WO2023228443A1 - バイオフィルムを破壊するための溶液及びその製造方法 - Google Patents
バイオフィルムを破壊するための溶液及びその製造方法 Download PDFInfo
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- WO2023228443A1 WO2023228443A1 PCT/JP2022/044506 JP2022044506W WO2023228443A1 WO 2023228443 A1 WO2023228443 A1 WO 2023228443A1 JP 2022044506 W JP2022044506 W JP 2022044506W WO 2023228443 A1 WO2023228443 A1 WO 2023228443A1
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- biofilm
- solution
- biofilms
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 9
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims abstract description 52
- 241000894006 Bacteria Species 0.000 claims abstract description 39
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 31
- YZCKVEUIGOORGS-OUBTZVSYSA-N Deuterium Chemical compound [2H] YZCKVEUIGOORGS-OUBTZVSYSA-N 0.000 claims abstract description 24
- 229910052805 deuterium Inorganic materials 0.000 claims abstract description 24
- 238000000034 method Methods 0.000 claims description 6
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- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
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- VTAJIXDZFCRWBR-UHFFFAOYSA-N Licoricesaponin B2 Natural products C1C(C2C(C3(CCC4(C)CCC(C)(CC4C3=CC2)C(O)=O)C)(C)CC2)(C)C2C(C)(C)CC1OC1OC(C(O)=O)C(O)C(O)C1OC1OC(C(O)=O)C(O)C(O)C1O VTAJIXDZFCRWBR-UHFFFAOYSA-N 0.000 description 1
- 229920000161 Locust bean gum Polymers 0.000 description 1
- 208000005888 Periodontal Pocket Diseases 0.000 description 1
- 241000589517 Pseudomonas aeruginosa Species 0.000 description 1
- 241000519995 Stachys sylvatica Species 0.000 description 1
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- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
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- 239000012503 blood component Substances 0.000 description 1
- MKJXYGKVIBWPFZ-UHFFFAOYSA-L calcium lactate Chemical compound [Ca+2].CC(O)C([O-])=O.CC(O)C([O-])=O MKJXYGKVIBWPFZ-UHFFFAOYSA-L 0.000 description 1
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- LPLVUJXQOOQHMX-UHFFFAOYSA-N glycyrrhetinic acid glycoside Natural products C1CC(C2C(C3(CCC4(C)CCC(C)(CC4C3=CC2=O)C(O)=O)C)(C)CC2)(C)C2C(C)(C)C1OC1OC(C(O)=O)C(O)C(O)C1OC1OC(C(O)=O)C(O)C(O)C1O LPLVUJXQOOQHMX-UHFFFAOYSA-N 0.000 description 1
- 239000001685 glycyrrhizic acid Substances 0.000 description 1
- 229960004949 glycyrrhizic acid Drugs 0.000 description 1
- UYRUBYNTXSDKQT-UHFFFAOYSA-N glycyrrhizic acid Natural products CC1(C)C(CCC2(C)C1CCC3(C)C2C(=O)C=C4C5CC(C)(CCC5(C)CCC34C)C(=O)O)OC6OC(C(O)C(O)C6OC7OC(O)C(O)C(O)C7C(=O)O)C(=O)O UYRUBYNTXSDKQT-UHFFFAOYSA-N 0.000 description 1
- 235000019410 glycyrrhizin Nutrition 0.000 description 1
- LPLVUJXQOOQHMX-QWBHMCJMSA-N glycyrrhizinic acid Chemical compound O([C@@H]1[C@@H](O)[C@H](O)[C@H](O[C@@H]1O[C@@H]1C([C@H]2[C@]([C@@H]3[C@@]([C@@]4(CC[C@@]5(C)CC[C@@](C)(C[C@H]5C4=CC3=O)C(O)=O)C)(C)CC2)(C)CC1)(C)C)C(O)=O)[C@@H]1O[C@H](C(O)=O)[C@@H](O)[C@H](O)[C@H]1O LPLVUJXQOOQHMX-QWBHMCJMSA-N 0.000 description 1
- GPRLSGONYQIRFK-UHFFFAOYSA-N hydron Chemical compound [H+] GPRLSGONYQIRFK-UHFFFAOYSA-N 0.000 description 1
- 229950005954 ibuprofen piconol Drugs 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
- NFIDBGJMFKNGGQ-UHFFFAOYSA-N isopropylmethylphenol Natural products CC(C)CC1=CC=CC=C1O NFIDBGJMFKNGGQ-UHFFFAOYSA-N 0.000 description 1
- 239000000252 konjac Substances 0.000 description 1
- 235000010485 konjac Nutrition 0.000 description 1
- 210000002429 large intestine Anatomy 0.000 description 1
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- 229920002521 macromolecule Polymers 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
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- 244000005700 microbiome Species 0.000 description 1
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- 210000000214 mouth Anatomy 0.000 description 1
- 108020004707 nucleic acids Proteins 0.000 description 1
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- 150000007523 nucleic acids Chemical class 0.000 description 1
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- 230000001590 oxidative effect Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- FJKROLUGYXJWQN-UHFFFAOYSA-N papa-hydroxy-benzoic acid Natural products OC(=O)C1=CC=C(O)C=C1 FJKROLUGYXJWQN-UHFFFAOYSA-N 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
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- 102000004196 processed proteins & peptides Human genes 0.000 description 1
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- 229960004889 salicylic acid Drugs 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
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- 235000017557 sodium bicarbonate Nutrition 0.000 description 1
- 229910000030 sodium bicarbonate Inorganic materials 0.000 description 1
- 241000894007 species Species 0.000 description 1
- SEEPANYCNGTZFQ-UHFFFAOYSA-N sulfadiazine Chemical compound C1=CC(N)=CC=C1S(=O)(=O)NC1=NC=CC=N1 SEEPANYCNGTZFQ-UHFFFAOYSA-N 0.000 description 1
- 229960004306 sulfadiazine Drugs 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
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- 239000003765 sweetening agent Substances 0.000 description 1
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- 229920001285 xanthan gum Polymers 0.000 description 1
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Classifications
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
- A01N59/00—Biocides, pest repellants or attractants, or plant growth regulators containing elements or inorganic compounds
- A01N59/02—Sulfur; Selenium; Tellurium; Compounds thereof
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01P—BIOCIDAL, PEST REPELLANT, PEST ATTRACTANT OR PLANT GROWTH REGULATORY ACTIVITY OF CHEMICAL COMPOUNDS OR PREPARATIONS
- A01P1/00—Disinfectants; Antimicrobial compounds or mixtures thereof
Definitions
- This invention relates to a solution for destroying biofilms and a method for producing the same.
- a biofilm is a membrane that surrounds bacteria and is formed when bacteria and the like that adhere to a substrate secrete extracellular polysaccharides (EPS).
- EPS plays the role of a barrier that protects bacteria, a transport route for bacteria to take in nutrients, and a role that protects bacteria inside biofilms from environmental changes and chemical substances.
- the biofilm which is the matrix of the higher-order structure, is dotted with microcolonies such as trapped bacteria.
- microcolonies such as trapped bacteria.
- a wide variety of microorganisms can exist in the colony, including bacteria, fungi, algae, and protozoa.
- Biofilms are found in the natural world, such as ponds and rivers, and in the environment, such as in the drainage pipes of buildings. And the hospital environment is no exception. Biofilms are formed not only in the environment but also in the human body, and have become a major medical problem, particularly in the medical field, where they are associated with chronic and intractable infections.
- biofilms by bacteria, etc. not only significantly reduces the effectiveness of drugs, but also allows the bacteria themselves to acquire the ability to withstand drugs.
- the mechanism by which this drug resistance is acquired is that the formation of a biofilm physically makes it difficult for antibiotics to penetrate into the biofilm, and the matrix and antibiotics bind to each other, reducing the efficacy of the drug. is being considered.
- Pseudomonas aeruginosa that has formed a biofilm is several hundred times more resistant to antibiotics than floating cells, making drug treatment difficult.
- bacteria produce biofilms in periodontal pockets, causing periodontal disease that is difficult to treat.
- the invention described in Patent Document 1 aims to destroy the biofilm produced by P. acnes and contains isopropylmethylphenol, salicylic acid, glycyrrhizic acid, ibuprofenpiconol, sulfadiazine and their salts, ethanol, resorcinol, sulfur, and At least one P. acnes biofilm-destroying component selected from the group consisting of benzoyl peroxide.
- the invention described in Patent Document 2 relates to a method for disrupting biofilms in cystic fibrosis patients, which comprises isolated or recombinant integrated host factor (IHF) polypeptides, or their respective fragments or equivalents. is used.
- IHF integrated host factor
- the drug for destroying biofilm described in Patent Document 3 is for suppressing bad breath, and contains sodium bicarbonate and hypochlorous acid as essential components.
- This drug is characterized by the use of water channels that exist on the surface of the biofilm, which are inorganic materials with relatively small molecular weights (within a molecular weight of 200) that allow blood components, which are a source of nutrients for bacteria, to pass through. .
- a nanochannel through which only ultra-low molecular weight disinfectants with a molecular weight of 100 or less can pass through.
- JP 2021-165284 Publication Japanese Patent Application Publication No. 2020-037595 International Publication WO2010/004699 Publication
- Biofilms are composed of a wide variety of components, such as polysaccharides, proteins, nucleic acids, and lipids, and the amounts and biochemical properties of each component produced by biofilms vary depending on the bacterial species and strain.
- Patent Documents 1 and 2 are characterized in that biofilms are destroyed according to the characteristics of each bacteria and the characteristics of biofilms, so there is a problem that they cannot be applied to biofilms in general.
- the above-mentioned Patent Document 3 has a technical idea of sending a drug through water channels and nanochannels that biofilms generally have, but according to the description in Patent Document 3, a liquid containing hypochlorous acid as a main component is Since the chlorine concentration must be concentrated to several hundred ppm, it must be washed away immediately after use.
- the purpose of this invention is to provide a solution that is gentle on the human body and effectively destroys biofilms, and a method for producing the same.
- the present invention (1) is a solution for destroying biofilms, which is composed of water (H 2 O) and deuterium sulfuric acid (D 2 SO 4 ) and has a pH of 0.5 or more and 4.0 or less.
- Extracellular polymeric substances which are biofilms, are composed of polysaccharides and proteins, and also contain macromolecules such as DNA, lipids, and humic substances. Exopolysaccharides are generally composed of monosaccharides and non-carbohydrate substituents.
- a solution prepared by diluting deuterium sulfuric acid (D 2 SO 4 ) with water (H 2 O) and adjusting the pH to 0.5 or more and 2.0 or less is a highly acidic solution and contains extracellular polysaccharides (EPS). It has the ability to easily pass through the water channels and nanochannels of biofilms and decompose internal extracellular polysaccharides. Furthermore, by using deuterium sulfuric acid (D 2 SO 4 ) as the component that increases the hydrogen ion concentration and lowers the pH, a solution that is gentle on the human body and that effectively destroys biofilms can be obtained.
- EPS extracellular polysaccharides
- the upper limit of the diluted pH is preferably 4.0 or less, 3.0 or less, 2.0 or less, 1.9 or less, 1.8 or less, 1.7 or less, 1.6 or less, 1.5 or less,
- the preferred values are 1.4 or less, 1.3 or less, 1.2 or less, and 1.1 or less, in order. This is because the lower the pH of the biofilm-destroying solution of the present application, the higher the efficacy of degrading extracellular polysaccharides (EPS).
- the lower limit of pH is preferably 0.5 or higher, since biofilm can be effectively decomposed.
- the lower limit of pH is preferably 0.6 or more, 0.7 or more, 0.8 or more, 0.9 or more, and 1.0 or more, in order, considering the influence on cells.
- Polysaccharides which are components of biofilms, are substances in which many monosaccharides such as glucose are linked together, and these polysaccharides can be decomposed by a mechanism called oxidative water decomposition in a low pH solution. In particular, when the pH is 2 or less, polysaccharides are efficiently decomposed. Further, by using deuterium sulfuric acid (D 2 SO 4 ), side effects (damage) to cell tissues are reduced.
- D 2 SO 4 deuterium sulfuric acid
- the present invention (2) dilutes deuterium sulfuric acid (D 2 SO 4 ) with water (H 2 O) to form a mixture of water (H 2 O) and deuterium sulfuric acid (D 2 SO 4 ) with a pH of 0.5 or more. This is a method for producing a solution for destroying biofilms of 4.0 or less.
- the method for producing a solution for destroying biofilm according to the present invention (2) uses water (H 2 O) to adjust the pH of deuterium sulfuric acid (D 2 SO 4 ) to 0.5 or more and 4.0 or less.
- the manufacturing method is simple as it only needs to be diluted.
- the disinfecting solution of the present invention is made by adjusting the pH of deuterium sulfuric acid (D 2 SO 4 ) using water (H 2 O).
- Deuterium sulfuric acid (D 2 SO 4 ) was purchased from Cambridge Isotope Laboratories, Inc. I used one made by Tap water was used as water (H 2 O).
- the solution for destroying biofilms of the present invention is composed of these two substances, trace components that do not or have little effect on the pH value may be added.
- the pH was measured using Horiba Model METRO-51.
- Starch syrup is a sticky sweetener made by saccharifying starch with acids and saccharifying enzymes, and is a mixture of glucose, maltose, dextrin, etc., with maltose being the main component.
- Co-op agar is a vegetable jelly base whose main ingredient is agar.
- the raw materials for Coop Agar are glucose, agar, konjac powder, thickeners (locust bean gum, xanthan gum), and calcium lactate.
- the basic raw material for both raw materials is polysaccharide.
- a biofilm-destroying solution adjusted to various pH values was added to a test product made by mixing starch syrup and cope agar, and the viscosity of the mixture was measured.
- the viscosity was measured using "Visco Tester (high viscosity type) VT-06" manufactured by Rion Co., Ltd.
- starch syrup and cope agar were mixed in a beaker at a ratio of 34:5, and the viscosity was measured using a Viscotester (high viscosity type) VT-06, and the viscosity was 460 dPa ⁇ S.
- a mixture of starch syrup and cope agar (test object) to be tested was weighed and prepared to have a weight of 150 g.
- D 2 SO 4 deuterium sulfuric acid
- FIG. 2 shows the results of an experiment investigating the safety of this biofilm-disrupting solution.
- the sample was wetted with deuterium sulfuric acid (D 2 SO 4 ) prepared in step 5, and observed after 20 hours.
- FIG. 2(A) shows the state of the leaf surface 20 hours after wetting with sulfuric acid (H 2 SO 4 ).
- the white spots surrounded by dotted lines are areas where leaf cells have died.
- FIG. 2(B) shows the state of the leaf surface 20 hours after wetting with deuterium sulfuric acid (D 2 SO 4 ).
- D 2 SO 4 deuterium sulfuric acid
- Streptococcus mutans is a facultative anaerobe and Gram-positive streptococcus. Produces insoluble, sticky glucan that sticks to the tooth surface. It is one of the bacteria that mainly causes dental caries.
- the medium used was THB (TODD-HEWITT BROTH) supplemented with 2% (w/v) sucrose.
- Sucrose is a sugar in which the monosaccharides glucose and fructose are bonded to ⁇ -1,2-glycoside, and is a type of disaccharide. THB manufactured by Becton Dickinson was used.
- sucrose As the sucrose, "CASRN” manufactured by Fuji Film Wako Pure Chemical Industries, Ltd. was used.
- the plate used for culturing was Thermo scientifica Nunclon Delta Surface 96well.
- the incubator used was a Panasonic multi-gas incubator MCO-5MUV-PJ. The culture was performed at 37 degrees Celsius in an atmosphere of 5% CO 2 gas, 5% O 2 gas, and 90% N 2 gas.
- the equipment for measuring the residual biofilm will be explained below.
- 0.1% crystal violet manufactured by Fuji Film Wako Pure Chemical Industries, Ltd. was dissolved in distilled water to a concentration of 0.1% (w/v).
- the microscope used for photography was EVOS XL core manufactured by Life technologies.
- the absorbance measuring device used was CORONA ELECTRIC SH-1000 Lab.
- the data processing software was "SF6" and the absorbance wavelength was 590 nm.
- Streptococcus mutans was diluted with THB containing 2% sucrose, and 100 ⁇ l of the diluted solution was inoculated onto a cell culture plate (Thermo scientific Nuclon Delta Surface 96 well) to prepare 10 plates.
- deuterium sulfuric acid D 2 SO 4
- water H 2 O
- pH 0.8, 1.2, 1.5, 2.3, 2.7, 3.0
- 100 ml of test solutions prepared in 3.3, 3.7, and 4.0 were added. Note that no test solution was added to one of the 10 seeded seeds.
- the cells were cultured in a multi-gas incubator for 24 hours to form a biofilm on the bottom of the plate. After incubation, the plates were washed with distilled water and stained with 0.1% crystal violet solution for 10 minutes. After staining, the samples were washed again with distilled water, dried, and then observed using a bright field inverted microscope and photographs were taken.
- crystal violet was extracted with 100 ⁇ l of 99.5% ethanol (manufactured by Fuji Film Wako Pure Chemical Industries, Ltd.), and absorbance was measured at a wavelength of 590 nm using an absorbance grating microplate reader.
- Streptococcus mutans was diluted with THB containing 2% sucrose, and 100 ⁇ l of the diluted solution was inoculated onto a cell culture plate (Nunclon Delta Surface 96 well, manufactured by Thermo Scientific) to prepare 10 plates. Thereafter, the cells were cultured in a multi-gas incubator for 24 hours to form a biofilm on the bottom of the plate.
- crystal violet was extracted with 100 ⁇ l of 99.5% ethanol (manufactured by Fuji Film Wako Pure Chemical Industries, Ltd.), and absorbance was measured at a wavelength of 590 nm using an absorbance grating microplate reader.
- Streptococcus mutans was diluted with THB containing 2% sucrose, and 100 ⁇ l of the diluted solution was inoculated onto a cell culture plate (Nunclon Delta Surface 96 well, manufactured by Thermo Scientific) to prepare 10 plates. Thereafter, the cells were cultured in a multi-gas incubator for 24 hours to form a biofilm on the bottom of the plate.
- the middle row of Figure 3 is a photograph of the test solution added to the culture medium of Streptococcus mutans in Experiment 2 after 24 hours (after biofilm formation), and the cultured for an additional 24 hours, which was stained and washed.
- the lower part of FIG. 3 is a photograph of the Streptococcus mutans species in Experiment 3 after 24 hours (after biofilm formation), the medium was replaced with the test solution, and the cultured for an additional 24 hours was stained and washed. Looking at these photos, it can be seen that the lower the pH value, the lighter the color, and the more biofilm is destroyed.
- FIG. 4 shows the results of measuring the absorbance of the sample tested in Experiment 1 above.
- the horizontal axis is the pH value
- the vertical axis is the absorbance.
- Table 2 shows the pH and absorbance data for Experiment 1.
- FIG. 5 shows the results of measuring the absorbance of the sample tested in Experiment 2 above.
- the horizontal axis is the pH value
- the vertical axis is the absorbance.
- FIG. 6 shows the results of measuring the absorbance of the sample tested in Experiment 3 above.
- the horizontal axis is the pH value
- the vertical axis is the absorbance.
- the pH value becomes smaller than 2.3
- the absorbance gradually decreases, and a remarkable decreasing trend continues until the pH value reaches 0.5.
- a pH below 2.0 clearly indicates that the biofilm is destroyed.
- Table 4 below provides pH and absorbance data for Experiment 3. [Table 4]
- Streptococcus mutans produces acid using sugar as a nutrient source, its acid-resistant properties are activated by this system so that it can withstand a drop in pH in areas where bacteria are densely populated.
- Streptococcus mutans used in Experiments 1 to 3 has resistance to acidity. It is naturally effective against biofilms produced by biofilm-producing bacteria that do not have such a system.
- Streptococcus mutans has a quorum sensing system that allows it to withstand particularly harsh environments.
- a quorum sensing system is a system that senses the density of bacteria when the number of bacteria exceeds a certain number, signal transmission occurs, and an activity that is favorable for the growth of bacteria occurs. Since Streptococcus mutans produces acid using sugar as a nutritional source, its acid-resistant properties are activated in this system so that it can withstand a drop in pH in areas where the bacteria are densely populated. In addition, it produces bacterions, which are bactericidal substances, and regulates the amount of bacteria in order to stop the growth of bacteria.
- Streptococcus mutans is activated to incorporate genes, making it more likely to mutate so that it can survive in harsh environments. In this way, even if S. mutans is placed in a low pH environment, it is difficult to kill it because it has such a system, and a low pH of 0.5 to 2.0 is required. becomes.
- Fn bacteria Feusobacterium nucleatum
- This bacterium produces butyric acid, which causes bad breath (bad breath), and is thought to be the cause of periodontal disease.
- this bacterium has also been discovered in the large intestine, and is thought to be the cause of colorectal cancer.
- This bacterium does not have a quorum sensing system like Streptococcus Streptococcus mutans, so its acid-fastness is lower than that of Streptococcus Streptococcus mutans, and even biofilm-disrupting solutions with a pH higher than that of Streptococcus Streptococcus mutans can prevent biofilms. Can be destroyed.
- FIG. 7 shows the results of an experiment actually using the Fn strain.
- the medium used was THB (TODD-HEWITT BROTH) supplemented with 2% (w/v) sucrose.
- Sucrose is a sugar in which the monosaccharides glucose and fructose are bonded to ⁇ -1,2-glycoside, and is a type of disaccharide.
- THB manufactured by Becton Dickinson was used.
- As the sucrose "CASRN” manufactured by Fuji Film Wako Pure Chemical Industries, Ltd. was used.
- the plate used for culturing was Thermo scientifica Nunclon Delta Surface 96well.
- the incubator used was a Panasonic multi-gas incubator MCO-5MUV-PJ.
- the culture was performed at 37 degrees Celsius in an atmosphere of 5% CO 2 gas, 5% O 2 gas, and 90% N 2 gas.
- Fn bacteria was diluted with THB containing 2% sucrose, and 100 ⁇ l of the diluted solution was inoculated onto a cell culture plate (Thermo scientifica Nunclon Delta Surface 96 well) to prepare 10 pieces.
- 100 ml of the prepared test solution was added. Note that no test solution was added to one of the seven seeded seeds.
- the cells were cultured in a multi-gas incubator for 24 hours to form a biofilm on the bottom of the plate. After incubation, the plates were washed with distilled water and stained with 0.1% crystal violet solution for 10 minutes. After dyeing, it was washed again with distilled water and dried.
- crystal violet was extracted with 100 ⁇ l of 99.5% ethanol (manufactured by Fuji Film Wako Pure Chemical Industries, Ltd.), and absorbance was measured at a wavelength of 590 nm using an absorbance grating microplate reader.
- FIG. 7 shows the results of measuring the absorbance of the sample tested in Experiment 4 above.
- the horizontal axis is the pH value
- the vertical axis is the absorbance.
- the pH value is lower than 4.5
- the absorbance is lower than when the pH is 6.0, making it difficult to form a biofilm.
- Table 5 below provides pH and absorbance data for Experiment 4. [Table 5]
- a biofilm-disrupting solution with a pH adjusted to 0.5 to 2.0 is preferable for highly acid-fast bacteria such as S. mutans, and is effective against Fn bacteria.
- highly acid-fast bacteria such as S. mutans
- the solution for destroying biofilms of the present invention has the ability to strongly destroy biofilms, it can be used not only for treating biofilms that occur in the environment, but also in the dental and medical fields. Furthermore, biofilms formed on medical devices used in the medical field can be destroyed, allowing for more precise cleaning.
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Abstract
Description
特許文献2に記載の発明は、嚢胞性線維症患者におけるバイオフィルムの破壊方法に関するもので、単離されたかまたは組換え型の組込み宿主因子(IHF)ポリペプチド、またはそのそれぞれの断片もしくは等価物を用いている。
この発明の目的は、人体にやさしく、バイオフィルムを効果的に破壊する溶液とその製造方法を提供することである。
本発明の殺菌用溶液は、水(H2O)を用いて重水素硫酸(D2SO4)のpHを調製して作られたものである。重水素硫酸(D2SO4)は、Cambridge Isotope Laboratories, Inc.製のものを用いた。水(H2O)は、水道水を用いた。本発明のバイオフィルムを破壊するための溶液は、これら2つの物質から構成されるものであるが、pH値に影響を与えない、若しくは影響が少ない微量成分を添加してもよい。pHの測定は、堀場製作所製のモデルMETRO-51を用いた。
実際の細胞外多糖類(EPS)の代わりの多糖類として、水あめと植物性ゼリーを用いて、多糖類が本発明によってどのように分解されるのかを調べるための予備試験を行った。水あめは、加藤産業株式会社製のもの(商品名「Kanpy 水あめ」)を用い、植物性ゼリーは、COOP製(製造者:伊那食品工業株式会社)のもの(商品名「コープアガー」)を用いた。
撮影に用いた顕微鏡は、Life technologies社製のEVOS XL coreを用いた。吸光度測定器は、CORONA ELECTRIC社SH-1000 Labを用いた。データ処理ソフトウェアは「SF6」とし、吸光度波長は、590nmとした。
ストレプトコッカス・ミュータンス菌を2%スクロース含有THBで希釈し、細胞培養用プレート(Thermo scientificshaNunclon Delta Surface 96well)に100μl播種したものを10個用意した。播種と同時に、重水素硫酸(D2SO4)を水(H2O)で希釈し、pH=0.8、1.2、1.5、2.3、2.7、3.0、3.3、3.7、4.0に調製した試験液100mlを添加した。なお、播種した10個のうち1個については、試験液は添加しなかった。
ストレプトコッカス・ミュータンス菌を2%スクロース含有THBで希釈し、細胞培養用プレート(Thermo scientific社Nunclon Delta Surface 96well)に100μl播種したものを10個用意した。その後、マルチガスインキュベーターで24時間培養してプレート底面にバイオフィルムを形成させた。
ストレプトコッカス・ミュータンス菌を2%スクロース含有THBで希釈し、細胞培養用プレート(Thermo scientific社Nunclon Delta Surface 96well)に100μl播種したものを10個用意した。その後、マルチガスインキュベーターで24時間培養してプレート底面にバイオフィルムを形成させた。
[表2]
[表3]
[表4]
ミュータンス菌は、糖を栄養源として酸を産生することから、菌の密集した局所でpH低下に耐えられるように耐酸性の性質がこのシステムで活性化される。また、菌の増殖に歯止めがかけられるように殺菌物質であるバクテリオンを産生し、菌量の調節を行う。
ミュータンス菌は、環境に適応するために遺伝子の取り込みが活性化され、厳しい環境でも生息できる性質を持つように変異しやすくする。
このように、ミュータンス菌では、低pH環境におかれても、このようなシステムを有しているため死滅させることが困難となり、pHが0.5以上2.0以下という低いpHが必要となる。
この菌は、ミュータンス菌のようなクオラムセンシングシステムを有さないので、抗酸性はミュータンス菌よりも低く、pHがミュータンス菌と比べて高いpHを有するバイオフィルム破壊液でもバイオフィルムを破壊することができる。
Fn菌を2%スクロース含有THBで希釈し、細胞培養用プレート(Thermo scientificshaNunclon Delta Surface 96well)に100μl播種したものを10個用意した。播種と同時に、重水素硫酸(D2SO4)を水(H2O)で希釈し、pH=0.5、2.0、3.0、4.0、5.0、6.0に調製した試験液100mlを添加した。なお、播種した7個のうち1個については、試験液は添加しなかった。
[表5]
Claims (3)
- 水(H2O)と重水素硫酸(D2SO4)からなり、pHが0.5以上4.0以下の、バイオフィルムを破壊するための溶液。
- 水(H2O)を用いて重水素硫酸(D2SO4)を希釈して、水(H2O)と重水素硫酸(D2SO4)からなり、pHが0.5以上4.0以下の、バイオフィルムを破壊するための溶液を製造する方法。
- 請求項1のバイオフィルムを破壊するための溶液を用いて、バイオフィルムを産生する菌の種類によって、pHを調整してバイオフィルムを破壊する方法。
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WO2008065734A1 (fr) * | 2006-11-27 | 2008-06-05 | Oct Incorporated | Composition aqueuse |
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WO2011134010A1 (en) * | 2010-04-28 | 2011-11-03 | The University Of Queensland | Control of bacterial activity, such as in sewers and wastewater treatment systems |
JP2014100700A (ja) * | 2012-10-23 | 2014-06-05 | Okuto:Kk | 汚染土壌の除染方法 |
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JP2020037595A (ja) | 2013-06-13 | 2020-03-12 | リサーチ インスティチュート アット ネイションワイド チルドレンズ ホスピタル | Burkholderia感染の処置のための組成物および方法 |
JP2021165284A (ja) | 2020-01-07 | 2021-10-14 | ロート製薬株式会社 | アクネ菌バイオフィルム破壊組成物 |
JP6966818B1 (ja) * | 2021-04-30 | 2021-11-17 | 株式会社オクト | 殺菌用水溶液の製造方法 |
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WO2008065734A1 (fr) * | 2006-11-27 | 2008-06-05 | Oct Incorporated | Composition aqueuse |
WO2010004699A1 (ja) | 2008-07-09 | 2010-01-14 | 野口歯科医学研究所株式会社 | 口臭抑制剤及びその生成方法 |
WO2011134010A1 (en) * | 2010-04-28 | 2011-11-03 | The University Of Queensland | Control of bacterial activity, such as in sewers and wastewater treatment systems |
JP2014100700A (ja) * | 2012-10-23 | 2014-06-05 | Okuto:Kk | 汚染土壌の除染方法 |
JP2020037595A (ja) | 2013-06-13 | 2020-03-12 | リサーチ インスティチュート アット ネイションワイド チルドレンズ ホスピタル | Burkholderia感染の処置のための組成物および方法 |
JP2016013520A (ja) * | 2014-07-02 | 2016-01-28 | 株式会社オクト | 飲料水 |
JP2021165284A (ja) | 2020-01-07 | 2021-10-14 | ロート製薬株式会社 | アクネ菌バイオフィルム破壊組成物 |
JP6966818B1 (ja) * | 2021-04-30 | 2021-11-17 | 株式会社オクト | 殺菌用水溶液の製造方法 |
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