Adsorption filter for sulfur-containing compounds, method for producing beverage, and method for producing sake

Abstract

To provide technique capable of removing sulfur-containing compounds in liquid while preventing the loss of the color in the liquid.SOLUTION: An adsorption filter for sulfur-containing compounds contains a layered double hydroxide and adsorbs sulfur-containing compounds contained in liquid.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to an adsorption filter for sulfur-containing compounds. [Background technology]

[0002] In various liquids, off-flavors, which are unpleasant odors that the liquid does not inherently have, can become a problem. Sulfur-containing compounds, which are one of the substances that cause off-flavors, are particularly likely to be problematic because they have a low threshold. For example, in sake, off-flavors caused by sulfur-containing compounds such as dimethyl trisulfide occur when sake is stored at high temperatures for a long period of time. Methods for removing such sulfur-containing compounds include dispersing activated carbon in the liquid to adsorb unwanted substances, and then filtering the activated carbon (for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 5-317024 Summary of the Invention [Problem to be solved by the invention]

[0004] The inventors of the present application have found that, when sulfur-containing compounds are adsorbed on activated carbon according to the method described in Patent Document 1, not only the sulfur-containing compounds but also the color components of sake are adsorbed and removed. This problem is not limited to sake, but is also common to other beverages and liquids other than beverages. Therefore, there is a demand for a technology that can remove sulfur-containing compounds from a liquid while suppressing the loss of components related to the color, taste, etc. of the liquid. [Means for solving the problem]

[0005] The present disclosure can be realized in the following forms.

[0006] (1) According to one embodiment of the present disclosure, there is provided an adsorption filter for sulfur-containing compounds. The adsorption filter for sulfur-containing compounds is characterized in that it contains a layered double hydroxide and adsorbs the sulfur-containing compounds contained in a liquid. According to the adsorption filter for sulfur-containing compounds of this embodiment, the sulfur-containing compounds are adsorbed to the layered double hydroxide, so that the sulfur-containing compounds in the liquid can be adsorbed and removed while suppressing damage to components related to the color, taste, etc. of the liquid.

[0007] (2) In the sulfur-containing compound adsorption filter described in (1) above, the liquid may be a beverage. The sulfur-containing compound adsorption filter of this form can adsorb the sulfur-containing compounds in the beverage while suppressing the loss of components related to the color, taste, etc. of the beverage.

[0008] (3) In the sulfur-containing compound adsorption filter described in (2) above, the beverage may be sake. The sulfur-containing compound adsorption filter of this form can adsorb the sulfur-containing compounds in sake while suppressing the loss of components related to the color, taste, etc. of sake.

[0009] (4) In the adsorption filter for sulfur-containing compounds according to any one of (1) to (3), the layered double hydroxide contains Zn as a divalent metal ion. 2+ At least one of these is included, and the trivalent metal ion is Al. 3+ According to the adsorption filter for sulfur-containing compounds of this embodiment, the sulfur-containing compounds can be more efficiently adsorbed.

[0010] (5) In the sulfur-containing compound adsorption filter according to any one of (1) to (4), the sulfur-containing compound may contain at least one selected from the group consisting of dimethyl trisulfide, dimethyl disulfide, and hydrogen sulfide. The sulfur-containing compound adsorption filter of this form can adsorb and remove sulfur-containing compounds with a low threshold value.

[0011] (6) According to another aspect of the present disclosure, there is provided a method for producing a beverage. This method for producing a beverage includes a step of contacting an adsorption filter containing a layered double hydroxide with a beverage, and the step causes sulfur-containing compounds contained in the beverage to be adsorbed onto the adsorption filter. According to this aspect of the beverage production method, the step of contacting an adsorption filter containing a layered double hydroxide with a beverage causes the sulfur-containing compounds contained in the beverage to be adsorbed onto the adsorption filter, so that the sulfur-containing compounds in the beverage can be adsorbed and removed while suppressing damage to components related to the color, taste, etc. of the beverage.

[0012] (7) According to another aspect of the present disclosure, there is provided a method for producing sake. This method for producing sake includes a step of contacting an adsorption filter containing a layered double hydroxide with sake, and is characterized in that the sulfur-containing compounds contained in sake are adsorbed onto the adsorption filter by the step. According to this aspect of the method for producing sake, the sulfur-containing compounds contained in sake are adsorbed onto the adsorption filter by the step of contacting the adsorption filter containing a layered double hydroxide with sake, so that the sulfur-containing compounds in sake can be adsorbed and removed while suppressing damage to components related to the color, taste, etc. of sake.

[0013] The present disclosure can be realized in various forms, for example, a method for producing an adsorption filter for sulfur-containing compounds, a method for removing sulfur-containing compounds, a method for removing off-flavors, etc. [Brief description of the drawings]

[0014] [Figure 1] FIG. 1 is a schematic diagram showing a schematic configuration of an adsorption filter for sulfur-containing compounds. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] A. Embodiment: 1 is a schematic diagram showing a schematic configuration of a sulfur-containing compound adsorption filter 10 according to one embodiment of the present disclosure. The sulfur-containing compound adsorption filter 10 contains a layered double hydroxide 20 and adsorbs sulfur-containing compounds contained in a liquid.

[0016] The "liquid" in the present disclosure is not particularly limited, but may be, for example, a hydrophilic liquid. The hydrophilic liquid is not particularly limited, but may be, for example, a beverage or a liquid other than a beverage. The beverage is not particularly limited, but may be an alcoholic beverage or a non-alcoholic beverage. The alcoholic beverage is not particularly limited, but may be, for example, various alcoholic beverages such as sake, wine, beer, whiskey, brandy, and mixed liquor. The non-alcoholic beverage is not particularly limited, but may be, for example, various beverages such as green tea, black tea, barley tea, Chinese tea, coffee, carbonated beverages, and juices. The water other than beverages is not particularly limited, but may be, for example, river water, lake water, sea water, industrial water, agricultural water, and the like. As the liquid containing the sulfur-containing compound to be adsorbed by the adsorption filter 10, a beverage is preferable, and sake is particularly preferable.

[0017] In the present disclosure, the term "sulfur-containing compound" refers to a compound containing a sulfur atom in its chemical structure, and in particular, refers to a volatile compound that may cause off-flavors. Examples of sulfur-containing compounds include, but are not limited to, hydrogen sulfide and polysulfides. In the present disclosure, polysulfides are compounds represented by the general formula R-[S] n-R’ (wherein neither R nor R’ is a hydrogen atom, and n represents an integer of 1 or more). The polysulfide is not particularly limited, and examples thereof include dimethyl trisulfide (DMTS), dimethyl disulfide (DMDS), dimethyl sulfide (DMS), and monosulfide (DAS). Here, DMTS has a particularly low odor threshold and is known as a major component of the aged aroma, which is an off-odor of sake. DMTS is known to cause sulfide-like off-flavors during the manufacturing process or storage in various beverages including sake. The sulfur-containing compound adsorbed by the adsorption filter 10 may contain at least one selected from the group consisting of dimethyl trisulfide, dimethyl disulfide, and hydrogen sulfide. Further, the sulfur-containing compound adsorbed by the adsorption filter 10 may be one or more of the compounds in the above specific examples.

[0018] In the present disclosure, "layered double hydroxide" (LDH) means a layered non-stoichiometric compound represented by the following general formula (1). The layered double hydroxide 20 has a structural unit composed of a positively charged basic layer and an intermediate layer having an anion that electrically neutralizes the positive charge.

[0019] [M 2+ 1-x M 3+ x (OH)2] x+ [A n- x / n ·yH2O] x- (1) (wherein M 2+ represents a divalent metal ion, M 3+ represents a trivalent metal ion, A n- represents an n-valent anion, yH2O represents interlayer water, n is a natural number from 1 to 4, 0.1 ≦ x ≦ 0.4 is satisfied, and 0 < y is satisfied.)

[0020] M 2+ is not particularly limited, but from the viewpoint of efficiently removing sulfur-containing compounds in a liquid, Mg 2+ , Ca 2+, Mn 2+ , Fe 2+ , Co 2+ , Ni 2+ , Cu 2+ , Zn 2+ It is preferable that the metal oxide is at least one selected from the group consisting of Mg 2+ , Zn 2+ More preferably, the metal oxide is at least one selected from the group consisting of Zn 2+ It is more preferred that the compound contains M 3+ The catalyst is not particularly limited, but from the viewpoint of efficiently removing sulfur-containing compounds in the liquid, Al is 3+ , Fe 3+ , Cr 3+ , Co 3+ , Ga 3+ , In 3+ , Mn 3+ , V 3+ It is preferable that the metal oxide is at least one selected from the group consisting of Al 3+ It is more preferable that the composition contains n- The sulfur-containing compound in the liquid is not particularly limited, but from the viewpoint of efficiently removing the sulfur-containing compound in the liquid, OH - , Cl - , Br - , CO3 2- , NO3 - , SO4 2- , SiO4 4- , Fe(CN)6 4- , and tartrate ion, and CO3 2- , NO3 - More preferably, the carbon dioxide gas is at least one selected from the group consisting of CO3 2- It is further preferred that the composition comprises:

[0021] Layered double hydroxide 20 contains Zn as the divalent metal ion. 2+ At least one of these is included, and the trivalent metal ion is Al. 3+ In other words, the layered double hydroxide 20 is preferably a Zn-Al system. The term "system" used here refers to at least the A in the above general formula (1). n-The layered double hydroxide 20 may be a mixture of multiple types of layered double hydroxides having different constituent metal ions or anions.

[0022] The layered double hydroxide 20 has high selectivity. Therefore, the adsorption filter 10 of the present disclosure can suppress the adsorption of components other than sulfur-containing compounds. As a result, desired components such as color components and flavor components in the liquid can be left in the liquid. Therefore, the adsorption filter 10 of the present disclosure can adsorb and remove sulfur-containing compounds in the liquid while suppressing the loss of components related to the color and taste of the liquid. In addition, unlike the present application, the catalyst action of the late transition metal can suppress the generation of other unpleasant taste substances compared to the configuration in which sulfur-containing compounds are removed using fine particles of late transition metals. In addition, unlike the present application, the moisture absorption action of silica gel can suppress the fluctuation of the component concentration in the liquid. For example, when the liquid is an alcoholic beverage such as sake, the alcohol concentration in the liquid can be suppressed from fluctuating. In addition, since the layered double hydroxide 20 is a substance that is generally used as an antacid, it is less dangerous. For this reason, the adsorption filter 10 of the present disclosure is also suitable for the manufacturing process of beverages.

[0023] As shown in FIG. 1, the adsorption filter 10 of this embodiment includes a container 30. The container 30 is formed in a column shape and has an approximately cylindrical external shape. In the adsorption filter 10 of this embodiment, the container 30 is filled with granular layered double hydroxide 20. In this embodiment, the layered double hydroxide 20 is sandwiched and held by a permeable sealant 40 to prevent it from flowing out of the container 30. The liquid from which the off-flavor is to be removed is introduced from one end of the container 30, comes into contact with the layered double hydroxide 20, and is discharged from the other end of the container 30. The shape of the container 30 is not limited to a column shape, and may be any shape, such as a cylindrical shape having a double cylindrical structure with permeability, a bag shape with permeability, a porous body shape, or the like. The material of the container 30 is not particularly limited, and may be made of any material, such as glass or acrylic resin. The material of the sealant 40 is not particularly limited, and may be made of any material, such as quartz wool.

[0024] According to the adsorption filter 10 in which the container 30 is filled with the layered double hydroxide 20, the contact efficiency between the liquid from which off-flavors are to be removed and the layered double hydroxide 20 can be improved, and therefore the adsorption efficiency can be improved. In addition, the adsorption filter 10 can be easily replaced, improving convenience for users. In addition, the pressure loss can be reduced, and therefore a decrease in flow rate can be suppressed. In addition, when the liquid is a beverage, the method can be easily applied to the beverage filling process, and therefore the beverage manufacturing process can be prevented from becoming complicated. For example, compared to an embodiment in which layered double hydroxide powder is directly applied, unlike the present application, the step of removing the layered double hydroxide by filtration can be omitted.

[0025] The layered double hydroxide 20 contained in the adsorption filter 10 may be supported on a carrier. The carrier is not particularly limited, and examples thereof include metal oxides, clay, silicon materials, carbon materials, synthetic or natural polymers, etc. The method for supporting the layered double hydroxide 20 on the carrier is not particularly limited, and examples thereof include a method of coating the surface of the carrier and a method of mixing the carrier with the layered double hydroxide 20. According to the embodiment in which the layered double hydroxide 20 is supported on the carrier, the degree of freedom of the shape of the adsorption filter 10 can be increased, and powder leakage of the layered double hydroxide 20 can be suppressed. Furthermore, powder leakage of the layered double hydroxide 20 caused by friction between the layered double hydroxides 20 when a liquid passes through the layered double hydroxide 20 can also be suppressed. In the embodiment in which the layered double hydroxide 20 is supported on the carrier, the sealant 40 can be omitted.

[0026] According to another aspect of the present disclosure, there is provided a method for producing a beverage. This method for producing a beverage includes a step of contacting an adsorption filter 10 containing a layered double hydroxide 20 with a beverage, and this step causes sulfur-containing compounds contained in the beverage to be adsorbed onto the adsorption filter 10. According to this method for producing a beverage, the sulfur-containing compounds contained in the beverage can be removed by being adsorbed onto the adsorption filter 10 containing the layered double hydroxide 20, so that the sulfur-containing compounds in the beverage can be removed while suppressing damage to components related to the color, taste, etc. of the beverage. Furthermore, because the above steps are simple, it is expected that the production efficiency of the beverage can be increased while improving the quality.

[0027] According to another aspect of the present disclosure, there is provided a method for producing sake. This method for producing sake includes a step of contacting sake with an adsorption filter 10 containing a layered double hydroxide 20, and this step causes the sulfur-containing compounds contained in the sake to be adsorbed onto the adsorption filter 10. According to this method for producing sake, the sulfur-containing compounds contained in sake can be removed by being adsorbed onto the adsorption filter 10 containing the layered double hydroxide 20, so that the sulfur-containing compounds in the sake can be removed while suppressing damage to components related to the color, taste, etc. of the sake. Furthermore, because the above steps are simple, it is expected that the efficiency of sake production can be increased while improving the quality. EXAMPLES

[0028] The present invention will be described in more detail below with reference to examples, but the present invention is not limited to the following examples.

[0029] 1. Performance comparison experiment between activated carbon and layered double hydroxide (LDH) A comparative experiment on the performance of powdered activated carbon and powdered LDH as adsorbents was conducted. As the liquid, sake (Oseto no Hanayome, manufactured by Nishino Kinryo Co., Ltd.) that had been stored in a 45°C incubator for 88 days (approximately 3 months) was used. 100 mL of sake and 200 mg of adsorbent (activated carbon or LDH) were placed in a 200 mL glass container, sealed, and stirred at 500 rpm for 24 hours at room temperature. Then, the mixture was suction filtered using a 0.45 μm membrane filter. As a control, sake that had not been added with an adsorbent was filtered without adding an adsorbent. Then, the DMTS concentration in each sample was analyzed by SBSE (Stir Bar Sorptive Extraction)-GC-MS according to the method described in Isogai, A. et al., J. Agric. Food Chem., 53, 4118-4123 (2005). The color of each sample was also evaluated visually. More specifically, in comparison with the control, those that had no decolorizing performance were marked with an O, and those that had decolorizing performance were marked with an X. The results are shown in Table 1 below.

[0030] [Table 1]

[0031] The results shown in Table 1 reveal the following. In other words, the DMTS concentration was reduced in both activated carbon and LDH compared to the control. This indicates that LDH has the same DMTS adsorption capacity as activated carbon. In addition, while activated carbon exhibited decolorization performance, LDH did not. These results indicate that LDH can remove sulfur-containing compounds from liquids while suppressing deterioration of the color of the liquid.

[0032] 2. Comparative evaluation of filter configurations The performance of various types of filters was compared and evaluated. As filters containing LDH, cylindrical filters, column filters, and bag filters were assumed. For cylindrical filters, column filters, and bag filters, powdered LDH was assumed to be packed in a container. In addition, LDH powder, activated carbon powder, and an activated carbon filter with activated carbon packed in a container were assumed. For each example, the simplicity was evaluated based on the outline and number of steps when used in sake production. The simplicity was evaluated as ○ for one step and × for two steps. In addition, the color of each example was assumed based on the results of the above-mentioned performance comparison experiment. Those expected to have no decolorization performance were marked ○, and those expected to have decolorization performance were marked ×. The results are shown in Table 2 below.

[0033] [Table 2]

[0034] The results shown in Table 2 reveal the following. That is, when activated carbon is used, the color is rated as ×, whereas when LDH is used, the color is rated as ○, so it is expected that the color of sake can be maintained. Furthermore, when a filter in the form of a container filled with LDH is used in sake production, it is possible to bring LDH into contact with and separate sake in a single process, so it is expected to be superior in terms of convenience.

[0035] The present invention is not limited to the above-mentioned embodiment, and can be realized in various configurations without departing from the spirit of the present invention. For example, the technical features in the embodiments and examples corresponding to the technical features in each form described in the Summary of the Invention column can be appropriately replaced or combined in order to solve some or all of the above-mentioned problems or to achieve some or all of the above-mentioned effects. Furthermore, if a technical feature is not described as essential in this specification, it can be appropriately deleted. [Explanation of symbols]

[0036] 10...adsorption filter, 20...layered double hydroxide, 30...container, 40...sealing material

Claims

1. An adsorption filter for sulfur-containing compounds, Contains a layered double hydroxide, Adsorbing the sulfur-containing compound contained in the liquid; 1. An adsorption filter for sulfur-containing compounds.

2. The sulfur-containing compound adsorption filter according to claim 1, The liquid is a beverage.

1. An adsorption filter for sulfur-containing compounds.

3. The sulfur-containing compound adsorption filter according to claim 2, The beverage is sake.

1. An adsorption filter for sulfur-containing compounds.

4. The sulfur-containing compound adsorption filter according to claim 1 or 2, The layered double hydroxide contains Zn as a divalent metal ion. ２＋ and containing Al as a trivalent metal ion ３＋ At least 1. An adsorption filter for sulfur-containing compounds.

5. The sulfur-containing compound adsorption filter according to claim 1 or 2, The sulfur-containing compound includes at least one selected from the group consisting of dimethyl trisulfide, dimethyl disulfide, and hydrogen sulfide.

1. An adsorption filter for sulfur-containing compounds.

6. A method for producing a beverage, comprising: contacting an adsorptive filter comprising a layered double hydroxide with a beverage; By the above process, sulfur-containing compounds contained in the beverage are adsorbed onto the adsorption filter. A method for producing a beverage.

7. A method for producing sake, comprising the steps of: The method comprises the step of contacting an adsorption filter containing a layered double hydroxide with sake, Through the above process, sulfur-containing compounds contained in sake are adsorbed onto the adsorption filter. A method for producing sake, comprising the steps of:

Images