Aqueous solution of water-soluble organic solvent containing fat and oil powder and dietary fiber

Abstract

An object of the present invention is to provide a solution capable of producing a film having a water-repellent effect, a method for producing the solution, a film having a water-repellent effect, and an edible film having a water-repellent effect.SOLUTION: A water-containing solution of a water-soluble organic solvent comprising the following membrane raw material (1) and membrane raw material (2), wherein the content of the membrane raw material (1) in the water-containing solution of a water-soluble organic solvent is 0.5 to 30% by mass, the content of the membrane raw material (2) is 0.1 to 5% by mass, and the content of the water-soluble organic solvent is 8 to 75% by mass: The film raw material (1) is an oil and fat powder film raw material (2) having a melting point of ≥ 55 °C. Dietary fiber SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a water-soluble organic solvent solution containing a fat or oil powder and dietary fiber, a method for producing the same, and a membrane using the water-soluble organic solvent solution. [Background technology]

[0002] Edible films made of edible materials (gelatin, starch, agar, etc.) have the property of being easily soluble in water. Therefore, when an edible film is used as a food packaging material for packaging food, the food packaging material is easily dissolved and removed when water is added to the food packaged in the food packaging material made of an edible film or when the food is placed in the mouth (see Patent Document 1). Furthermore, in order to improve the flexibility and cold water solubility of edible films, hydroxypropylated starch has been used as a raw material and an edible film has also been developed (see Patent Document 2). As such, edible films made from edible materials (gelatin, starch, agar, etc.) are easily dissolved in water, so to date, there have been very few edible films developed that have the opposite property of water-repellent properties. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2014-168419 [Patent Document 2] Japanese Patent Application Laid-Open No. 2000-342193 Summary of the Invention [Problem to be solved by the invention]

[0004] An object of the present invention is to provide a solution capable of producing a film having a water-repellent effect, and a method for producing the solution. Another object of the present invention is to provide a film having a water-repellent effect and an edible film having a water-repellent effect. [Means for solving the problem]

[0005] As a result of extensive research into solving the above problems, the present inventors have found that a film having a water-repellent effect can be produced by using a water-containing solution of a water-soluble organic solvent produced using a specific oil or fat powder, dietary fiber, water, and a water-soluble organic solvent, and have thus completed the present invention.

[0006] That is, the present invention relates to the following. [1] A water-soluble organic solvent aqueous solution containing the following membrane raw materials (1) and (2), wherein the content of the membrane raw material (1) in the water-soluble organic solvent aqueous solution is 0.5 to 30 mass%, the content of the membrane raw material (2) is 0.1 to 5 mass%, and the content of the water-soluble organic solvent is 8 to 75 mass%. Film material (1): Oil powder with a melting point of 55°C or higher Membrane ingredient (2): Dietary fiber [2] The aqueous solution of a water-soluble organic solvent according to [1], wherein the oil or fat powder of the membrane raw material (1) has an average particle size of 200 μm or less. [3] The aqueous solution of a water-soluble organic solvent according to [1] or [2], wherein the content of the membrane raw material (1) in the aqueous solution of the water-soluble organic solvent is 1 to 15 mass %. [4] The aqueous solution of a water-soluble organic solvent according to any one of [1] to [3], wherein the amount of the membrane raw material (2) in the aqueous solution of the water-soluble organic solvent is 0.2 to 3 mass %. [5] The aqueous solution of a water-soluble organic solvent according to any one of [1] to [4], wherein the amount of the water-soluble organic solvent in the aqueous solution of the water-soluble organic solvent is 20 to 60 mass %. [6] The aqueous solution of a water-soluble organic solvent according to any one of [1] to [5], wherein the dietary fiber of the membrane raw material (2) is a dietary fiber containing water-soluble dietary fiber and water-insoluble dietary fiber. [7] A method for producing a film, characterized by applying the aqueous solution of the water-soluble organic solvent according to any one of [1] to [6] to an article and then drying it to form a film. [8] An article having a film formed on the surface thereof, obtained by applying the aqueous solution of the water-soluble organic solvent according to any one of [1] to [6] to the article and then drying the applied solution. [9] A method for producing the aqueous solution of a water-soluble organic solvent according to [1], comprising the following membrane raw materials (1) and (2), characterized by comprising the following steps (a) to (c): (a) A process for producing a water-soluble organic solvent containing the membrane raw material (1), which comprises mixing 1 to 60 parts by mass of the membrane raw material (1) with 100 parts by mass of the water-soluble organic solvent. (b) a step of producing an aqueous solution containing the membrane raw material (2), in which 0.2 to 8 parts by mass of the membrane raw material (2) is mixed with 100 parts by mass of water; (c) a mixing step of mixing the water-soluble organic solvent containing the membrane raw material (1) obtained in the step (a) with the aqueous solution containing the membrane raw material (2) obtained in the step (b) to produce an aqueous solution of the water-soluble organic solvent, wherein the mixing mass ratio of the water-soluble organic solvent to the aqueous solution is 10:90 to 80:20. Film material (1): Oil powder with a melting point of 55°C or higher Membrane ingredient (2): Dietary fiber

[10] The method for producing the aqueous solution of a water-soluble organic solvent according to [9], wherein the oil or fat powder of the membrane raw material (1) has an average particle size of 200 μm or less.

[11] The method for producing a water-soluble organic solvent according to [9] or

[10] , wherein the amount of the membrane raw material (1) in the water-soluble organic solvent in the step (a) is 1 to 30 mass %.

[12] The method for producing an aqueous solution of a water-soluble organic solvent according to any one of [9] to

[11] , characterized in that the amount of the membrane raw material (2) in the aqueous solution of (2) in the step (b) is 0.5 to 5 mass %.

[13] The method for producing an aqueous solution of a water-soluble organic solvent according to any one of [9] to

[12] , characterized in that the mixing mass ratio of the water-soluble organic solvent to the aqueous solution in the step (c) is 25:75 to 55:45.

[14] The method for producing an aqueous solution of a water-soluble organic solvent according to any one of [9] to

[13] , wherein the dietary fiber of the membrane raw material (2) is a dietary fiber containing water-soluble dietary fiber and water-insoluble dietary fiber. [Effects of the Invention]

[0007] According to the present invention, it is possible to provide a solution capable of producing a film having a water-repellent effect, and a method for producing the same. Furthermore, according to the present invention, it is possible to provide a film having a water-repellent effect and an edible film having a water-repellent effect. [Brief explanation of the drawings]

[0008] [Figure 1] This is a photograph of a single drop of water being dropped onto a film obtained by applying the aqueous ethanol solution of Example 5 to a medicine paper and drying it. The dark white square area inside the medicine paper is the film that adheres to the medicine paper, and the sphere in the middle is the water droplet. This photograph shows that this film has a high water-repellent effect, to the extent that the water droplet rolls off the film. DETAILED DESCRIPTION OF THE INVENTION

[0009] Specific embodiments of the present invention will be described in detail below, but the present invention is not limited to the following embodiments and can be implemented with appropriate modifications within the scope of the object of the present invention.

[0010] The present invention relates to an aqueous solution of a water-soluble organic solvent containing the following membrane raw materials (1) and (2), wherein the content of the membrane raw material (1) in the aqueous solution of the water-soluble organic solvent is 2 to 10 mass %, the content of the membrane raw material (2) is 0.1 to 5 mass %, and the content of the water-soluble organic solvent is 8 to 75 mass %. Film material (1): Oil powder with a melting point of 55°C or higher Membrane ingredient (2): Dietary fiber

[0011] [Membrane raw material (1)] First, the membrane material (1) used in the present invention will be explained. The membrane raw material (1) is a fat or oil powder having a melting point of 55°C or higher. Examples of raw materials for the fat and oil powder include palm stearin, extremely hardened palm oil, extremely hardened rapeseed oil, extremely hardened high-erucic acid rapeseed oil, extremely hardened soybean oil, extremely hardened sunflower oil, and extremely hardened safflower oil, all of which contain 80 mass % or more of the fatty acids constituting the fat and oil and are saturated fatty acids having 16 or more carbon atoms. One or more of these can be used. The melting point of the oil or fat powder is 55°C or higher, preferably 58°C or higher, and more preferably 61°C or higher, and the upper limit of the melting point is preferably 90°C or lower, more preferably 80°C or lower, and even more preferably 75°C or lower. It should be noted that the oil and fat powder is different from powdered oil and fat obtained by spray-drying an emulsion of an aqueous solution containing oil and fat, excipients, emulsifiers, etc.

[0012] The melting point of the oil or fat powder used as the film material (1) in the present invention can be determined by DSC (differential scanning calorimetry) measurement. For example, a DSC (DSC1 manufactured by Mettler-Toledo) was used to measure the endothermic curve by heating the sample at a temperature increase rate of 10°C / min. The melting point can be determined as the temperature at the intersection of the baseline before the onset of endothermic reaction due to heating and the descending line of the endothermic peak.

[0013] The average particle size (effective diameter) of the oil or fat powder of the membrane raw material (1) used in the present invention is preferably 200 μm or less, more preferably 0.5 to 100 μm, even more preferably 0.5 to 40 μm, still more preferably 1 to 30 μm, and most preferably 1 to 20 μm. Here, the average particle size (effective diameter) refers to the volume mean diameter [MV], and the volume mean diameter [MV] is determined by measuring the volume-based particle size distribution by dry measurement using a particle size distribution analyzer (e.g., manufactured by Shimadzu Corporation, device name: SALD-2300) based on the laser diffraction scattering method (ISO13320, JIS Z 8825-1), and the obtained volume mean diameter [MV] is taken as the average particle size. The volume mean diameter [MV] can be calculated from the following formula using the particle size, particle volume, and total particle volume values ​​of the particles. Volume mean diameter [MV] = sum of (particle size x particle volume) / sum of particle volumes The effective diameter means the particle size of a sphere when the measured diffraction pattern of the crystal to be measured matches the theoretical diffraction pattern obtained assuming the crystal is spherical. In this way, in the case of the laser diffraction scattering method, the effective diameter is calculated by matching the theoretical diffraction pattern obtained assuming the crystal is spherical with the measured diffraction pattern, so that the measurement can be performed using the same principle whether the object to be measured is plate-shaped or spherical.

[0014] The method for producing the fat powder used as the membrane raw material (1) in the present invention is not particularly limited. For example, the fat powder raw material having a melting point of 55° C. or higher can be produced by pulverizing the fat powder raw material using a cyclone mill, hammer mill, or other pulverizer, airflow pulverization using a fluidized bed jet mill, counter-type jet mill, or other conventionally known method, such as freeze pulverization, extrusion granulation, or spray cooling.

[0015] The oil and fat powder of the membrane raw material (1) used in the present invention contains an oil and fat component, which contains at least XXX-type triglycerides and optionally contains other triglycerides. The fat and oil component contains one or more XXX triglycerides having a fatty acid residue X with a carbon number of x at positions 1 to 3 of glycerin. The XXX triglycerides are triglycerides having a fatty acid residue X with a carbon number of x at positions 1 to 3 of glycerin, and each fatty acid residue X is the same as the others. Here, the carbon number x is an integer selected from 16 to 20, preferably an integer selected from 16 to 18, and more preferably 18. The fatty acid residue X may be a saturated or unsaturated fatty acid residue. Specific examples of the fatty acid residue X include, but are not limited to, palmitic acid, stearic acid, and arachidic acid. Palmitic acid and stearic acid are more preferred fatty acids, and stearic acid is even more preferred. The content of the XXX triglyceride is, when the total mass of the oil / fat powder or oil / fat component is taken as 100% by mass, for example, 50% by mass or more, preferably 60% by mass or more, more preferably 70% by mass or more, and even more preferably 80% by mass or more as the lower limit, and for example, 100% by mass or less, preferably 99% by mass or less, and more preferably 95% by mass or less as the upper limit. One or two or more types of XXX triglyceride can be used, preferably one or two types, and more preferably one type is used. When two or more types of XXX triglyceride are used, the total value thereof is the content of the XXX triglyceride.

[0016] The fat and oil component may contain other triglycerides in addition to the above-mentioned XXX triglycerides, as long as the effects of the present invention are not impaired. The other triglycerides may be multiple types of triglycerides, and may be synthetic or natural fat and oil. Examples of synthetic fat and oil include glyceryl tricaprylate and glyceryl tricaprate. Examples of natural fat and oil include cocoa butter, sunflower oil, rapeseed oil, soybean oil, and cottonseed oil. When the total triglycerides in the fat and oil powder or the fat and oil component are taken as 100% by mass, there is no problem if the other triglycerides are contained in an amount of, for example, 1% by mass or more, or about 5 to 50% by mass, when the total mass of the fat and oil powder or the fat and oil component is taken as 100% by mass. The content of other triglycerides is, for example, 0 to 50% by mass, preferably 5 to 40% by mass, more preferably 10 to 30% by mass, and even more preferably 15 to 25% by mass, when the total mass of the oil and fat powder or oil and fat component is 100% by mass.

[0017] The fat and oil powder preferably consists essentially of the fat and oil component, and the fat and oil component preferably consists essentially of triglycerides. The term "substantially" means that the amount of components other than the fat and oil component contained in the fat and oil powder or the components other than triglycerides contained in the fat and oil component is, for example, 0 to 15% by mass, preferably 1 to 10% by mass, and more preferably 2 to 5% by mass, when the fat and oil powder or the fat and oil component is taken as 100% by mass.

[0018] The oil powder used as the membrane raw material (1) in the present invention may be a commercially available oil powder, such as "Konafat #2" sold by Nisshin Oillio Group Co., Ltd. or "Spray Fat NR-100" sold by Riken Vitamin Co., Ltd.

[0019] [Regarding membrane raw material (2)] Next, the membrane material (2) used in the present invention will be explained. The membrane raw material (2) used in the present invention is dietary fiber, and the dietary fiber preferably contains both water-soluble and water-insoluble dietary fiber. The mass ratio of water-soluble dietary fiber to water-insoluble dietary fiber in the dietary fiber is preferably 10:90 to 80:20, more preferably 15:85 to 70:30, and even more preferably 20:80 to 60:40. Furthermore, the dietary fiber is preferably that of citrus fruits, such as the dietary fiber of the juice residue or crushed peel of lime, orange, lemon, etc.

[0020] Commercially available dietary fibers for use in the film raw material (2) of the present invention include "NUTRAVA Citrus Fiber J" manufactured by CP Kelco, "Citrify 100FG" manufactured by Fiberstar, and "Helbasel AQ Plus CF-D" manufactured by MP Gokyo Food & Chemical Co., Ltd.

[0021] [Water-soluble organic solvents] Examples of the water-soluble organic solvent used in the present invention include ethanol and methanol, with ethanol being preferred. The water-soluble organic solvent used in the present invention may be a commercially available product.

[0022] [About water] There are no particular limitations on the water used in the present invention, and tap water, distilled water, etc. can be used.

[0023] [Aqueous Solution of Water-Soluble Organic Solvent Containing Membrane Raw Material (1) and Membrane Raw Material (2)] Next, the aqueous solution of the water-soluble organic solvent containing the membrane raw material (1) and the membrane raw material (2) of the present invention will be explained. The aqueous solution of a water-soluble organic solvent containing a membrane raw material (1) and a membrane raw material (2) of the present invention is an aqueous solution of a water-soluble organic solvent containing the following membrane raw material (1) and membrane raw material (2), in which the content of the membrane raw material (1) in the aqueous solution of the water-soluble organic solvent is 0.5 to 30 mass%, the content of the membrane raw material (2) is 0.1 to 5 mass%, and the content of the water-soluble organic solvent is 8 to 75 mass%. Film material (1): Oil powder with a melting point of 55°C or higher Membrane ingredient (2): Dietary fiber

[0024] The content of the membrane raw material (1) in the aqueous solution of the water-soluble organic solvent is 0.5 to 30% by mass, preferably 1 to 15% by mass, and more preferably 2.5 to 8% by mass. The amount of the membrane raw material (2) in the aqueous solution of the water-soluble organic solvent is 0.1 to 5 mass %, preferably 0.2 to 3 mass %, and more preferably 0.3 to 1.5 mass %. The amount of the water-soluble organic solvent in the aqueous solution of the water-soluble organic solvent is 8 to 75% by mass, preferably 20 to 60% by mass, and more preferably 25 to 60% by mass.

[0025] [Membrane production] The aqueous solution of the water-soluble organic solvent containing the membrane raw material (1) and the membrane raw material (2) of the present invention can be applied to an article and then dried to form a membrane on the article. Examples of the article include paper, food, glass, resin, etc. By forming a film on the surface of these articles, it is possible to impart water repellency to the article. The method for applying the aqueous solution of the water-soluble organic solvent to the article may be to coat the article with the aqueous solution of the water-soluble organic solvent, or to immerse the article in the aqueous solution of the water-soluble organic solvent. Drying may be natural drying or may be carried out using a dryer or the like. In the case of natural drying, after application of the aqueous solution of the water-soluble organic solvent, it is preferable to leave it to dry for 6 hours to several days, more preferably for 12 hours to 48 hours, and even more preferably for 12 hours to 24 hours. In particular, when the article is a food product, an edible film can be produced by using food ingredients or food additives as the raw materials used in the aqueous solution of the water-soluble organic solvent.

[0026] [Method for producing a water-containing aqueous solution of a water-soluble organic solvent containing membrane raw materials (1) and (2)] The aqueous solution of the water-soluble organic solvent containing the membrane raw material (1) and the membrane raw material (2) can be produced by mixing and stirring the membrane raw material (1), the membrane raw material (2), the water-soluble organic solvent, and water. The stirring can be carried out using a stirrer such as a homodisper, a homomixer, or a homogenizer. The stirring conditions vary depending on the amount (scale) of the aqueous solution of the water-soluble organic solvent to be stirred and the stirrer used. For example, when 100 to 500 g of an aqueous solution of a water-soluble organic solvent is stirred with a Homodisper, the stirring conditions are preferably 1000 to 10000 rpm, more preferably 1000 to 5000 rpm, and even more preferably 1000 to 3000 rpm. The stirring time at this time is preferably 5 minutes or more, more preferably 5 to 30 minutes, and even more preferably 5 to 20 minutes. The temperature during stirring is not particularly limited, but it is preferable to stir at a temperature lower than the boiling point of the water-soluble organic solvent. For example, when the water-soluble organic solvent is ethanol, the temperature of the ethanol aqueous solution during stirring is preferably 5 to 50°C, more preferably 10 to 40°C, and even more preferably 10 to 30°C.

[0027] The aqueous solution of the water-soluble organic solvent of the present invention can also be produced by a production method including the following steps (a) to (c): (a) A process for producing a water-soluble organic solvent containing the membrane raw material (1), which comprises mixing 1 to 60 parts by mass of the membrane raw material (1) with 100 parts by mass of the water-soluble organic solvent. (b) a step of producing an aqueous solution containing the membrane raw material (2), in which 0.2 to 8 parts by mass of the membrane raw material (2) is mixed with 100 parts by mass of water; (c) a mixing step of mixing the water-soluble organic solvent containing the membrane raw material (1) obtained in the step (a) with the aqueous solution containing the membrane raw material (2) obtained in the step (b) to produce an aqueous solution of the water-soluble organic solvent, wherein the mixing mass ratio of the water-soluble organic solvent to the aqueous solution is 10:90 to 80:20. Film material (1): Oil powder with a melting point of 55°C or higher Membrane ingredient (2): Dietary fiber In this way, in the production method in which a water-soluble organic solvent containing the membrane raw material (1) and an aqueous solution containing the membrane raw material (2) are separately prepared and then mixed, the resulting solution is more likely to be thickened than in the production method in which the raw materials are stirred and mixed all at once as described above, and this makes it easier to apply to an article when producing a membrane. Furthermore, when a membrane is produced from an aqueous solution of a water-soluble organic solvent prepared by separately preparing a water-soluble organic solvent containing the membrane raw material (1) and an aqueous solution containing the membrane raw material (2) and then mixing them, a more uniform membrane can be formed and the water-repellent effect of the membrane is also higher than when an aqueous solution of a water-soluble organic solvent prepared by stirring and mixing the raw materials as described above is used.

[0028] The stirring in steps (a), (b), and (c) can be carried out using a stirrer such as a homodisper, a homomixer, or a homogenizer. The stirring conditions vary depending on the amount of solution to be stirred (scale) and the stirrer used. For example, when 20 to 500 g of a water-soluble organic solvent, an aqueous solution, or an aqueous solution of a water-soluble organic solvent is stirred with a Homodisper, the stirring conditions are preferably 1000 to 10,000 rpm, more preferably 1000 to 5000 rpm, and even more preferably 1000 to 3000 rpm. The stirring time at this time is preferably 5 minutes or more, more preferably 5 to 30 minutes, and even more preferably 5 to 20 minutes. The temperature during stirring is not particularly limited, but it is preferable to stir at a temperature lower than the boiling point of the water-soluble organic solvent. For example, when the water-soluble organic solvent is ethanol, the temperature of the ethanol aqueous solution during stirring is preferably 5 to 50°C, more preferably 10 to 40°C, and even more preferably 10 to 30°C.

[0029] The amount of the membrane raw material (1) to be mixed with the water-soluble organic solvent in step (a) is 1 to 60 parts by mass, preferably 1 to 30 parts by mass, and more preferably 5 to 20 parts by mass, per 100 parts by mass of the water-soluble organic solvent. The amount of the membrane raw material (2) mixed with water in step (b) is 0.2 to 8 parts by mass, preferably 0.5 to 5 parts by mass, and more preferably 1 to 3 parts by mass, per 100 parts by mass of water. In step (c), the mixing mass ratio of the water-soluble organic solvent containing the membrane raw material (1) to the aqueous solution containing the membrane raw material (2) is 10:90 to 80:20, preferably 25:75 to 55:45, and more preferably 30:70 to 55:45. The mass ratio of the membrane raw material (1) to the membrane raw material (2) is preferably 40:60 to 98:2, more preferably 50:50 to 96:4, and even more preferably 70:30 to 92:8. The amount of the water-soluble organic solvent in the aqueous solution of the water-soluble organic solvent is 5 to 75% by mass, preferably 20 to 60% by mass, and more preferably 25 to 55% by mass. [Example]

[0030] The present invention will now be described in more detail with reference to examples, but the present invention is not limited to these examples.

[0031] [Raw materials used in producing aqueous solutions of water-soluble organic solvents] Table 1 shows the raw materials used in producing the aqueous solution of the water-soluble organic solvent.

[0032] [Table 1]

[0033] Here, the fat powder A "Conafat #2" has an average particle size of 10.0 μm and a melting point of 68.2°C. When the total mass of the fat powder is taken as 100% by mass, the content of XXX-type triglycerides having a fatty acid residue X (stearic acid residue) with 18 carbon atoms at positions 1 to 3 of glycerin is 79.6% by mass. "Kona Fat #2" is a white oil powder made from plant-derived edible oils and fats. In addition, oil powder B ("Spray Fat NR-100") is a white oil powder with an average particle size of 77.2 μm and a melting point of 70.2°C.

[0034] The analytical method for oil and fat powder is described below. Average particle size of oil and fat powder The average particle size was determined by measuring the volumetric particle size distribution by dry measurement using a particle size distribution analyzer (Shimadzu Corporation, device name: SALD-2300) based on the laser diffraction scattering method (ISO13320, JIS Z 8825-1) to determine the volume mean diameter (MV), which was then used as the average particle size. The volume mean diameter (MV) was calculated using the following formula using the particle size, particle volume, and total particle volume values. Volume mean diameter [MV] = sum of (particle size x particle volume) / sum of particle volumes Melting point of oil powder Using a DSC (Mettler-Toledo DSC1), the sample was heated at a rate of 10°C / min to measure the endothermic curve. The melting point was determined as the temperature at the intersection of the baseline before the onset of endothermic absorption and the descending line of the endothermic peak. Triglyceride composition The triglyceride composition was analyzed by gas chromatography under the following conditions: DB1-ht (0.32mm x 0.1μm x 5m) Agilent Technologies (123-1131) Injection volume: 1.0μL Inlet: 370℃ Detector: 370℃ Split ratio: 50 / 1 35.1kPa constant pressure Column CT: 200°C (0 min hold) ~ (15°C / min) ~ 370°C (4 min hold)

[0035] [Production of aqueous solutions, ethanol solutions, and aqueous solutions of ethanol using thickening foods] An aqueous solution (Comparative Example 1), an ethanol solution (Comparative Example 2), and an aqueous solution of ethanol (Comparative Example 3: aqueous solution of water-soluble organic solvent) having the formulations shown in Table 2 were prepared. Here, in order to improve the dispersion stability of the membrane raw material (1) in the solution, it is necessary to increase the viscosity of the solution, so we investigated the formulation using a thickening food that has the effect of increasing the viscosity of the solution. In Comparative Examples 1 to 3, the membrane raw material (1) and the membrane raw material (2) were blended so that the mass ratio was the same. An aqueous solution containing no ethanol was prepared in Comparative Example 1. Specifically, the membrane raw material (2) and the membrane raw material (1) were added to water in a container that was being stirred with a homodisper, and the mixture was then stirred at a rotation speed of 2000 rpm for 10 minutes to prepare an aqueous solution. An ethanol solution without water was prepared in Comparative Example 2. Specifically, the membrane raw material (2) and the membrane raw material (1) were added to ethanol placed in a container and stirred with a homodisper, and then the mixture was stirred and mixed at a rotation speed of 2000 rpm for 10 minutes to prepare the ethanol solution. In Comparative Example 3, an aqueous ethanol solution containing ethanol and water was produced. Specifically, the membrane raw material (2) and the membrane raw material (1) were added to a container in which water and ethanol were stirred using a homodisper, and then the mixture was stirred and mixed at a rotation speed of 2000 rpm for 10 minutes to produce an aqueous ethanol solution. For each solution produced, the mass ratio of membrane raw material (1) to membrane raw material (2) and the ethanol content (mass %) in the total amount of water and ethanol added are shown in the table. The resulting aqueous solution, ethanol solution, and ethanol-containing aqueous solution were placed in a plastic container and visually observed immediately after production. Furthermore, the ethanol-containing aqueous solution (Comparative Example 3) that was dispersed immediately after production was also visually observed one day after production. The results are shown in the table.

[0036] [Table 2]

[0037] The results in Table 2 reveal the following: Immediately after production, Comparative Examples 1 and 2 had floating lumps or undissolved residue, while Comparative Example 3 had a few lumps in the solution, but they were dispersed. Regarding Comparative Example 3, when the dispersibility was checked one day after production, it was found to be the same as immediately after production, with a few lumps in the solution, but the solution was dispersed.

[0038] [Production of aqueous ethanol solution using dietary fiber] An aqueous solution of ethanol (aqueous solution of a water-soluble organic solvent) was prepared according to the formulation shown in Table 3. In Examples 1 to 3, the membrane raw material (1) and the membrane raw material (2) were blended so that their mass ratios were the same. Specifically, the membrane raw material (2) and the membrane raw material (1) were added to a container containing water and ethanol that was being stirred with a homodisper, and the mixture was stirred at a rotation speed of 2000 rpm for 10 minutes to produce an aqueous solution of ethanol. For each solution produced, the mass ratio of membrane raw material (1) to membrane raw material (2) and the ethanol content (mass %) in the total amount of water and ethanol added are shown in the table. The ethanol aqueous solutions obtained in Examples 1 to 3 were in a dispersed state immediately after production, so they were placed in a plastic container and visually observed one day after production. The results are shown in the table.

[0039] [Table 3]

[0040] The results in Table 3 reveal the following: The obtained ethanol aqueous solutions of Examples 1 to 3 were in a dispersed state immediately after production, but a transparent layer was formed on the top one day after production. However, when the container containing the ethanol aqueous solution was shaken up and down, it became uniformly dispersed.

[0041] [Production of membranes using aqueous solutions of ethanol (aqueous solutions of water-soluble organic solvents) and evaluation of the membranes (membrane formation, water repellency)] The ethanol aqueous solution of Comparative Example 3 remained dispersed even one day after production, and the ethanol aqueous solutions of Examples 1 to 3 were uniformly dispersed when the container was shaken up and down one day after production. The ethanol aqueous solution capable of achieving such a dispersed state was applied to medicine wrapping paper and dried to produce a film on the medicine wrapping paper. Specifically, after shaking each of the ethanol-containing aqueous solutions of Comparative Example 3 and Examples 1 to 3 thoroughly, approximately 2 g of the solution was taken with a dropper and applied to a medicine wrapping paper in an area of ​​approximately 5 cm length and 5 cm width, and then left to dry at room temperature for approximately 18 hours. After drying, a film was formed that adhered tightly to the medicine wrapping paper. The formation of a film was visually observed and evaluated according to the criteria shown in Table 4, with one sample on which a film was formed being judged to be acceptable. Furthermore, the water repellency of the film was examined by dropping a drop of water onto the formed film with a dropper, and the water repellency of the film was evaluated according to the criteria shown in Table 4. Films with a score of 1 or 2, which showed water repellency, were judged to be acceptable. Furthermore, when applying an ethanol solution to an article such as medicine wrapping paper, if the ethanol solution has a suitable viscosity, the adhesion of the ethanol solution to the article improves, making application easier. Therefore, as reference data for the physical properties of the ethanol solution, the viscosity of the ethanol solution (visual observation) and the ease of application (applicability) were investigated, and rated on a three-level scale of ◎, ○, and △. The results of these evaluations are shown in Table 5.

[0042] [Table 4]

[0043] [Table 5]

[0044] The results in Table 5 reveal the following: The ethanol-containing aqueous solution of Comparative Example 3 was thick and easy to apply to the medicine wrapping paper, and a film could be formed. However, the film obtained did not have a water-repellent effect. The ethanol-water solutions of Examples 1 to 3, which used a fat or oil powder with a melting point of 55°C or higher as the membrane raw material (1) and dietary fiber as the membrane raw material (2), were not thick and were runny, making them difficult to spread, but when dropped onto a medicine wrapping paper, they spread thinly over the paper, and when dried, a film was formed. Furthermore, when a drop of water was dropped onto the obtained film, the drop did not roll off the film, but did not bleed into the medicine wrapping paper, demonstrating that the film had water repellency.

[0045] [Study on the method for producing an aqueous solution of ethanol] With the formulation shown in Table 6, an aqueous solution of ethanol (aqueous solution of a water-soluble organic solvent) was produced by a production method different from that of Examples 1 to 3 described above. First, the membrane raw material (2) was added to water in a container that was being stirred with a homodisper, and the mixture was stirred and mixed to produce an aqueous solution containing the membrane raw material (2). Next, ethanol and the membrane raw material (1) were placed in a separate container and mixed with a spatula. While the aqueous solution was being stirred with a homodisper, the membrane raw material (1)-containing ethanol was gradually added while stirring with a patula. The mixture was stirred for 5 minutes with a homodisper (rotation speed: 2000 rpm) to produce an aqueous solution of ethanol containing the membrane raw materials (1) and (2). The formulation of Example 4 is the same as that of Example 1 described above, the formulation of Example 5 is the same as that of Example 2 described above, and the formulation of Example 6 is the same as that of Example 3 described above, but the manufacturing methods for each are different. The table shows the amount (parts by mass) of membrane raw material (1) in 100 parts by mass of the ethanol solution before mixing, the amount (parts by mass) of membrane raw material (2) in 100 parts by mass of the aqueous solution before mixing, the mass ratio of membrane raw material (1) to membrane raw material (2), the mass ratio of the mixed ethanol solution to the aqueous solution, and the ethanol content (% by mass) in the total amount of the mixed water and ethanol. The possibility of film formation and the water repellency of the film were evaluated using the criteria shown in Table 4 above in the same manner as in Examples 1 to 3. The obtained ethanol aqueous solution was placed in a plastic container and visually observed one day after production. Furthermore, as reference data for the physical properties of the ethanol aqueous solution, the viscosity of the ethanol aqueous solution (visual observation) and the ease of application (applicability) were evaluated using the criteria shown in Table 4 above in the same manner as in Examples 1 to 3. The results of these evaluations are shown in the table.

[0046] [Table 6]

[0047] From the results of the investigation of the production methods of ethanol aqueous solutions shown in Table 6, the following was found. The viscosity and ease of application of the ethanol aqueous solution of Example 4 was moderately thick and very easy to apply, unlike the ethanol aqueous solution of Example 1, which had the same formulation. The ethanol aqueous solutions of Examples 5 and 6 were easier to apply than the ethanol aqueous solutions of Examples 2 and 3, which had the same formulation, respectively. From this experiment, it was found that even if the formulation is the same, the viscosity and ease of application of the ethanol aqueous solution differ depending on the manufacturing method, and that the viscosity and ease of application of the ethanol aqueous solution are improved when manufactured as in Examples 4 to 6. The film obtained by drying the ethanol aqueous solution of Example 4 was more uniform than the film obtained by drying the ethanol aqueous solution of Example 1, which had the same composition. The obtained film had a higher water-repellent effect than the film obtained in Example 1, and had such a water-repellent effect that water droplets rolled off the film. The film obtained by drying the ethanol aqueous solution of Example 5 was more uniform than the film obtained by drying the ethanol aqueous solution of Example 2, which had the same composition. The obtained film had a higher water-repellent effect than the film obtained in Example 2, and had such a water-repellent effect that water droplets rolled off the film. The film obtained by drying the ethanol aqueous solution of Example 6 formed a more uniform film than the film obtained by drying the ethanol aqueous solution of Example 3, which had the same composition. The obtained film had a higher water-repellent effect than the film obtained in Example 3, and had such a water-repellent effect that water droplets rolled off the film.

[0048] [Production of aqueous ethanol solutions (aqueous solutions of water-soluble organic solvents) with varying amounts of ethanol] Using the same amounts of membrane raw materials (1) and (2) as in Example 4, but varying the amount of ethanol, aqueous solutions of ethanol (aqueous solutions of water-soluble organic solvents) were produced in the same manner as in Example 4. Note that Example 8 has the same composition and production method as Example 4. In addition, the amounts of the membrane raw materials (1) and (2) were the same as in Example 5, but the amount of ethanol was changed, and an aqueous solution of ethanol (aqueous solution of a water-soluble organic solvent) was produced in the same manner as in Example 5. Note that Example 15 has the same composition and production method as Example 5. These formulations are shown in Tables 7 to 11. The table shows the amount (parts by mass) of membrane raw material (1) in 100 parts by mass of the ethanol solution before mixing, the amount (parts by mass) of membrane raw material (2) in 100 parts by mass of the aqueous solution before mixing, the mass ratio of membrane raw material (1) to membrane raw material (2), the mass ratio of the mixed ethanol solution to the aqueous solution, and the ethanol content (% by mass) in the total amount of the mixed water and ethanol. The possibility of film formation and the water repellency of the film were evaluated using the criteria shown in Table 4 above in the same manner as in Examples 1 to 3. The obtained ethanol aqueous solution was placed in a plastic container and visually observed one day after production. Furthermore, as reference data for the physical properties of the ethanol aqueous solution, the viscosity of the ethanol aqueous solution (visual observation) and the ease of application (applicability) were evaluated using the criteria shown in Table 4 above in the same manner as in Examples 1 to 3. The results of these evaluations are shown in the table.

[0049] [Table 7]

[0050] [Table 8]

[0051] [Table 9]

[0052] [Table 10]

[0053] [Table 11]

[0054] The results in Tables 7 to 11 reveal the following. When the amounts of membrane raw materials (1) and (2) were kept constant and the amount of ethanol was changed so that the ethanol content in the total amount of water and ethanol was 74.9 to 9.1 parts by mass, the obtained membranes all had a water-repellent effect to the extent that water droplets rolled off the membrane.

[0055] [Production of aqueous ethanol solutions with varying amounts of membrane raw material (1)] Using the formulation of Example 4, in which dietary fiber A was used as the membrane raw material (2), as a reference, ethanol aqueous solutions were produced in the same manner as in Example 4, but with the amount of membrane raw material (1) varied. In addition, with reference to the formulation of Example 5 in which dietary fiber B was used as the membrane raw material (2), an ethanol aqueous solution was produced in the same manner as in Example 5 for a formulation with a small amount of membrane raw material (1). For comparison, an ethanol aqueous solution containing no membrane raw material (1) was produced in the same manner as in Example 4. These compositions are shown in Tables 12 to 14. The table shows the amount (parts by mass) of membrane raw material (1) in 100 parts by mass of the ethanol solution before mixing, the amount (parts by mass) of membrane raw material (2) in 100 parts by mass of the aqueous solution before mixing, the mass ratio of membrane raw material (1) to membrane raw material (2), the mass ratio of the mixed ethanol solution to the aqueous solution, and the ethanol content (% by mass) in the total amount of the mixed water and ethanol. The possibility of film formation and the water repellency of the film were evaluated using the criteria shown in Table 4 above in the same manner as in Examples 1 to 3. The obtained ethanol aqueous solution was placed in a plastic container and visually observed one day after production. Furthermore, as reference data for the physical properties of the ethanol aqueous solution, the viscosity of the ethanol aqueous solution (visual observation) and the ease of application (applicability) were evaluated using the criteria shown in Table 4 above in the same manner as in Examples 1 to 3. The results of these evaluations are shown in the table.

[0056] [Table 12]

[0057] [Table 13]

[0058] [Table 14]

[0059] The results in Tables 12 to 14 reveal the following. A membrane was produced using the aqueous ethanol solution of Comparative Example 5, which did not contain the membrane raw material (1), but the resulting membrane did not have a water-repellent effect. On the other hand, when the membrane raw material (1) was blended, the obtained membrane had a water-repellent effect. This indicates that the membrane material (1) is necessary to form a membrane with water-repellent properties. When dietary fiber A was used as the membrane raw material (2) and the amount of oil / fat powder A in the membrane raw material (1) was varied, all of the membranes produced using the aqueous ethanol solutions in Examples 21 to 25 had a water-repellent effect. In particular, the membranes obtained when the content of oil / fat powder A was 3 to 20 mass % had a higher water-repellent effect, and had such a water-repellent effect that water droplets rolled off the membrane. In addition, the membranes produced using the aqueous ethanol solutions of Examples 26 and 27, which contained a small amount of dietary fiber B in the membrane raw material (2), had a high water-repellent effect, and had such a water-repellent effect that water droplets rolled off the membrane.

[0060] [Production of aqueous ethanol solutions with varying amounts of membrane raw material (2)] Using the formulation of Example 4 as a reference, aqueous ethanol solutions were produced in the same manner as in Example 4, except that the amount of dietary fiber A in the membrane raw material (2) was changed. Furthermore, with reference to the formulation of Example 5, aqueous ethanol solutions were produced in the same manner as in Example 4, except that the amount of dietary fiber B in the membrane raw material (2) was changed. For comparison, an ethanol aqueous solution containing no membrane raw material (2) was produced in the same manner as in Example 4. These formulations are shown in Tables 15 to 19. The table shows the amount (parts by mass) of membrane raw material (1) in 100 parts by mass of the ethanol solution before mixing, the amount (parts by mass) of membrane raw material (2) in 100 parts by mass of the aqueous solution before mixing, the mass ratio of membrane raw material (1) to membrane raw material (2), the mass ratio of the mixed ethanol solution to the aqueous solution, and the ethanol content (% by mass) in the total amount of the mixed water and ethanol. The possibility of film formation and the water repellency of the film were evaluated using the criteria shown in Table 4 above in the same manner as in Examples 1 to 3. Note that for Comparative Example 5, a film could not be produced, so the film was not evaluated. The obtained ethanol aqueous solution was placed in a plastic container and visually observed one day after production. Furthermore, as reference data for the physical properties of the ethanol aqueous solution, the viscosity of the ethanol aqueous solution (visual observation) and the ease of application (applicability) were evaluated using the criteria shown in Table 4 above in the same manner as in Examples 1 to 3. The results of these evaluations are shown in the table.

[0061] [Table 15]

[0062] [Table 16]

[0063] [Table 17]

[0064] [Table 18]

[0065] [Table 19]

[0066] The results in Tables 15 to 19 reveal the following. An attempt was made to produce a membrane using the aqueous ethanol solution of Comparative Example 5, which did not contain the membrane raw material (2), but the dried ethanol solution did not adhere well to the medicine wrapping paper, and a membrane could not be formed. On the other hand, when the film raw material (2) was added, a film could be formed on the medicine wrapping paper. This indicates that the membrane raw material (2) is necessary to form the membrane. Then, membranes were produced using aqueous ethanol solutions containing different amounts of dietary fiber A from membrane raw material (2). All of the membranes obtained had a water-repellent effect, and in particular, the membranes obtained when the dietary fiber A content was 0.2 to 1.9 mass% had a higher water-repellent effect, with water droplets rolling off the membrane. Furthermore, when membranes were produced using aqueous solutions of ethanol containing different amounts of dietary fiber B of membrane raw material (2), all of the obtained membranes had a water-repellent effect. In particular, the membranes obtained when the dietary fiber A content was 0.5 to 1.9 mass % had a higher water-repellent effect, and had such a water-repellent effect that water droplets rolled off the membrane.

[0067] [Study of membrane raw materials (1) and (2)] An ethanol aqueous solution was produced in the same manner as in Example 4, except that the oil powder A in the membrane raw material (1) having the same composition as in Example 4 was replaced with the oil powder B. Further, various thickeners were used in the portion of the membrane raw material (2) of the composition of Example 4, and aqueous solutions of ethanol were prepared in the same manner as in Example 4. These compositions are shown in Tables 20 to 22. The table shows the amount (parts by mass) of membrane raw material (1) in 100 parts by mass of the ethanol solution before mixing, the amount (parts by mass) of membrane raw material (2) in 100 parts by mass of the aqueous solution before mixing, the mass ratio of membrane raw material (1) to membrane raw material (2), the mass ratio of the mixed ethanol solution to the aqueous solution, and the ethanol content (% by mass) in the total amount of the mixed water and ethanol. The possibility of film formation and the water repellency of the film were evaluated using the criteria shown in Table 4 above in the same manner as in Examples 1 to 3. The obtained ethanol aqueous solution was placed in a plastic container and visually observed one day after production. Furthermore, as reference data for the physical properties of the ethanol aqueous solution, the viscosity of the ethanol aqueous solution (visual observation) and the ease of application (applicability) were evaluated using the criteria shown in Table 4 above in the same manner as in Examples 1 to 3. The results of these evaluations are shown in the table.

[0068] [Table 20]

[0069] [Table 21]

[0070] [Table 22]

[0071] From the results of Examples 4 and 5 in Table 6 above and the results in Tables 20 to 22, the following was found. In Examples 32 and 33, in which the oil powder A in the membrane raw material (1) was replaced with oil powder B in the formulations of Examples 4 and 5, the viscosity was lower and the ease of application was also inferior compared to the aqueous ethanol solutions of Examples 4 and 5. Furthermore, the films produced using the aqueous ethanol solutions of Examples 4 and 5 were water-repellent to the extent that water droplets rolled off the film, whereas the films produced using the aqueous ethanol solutions of Examples 32 and 33 had a slightly reduced water-repellent effect, and although the water droplets did not roll off the film, the water droplets did not bleed into the wrapping paper and the film was water-repellent. From this, it was found that when oil powder A with an average particle size of 10.0 μm was used, the viscosity of the aqueous ethanol solution increased, making it easier to apply and resulting in a higher water-repellent effect than when oil powder B with an average particle size of 77.2 μm was used. Furthermore, as the film raw material (2), a food for adjusting the thickness (a food containing dextrin, a thickener (a thickening polysaccharide, CMC), sodium gluconate, and magnesium chloride) and various thickeners were used, but the films obtained did not have a water-repellent effect in any of them.

[0072] [Production of aqueous solution of methanol (aqueous solution of water-soluble organic solvent)] Aqueous solutions of methanol (aqueous solutions of water-soluble organic solvents) were prepared with the formulations shown in Table 23. Here, the formulations of Example and Example are formulations in which the ethanol in the formulations of Example 4 and Example 5 was replaced with methanol, respectively. First, the membrane raw material (2) was added to water in a container that was being stirred with a homodisper, and the mixture was stirred and mixed to produce an aqueous solution containing the membrane raw material (2). Next, methanol and the membrane raw material (1) were placed in a separate container and mixed with a spatula. While the aqueous solution was being stirred with a homodisper, the methanol containing the membrane raw material (1) was gradually added while stirring with a patula. The mixture was stirred for 5 minutes with a homodisper (rotation speed: 2000 rpm) to produce an aqueous solution of methanol containing the membrane raw material (1) and the membrane raw material (2). The table shows the amount (parts by mass) of membrane raw material (1) in 100 parts by mass of the methanol solution before mixing, the amount (parts by mass) of membrane raw material (2) in 100 parts by mass of the aqueous solution before mixing, the mass ratio of membrane raw material (1) to membrane raw material (2), the mass ratio of the mixed methanol solution to the aqueous solution, and the methanol content (% by mass) in the total amount of the mixed water and methanol. The possibility of film formation and the water repellency of the film were evaluated using the criteria shown in Table 4 above in the same manner as in Examples 1 to 3. The obtained methanol aqueous solution was placed in a plastic container, and the state thereof one day after production was visually observed. Furthermore, as reference data for the physical properties of the methanol aqueous solution, the viscosity of the methanol aqueous solution (visual observation) and the ease of application (applicability) were evaluated in the same manner as in Examples 1 to 3, using the same evaluation criteria as those for the viscosity of the ethanol aqueous solution (visual observation) and the ease of application (applicability) shown in Table 4 above. The results of these evaluations are shown in the table.

[0073] [Table 23]

[0074] The results in Table 23 reveal the following: Even when methanol was used instead of ethanol as the water-soluble organic solvent, a film could be formed in the same way as when using ethanol, and the obtained film had a water-repellent effect to the extent that water droplets rolled off the film. In addition, the evaluation of the viscosity and ease of application of the methanol-containing aqueous solution, and the state of the methanol-containing aqueous solution one day after production showed that Example 42 had the same results as Example 4, and Example 43 had the same results as Example 5. This indicates that even when a methanol aqueous solution produced using methanol as the water-soluble organic solvent is used, a film having the same water-repellent effect as an ethanol aqueous solution can be produced.

Claims

1. A water-soluble organic solvent aqueous solution containing the following membrane raw materials (1) and (2), wherein the content of the membrane raw material (1) in the water-soluble organic solvent aqueous solution is 0.5 to 30 mass %, the content of the membrane raw material (2) is 0.1 to 5 mass %, and the content of the water-soluble organic solvent is 8 to 75 mass %. Film raw material (1): Oil powder with a melting point of 55°C or higher Membrane material (2): dietary fiber

2. The aqueous solution of a water-soluble organic solvent according to claim 1, wherein the oil or fat powder of the membrane raw material (1) has an average particle size of 200 μm or less.

3. The aqueous solution of a water-soluble organic solvent according to claim 1, wherein the content of the membrane raw material (1) in the aqueous solution of the water-soluble organic solvent is 1 to 15% by mass.

4. The aqueous solution of a water-soluble organic solvent according to claim 1, wherein the amount of the membrane raw material (2) in the aqueous solution of the water-soluble organic solvent is 0.2 to 3 mass %.

5. The aqueous solution of a water-soluble organic solvent according to claim 1, wherein the amount of the water-soluble organic solvent in the aqueous solution of a water-soluble organic solvent is 20 to 60% by mass.

6. 2. The aqueous solution of a water-soluble organic solvent according to claim 1, wherein the dietary fiber of the membrane raw material (2) is a dietary fiber containing water-soluble dietary fiber and water-insoluble dietary fiber.

7. A method for producing a film, comprising applying the aqueous solution of a water-soluble organic solvent according to any one of claims 1 to 6 to an article and then drying the applied solution to form a film.

8. 7. An article having a film formed on the surface thereof, obtained by applying the aqueous solution of a water-soluble organic solvent according to claim 1 to an article and then drying the applied solution.

9. 2. A method for producing a water-containing aqueous solution of a water-soluble organic solvent according to claim 1, comprising the following membrane raw materials (1) and (2): (a) A step of producing a water-soluble organic solvent containing the membrane raw material (1), which comprises mixing 1 to 60 parts by mass of the membrane raw material (1) with 100 parts by mass of the water-soluble organic solvent. (b) A step of producing an aqueous solution containing the membrane raw material (2), in which 0.2 to 8 parts by mass of the membrane raw material (2) is mixed with 100 parts by mass of water. (c) A mixing step of producing an aqueous solution of a water-soluble organic solvent by mixing the water-soluble organic solvent containing the membrane raw material (1) obtained in the step (a) with the aqueous solution containing the membrane raw material (2) obtained in the step (b), wherein the mixing mass ratio of the water-soluble organic solvent to the aqueous solution is 10:90 to 80:

20. Film raw material (1): Oil powder with a melting point of 55°C or higher Membrane material (2): dietary fiber

10. The method for producing a water-containing solution of a water-soluble organic solvent according to claim 9, wherein the average particle size of the oil or fat powder of the membrane raw material (1) is 200 μm or less.

11. 10. The method for producing an aqueous solution of a water-soluble organic solvent according to claim 9, wherein the amount of the membrane raw material (1) in the water-soluble organic solvent in the step (a) is 1 to 30 mass %.

12. 10. The method for producing an aqueous solution of a water-soluble organic solvent according to claim 9, wherein the amount of the membrane raw material (2) in the aqueous solution of (2) in the step (b) is 0.5 to 5 mass %.

13. 10. The method for producing an aqueous solution of a water-soluble organic solvent according to claim 9, wherein a mixing mass ratio of the water-soluble organic solvent to the aqueous solution in the step (c) is 25:75 to 55:

45.

14. The method for producing a water-containing solution of a water-soluble organic solvent according to any one of claims 9 to 13, wherein the dietary fiber of the membrane raw material (2) is a dietary fiber containing water-soluble dietary fiber and water-insoluble dietary fiber.

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