Chlorophyll-containing composition

Abstract

To provide a liquid composition that is less prone to aggregation even during long-term storage, the liquid composition comprising a chlorophyll, a polyphenol, and organic solvent.SOLUTION: The present invention provides a liquid composition that is less prone to aggregation even during long-term storage, the liquid composition comprising a chlorophyll, a polyphenol, organic solvent, and a polyvinyl acetal resin.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a composition containing chlorophylls. [Background technology]

[0002] Natural coloring agents are pigments extracted from plants and other sources, and are used in foods, cosmetics, dyes, etc. because of their unique natural colors and the image of being gentler on the body and the environment than synthetic coloring agents. Among natural coloring agents, chlorophyll is a natural green pigment found in plants and algae, extracted from spinach and chlorella, and used in foods such as gum and candy, as well as in dyes. Cited Document 1 describes a method for extracting an extract containing chlorophyll from bamboo leaves. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2000-69946 Summary of the Invention [Problem to be solved by the invention]

[0004] The inventors have found through their research that liquid compositions containing chlorophylls, polyphenols, and organic solvents tend to aggregate when stored for long periods of time, and that when the liquid composition is applied to a filter or the like, it is difficult to apply the chlorophylls and polyphenols uniformly. Therefore, an object of the present invention is to provide a liquid composition containing chlorophylls, polyphenols, and an organic solvent, which is inhibited from causing aggregation even when stored for a long period of time. [Means for solving the problem]

[0005] As a result of extensive research, the present inventors have completed the present invention as described below.

[0006] [1] A liquid composition comprising chlorophylls, polyphenols, an organic solvent, and a polyvinyl acetal resin. [2] The liquid composition according to claim 1, wherein the water content is 5% by mass or less. [3] The liquid composition according to [1] or [2], wherein the chlorophylls are copper chlorophylls. [4] The liquid composition according to any one of [1] to [3], wherein the polyphenols are catechins. [5] The liquid composition according to any one of [1] to [4], wherein the organic solvent is an alcohol. [6] The liquid composition according to any one of [1] to [5], containing 0.01% by mass to 10% by mass of the chlorophylls, 0.01% by mass to 10% by mass of total polyphenols, and 0.01% by mass to 10% by mass of the polyvinyl acetal resin. [7] The liquid composition according to any one of [1] to [6], wherein the polyvinyl acetal resin is a polyvinyl butyral resin. [8] A method for producing a filter, comprising a step of applying the liquid composition according to any one of [1] to [7]. [9] A powder for a liquid composition comprising copper chlorophyll, catechins, and a polyvinyl acetal resin. [Effects of the Invention]

[0007] According to the present invention, a liquid composition is provided in which the occurrence of aggregation is suppressed even during long-term storage by incorporating a polyvinyl acetal resin into chlorophylls, polyphenols, and an organic solvent. DETAILED DESCRIPTION OF THE INVENTION

[0008] The present invention will be described below.

[0009] [Chlorophylls] Examples of chlorophylls according to the present embodiment include chlorophylls such as chlorophyll a or chlorophyll b; chlorophyll decomposition products such as chlorophyllin, pheophytin, and chlorophyllide; chlorophylls substituted with central metals such as copper chlorophyll, iron chlorophyll, and zinc chlorophyll; alkali salts of chlorophyllin such as copper chlorophyllin Na, iron chlorophyllin Na, and zinc chlorophyllin Na; and other chlorophyll derivatives, with copper chlorophylls being preferred.

[0010] [Polyphenols] Examples of polyphenols according to this embodiment include primary polyphenols such as catechins and proanthocyanidins, and secondary polyphenols such as theasinensins, oolong theanine, theaflavins, and thearubigins, which are products of their oxidative polymerization. Catechins are preferred, and tea catechins contained in tea leaves are preferred. Examples of tea catechins include catechin, epicatechin (EC), epigallocatechin (EGC), gallocatechin (GC), and gallate-type epicatechin gallate (ECg), epigallocatechin gallate (EGCg), gallocatechin gallate (GCg), catechin gallate (Cg), polymerized catechins, and other catechins.

[0011] [Method for producing chlorophylls and polyphenols] The method for producing chlorophylls and polyphenols is not particularly limited, but examples thereof include a method in which a mixed liquid containing tea leaves and a solvent is heated to extract chlorophylls and polyphenols into the solvent.

[0012] The extraction step includes a step of separating the extract from which chlorophylls and polyphenols have been extracted and the tea leaves from which chlorophylls and polyphenols have been extracted. In the tea leaf separation step, the specific method is not limited as long as it can separate the tea leaves (solid content) from the extract containing chlorophylls and polyphenols, and a filter, metal mesh (wire netting), or the like may be used. This allows the extraction of an extract containing chlorophylls and polyphenols. The separation in this step is preferably carried out under heating, for example, at 70°C or higher. This increases the amount of polyphenols extracted and enables efficient separation of the tea leaf residue and the extract.

[0013] The tea leaves in the extraction step may be used without being crushed, or may have been crushed in advance. The crushing process may be dry crushing or wet crushing. For dry crushing, a dry crusher such as a cutter mill or a ball mill may be used. The solvent extraction in this step is carried out, for example, at a temperature of 50°C or higher and 100°C or lower, more preferably 70°C or higher and 100°C or lower. This allows for efficient extraction of chlorophylls and polyphenols. The weight of the solvent in the mixed liquid may be 2 to 30 times the weight of the tea leaves. This allows for sufficient extraction of the chlorophylls and polyphenols in the tea leaves into the solvent.

[0014] The solvent used for extraction is not particularly limited, but is preferably water or alcohol, and may be, for example, a mixed solvent of water and alcohol (hydroalcohol). Water may be any water, such as pure water, ultrapure water, demineralized water, sterilized water, distilled water, or tap water. Water may also be a buffer solution, physiological saline, dilute acid, or dilute alkali. Alcohols include monohydric alcohols and polyhydric alcohols (e.g., dihydric alcohols or trihydric or higher alcohols). Examples of monohydric alcohols include ethanol, methanol, propyl alcohol, butyl alcohol, isobutyl alcohol, and benzyl alcohol. Examples of polyhydric alcohols include 1,3-butylene glycol, ethylene glycol, propylene glycol, and glycerin.

[0015] The tea leaves used in the extraction step broadly refer to tea plant tissues containing chlorophylls and polyphenols as the active ingredients of tea, and are not limited to "leaves," but also include "stems," etc. Furthermore, the tea leaves according to this embodiment may be fresh tea leaves after plucking, or tea leaves that have been heat-treated, refrigerated, or frozen after plucking. Furthermore, the tea leaves may be cut or crushed, and their shape is not particularly limited. Furthermore, the tea leaves used in the extraction step may be used tea leaves left after extracting a tea-based beverage. Used tea leaves contain chlorophylls and catechins, just like tea leaves. Resource conservation can be achieved by effectively utilizing the used tea leaves that are generated in large quantities during the production of tea-based beverages rather than discarding them, and extracting the remaining chlorophylls.

[0016] A central metal substitution treatment can be performed to replace the central metal (magnesium) of chlorophylls with copper, iron, or zinc ions. The method for this central metal substitution treatment is not particularly limited, as long as it can replace the central metal of chlorophylls with copper, iron, or zinc ions. For example, copper can be substituted by reacting chlorophylls with copper sulfate pentahydrate. The chlorophylls to be subjected to the central metal substitution treatment can be water-soluble chlorophylls (e.g., chlorophyllin) after alkalization treatment, or insoluble chlorophylls contained in tea leaves. This method can produce chlorophylls that are more stable than unstable chlorophylls and exhibit a vivid blue-green color, such as copper chlorophylls, iron chlorophylls, zinc chlorophylls, copper chlorophyllin sodium, iron chlorophyllin sodium, or zinc chlorophyllin sodium.

[0017] Known organic and inorganic salts can be used as the metal salt used in the central metal substitution treatment. Specifically, chlorides, sulfates, acetylacetonates, formates, nitrates, lactates, acetates, and hydrates thereof can be used. The metal salt concentration may be, for example, 0.1 to 25 wt %, and preferably 2.5 to 10 wt %, based on the total amount of tea leaves before solvent extraction. The temperature during the central metal substitution reaction may be, for example, 70°C to 100°C. The time for the central metal substitution treatment may be, for example, 0.5 to 8 hours, and preferably 1 to 3 hours. Under these conditions, the central metal substitution treatment of chlorophylls can be performed while suppressing discoloration of the chlorophylls, resulting in chlorophylls with good color development.

[0018] The extract containing polyphenols and chlorophylls may be dried. The drying method in this step is not particularly limited, but may be performed by freeze-drying, spray-drying, or the like. By drying the solution containing chlorophylls, a powder containing chlorophylls and polyphenols can be produced. Furthermore, the powder can be purified as needed.

[0019] The chlorophylls contained in the liquid composition of the present invention are preferably 0.01% by mass to 10% by mass, more preferably 0.1% by mass to 5% by mass, and particularly preferably 0.15% by mass to 3% by mass, from the viewpoints of suppressing aggregation of the liquid composition and enabling the filter to exhibit antibacterial, deodorizing, and antiviral properties when the liquid composition is applied to a filter. The total amount of polyphenols contained in the liquid composition of the present invention is preferably 0.01% by mass to 10% by mass, more preferably 0.1% by mass to 8% by mass, and particularly preferably 0.2% by mass to 5% by mass, from the viewpoint of suppressing aggregation of the liquid composition while allowing the filter to exhibit antibacterial, deodorizing, and antiviral properties when the liquid composition is applied to a filter.

[0020] [Polyvinyl acetal resin] As the polyvinyl acetal resin, polyvinyl butyral resin (hereinafter sometimes simply referred to as butyral resin) obtained by acetalizing polyvinyl alcohol resin with butylaldehyde, and polyvinyl formal resin (vinylon) obtained by acetalizing polyvinyl alcohol resin with formaldehyde can be preferably used, and polyvinyl butyral resin is particularly preferred.

[0021] The upper limit of the weight average molecular weight (Mw) of the polyvinyl acetal resin is not particularly limited, but may be, for example, 150,000 or less, or may be 100,000 or less, preferably 50,000 or less, and more preferably 30,000 or less.

[0022] On the other hand, the weight-average molecular weight (Mw) of the polyvinyl acetal resin is preferably at least 5000, more preferably at least 10000. This prevents aggregation of the liquid composition of the present invention, and allows the polyvinyl acetal resin to have good adhesion to the filter and excellent chemical resistance.

[0023] The weight average molecular weight of the polyester resin is determined by measuring the average molecular weight in terms of polystyrene by gel permeation chromatography analysis.

[0024] Commercially available polyvinyl butyral resins include, for example, S-LEC B series "BL-2H," "BL-10," "BL-S," "BM-1," "BM-2," "MN-6," and "BX-L" manufactured by Sekisui Chemical Co., Ltd., and Mobital B series "16H," "20H," "30T," "30H," "30HH," "45M," and "45H" manufactured by Kuraray Co., Ltd. These may be used alone or in combination of two or more.

[0025] The content of the polyvinyl acetal resin in the liquid composition of the present invention is preferably 0.01 to 10% by mass, more preferably 0.1 to 8% by mass, and particularly preferably 0.4 to 5% by mass. Furthermore, the content of the polyvinyl acetal resin in the liquid composition of the present invention is preferably 0.1 to 10 parts by mass, more preferably 0.5 to 5 parts by mass, and particularly preferably 1 to 3 parts by mass, per part by mass of chlorophylls contained in the liquid composition of the present invention.

[0026] By incorporating polyvinyl acetal resin into chlorophylls, polyphenols, and an organic solvent, a liquid composition can be obtained in which aggregation is suppressed even during long-term storage. Although the details of the mechanism are not clear, it is presumed that aggregation of particles containing chlorophylls and polyphenols is suppressed by the appropriate adsorption of chlorophylls and polyphenols to the polyvinyl acetal resin, and by the steric hindrance between the polyvinyl acetal resins and repulsion due to electric charge.

[0027] [solvent] Examples of the solvent include organic solvents, such as alcohol solvents such as methanol, ethanol, n-propanol, isopropanol, n-butanol, isobutanol, sec-butanol, tert-butanol, n-pentanol, isopentanol, phenylethyl alcohol, capryl alcohol, lauryl alcohol, and myristyl alcohol; and glycol ethers such as methyl cellosolve, ethyl cellosolve, ethylene glycol dimethyl ether, ethylene glycol diethyl ether, propylene glycol monomethyl ether, propylene glycol monoethyl ether, propylene glycol monopropyl ether, propylene glycol dimethyl ether, propylene glycol diethyl ether, ethylene glycol monobutyl ether, diethylene glycol monobutyl ether, triethylene glycol monobutyl ether, tetraethylene glycol monobutyl ether, and dipropylene glycol monobutyl ether. ether solvents such as tetrahydrofuran, dioxane, diisopropyl ether, and di-n-butyl ether; ketone solvents such as acetone, methyl ethyl ketone, and methyl isobutyl ketone; ester solvents such as methyl acetate, ethyl acetate, n-propyl acetate, isopropyl acetate, n-butyl acetate, isobutyl acetate, n-amyl acetate, isoamyl acetate, hexyl acetate, ethyl propionate, and butyl propionate; hydrophilic solvents such as 10% denatonium benzoate alcohol solution, geraniol, octaacetylated sucrose, brucine, linalool, linalyl acetate, and acetic acid; and alcohol solvents are preferred, and examples of alcohol solvents include monohydric alcohols and polyhydric alcohols (e.g., dihydric alcohols, or trihydric or higher alcohols).

[0028] The content of the solvent in the liquid composition is not particularly limited, but the amount of the solvent is preferably 5 to 200 parts by mass, more preferably 8 to 100 parts by mass, relative to the total mass of the chlorophylls, polyphenols, and polyvinyl acetal resin in the liquid composition. The solid content of the composition is preferably adjusted to 0.01 to 80% by mass, more preferably 0.1 to 30% by mass, and even more preferably 1.0 to 20.0% by mass. The solvent may be used alone or in combination of two or more. When two or more solvents are used in combination, the total content is preferably within the above range.

[0029] From the viewpoint of suppressing aggregation of the liquid composition, the content of water in the liquid composition is preferably 5% by mass or less, more preferably 3% by mass or less, more preferably 1% by mass or less, and more preferably 0.5% by mass or less, relative to the mass of the liquid composition.

[0030] [Ingredients derived from tea leaves] The liquid composition of the present invention may contain ingredients derived from tea leaves, such as caffeine, theanine, flavonols, complex polysaccharides, ascorbic acid, γ-aminobutyric acid, saponin, vitamin B2, dietary fiber, and minerals.

[0031] [Chlorophyll measurement] Chlorophyll is measured using copper chlorophyll (Chloron GA, manufactured by Nippon Chlorophyll) as a standard solution and calculated as the amount of copper chlorophyll. 20 mg of sample is diluted to 100 mL with acetone, and the absorbance is measured at 410 nm using a UV-visible spectrophotometer (Hitachi U4100 spectrophotometer). The amount of chlorophyll is calculated from the calibration curve using Chloron GA.

[0032] [Measurement of total polyphenols] The total polyphenol content is measured using the ferrous tartrate method, using ethyl gallate as the standard solution, and is calculated as the equivalent amount of gallic acid (Reference: "Green Tea Polyphenols," Effective Utilization Technology Series for Functional Ingredients in Food and Beverages, No. 10). 5 mL of sample is colored with 5 mL of ferrous tartrate standard solution, then dissolved to a constant volume of 25 mL with phosphate buffer. The absorbance is measured at 540 nm using a UV-visible spectrophotometer (Hitachi U4100 spectrophotometer), and the total polyphenol content is calculated from a calibration curve using ethyl gallate. Preparation of ferrous tartrate standard solution: 100 mg of ferrous sulfate heptahydrate, 500 mg of sodium potassium tartrate (Rochelle salt), and distilled water to make 100 mL. Preparation of phosphate buffer: Mix 1 / 15 M disodium hydrogen phosphate solution and 1 / 15 M sodium dihydrogen phosphate solution and adjust to pH 7.5.

[0033] Filter The liquid composition of the present invention can be applied to a fiber structure constituting a filter, and then dried to fix chlorophylls and polyphenols to the fiber structure, thereby obtaining a filter with deodorizing, antibacterial, and antiviral properties.

[0034] The material of the fiber structure constituting the filter may be any material, but nonwoven fabric, paper, or a composite of these is preferred. Nonwoven fabric is particularly preferred from the viewpoint of deodorizing performance. Examples of fibers constituting these fiber structures include synthetic resin fibers, inorganic fibers, and natural pulp.

[0035] Specific examples of nonwoven fabrics include those produced by direct fabric-making methods such as spunbonding, meltblowing, centrifugal force, flash spinning, high-voltage dry spinning, and film methods; dry methods such as air-laying, carding, and garnet machine (recycle machine) methods; and wet methods similar to papermaking. Methods for bonding fibers include adhesive methods, heat fusion methods, ultrasonic bonding, needle punching, spunlace methods, and stitch bond methods.

[0036] Specific examples of paper include thin paper (e.g., tissue paper, toilet paper, napkins, towel paper), wrapping paper, coated paper (e.g., art paper, coated paper), uncoated paper, printing paper, drawing paper, laminated paper, and Japanese paper, as well as cardboard structure paper, honeycomb structure paper, white cardboard, straw cardboard, chipboard, corrugated paper, and paperboard such as banknote base paper and backing paper.

[0037] Specific examples of synthetic resin fibers include polypropylene fibers, polyethylene fibers, polyethylene terephthalate fibers, polyvinyl chloride fibers, and polystyrene fibers.

[0038] Specific examples of inorganic fibers include alumina fibers, activated carbon fibers, carbon fibers, glass fibers, zirconia fibers, and alumina-silica fibers.

[0039] Specific examples of natural pulp include wood pulp, bast fiber, reed pulp, bagasse pulp, straw pulp, and bamboo pulp.

[0040] In addition to nonwoven fabrics and paper, molded products such as films and sheets made of resin, metal, activated carbon, etc. can also be used.

[0041] Any appropriate method can be used to apply the liquid composition of the present invention to a filter, including, for example, spin coating, roll coating, flow coating, inkjet coating, spray coating, printing, dip coating, film casting, bar coating, and gravure printing, with dip coating being preferred. [Example]

[0042] The present invention will be described in more detail below based on examples, but the present invention is not limited to these examples.

[0043] (Production of powder containing chlorophylls and polyphenols) 10 parts by mass of tea leaves, 80 parts by mass of methanol, and 10 parts by mass of water were mixed at 90°C for 3 hours, and then Solid-liquid separation was then performed. Next, 5 parts by mass of copper sulfate was added to 100 parts by mass of the solvent and mixed at 90°C for 3 hours to carry out a central metal substitution reaction of the chlorophyllin compound, followed by solid-liquid separation. The resulting liquid was concentrated to dryness and then vacuum-dried to obtain a powder derived from the tea leaf extract (copper chlorophyll: 25% by mass, total polyphenol content: 40% by mass).

[0044] [Example 1] The powder and polyvinyl acetal resin were mixed with ethanol to obtain a liquid composition containing 0.2% by mass of copper chlorophyll, 0.3% by mass of total polyphenols, and 0.5% by mass of polyvinyl acetal resin (X) (Sekisui Chemical Co., Ltd., S-LEC BL-1, molecular weight: 19,000, hydroxyl groups: 26% by mass, acetyl groups: 4% by mass or less, degree of acetalization: approximately 73% by mass, glass transition temperature: 70°C, polyvinyl butyral resin).

[0045] [Example 2] A liquid composition was obtained in the same manner as in Example 1, except that the powder and polyvinyl acetal resin were mixed with ethanol so that the copper chlorophyll content was 1.5% by mass, the total polyphenol content was 2.4% by mass, and the polyvinyl acetal resin (X) content was 2.5% by mass.

[0046] [Example 3] A liquid composition was obtained in the same manner as in Example 1, except that the powder and polyvinyl acetal resin were mixed with ethanol so that the copper chlorophyll content was 2.5% by mass, the total polyphenol content was 4.0% by mass, and the polyvinyl acetal resin (X) content was 4.0% by mass.

[0047] [Example 4] A liquid composition was obtained by mixing copper chlorophyll (Chloron GA, manufactured by Nippon Chlorophyll) 0.2% by mass, epigallocatechin gallate (Green Tea Extract, manufactured by Skyherb) with a total polyphenol content of 0.3% by mass, and polyvinyl acetal resin (X) (SLEX BL-1, polyvinyl butyral resin, manufactured by Sekisui Chemical Co., Ltd.) 0.5% by mass with ethanol.

[0048] [Example 5] A liquid composition was obtained in the same manner as in Example 4, except that copper chlorophyll was 1.5% by mass, epigallocatechin gallate was mixed with ethanol so that the total polyphenol content was 2.4% by mass, and polyvinyl acetal resin (X) was 2.5% by mass.

[0049] [Example 6] A liquid composition was obtained in the same manner as in Example 4, except that 2.5% by mass of copper chlorophyll and epigallocatechin gallate were mixed with ethanol so that the total polyphenol content was 4.0% by mass and the polyvinyl acetal resin (X) was 4.0% by mass.

[0050] [Example 7] A liquid composition was obtained in the same manner as in Example 4, except that copper chlorophyllin Na (Chloron G, manufactured by Nippon Chlorophyll) was used instead of copper chlorophyll.

[0051] [Example 8] A liquid composition was obtained in the same manner as in Example 5, except that copper chlorophyllin Na (Chloron G, manufactured by Nippon Chlorophyll) was used instead of copper chlorophyll.

[0052] [Example 9] A liquid composition was obtained in the same manner as in Example 6, except that copper chlorophyllin Na (Chloron G, manufactured by Nippon Chlorophyll) was used instead of copper chlorophyll.

[0053] [Example 10] The powder and the polyvinyl acetal resin were mixed with ethanol to obtain a liquid composition containing 0.2% by mass of copper chlorophyll, 0.3% by mass of total polyphenols, and 0.5% by mass of polyvinyl acetal resin (Y) (manufactured by Kuraray Co., Ltd., Mobital B30HH, hydroxyl groups: 18-21% by mass, acetyl groups: 1-4% by mass, polyvinyl butyral resin).

[0054] [Example 11] A liquid composition was obtained in the same manner as in Example 10, except that the powder and the polyvinyl acetal resin were mixed with ethanol so that the copper chlorophyll content was 1.5% by mass, the total polyphenol content was 2.4% by mass, and the polyvinyl acetal resin (Y) content was 2.5% by mass.

[0055] [Example 12] A liquid composition was obtained in the same manner as in Example 10, except that the powder and the polyvinyl acetal resin were mixed with ethanol so that the copper chlorophyll content was 2.5% by mass, the total polyphenol content was 4.0% by mass, and the polyvinyl acetal resin (Y) content was 4.0% by mass.

[0056] [Example 13] Copper chlorophyll (Chloron GA, manufactured by Nippon Chlorophyll) 0.2% by mass, epigallocatechin gallate (Green Tea Extract, manufactured by Skyherb) with a total polyphenol content of 0.3% by mass, and polyvinyl acetal resin (Y) (Mobital B30HH, polyvinyl butyral resin, manufactured by Kuraray Co., Ltd.) 0.5% by mass were mixed with ethanol to obtain a liquid composition.

[0057] [Example 14] A liquid composition was obtained in the same manner as in Example 13, except that copper chlorophyll was mixed with ethanol to give a total polyphenol content of 1.5% by mass, epigallocatechin gallate to give a total polyphenol content of 2.4% by mass, and polyvinyl acetal resin (Y) to give a total polyphenol content of 2.5% by mass.

[0058] [Example 15] A liquid composition was obtained in the same manner as in Example 13, except that copper chlorophyll was 2.5% by mass, epigallocatechin gallate was mixed with ethanol so that the total polyphenol content was 4.0% by mass, and polyvinyl acetal resin (Y) was 4.0% by mass.

[0059] [Example 16] A liquid composition was obtained in the same manner as in Example 13, except that copper chlorophyllin Na (Chloron G, manufactured by Nippon Chlorophyll) was used instead of copper chlorophyll.

[0060] [Example 17] A liquid composition was obtained in the same manner as in Example 14, except that copper chlorophyllin Na (Chloron G, manufactured by Nippon Chlorophyll) was used instead of copper chlorophyll.

[0061] [Example 18] A liquid composition was obtained in the same manner as in Example 15, except that copper chlorophyllin Na (Chloron G, manufactured by Nippon Chlorophyll) was used instead of copper chlorophyll.

[0062] [Comparative Example 1] A liquid composition was obtained in the same manner as in Example 2, except that the polyvinyl acetal resin was not mixed.

[0063] Comparative Example 2 A liquid composition was obtained in the same manner as in Example 5, except that the polyvinyl acetal resin was not added.

[0064] Comparative Example 3 A liquid composition was obtained in the same manner as in Example 2, except that the polyvinyl acetal resin was changed to an acrylic resin (R-3380-E, manufactured by DIC Corporation).

[0065] Comparative Example 4 A liquid composition was obtained in the same manner as in Example 5, except that the polyvinyl acetal resin was changed to an acrylic resin (R-3380-E, manufactured by DIC Corporation).

[0066] <Stability evaluation of liquid compositions> The liquid compositions of the Examples and Comparative Examples were placed in glass containers, sealed, and then stored in a thermostatic chamber at 25°C for one month. After one month had passed, the liquid compositions were visually inspected for the occurrence of aggregation or sedimentation. If no aggregation or sedimentation occurred in the liquid compositions, they were rated as A, and if aggregation or sedimentation occurred, they were rated as B.

[0067] [Table 1]

[0068] As described above, in the Examples, a liquid composition containing chlorophylls, polyphenols, and an organic solvent was obtained in which the occurrence of aggregation was suppressed even after long-term storage.

[0069] <Production and evaluation of deodorizing, antibacterial, and antiviral filters> The liquid composition of Example 1 was dip-coated onto a nonwoven fabric made of polyester fibers and then dried to produce a filter. The produced filter was used to conduct a deodorizing test, an antibacterial test, and an antiviral test. In the deodorizing test, the filter exhibited a deodorizing effect against malodors (ammonia, hydrogen sulfide, methyl mercaptan, and trimethylamine). In the antibacterial test, the filter exhibited an antibacterial effect against Escherichia coli. In the antiviral test, the filter exhibited good antiviral properties against influenza A.

Claims

1. A liquid composition comprising chlorophylls, polyphenols, an alcohol, and a polyvinyl acetal resin, characterized in that the liquid composition contains 0.01% by mass to 10% by mass of the chlorophylls, 0.01% by mass to 10% by mass of the total amount of polyphenols in the polyphenols, and 0.01% by mass to 10% by mass of the polyvinyl acetal resin.

2. 2. The liquid composition according to claim 1, wherein the water content is 5% by mass or less.

3. 3. The liquid composition according to claim 1, wherein the chlorophylls are copper chlorophylls.

4. The liquid composition according to any one of claims 1 to 3, wherein the polyphenols are catechins.

5. The liquid composition according to any one of claims 1 to 4, wherein the polyvinyl acetal resin is a polyvinyl butyral resin.

6. A method for producing a filter, comprising the step of applying the liquid composition according to any one of claims 1 to 5.

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