO2014027669A1 WO2014027669A1 PCT/JP2013/071914 JP2013071914W WO2014027669A1 WO 2014027669 A1 WO2014027669 A1 WO 2014027669A1 JP 2013071914 W JP2013071914 W JP 2013071914W WO 2014027669 A1 WO2014027669 A1 WO 2014027669A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- salt
- pqq
- pyrroloquinoline quinone
- tetraalkali
- crystal
- Prior art date
Links
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- 150000003839 salts Chemical class 0.000 title claims abstract description 126
- 239000013078 crystal Substances 0.000 title claims abstract description 71
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- 229910052708 sodium Inorganic materials 0.000 claims abstract description 13
- 229910052700 potassium Inorganic materials 0.000 claims abstract description 8
- 229910052792 caesium Inorganic materials 0.000 claims abstract description 7
- 229910052744 lithium Inorganic materials 0.000 claims abstract description 7
- 229910052701 rubidium Inorganic materials 0.000 claims abstract description 6
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- C07D471/02—Heterocyclic compounds containing nitrogen atoms as the only ring hetero atoms in the condensed system, at least one ring being a six-membered ring with one nitrogen atom, not provided for by groups C07D451/00 - C07D463/00 in which the condensed system contains two hetero rings
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Definitions
- the present invention relates to pyrroloquinoline quinone tetraalkali salt and crystals thereof, a production method thereof, and a composition.
- the pyrroloquinoline quinone is represented by the formula (2).
- PQQ pyrroloquinoline quinone
- free form may have a function as a new vitamin (coenzyme) and is useful for health supplements, cosmetics, etc.
- PQQ exists not only in bacteria but also in eukaryotic molds and yeasts, and plays an important role as a coenzyme.
- PQQ has been shown to promote cell growth, anti-cataract, liver disease prevention and treatment, wound healing, anti-allergy, reverse transcriptase inhibitor, glyoxalase I inhibitor, and anticancer action, etc. It has been shown to have many physiological activities.
- Non-patent Document 2 PQQ is alkaline and decomposes, so the structure of the crystallized product under alkaline conditions has not been studied.
- pyrroloquinoline quinone and its salt have low solubility, so it is difficult to make a high concentration aqueous solution.
- an aqueous solution is most used when provided in the food and pharmaceutical fields, an aqueous solution in which PQQ dissolves at a high concentration and does not precipitate is required.
- pyrroloquinoline quinone has a problem that it easily changes color by reacting with ascorbic acid.
- the present invention has been made in view of the above problems, does not require a special reagent, has high solubility in a solvent, can obtain a high-concentration pyrroloquinoline quinone aqueous solution, and uses ascorbic acid in combination. It is an object of the present invention to provide a pyrroloquinoline quinone tetraalkali salt and a crystal thereof, a simple production method thereof, and a composition which are not easily discolored and have high quality and high purity.
- the present inventors have found that the above-mentioned problems can be solved by using a pyrroloquinoline quinone salt having a predetermined structure, and have completed the present invention.
- M is each independently 1 type chosen from the group which consists of Li, K, Na, Rb, and Cs.
- a crystal comprising the pyrroloquinoline quinone tetraalkali salt described in [1] above.
- the 2 ⁇ peaks are 5.89 ⁇ 0.4 °, 11.72 ⁇ 0.4 °, 12.43 ⁇ 0.4 °, 13.59 ⁇ .
- a method for producing crystals of pyrroloquinoline quinone tetraalkali salt comprising a mixing step of mixing pyrroloquinoline quinone and / or pyrroloquinoline quinone alkali salt and an alkali metal compound under strongly alkaline conditions.
- a food comprising the pyrroloquinoline quinone tetraalkali salt according to [1], the crystal according to any one of [2] to [5], and / or the composition according to [6].
- a cosmetic comprising the pyrroloquinoline quinone tetraalkali salt according to [1], the crystal according to any one of [2] to [5], and / or the composition according to [6].
- a pyrroloquinoline quinone tetraalkali salt having a high quality and high purity which is highly soluble in a solvent and capable of obtaining a high-concentration pyrroloquinoline quinone aqueous solution, hardly discolored even in combination with ascorbic acid, and
- the crystals, methods for their production, and compositions can be provided.
- FIG. 3 is a powder X-ray diffraction result of PQQ tetrasodium salt obtained in Example 3.
- FIG. 3 is a powder X-ray diffraction result of PQQ tetrasodium salt obtained in Example 4.
- the present embodiment a mode for carrying out the present invention (hereinafter referred to as “the present embodiment”) will be described in detail.
- the present invention is not limited to this, and various modifications can be made without departing from the gist thereof. Is possible.
- PQQ tetraalkali salt The pyrroloquinoline quinone tetrasodium salt (hereinafter also referred to as “PQQ tetraalkali salt”) according to the present embodiment is represented by the formula (1).
- M is each independently 1 type chosen from the group which consists of Li, K, Na, Rb, and Cs.
- the alkali metal M contained in the PQQ tetraalkali salt is each independently one selected from the group consisting of Li, K, Na, Rb, and Cs.
- the kind of alkali metal contained in the PQQ tetraalkali salt may be one kind, or two or more kinds. Among these, PQQ tetraalkali salts having one kind of alkali metal are preferable.
- a PQQ tetraalkali salt having one kind of alkali metal tends to be easily prepared from a free form of PQQ.
- a PQQ tetraalkali metal containing two or more alkali metals is also preferable.
- PQQ tetraalkali salt containing 2 or more types of alkali metals since a disodium salt is marketed, since a raw material is easy to obtain, PQQ tetraalkali containing sodium and other alkali metal ions is included. Salts are preferred.
- the PQQ tetraalkali salt according to the present embodiment may contain water, a solvent, or an alkali metal compound as long as it is 50% by mass or less.
- the crystal according to the present embodiment contains the pyrroloquinoline quinone tetraalkali salt.
- pyrroloquinoline quinone tetrasodium salt in which at least one of M in the formula (1) is Na is preferable
- pyrroloquinoline quinone tetrasodium salt in which all of M in the formula (1) is Na is more preferable. preferable.
- the pyrroloquinoline quinone tetraalkali salt is preferably a crystal from the viewpoints of purity and stability. Whether the pyrroloquinoline quinone tetraalkali salt is a crystal can be confirmed by a microscope, powder X-ray diffraction (hereinafter sometimes abbreviated as XRD), single crystal X-ray analysis, and / or electron diffraction. is there.
- XRD powder X-ray diffraction
- the peaks of 2 ⁇ are 5.89 ⁇ 0.4 °, 11.72 ⁇ 0.4 °, 12.43 ⁇ 0.4 °, 13.59 ⁇ 0.4 °, 18.09 ⁇ 0.4 °, 23.93 ⁇ 0.4 °, 26.50 ⁇ 0.4 °, 29.40 ⁇ 0 It preferably appears at 4 °.
- Measurement of the diffraction angle 2 ⁇ by powder X-ray diffraction can be performed, for example, under the following measurement conditions. In addition, it can also be observed with a general powder X-ray diffractometer equipped with a monochromator. (Measurement condition) Apparatus: RINT2500 manufactured by Rigaku Corporation X-ray: Cu / tube voltage 40 kV / tube current 100 mA Scan speed: 4.000 ° / min Sampling width: 0.020 °
- the PQQ tetrasodium salt crystal according to the present embodiment measured by single crystal X-ray structural analysis preferably has the following dimensions, for example.
- the relative intensity of each peak in the single-crystal X-ray structure analysis of the PQQ tetrasodium salt crystal according to this embodiment can be expressed in Table 1 according to the evaluation criteria in Table 2 below.
- the relative intensity is calculated as a percentage of the peak with the maximum intensity.
- the method for producing a PQQ tetraalkali salt and a crystal thereof according to the present embodiment comprises PQQ or a PQQ alkali salt (hereinafter, also collectively referred to as “PQQs”) and an alkali metal compound under strongly alkaline conditions.
- PQQs PQQ or a PQQ alkali salt
- a mixing step of mixing. The mixing step can be performed in the presence of a solvent.
- the mixing ratio of PQQs and alkali metal compounds is preferably 3.5 to 10000 mols, more preferably 4 to 1000 mols, and even more preferably 4 to 700 mols per mol of PQQs.
- PQQs tend to dissolve more.
- the mixing ratio is 10,000 mol or less, the alkalinity does not become too high and tends to be practically excellent.
- the mixing ratio of PQQs and sodium compounds is preferably 3.5 to 100,000 moles of sodium compound and more preferably 4 to 1000 moles per mole of PQQs. 4 to 700 mol is more preferable.
- the mixing ratio is within the above range, the PQQ tetraalkali salt tends to precipitate more easily.
- the salt or salt crystals can be precipitated by lowering the solubility, and then the solvent can be removed.
- the solubility may be reduced by removing the solvent by lyophilization, reduced pressure drying, and / or heat drying at ⁇ 20 to 200 ° C., adding a poor solvent to form a salt or salt crystals.
- the method of making it precipitate etc. is mentioned.
- the sodium ion is 4 with respect to the PQQ ion 1 because it is easy to precipitate.
- the preferred mixing ratio may vary depending on the conditions for lowering the solubility, that is, the precipitation conditions.
- PQQs PQQs
- PQQs PQQs
- examples include PQQ free form, PQQ monoalkali salt, PQQ dialkali salt, and PQQ trialkal salt.
- Such PQQs are not particularly limited, and specific examples include sodium, potassium, lithium, cesium, or rubidium salts of PQQ, or ammonium salts of PQQ.
- the PQQ free form, sodium and potassium salts are more preferable, and the PQQ sodium salt that is most readily available is particularly preferable.
- the salt may be mono, di or tri. Of these, a disodium salt is preferable.
- PQQs may be used singly or in combination of two or more. Among these, the disodium salt is highly stable and has higher solubility than the free monoalkaline, so that it tends to be able to obtain the PQQ tetraalkali salt more efficiently.
- PQQ raw materials can be produced by an organic chemical synthesis method or a fermentation method.
- the salt of PQQ used for the raw material may be crystalline or amorphous. Further, impurities may be included.
- Alkali metal compound Although it does not specifically limit as an alkali metal compound to be used, for example, Lithium hydroxide, potassium hydroxide, sodium hydroxide, cesium hydroxide, rubidium hydroxide, lithium carbonate, potassium carbonate, sodium carbonate, cesium carbonate, rubidium carbonate, lithium bicarbonate, potassium bicarbonate, sodium bicarbonate, cesium bicarbonate Rubidium bicarbonate, lithium alkoxide, potassium alkoxide, sodium alkoxide, cesium alkoxide, rubidium alkoxide. Of these, sodium hydroxide is more preferable. By using inexpensive sodium hydroxide, there is a tendency that a PQQ tetrasodium salt composed of non-toxic sodium ions can be obtained more efficiently.
- the solvent that can be used in the mixing step is not particularly limited.
- water or a mixed solvent of water and another solvent is preferable.
- the strongly alkaline condition in the mixing step is preferably pH 10 to 14, more preferably pH 12 to 14, and still more preferably pH 13 to 14.
- This pH is a standard, and the preferred pH may change due to the influence of coexisting salts.
- adding an acid or an alkali to the solution in a mixing process is mentioned.
- an acid or an alkali for example, both inorganic and organic can be used.
- the alkali is not particularly limited, but for example, potassium hydroxide, lithium hydroxide, cesium hydroxide, rubidium hydroxide, sodium hydroxide, potassium carbonate, lithium carbonate, cesium carbonate, rubidium carbonate, sodium carbonate, potassium hydrogen carbonate, Examples thereof include lithium hydrogen carbonate, cesium hydrogen carbonate, rubidium hydrogen carbonate, sodium hydrogen carbonate, choline, and tetramethylammonium hydroxide.
- the acid is not particularly limited, and examples thereof include phosphoric acid, boric acid, hydrochloric acid, sulfuric acid, nitric acid, acetic acid, and citric acid.
- the reaction temperature when the salt is formed in a solvent is not particularly limited, but is preferably ⁇ 20 to 140 ° C., more preferably ⁇ 10 to 90 ° C., and further preferably 0 to 70 ° C.
- the time required for the salt formation in the solvent varies depending on the mixing speed, stirring, temperature, concentration, etc., but is preferably 10 minutes to 7 days, more preferably 30 minutes to 5 days, and more preferably 1 hour to 3 days. More preferred is days.
- alkali metal compounds such as sodium to PQQs progresses and the number of alkali metals added increases, the solubility of the resulting PQQ alkali salt in water improves.
- the PQQ tetraalkali salt formed in water or an organic solvent can be obtained by precipitation, concentration, drying, temperature reduction, addition of a poor solvent, salting out, or pH change.
- the poor solvent needs to be selected according to the solvent in the mixing process to be used.
- a water-soluble organic solvent can be used.
- the water-soluble organic solvent is not particularly limited, and specifically, methanol, ethanol, 2-propanol, butanol, glycerin, propylene glycol, ethylene glycol, polyethylene glycol, dioxane, dimethyl sulfoxide, dimethylacetamide, dipropylene glycol, Examples include methoxypropylene glycol, methoxyethylene glycol, methoxydipropylene glycol, and methoxydiethylene glycol. Among these, alcohol is preferable.
- the PQQ tetraalkali salt can also be prepared by bringing a PQQ and a sodium compound into contact with each other and adding a solvent (poor solvent) in which the PQQ is hardly dissolved to the solvent in which the PQQ is dissolved to lower the solubility. .
- the pH when the raw material is dissolved is not particularly limited. It is desirable that the pH is from 3 to 14, more preferably from 5 to 13, which is easy to use. You may adjust by adding an alkaline sodium compound solution for pH adjustment.
- the temperature at this time may be 0 to 140 ° C.
- a tetrasodium salt can be prepared by adding a sodium compound to this solution to bring the pH to 10 or higher.
- the reaction time is not particularly limited, but can be carried out in 5 minutes to 1 week. If the scale is small, it takes a short time, but if it is large, it takes a long time.
- the temperature at this time may be used at -20 to 140 ° C, preferably 0 to 80 ° C.
- the reacted liquid can be dried or recrystallized to obtain a salt as a solid.
- the solvent for recrystallization may be performed in water or an organic solvent.
- the obtained solid may be dried at normal pressure and reduced pressure.
- the temperature at this time may be 0 to 140 ° C., and a potassium hydroxide compound can be added to this solution to prepare a tetrapotassium salt.
- the reaction time is not particularly limited, but can be carried out in 5 minutes to 1 week. If the scale is small, it takes a short time, but if it is large, it takes a long time.
- the temperature at this time may be used at -20 to 140 ° C, preferably 0 to 80 ° C.
- the reacted liquid can be dried or recrystallized to obtain a salt as a solid.
- the solvent for recrystallization may be performed in water or an organic solvent.
- the obtained solid may be dried at normal pressure and reduced pressure.
- the PQQ tetraalkali salt according to the present embodiment may be mixed with raw material PQQs in addition to the target PQQ tetraalkali salt.
- the mixing ratio of the PQQ tetraalkali salt and the PQQs can be designed according to the purpose.
- the mixing ratio of the PQQ tetraalkali salt and the PQQ is preferably such that the PQQ tetraalkali salt is 0.01 to 100, more preferably 0.02 to 50, and more preferably 0 to 0. .05 to 20 is more preferable.
- composition includes the PQQ tetraalkali salt and / or the crystal of the PQQ tetrasodium salt and ascorbic acid.
- the PQQ tetraalkali salt according to this embodiment can be used as an active ingredient for humans or animals, such as pharmaceuticals, cosmetics, functional foods, or feeds. That is, it can be provided in the form of external preparations for skin, injections, oral preparations, suppositories, etc., or in the form of foods and drinks for daily consumption, nutrition-enhanced foods, various hospital foods and the like.
- water saccharides such as fructose and glucose, oils such as falling raw oil, soybean oil and olive oil, and glycols such as polyethylene glycol and polypropylene glycol are used as liquid agents. be able to.
- solid preparations such as tablets, capsules, granules, etc.
- sugars such as lactose, sucrose, mannitol, etc., kaolin, talc, magnesium stearate etc. as lubricants, starch, sodium alginate as disintegrants
- binder examples include polyvinyl alcohol, cellulose, and gelatin
- surfactant include fatty acid esters
- plasticizer include glycerin and the like, but are not limited thereto. You may add a dissolution accelerator, a filler, etc. as needed.
- the PQQ tetraalkali salt composition according to this embodiment may be mixed with raw material PQQs. By being mixed, it becomes easy to control the solubility and the dissolution rate.
- the mixing ratio can be designed according to the purpose.
- the mixing ratio of the PQQ tetraalkali salt and the PQQs is preferably such that the PQQ tetraalkali salt is 0.01 to 100, more preferably 0.05 to 20, more preferably 0 to the PQQs 1 by weight. 1 to 10 are more preferable.
- composition of the PQQ tetraalkali salt according to this embodiment may contain a solvent or an alkali compound.
- the content of the solvent or alkali compound is not particularly limited, but is preferably 50% by mass or less, more preferably 0 to 40% by mass, and still more preferably 0 to 30% by mass.
- the PQQ tetraalkali salt according to this embodiment can be used alone or in combination with other materials.
- Materials that can be combined include vitamins such as coenzyme Q10, vitamin B, vitamin C (ascorbic acid) or vitamin E, amino acids, carotenoids such as astaxanthin, ⁇ -carotene, ⁇ -carotene, docosahexaenoic acid or eicosapentaenoic acid Omega 3 fatty acids such as omega 6 and omega 6 fatty acids such as arachidonic acid are exemplified, but not limited thereto.
- ascorbic acid is likely to be altered when it comes into contact with water when mixed, but it is stable when the PQQ tetraalkali salt of this embodiment and ascorbic acid are mixed.
- the mixing ratio of PQQ tetraalkali salt and ascorbic acid is preferably 0.01 to 200 ascorbic acid with respect to PQQ tetraalkali salt 1 in terms of weight ratio. At ratios below this range, the alteration effect tends to be smaller.
- the food and cosmetics according to the present embodiment include the pyrroloquinoline quinone tetraalkali salt, its crystal, and / or the above composition.
- PQQ analysis PQQ was identified using the following equipment. Apparatus: Shimadzu Corporation, high performance liquid chromatography, Lc-20A Column: YMC-Pack ODS-Tms (5 ⁇ m), 150 ⁇ 4.6 mm D. Measurement temperature: 40 ° C Detection: Absorbance at 260 nm Eluent: 100 mM CH 3 COOH / 100 mM CH 3 COONH 4 (30/70, pH 5.1) Elution rate: 1.5 mL / min
- Example 1 PQQ tetrasodium salt (Na 4 PQQ)] (Single crystal production) PQQ disodium 2 g / L aqueous solution 500 ⁇ L and 25% sodium hydroxide aqueous solution 100 ⁇ L were mixed. At this time, the pH was 13.4. This solution was put into a 2 mL tube, and 1000 ⁇ L of methanol was slowly added to form two layers. When this solution was allowed to stand at room temperature, red crystals were precipitated after 4 days. This crystal was taken out and single crystal X-ray structure analysis was performed using a single crystal X-ray structure analyzer (VariMax with RAPID system manufactured by Rigaku Corporation) under the following conditions.
- a single crystal X-ray structure analyzer VariMax with RAPID system manufactured by Rigaku Corporation
- FIG. 1 The structure of the pyrroloquinoline quinone tetrasodium salt crystal composition is shown in FIG. 1 (ORTEP), FIG. 2 (ORTEP), FIG. 3 and Table 3.
- Table 4 shows the single crystal parameters.
- FIG. 3 shows that there are four PQQ tetrasodium salt crystals in one crystal lattice.
- FIG. 2 (b) shows the arrangement of two PQQ tetrasodium salts in the crystal lattice
- FIGS. 1 and 2 (a) show the structure of one PQQ tetrasodium salt contained in the crystal lattice. Only shows.
- This structure was a crystal containing sodium 16 and water 34 with respect to the PQQ skeleton 4 in the unit cell. That is, it corresponds to sodium 4 and water 8.5 per PQQ skeleton.
- the hydrogen atoms of the carboxylic acid and imidazole of the PQQ skeleton were eliminated and ion-bonded with sodium. It was found that the PQQ structure was not broken even under alkaline conditions.
- Example 2 Recrystallization with methanol 0.2 g of PQQ disodium was added to 100 mL of water, and 40 g of 25% aqueous sodium hydroxide solution was mixed. The pH at this time was 13.5. When 600 mL of methanol was added and left at room temperature for 2 days, red crystals were precipitated. The solution was filtered, washed with 2-propanol and dried under reduced pressure. 0.10 g of red crystals was obtained. From Example 2, it was shown that the synthesis of the crystal of Example 1 is possible even if the scale is increased.
- Example 3 Recrystallization with addition of ethanol Na / PQQ 4] 0.69 g of PQQ disodium was added to 14 mL of water, and 16.9 g of 25% aqueous sodium hydroxide solution was mixed. The pH at this time was 13.5. When 30 mL of ethanol was added thereto and left at room temperature for 1 day, red crystals were precipitated. The solution was filtered, washed with ethanol and dried under reduced pressure. 0.98 g of red crystals was obtained.
- FIG. 4 shows the powder X-ray diffraction results. As shown in FIG.
- Example 3 had almost the same structure as that of Example 1.
- FIG. 5 shows the powder X-ray diffraction results. As shown in FIG. 5, 5.82 °, 11.67 °, 12.35 °, 13.52 °, 16.31 °, 18.01 °, 23.88 °, 26.44 ° as 2 ⁇ peaks, Peaks were confirmed at 29.33 °, 29.99 °, and 43.75 °. The solid thus obtained was a crystalline substance. Although the colors are different, this peak indicates that the crystal obtained in Example 4 has almost the same structure as the crystal of Example 1.
- Example 5 PQQ tetralithium salt (Li 4 PQQ)] 0.72 g of PQQ free body was added to 50 mL of water. When 8 g of a lithium hydroxide aqueous solution prepared to 1 mol / kg was added thereto, the suspension changed into a uniform solution. At this time, the pH of the solution was 11. This solution was put into a 300 mL eggplant flask, and all water was blown off by an evaporator. Furthermore, it dried with the vacuum dryer and obtained black solid 0.79g.
- Example 6 PQQ disodium dilithium salt (Li 2 Na 2 PQQ)] 0.38 g of PQQ disodium was added to 50 mL of water.
- a lithium hydroxide aqueous solution prepared to 1 mol / kg was added thereto, the suspension changed to a uniform solution.
- the pH of the solution was 11. This solution was put into a 300 mL eggplant flask, and all water was blown off by an evaporator. Furthermore, it dried with the vacuum dryer and obtained black-red solid 0.38g.
- Example 7 PQQ tetrapotassium salt (K 4 PQQ)] 0.72 g of PQQ free body was added to 50 mL of water. When 8 g of an aqueous potassium hydroxide solution adjusted to 1 mol / kg was added thereto, the suspension changed into a uniform solution. At this time, the pH was 11. This solution was put into a 300 mL eggplant flask, and all water was blown off by an evaporator. Furthermore, it dried with the vacuum dryer and obtained 0.89g of black solids.
- Example 8 PQQ tetrasodium salt (Na 4 PQQ) / PQQ trisodium salt (Na 3 PQQ)] 0.75 g of PQQ disodium was added to 50 mL of water, and 0.48 g of 25 wt% sodium hydroxide was mixed. This solution was put into a 300 mL eggplant flask, and all water was blown off by an evaporator. Furthermore, it dried with the vacuum dryer and obtained 0.87g of solids.
- PQQ tetrasodium salt had a faster dissolution rate than PQQ disodium salt. It was also found that the dissolution rate can be changed by mixing PQQ disodium salt and PQQ tetrasodium salt. In more detail, it can be seen that the amount of dissolution of the mixture after 30 minutes after 1 minute is larger than when one type of salt is used, and that the amount of dissolution over time can be controlled by using a mixed salt. It was.
- the tetrasodium alkali salt of PQQ of the present invention has industrial applicability in the fields of foods, pharmaceuticals, cosmetics, feeds and the like.
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Abstract
Description
〔1〕
下記式(1)で表される、ピロロキノリンキノンテトラアルカリ塩。
〔2〕
前項〔1〕に記載のピロロキノリンキノンテトラアルカリ塩を含む、結晶。
〔3〕
上記式(1)中のMの少なくとも1つがNaである、前項〔2〕に記載の結晶。
〔4〕
粉末X線回折においてCu-Kαを用いた際に、2θのピークが、5.89±0.4°,11.72±0.4°,12.43±0.4°,13.59±0.4°,18.09±0.4°,23.93±0.4°,26.50±0.4°,29.40±0.4°に現れる、前項〔2〕又は〔3〕に記載の結晶。
〔5〕
単結晶X線構造分析により測定される以下のディメンジョン:
単位格子寸法
a=21.6072(5)Å
b=6.80401(17)Å
c=30.1070(7)Å
V=4426.20(18)Å3
を有する、前項〔2〕~〔4〕のいずれか1項に記載の結晶。
〔6〕
前項〔1〕に記載のピロロキノリンキノンテトラアルカリ塩、及び/又は、前項〔2〕~〔5〕のいずれか1項に記載の結晶と、
アスコルビン酸と、
を含む、組成物。
〔7〕
ピロロキノリンキノン及び/又はピロロキノリンキノンアルカリ塩と、アルカリ金属化合物と、を強アルカリ性条件下で混合させる混合工程を有する、ピロロキノリンキノンテトラアルカリ塩の製造方法。
〔8〕
アルカリ金属化合物が水酸化ナトリウムである、前項〔7〕に記載のピロロキノリンキノンテトラアルカリ塩の製造方法。
〔9〕
前記混合工程における強アルカリ性条件が、pH10~14である、前項〔7〕又は〔8〕に記載のピロロキノリンキノンテトラアルカリ塩の製造方法。
〔10〕
前記混合工程後、得られるピロロキノリンキノンテトラアルカリ塩の貧溶媒を添加する析出工程をさらに有する、前項〔7〕~〔9〕いずれか1項に記載のピロロキノリンキノンテトラアルカリ塩の製造方法。
〔11〕
ピロロキノリンキノン及び/又はピロロキノリンキノンアルカリ塩と、アルカリ金属化合物と、を強アルカリ性条件下で混合させる混合工程を有する、ピロロキノリンキノンテトラアルカリ塩の結晶の製造方法。
〔12〕
前項〔1〕に記載のピロロキノリンキノンテトラアルカリ塩、前項〔2〕~〔5〕のいずれか1項に記載の結晶、及び/又は、前項〔6〕に記載の組成物を含む、食品。
〔13〕
前項〔1〕に記載のピロロキノリンキノンテトラアルカリ塩、前項〔2〕~〔5〕のいずれか1項に記載の結晶、及び/又は、前項〔6〕に記載の組成物を含む、化粧品。
本実施形態に係るピロロキノリンキノンテトラナトリウム塩(以下、「PQQテトラアルカリ塩」ともいう。)は、式(1)で表される。
本実施形態に係る結晶は、上記ピロロキノリンキノンテトラアルカリ塩を含む。このなかでも、上記式(1)中のMの少なくとも1つがNaであるピロロキノリンキノンテトラナトリウム塩が好ましく、上記式(1)中のMの全てがNaであるピロロキノリンキノンテトラナトリウム塩がより好ましい。
(測定条件)
装置 :株式会社RIGAKU製RINT2500
X線 :Cu/管電圧40kV/管電流100mA
スキャンスピード:4.000°/min
サンプリング幅 :0.020°
単位格子寸法
a=21.6072(5) Å
b=6.80401(17) Å
c=30.1070(7) Å
V=4426.20(18) Å3
本実施形態に係るPQQテトラアルカリ塩及びその結晶の製造方法は、PQQ、又は、PQQアルカリ塩(以下、まとめて「PQQ類」ともいう。)と、アルカリ金属化合物と、を強アルカリ性条件下で混合させる混合工程を有する。なお、混合工程は、溶媒存在下で行うことができる。
使用しうるPQQ類としては、特に限定されないが、例えば、PQQのフリー体、PQQモノアルカリ塩、PQQジアルカリ塩、PQQトリアルカリ塩が挙げられる。このようなPQQ類としては、特に限定されないが、具体的には、PQQの、ナトリウム、カリウム、リチウム、セシウム、若しくはルビジュウムの塩、又はPQQのアンモニウム塩が挙げられる。このなかでもより好ましくは、PQQの、フリー体、ナトリウム、カリウムの塩であり、最も手に入れやすいPQQのナトリウム塩が特に好ましい。なお、塩としてはモノ、ジ、トリのどれでもよい。このなかでも、好ましくはジナトリウム塩である。PQQ類は、1種単独で用いても、2種以上を混合して用いてもよい。このなかでもジナトリウム塩は安定性が高く、フリー体モノアルカリ体より溶解度が高いため、PQQテトラアルカリ塩をより効率よく得ることができる傾向にある。
使用するアルカリ金属化合物としては、特に限定されないが、例えば、
水酸化リチウム、水酸化カリウム、水酸化ナトリウム、水酸化セシウム、水酸化ルビジューム、炭酸リチウム、炭酸カリウム、炭酸ナトリウム、炭酸セシウム、炭酸ルビジューム、重炭酸リチウム、重炭酸カリウム、重炭酸ナトリウム、重炭酸セシウム、重炭酸ルビジューム、リチウムアルコキシド、カリウムアルコキシド、ナトリウムアルコキシド、セシウムアルコキシド、ルビジュームアルコキシドである。このなかでも、より好ましくは水酸化ナトリウムである。安価である水酸化ナトリウムを用いることにより、毒性のないナトリウムイオンからなるPQQテトラナトリウム塩をより効率よく得ることができる傾向にある。
本実施形態に係る組成物は、上記PQQテトラアルカリ塩、及び/又は、上記PQQテトラナトリウム塩の結晶と、アスコルビン酸と、を含む。
PQQは以下の装置を用いて同定した。
装置: 島津製作所、高速液体クロマトグラフィー、Lc-20A
カラム:YMC-Pack ODS-Tms(5マイクロm)、150X4.6mm I.D.
測定温度:40℃
検出 :260nmにおける吸光度
溶離液 :100mM CH3COOH/100mM CH3COONH4(30/70,pH5.1)
溶出速度:1.5mL/min
PQQアルカリ塩のカチオン分析はダイオネクス製のイオンクロマトグラフィーで分析した。
Naイオンはホリバ社製ナトリウムイオンメーターで計測した。
(粉末X線回折測定条件)
装置 :株式会社RIGAKU製RINT2500
X線 :Cu/管電圧40kV/管電流100mA
スキャンスピード:4.000°/min
サンプリング幅 :0.020°
原料のPQQは特許第2692167号公報の培養法で得た。得られたカラム精製後、pH7で塩化ナトリウムを加えると赤い固体を得た。この固体を50%エタノールで洗浄し、塩化ナトリウムを除去して、PQQトリナトリウム塩を得た。
〔単結晶作製〕
PQQジナトリウム2g/L水溶液500μLと25%水酸化ナトリウム水溶液100μLを混合した。この時、pHは13.4であった。この溶液を2mLのチューブに入れ、ゆっくりとメタノール1000μLを加え、2層にした。この溶液を室温で置いたところ、4日後、赤色の結晶が析出した。この結晶を取り出し、単結晶X線構造解析装置(株式会社リガク社製VariMax with RAPID system)を用いて下記の条件にて、単結晶X線構造解析を行った。
X線源 :CuK(λ=1.54187Å)
管電圧 :40kV
管電流 :30mA
測定温度 :-180℃(吹付低温装置使用)
カメラ長 :127.4mm
振動角 :10°
露光時間 :200sec/deg
全測定枚数 :90枚(360枚×3シリーズ)
全測定時間:51時間57分(読み取り・消去時間を含む)。
Beq:等価等方性温度因子
この結晶構造は粉末X線回折データに変換して、結晶構造も確認できる。X線構造解析ソフトMercuryを使用して単結晶で得られたデータを変換した。
PQQジナトリウム0.2gを水100mLに加え、25%水酸化ナトリウム水溶液40gを混合した。この時のpHは13.5であった。ここにメタノール600mL加え、室温で2日置いておいたところ、赤い結晶が析出した。この溶液を濾過し、2-プロパノールで洗い、減圧乾燥した。赤い結晶0.10g得た。実施例2より、実施例1の結晶の合成はスケールを上げても可能であることが示された。
PQQジナトリウム0.69gを水14mLに加え、25%水酸化ナトリウム水溶液16.9gを混合した。この時のpHは13.5であった。ここにエタノール30mL加え、室温で1日置いておいたところ、赤い結晶が析出した。この溶液を濾過し、エタノールで洗い、減圧乾燥した。赤い結晶0.98gを得た。図4に粉末X線回折結果を示す。図4に示す様に、2θピークとして5.89°,11.72°,12.43°,13.59°,18.09°,23.93°,26.50°,29.40°,及び43.77°にピークが確認できた。このように得られた固体は結晶性物質であった。このピークより、実施例3により得られた結晶は実施例1の結晶とほぼ同じ構造をとっていることが分かった。
PQQジナトリウム0.37gを100mLに加え、25%水酸化ナトリウム水溶液0.32gを混合し、室温で1時間攪拌した。この時のpHは11であった。その後、エバポレーターで水を蒸発により除いて、0.41gの茶色の固体を得た。図5に粉末X線回折結果を示す。図5に示す様に、2θピークとして5.82°,11.67°,12.35°,13.52°,16.31°,18.01°,23.88°,26.44°,29.33°,29.99°,及び43.75°にピークが確認できた。このように得られた固体は結晶性物質であった。色は異なっているが、このピークより、実施例4により得られた結晶は実施例1の結晶とほぼ同じ構造をとっていることが分かった。
PQQフリー体0.72gを水50mLに加えた。ここに1mol/kgに調製した水酸化リチウム水溶液を8g加えたところ、懸濁液から均一な液に変わった。この際、溶液のpHは11だった。この溶液を300mLのナスフラスコに入れ、エバポレーターで水をすべて飛ばした。さらに減圧乾燥器によって乾燥して黒色の固体0.79gを得た。
PQQジナトリウム0.38gを水50mLに加えた。ここに1mol/kgに調製した水酸化リチウム水溶液を2g加えたところ、懸濁液から均一な液に変わった。この際、溶液のpHは11だった。この溶液を300mLのナスフラスコに入れ、エバポレーターで水をすべて飛ばした。さらに減圧乾燥器によって乾燥して黒赤色の固体0.38gを得た。
PQQフリー体0.72gを水50mLに加えた。ここに1mol/kgに調製した水酸化カリウム水溶液を8g加えたところ、懸濁液から均一な液に変わった。この際、pHは11だった。この溶液を300mLのナスフラスコに入れ、エバポレーターで水をすべて飛ばした。さらに減圧乾燥器によって乾燥して黒色の固体0.89gを得た。
PQQジナトリウム0.75gを水50mLに加え、25wt%水酸化ナトリウム0.48gを混合した。この溶液を300mLのナスフラスコに入れ、エバポレーターで水をすべて飛ばした。さらに減圧乾燥器によって乾燥して、固体0.87gを得た。
PQQジナトリウム0.37gを10mlに加え、25%水酸化ナトリウム水溶液0.80gを混合し、室温で0.5時間攪拌した。その後、エバポレーターにより溶媒を除いて、黄緑色の析出固体0.82gを得た。図6に粉末X線回折結果を示す。図6に示す様に、2θ5.77,7.00,9.52,21.44,22.25,32.35,37.48及び、その他多くのピークが確認できた。参考例1により得られた固体は結晶性物質であった。このピークより、参考例1により得られた固体が実施例1の結晶と異なる構造を有することが分かった。参考例1により得られた個体はPQQテトラカリウム塩と過剰の水酸化カリウムが存在する状態であると考えられる。
ピロロキノリンキノンフリー体0.72gを水50mLに加えた。ここに1mol/kgに調製した水酸化カリウム水溶液を10g加えたところ、懸濁液から均一な液に変わった。pHは11.5だった。この溶液を300mlのナスフラスコに入れ、エバポレーターで水をすべて飛ばした。さらに減圧乾燥器によって乾燥して黒色の固体1.04gを得た。
比較例1のPQQジナトリウム塩(Na2PQQ)及び比較例2PQQトリナトリウム塩(Na3PQQ)としては、参考例で作製したものを用いた。
表5に示す各PQQ塩を1g/Lになるように水に溶かした。この溶液1mLに100g/Lアスコルビン酸水溶液0.5mL加え、2時間後、1日後、2日後の状態を観察した。
表6に示す各PQQ塩50mgを過飽和になるように水0.5mL加えた。なお、この濃度で溶けてしまう場合は水を減らした。その後、溶液に対し室温23℃で超音波をかけた。この溶液を遠心分離器にかけ、上澄みをリン酸バッファー(pH7.4 GIBCO社製)を用いて、260nmにおける吸光度が0~1の範囲となるように希釈して、UV測定した。この吸収より溶解度を算出した。なお、UV測定には、HITACHI製U-2000spectrometerを使用した。その結果を表6に示す。
表7に示す各PQQ塩1mgをアクリル製吸光度測定セルに加え、水2mLを加え、450nmの吸光度を測定した。なお、UV測定には、HITACHI製U-2000spectrometerを使用した。全てのサンプルが溶けて均一になった吸光度を100として以下に時間変化を示す。
PQQジナトリウム2gを水900mLに溶かした、塩酸を使用してpHを3.1にした。ここにエタノールを900mL加え、冷蔵庫で1晩置いた。赤い固体が析出していた。この固体をイオンクロマトグラフィー及び液体クロマトグラフィーを使用して分析した結果、Na/PQQは2でPQQジナトリウム塩であった。回収率98%であった。このpHではPQQテトラナトリウム塩は得られなかった。
PQQジナトリウム4gを水900mLに溶かした水酸化ナトリウムとリン酸を使用してpHを7.5にした。ここにエタノールを900mL加え、冷蔵庫で1晩置いた。赤い固体が析出していた。この固体をイオンクロマトグラフィー及び液体クロマトグラフィーを使用して分析した結果、Na/PQQは3でPQQジナトリウム塩であった。回収率95%であった。このpHではPQQテトラナトリウム塩は得られなかった。
Claims (13)
- 請求項1に記載のピロロキノリンキノンテトラアルカリ塩を含む、結晶。
- 上記式(1)中のMの少なくとも1つがNaである、請求項2に記載の結晶。
- 粉末X線回折においてCu-Kαを用いた際に、2θのピークが、5.89±0.4°,11.72±0.4°,12.43±0.4°,13.59±0.4°,18.09±0.4°,23.93±0.4°,26.50±0.4°,29.40±0.4°に現れる、請求項2又は3に記載の結晶。
- 単結晶X線構造分析により測定される以下のディメンジョン:
単位格子寸法
a=21.6072(5)Å
b=6.80401(17)Å
c=30.1070(7)Å
V=4426.20(18)Å3
を有する、請求項2~4のいずれか1項に記載の結晶。 - 請求項1に記載のピロロキノリンキノンテトラアルカリ塩、及び/又は、請求項2~5のいずれか1項に記載の結晶と、
アスコルビン酸と、
を含む、組成物。 - ピロロキノリンキノン及び/又はピロロキノリンキノンアルカリ塩と、アルカリ金属化合物と、を強アルカリ性条件下で混合させる混合工程を有する、ピロロキノリンキノンテトラアルカリ塩の製造方法。
- アルカリ金属化合物が水酸化ナトリウムである、請求項7に記載のピロロキノリンキノンテトラアルカリ塩の製造方法。
- 前記混合工程における強アルカリ性条件が、pH10~14である、請求項7又は8に記載のピロロキノリンキノンテトラアルカリ塩の製造方法。
- 前記混合工程後、得られるピロロキノリンキノンテトラアルカリ塩の貧溶媒を添加する析出工程をさらに有する、請求項7~9いずれか1項に記載のピロロキノリンキノンテトラアルカリ塩の製造方法。
- ピロロキノリンキノン及び/又はピロロキノリンキノンアルカリ塩と、アルカリ金属化合物と、を強アルカリ性条件下で混合させる混合工程を有する、ピロロキノリンキノンテトラアルカリ塩の結晶の製造方法。
- 請求項1に記載のピロロキノリンキノンテトラアルカリ塩、請求項2~5のいずれか1項に記載の結晶、及び/又は、請求項6に記載の組成物を含む、食品。
- 請求項1に記載のピロロキノリンキノンテトラアルカリ塩、請求項2~5のいずれか1項に記載の結晶、及び/又は、請求項6に記載の組成物を含む、化粧品。
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JP2017031126A (ja) * | 2015-08-06 | 2017-02-09 | 三菱瓦斯化学株式会社 | ピロロキノリンキノン結晶の製造方法 |
CN107207494A (zh) * | 2015-01-19 | 2017-09-26 | 三菱瓦斯化学株式会社 | 溶解性高的丙酮加成吡咯喹啉醌盐 |
JP2018104312A (ja) * | 2016-12-26 | 2018-07-05 | 三菱瓦斯化学株式会社 | イミダゾピロロキノリン塩及びその製造方法、並びに、医薬品、化粧品及び食品 |
JPWO2018003531A1 (ja) * | 2016-06-29 | 2019-04-18 | 三菱瓦斯化学株式会社 | ピロロキノリンキノンモノナトリウム及びその製造方法、並びにそれを含む組成物 |
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