Edible oil degradation suppression filter and method for manufacturing the same

Abstract

The present invention provides an edible oil deterioration suppression filter that can efficiently and easily suppress the deterioration of edible oil without the use of filtration aids, and that can prevent a decline in the flavor of food due to the shedding of the deterioration suppressant. [Solution] The edible oil degradation suppression filter comprises fibers 10 and at least one degradation inhibitor 13 selected from carbonates, silicates, tartrates, oxides, hydroxides, alginates, and phosphates, wherein the degradation inhibitor 13 is present both inside and on the surface of the fibers 10.

Description

Technical Field

[0001] The present invention relates to an edible oil deterioration inhibitor filter capable of suppressing oxidative deterioration of edible oil and a method for producing the same.

Background Art

[0002] Edible oils are used in various foods. However, edible oils used for cooking deep-fried foods such as tempura and fried foods oxidatively deteriorate due to heating and standing during cooking, deteriorating the taste, smell, and appearance of the food, and may also cause food poisoning. Oxidatively deteriorated oil has an increased viscosity and poor oil drainage, so edible oil oxidatively deteriorated beyond a predetermined standard is discarded. Therefore, from the perspective of global environmental conservation, it is desired to delay the oxidative deterioration of edible oil as much as possible and reduce the number of times of discarding edible oil. Further, by reducing the number of times of discarding edible oil, there is also an advantage that the number of times of cleaning a deep-frying cooking appliance (fryer) used for deep-fried foods can be reduced, and the amount of water used for cleaning can be reduced.

[0003] Therefore, in order to suppress the oxidative deterioration of edible oil, various filters for edible oil have been proposed conventionally. For example, Patent Document 1 mentions a method of using a tartrate as a purifying agent for edible oil and adding the purifying agent directly to the edible oil. Patent Document 1 also describes a filter in which, for example, potassium hydrogen tartrate is sandwiched between papers and the peripheries of the papers are closed to form a bag shape. Further, Patent Document 2 discloses a filter in which an edible oil deterioration inhibitor is adhered by a binder to at least one or both of the surface and the inner surface of pores of a filter medium. Furthermore, Patent Document 3 describes a filter for filtering edible oil obtained by stirring and mixing fibers such as pulp and an adsorbent such as activated carbon powder in water and dehydrating by compression molding.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

[0005] However, as described in Patent Document 1, when an edible oil purifying agent is added directly to edible oil, the purifying agent may adhere to the food and impair its flavor. Furthermore, in the case of a filter structure in which the edible oil purifying agent is sandwiched between paper and formed into a bag, there is a possibility that the purifying agent inside may leak out when the paper tears, which, like direct addition, could impair the flavor of the food, and there is room for further improvement.

[0006] Furthermore, when manufacturing the filter described in Patent Document 2, it is necessary to manufacture the filter media in advance and then attach the additives to it, which increases manufacturing costs and raises concerns about the increase in environmentally harmful substances and energy required for manufacturing. In addition, since the edible oil degradation inhibitor is attached to the filter media with a binder, some of the degradation inhibitor is covered by the binder, reducing the contact efficiency with the edible oil. Therefore, a large amount of degradation inhibitor is required to obtain a sufficient effect in inhibiting the degradation of edible oil.

[0007] Furthermore, the filter described in Patent Document 3, since the adsorbent is attached to the fibers, achieves sufficient decolorization and deodorization effects, but it cannot sufficiently suppress the deterioration of edible oil. Therefore, it is difficult to reduce the number of times edible oil is discarded, and there is room for further improvement from the perspective of protecting the global environment. In addition, if the adhesive strength between the fibers and the adsorbent is weak, the adsorbent may detach from the fibers, and as in the case of Patent Document 1, there is a possibility that the flavor of the food will be impaired.

[0008] Furthermore, commonly used filters for cooking oil sometimes require a powdered filter aid to be sprinkled on top of the filter paper. While this filter aid helps to suppress the deterioration of cooking oil, its powdery nature can cause it to scatter when sprinkled, and the need to collect the clay-like filter aid during cleaning after filtration can reduce work efficiency.

[0009] This invention has been made in view of the above problems, and aims to provide an edible oil deterioration suppression filter that can efficiently and easily suppress the deterioration of edible oil without using filtration aids, and that can prevent a decrease in the flavor of food due to the shedding of the deterioration inhibitor. Furthermore, the present invention aims to provide a method for manufacturing an edible oil degradation suppression filter that has excellent degradation suppression capabilities, can be easily produced, and can suppress the generation of environmentally harmful substances during production, thereby contributing to the preservation of the global environment.

[0010] In response to these challenges, the applicant has proposed a technology in Japanese Patent Application No. 2021-121669 that can efficiently and easily suppress the deterioration of edible oil without using filtration aids, and that prevents a decline in the flavor of food due to the shedding of the deterioration inhibitor. Japanese Patent Application No. 2021-121669 proposes a method for manufacturing edible oil degradation-inhibiting filters, also known as the "papermaking method," in which a fiber substrate and a degradation inhibitor are added to water and diffusely mixed to prepare an aqueous suspension, which is then dehydrated and dried. According to this manufacturing method, since the degradation inhibitor is held by the fiber without the use of binders, the degradation of edible oil can be efficiently prevented, and filters that prevent the degradation inhibitor from falling off can be easily manufactured. Furthermore, since the process for manufacturing the filter material and the process for attaching the additive can be carried out in a single step, the increase in manufacturing costs can be suppressed, as can the increase in environmentally harmful substances and energy required for manufacturing. Moreover, since water is used as the dispersion medium, it also contributes to the preservation of the global environment.

[0011] However, in the above manufacturing method, if oxides such as calcium oxide and magnesium oxide, which are generally known as deoxidizing agents, are used as degradation inhibitors, in particular alkaline earth metal oxides, a hydration reaction shown in formula (1) below may occur in an aqueous suspension, potentially leading to the loss of sufficient degradation inhibitory function. MO + H2O → M(OH)2···(1) where M is an alkaline earth metal

[0012] Therefore, the present invention also aims to provide an edible oil degradation inhibitory filter and a method for manufacturing the same, which can suppress the deactivation of the degradation inhibitory function even when oxides, particularly alkaline earth metal oxides, are used as degradation inhibitors, and when water is used as the liquid in the process of obtaining the suspension during the manufacture of the edible oil degradation inhibitory filter, taking into consideration the preservation of the global environment. [Means for solving the problem]

[0013] The above objective of the present invention is achieved by the configuration of the edible oil deterioration suppression filter described below [1].

[0014] [1] Fibers and, At least one degradation inhibitor selected from carbonates, silicates, tartrates, oxides, hydroxides, alginates, and phosphates, A filter that suppresses the deterioration of edible oil.

[0015] Furthermore, preferred embodiments of the present invention relating to the edible oil degradation suppression filter are described in the following [2] to

[18] .

[0016] [2] The edible oil deterioration inhibitor filter according to [1], wherein the deterioration inhibitor is at least one selected from tartrates, oxides, and hydroxides. [3] The edible oil deterioration inhibitor filter according to [2], wherein the deterioration inhibitor is an oxide and further comprises a hydration reaction retarder consisting of a sugar alcohol. [4] The edible oil degradation inhibitory filter according to [3], wherein the sugar alcohol is at least one selected from erythritol, glycerin, lactitol, maltitol, mannitol, xylitol, and sorbitol. [5] The edible oil degradation inhibitory filter according to [4], wherein the sugar alcohol is either glycerin or sorbitol, or both. [6] The edible oil deterioration suppression filter according to any one of [3] to [5], wherein the molecular weight of the sugar alcohol is 500 or less. [7] The edible oil deterioration inhibitor filter according to [2], wherein the deterioration inhibitor is an oxide, and further comprises at least one hydration reaction retardant selected from organic acid salts, sulfates, monosaccharides, and disaccharides. [8] The edible oil deterioration inhibitor filter according to [7], wherein the hydration reaction retarder comprises at least one selected from citric acid, calcium sulfate, and sucrose. [9] The edible oil deterioration suppression filter according to [7] or [8], wherein the molecular weight of the hydration reaction retarder is 500 or less.

[10] An edible oil deterioration suppression filter according to any one of [3] to [9], comprising a trace amount of the hydration reaction retarder.

[11] The edible oil deterioration suppression filter according to

[10] , comprising 10 ppm or more of the hydration reaction retardant per gram of the edible oil deterioration suppression filter.

[12] The fiber is the edible oil deterioration inhibitor filter according to any one of [1] to

[11] , which includes beaten fibers.

[13] The fiber has a stem part and a branched part branched from the stem part by beating, The edible oil deterioration inhibitor filter according to

[12] , wherein the branched part holds particles containing the deterioration inhibitor.

[14] The fiber is either one or both of natural fiber and artificial fiber, and is the edible oil deterioration inhibitor filter according to

[12] or

[13] .

[15] The artificial fiber is either one or both of regenerated fiber and synthetic resin fiber, and is the edible oil deterioration inhibitor filter according to

[14] .

[16] The edible oil deterioration inhibitor filter according to any one of [1] to

[15] , wherein the deterioration inhibitor exists both inside and on the surface of the fiber.

[17] Further, it is the edible oil deterioration inhibitor filter according to any one of [1] to

[16] , which includes an adsorbent.

[18] The adsorbent includes at least one selected from silicon dioxide, natural clay, synthetic clay, and activated carbon, and is the edible oil deterioration inhibitor filter according to

[17] .

[0017] Also, the above object of the present invention is achieved by the configuration of

[19] below related to a method for manufacturing an edible oil deterioration inhibitor filter.

[0018]

[19] A method for manufacturing the edible oil deterioration inhibitor filter according to any one of [1] to

[18] , comprising: a step of obtaining a suspension containing the fiber and the deterioration inhibitor; a step of dewatering and drying the suspension; The method for manufacturing an edible oil deterioration inhibitor filter having these steps.

Advantages of the Invention

[0019] According to the present invention, it is possible to provide an edible oil degradation suppression filter that can efficiently and easily suppress the oxidative degradation of edible oil without using filtration aids, and that can prevent the degradation inhibitor from falling off. Furthermore, the manufacturing method of the present invention makes it possible to easily produce edible oil degradation suppression filters with excellent degradation suppression capabilities. In addition, it is possible to suppress the generation of environmentally harmful substances during manufacturing, thereby contributing to the preservation of the global environment. Furthermore, according to the present invention, even when water is used as the liquid in the process of obtaining the suspension during the manufacture of the edible oil degradation suppression filter, taking into consideration the preservation of the global environment, it is possible to provide an edible oil degradation suppression filter and a method for manufacturing the same that can sufficiently suppress the deactivation of the degradation suppression function. [Brief explanation of the drawing]

[0020] [Figure 1] Figure 1 is a photograph used as a drawing to show the surface of the edible oil degradation suppression filter according to this embodiment. [Figure 2] Figure 2 is a photographic representation of a cross-section of the edible oil degradation suppression filter according to this embodiment. [Figure 3] Figure 3 is a schematic diagram showing an example of an edible oil filtration apparatus to which the edible oil degradation suppression filter according to this embodiment can be applied. [Modes for carrying out the invention]

[0021] An embodiment of the edible oil degradation suppression filter according to the present invention will be described below. In the following, the edible oil degradation suppression filter may be simply referred to as the "filter." Furthermore, this embodiment is merely an example of the present invention, and the present invention is not limited to this embodiment. In addition, various modifications or improvements can be made to this embodiment, and such modified or improved forms may also be included in the present invention.

[0022] [Edible oil degradation suppression filter] The edible oil degradation suppression filter according to this embodiment comprises fibers and a degradation inhibitor. The fibers and degradation inhibitor that can be used in the edible oil degradation suppression filter according to this embodiment will be described in detail below.

[0023] <Textiles> The fibers used as the material for the filter can be natural fibers, artificial fibers, or both. These fibers can be used as they are, but it is preferable that they be beaten. By using beaten fibers as the material for the filter, the retention capacity of the degradation inhibitor can be greatly improved. Beating causes the fibers to become fuzzy, forming a trunk-like section and branch-like sections that branch off from the trunk-like section. The branch-like portion is thinner than the trunk-like portion, and during the manufacturing process, the branch-like portion becomes entangled with the particulate degradation inhibitor in the liquid, thus firmly holding the degradation inhibitor. Therefore, when used cooking oil is filtered using the filter of this embodiment, it is possible to prevent the degradation inhibitor from falling off and to prevent the degradation inhibitor from contaminating the filtered cooking oil. In this embodiment of the edible oil deterioration suppression filter, in order to obtain the effect of sufficiently retaining the deterioration suppressant, the diameter of the branch-like portion is preferably 50% or less of the diameter of the trunk-like portion, more preferably 40% or less, and even more preferably 30% or less. Note that "beaten fibers" include dissociated fibers.

[0024] Furthermore, in this embodiment, since the degradation inhibitor is retained within the filter by the fibers, preferably the beaten fibers, there is no need to use powdered filter aids like those commonly used in filters. Therefore, the oxidation and degradation of edible oil can be suppressed efficiently and easily without the use of any additives, and the process of spraying the filter aid does not involve scattering powder, nor does it require the collection of clay-like filter aids during cleaning after filtration, thus improving work efficiency during edible oil filtration. Furthermore, filtration aids may be used as needed, and the amount used can be reduced from the generally accepted amount.

[0025] As will be described later, the filter according to this embodiment is obtained by dewatering and drying a suspension containing fibers, preferably beaten fibers, and a degradation inhibitor. However, in the suspension, not only are particles containing the degradation inhibitor held in the branch-like parts present, but if the degradation inhibitor is dissolved, it is considered that the degradation inhibitor is present both inside and on the surface of the fibers, thus providing an even greater effect in suppressing the degradation of edible oil.

[0026] (Natural fibers) Natural fibers are fibers manufactured from natural materials. The types of natural fibers are not particularly limited and include, for example, wood pulp, cotton, wool fibers, hemp, silk, etc. In this embodiment, natural fibers may be used alone, or artificial fibers, as described later, may be used alone or in combination, but it is preferable to use natural fibers, which have good fluffiness, as the main component. The main component refers to a state in which the amount of natural fibers used is more than 50% by mass of the total mass of fibers used when manufacturing the filter, preferably more than 60% by mass, and more preferably more than 70% by mass.

[0027] (Artificial fiber) When using artificial fibers, at least one selected from regenerated fibers and synthetic resin fibers can be used. Examples of regenerated fibers include rayon. Examples of synthetic resin fibers include polyester resin fibers, polyolefin resin fibers (e.g., polyethylene fibers, polypropylene fibers), polyamide resin fibers (e.g., polyamide 66 fibers), vinyl resin fibers, acrylic resin fibers, polyurethane resin fibers, etc. All of these fibers become fluffy when beaten, and the branched parts can hold particulate degradation inhibitors, so that the degradation inhibitor does not fall off and the degradation inhibitor effect on edible oil can be obtained.

[0028] Regardless of whether the fibers used are natural or artificial, there are no particular limitations on the average fiber length and average fiber diameter. However, fibers with an average fiber length of 0.1 to 15 mm and an average fiber diameter of 0.005 to 0.1 mm are generally preferred.

[0029] (Other fibers) In this embodiment, in addition to the natural and artificial fibers mentioned above, other fibers may be included. Examples of other fibers include metal fibers, glass fibers, carbon fibers, and the like.

[0030] <Degradation inhibitor> The degradation inhibitor used in the filter according to this embodiment has the effect of suppressing the degradation of edible oil by coming into contact with it. It is preferable to use at least one selected from carbonates such as calcium carbonate and magnesium carbonate, silicates such as calcium silicate and magnesium silicate, tartrates such as potassium bitartrate, oxides such as magnesium oxide, calcium oxide and aluminum oxide, hydroxides such as magnesium hydroxide and calcium hydroxide, alginates such as calcium alginate, and phosphates such as trimagnesium phosphate as the degradation inhibitor. In particular, it is more preferable to use at least one selected from tartrates, oxides, and hydroxides.

[0031] Furthermore, the degradation inhibitor may be chemically synthesized during the manufacturing process. For example, calcium oxide reacts with water, the solvent of the aqueous suspension, to synthesize calcium hydroxide, but it may also be present in the filter as calcium hydroxide.

[0032] In the filter according to this embodiment, the mass of the degradation inhibitor relative to the total mass of the filter is preferably 1% by mass or more, and preferably 80% by mass or less. When the mass of the degradation inhibitor relative to the total mass of the filter is 1% by mass or more, the effect of suppressing the degradation of edible oil can be obtained. Furthermore, when the mass of the degradation inhibitor relative to the total mass of the filter is 80% by mass or less, the effect of preventing the degradation inhibitor from falling off can be obtained. When multiple edible oil degradation inhibitors are used in combination, it is preferable that their total amount be within the above numerical range. The mass of the degradation inhibitor relative to the total mass of the filter is more preferably 60% by mass or less, and even more preferably 50% by mass or less.

[0033] The mass of the degradation inhibitor relative to the total mass of the filter can be calculated, for example, by washing the filter with a liquid that dissolves the degradation inhibitor without dissolving the fibers, dissolving and removing the degradation inhibitor present on the surface and inside the fibers, drying the fiber portion, and then measuring the mass difference. Alternatively, the mass of the degradation inhibitor can be calculated by washing the filter with a liquid that dissolves fibers without dissolving the degradation inhibitor, removing the fibers, drying the portion containing the degradation inhibitor, and then measuring the mass difference. Furthermore, the mass of the degradation inhibitor can also be calculated by burning and decomposing organic matter and measuring the ash content.

[0034] Furthermore, when using oxides as degradation inhibitors, examples include oxides of alkaline earth metals. Alkaline earth metals include the four elements calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra), as well as beryllium (Be) and magnesium (Mg).

[0035] Alkaline earth metal oxides may be used alone, or they may be used in combination with other degradation inhibitors. Examples of other degradation inhibitors include hydroxides such as magnesium hydroxide and calcium hydroxide, carbonates such as calcium carbonate and magnesium carbonate, silicates such as calcium silicate and magnesium silicate, tartrates such as potassium bitartrate, alginates such as calcium alginate, and phosphates such as trimagnesium phosphate. These can be used alone or in combination of two or more.

[0036] <Hydration reaction retarder> As described above, oxides such as alkaline earth metal oxides, used as degradation inhibitors, can undergo hydration reactions, potentially leading to the loss of their sufficient degradation inhibitory function. Therefore, hydration retarders are used in combination to slow down the hydration reaction. Specifically, sugar alcohols are used as hydration retarders.

[0037] Specifically, it is preferable to use at least one sugar alcohol selected from erythritol, glycerin, lactitol, maltitol, mannitol, xylitol, and sorbitol. Among these, it is particularly preferable to use at least one selected from glycerin and sorbitol because they have a higher inhibitory effect on the hydration reaction.

[0038] Furthermore, sugar alcohols with a molecular weight of 500 or less are more preferable, and those with a molecular weight of 250 or less are particularly preferable. If the molecular weight of the sugar alcohol is 500 or less, it dissolves well in water, which is the dispersion medium, thus further enhancing the effect of delaying the hydration reaction.

[0039] As described later in the manufacturing method, it is preferable to use an aqueous suspension to protect the environment. However, oxides such as alkaline earth metal oxides are poorly soluble in water and remain attached to the fibers in granular form in the filter, while sugar alcohols are water-soluble and are removed from the filter along with the water during the deliquidation of the aqueous suspension. Nevertheless, a small amount of sugar alcohol remains in the filter attached to the oxides and fibers. This amount of sugar alcohol remaining in the filter is what is known as the "trace amount."

[0040] The sugar alcohols remaining in the filter have the effect of suppressing the hydration reaction between the oxides and moisture in the air or trace amounts of moisture in the edible oil. To reliably obtain this effect, it is preferable that the amount of sugar alcohol remaining in the filter be 10 ppm or more per gram of edible oil degradation suppression filter, and more preferably 50 ppm or more.

[0041] Furthermore, at least one selected from organic acid salts, sulfates, monosaccharides, and disaccharides can be used as a hydration reaction retarder.

[0042] Examples of organic acid salts include citric acid, acetic acid, lactic acid, citrates such as calcium citrate, potassium citrate, and sodium citrate, acetates such as calcium acetate, potassium acetate, and sodium acetate, and lactates such as calcium lactate, potassium lactate, and sodium lactate. Examples of sulfates include calcium sulfate. Examples of monosaccharides include glucose, fructose, mannose, and galactose. Examples of disaccharides include sucrose. These can be used individually or in combination. Among these, it is particularly preferable to use at least one selected from citric acid, calcium sulfate, and sucrose, as this provides a higher inhibitory effect on the hydration reaction.

[0043] Furthermore, these molecules are more preferably 500 or less, and particularly preferably 400 or less. If these molecules are 500 or less, they dissolve well in water, which is the dispersion medium, thus further enhancing the effect of delaying the hydration reaction.

[0044] Similar to the sugar alcohols mentioned above, it remains in the filter as a trace amount and suppresses the hydration reaction caused by moisture in the air and trace amounts of moisture contained in the edible oil. To reliably obtain this effect, it is preferable that the amount of hydration reaction retarder remaining in the filter be 10 ppm or more per gram of edible oil degradation inhibitor filter, and more preferably 50 ppm or more.

[0045] <Other additives> In addition to the degradation inhibitor and hydration reaction inhibitor mentioned above, the filter according to this embodiment may also use an adsorbent having decolorizing and deodorizing effects. Preferably, at least one selected from silicon dioxide, natural clay, artificial synthetic clay, and activated carbon is used as the adsorbent. Furthermore, even when an adsorbent is used, the branched parts of the beaten fibers can retain the adsorbent, preventing the additive from contaminating the edible oil after filtration, while also providing excellent decolorization and deodorizing effects.

[0046] [Method for manufacturing an edible oil degradation suppression filter] The edible oil degradation suppression filter according to this embodiment first involves adding (1) fibers, preferably beaten fibers, (2) a degradation inhibitor, and (3) other degradation inhibitors or adsorbents as needed, to a suitable solvent to obtain a suspension of these mixtures. When using natural fibers, water can be selected as the solvent, and when using artificial fibers, a liquid suitable for beating the fibers used can be selected.

[0047] Furthermore, while an aqueous suspension is preferred from an environmental perspective, if an oxide is used as a degradation inhibitor, a hydration retarder should be used in combination. The hydration retarder may be added to the water at the same time as the degradation inhibitor, but it is preferable to add the degradation inhibitor after the hydration retarder has been sufficiently dissolved in the water, as this more effectively suppresses the loss of sufficient degradation inhibitory function.

[0048] To obtain beaten fibers, one method involves adding the fibers to water along with components (2) and (3) above when obtaining a suspension, and then performing a beating treatment using a beating machine such as a refiner or beater, or a mixing and dispersing machine such as a dissolver or homomixer. Such a beating treatment can make the fibers fluffy and allow them to be uniformly dispersed in the suspension.

[0049] Alternatively, the fibers may be placed in water first, and after being beaten using the aforementioned beating machine or mixing / dispersing machine, the deterioration inhibitor may be added.

[0050] Furthermore, the suspension may contain chemicals commonly used in filter manufacturing, such as paper strength enhancers, yield enhancers, pH adjusters, and fixatives. The amounts of these additives are not particularly limited, as long as they do not affect the human body.

[0051] Then, by removing the suspension and drying it, a filter can be obtained in which particles containing a degradation inhibitor are retained in the fibers. Furthermore, the dewatering process can be carried out by evaporating the water or by filtration (papermaking).

[0052] According to the manufacturing method of this embodiment, since the degradation inhibitor is held by the fibers without the use of a binder or the like, the degradation of edible oil can be efficiently prevented, and filters in which the degradation inhibitor does not fall off can be easily manufactured. Furthermore, since the process for manufacturing the filter media and the process for attaching the additives can be carried out in a single process, it is possible to suppress increases in manufacturing costs and also suppress increases in environmentally harmful substances and energy required for manufacturing. Furthermore, when oxides are used as degradation inhibitors, a hydration reaction retarder is added to the aqueous suspension, which effectively prevents the oxide from undergoing a hydration reaction and losing its degradation inhibitory function.

[0053] To leave trace amounts of the hydration retarder, preferably 10 ppm or more per gram of filter, the content of the hydration retarder in the suspension can be adjusted. Specifically, the content of the hydration retarder in the suspension should be 0.01% by mass or more, preferably 0.05% by mass or more.

[0054] <Solution containing a degradation inhibitor> The degradation inhibitor used in this embodiment may also be one that dissolves in a solvent other than water. In the above manufacturing method, when the beaten fibers and the solution in which the degradation inhibitor is dissolved are mixed, the solution is thought to penetrate into the inside of the fibers, and through the subsequent dewatering and drying process, fine particles containing the degradation inhibitor are thought to precipitate inside the fibers. Furthermore, in the step of mixing the beaten fibers with a solution containing a degradation inhibitor, if the solution contains particles containing the degradation inhibitor, that is, if the particles exist in the solution in a granular state, the particles tend to become entangled in the branched parts of the fibers. For these reasons, it is preferable that the solution containing the degradation inhibitor contains both dissolved degradation inhibitor and particles containing the degradation inhibitor. [Examples]

[0055] The edible oil degradation suppression filter according to the present invention will be further described below with reference to examples. However, the present invention is not limited to the following examples.

[0056] <Test Example 1> Cotton fibers were used as the natural fiber, calcium oxide and potassium bitartrate were used as degradation inhibitors, and activated carbon was used as an adsorbent. These were then added to water and subjected to a beating treatment using a mixer. The composition of the materials other than water was 70% by mass of cotton fibers, 10% by mass of calcium oxide, 10% by mass of potassium bitartrate, and 10% by mass of activated carbon.

[0057] Subsequently, the edible oil degradation inhibitory filter according to this embodiment was obtained by dewatering by filtration and drying. The surface and cross-section of the obtained filter were then photographed with an electron microscope to observe the fibers and degradation inhibitor.

[0058] Figure 1 is a photograph used as a substitute for a drawing, showing the surface of the edible oil degradation suppression filter according to this embodiment. Figure 2 is a photograph used as a substitute for a drawing, showing a cross-section of the edible oil degradation suppression filter according to this embodiment. In Figure 2, the upper part shows the surface layer of the filter cross-section, and the lower part shows the middle layer.

[0059] As shown in Figures 1 and 2, the cotton fibers 10 are beaten to form branch-like portions 12 that branch off from the trunk-like portion 11. Since these branch-like portions 12 are much thinner than the trunk-like portion 11, the particulate degradation inhibitor 13 is entangled in and held by the branch-like portions 12. Furthermore, regardless of the particle size of the degradation inhibitor 13 or its position in the surface layer, middle layer, etc., it is securely held by the branch-like portion 12, preventing the degradation inhibitor 13 from falling off the filter without the use of a binder or the like.

[0060] Furthermore, elemental analysis was performed on the surface of the calcium oxide, a degradation inhibitor coated with platinum. As a result, potassium derived from water-soluble potassium bitartrate was detected, confirming its presence on the calcium oxide powder. Furthermore, elemental analysis was performed on the surface of the platinum-deposited fibers. As a result, potassium (K) derived from potassium bitartrate was detected, confirming the presence of a degradation inhibitor in the fibers. This suggests that the degradation inhibitor permeates the fibers, further inhibiting the degradation of the edible oil.

[0061] Next, Figure 3 is a schematic diagram showing an example of an edible oil filtration apparatus to which the edible oil degradation suppression filter according to this embodiment can be applied. The filtration device 25 comprises an oil tank 21 for storing edible oil 20, an annular pipe 22 through which the edible oil 20 flows, a pump 24 for supplying the edible oil 20, and a processing unit 23 equipped with an edible oil degradation suppression filter for filtering and suppressing oxidative degradation of the edible oil 20. The oil tank 21, pump 24, and processing unit 23 are connected in series by the annular pipe 22.

[0062] In the filtration device 25 configured in this way, the edible oil 20 in the oil tank 21 is pumped through the piping 22 by the pump 24, filtered and oxidative degradation is suppressed in the processing unit 23, and then returned to the oil tank 21. Used edible oil 20 contains impurities such as fried food residue and is also oxidatively degraded, but by passing through the edible oil degradation suppression filter in the processing unit 23, impurities such as fried food residue are filtered out, and the oxidative degradation of the edible oil 20 is suppressed, slowing down the oxidation rate.

[0063] As described above, by processing the edible oil 20 while circulating it, the edible oil 20 used for cooking can be processed continuously. Furthermore, for example, by connecting a piping system 22 containing a pump 24 and a processing unit 23 to the oil tank of a fryer used for frying, the edible oil 20 being used for cooking can be processed in parallel with the cooking process. If the oxidative degradation suppression performance of the edible oil degradation suppression filter deteriorates, if its filtration performance deteriorates, or if it becomes clogged and stops allowing liquid to pass through, the edible oil degradation suppression filter in the processing unit 23 will be replaced with a new one. Furthermore, a standard frying residue collection filter or the like can be installed in front of the edible oil degradation suppression filter within the flow path.

[0064] Furthermore, the edible oil deterioration suppression filter according to this embodiment is not limited to application to the filtration device 25 described above, but can be applied to various filtration devices and filters.

[0065] <Test Example 2> (Example 1) Cellulose fiber was used as the natural fiber, calcium tartrate and potassium bitartrate were used as degradation inhibitors, and activated carbon was used as an adsorbent. These were added to water and subjected to beating treatment using a mixer. The composition of the materials other than water was 10% by mass of calcium oxide, 10% by mass of potassium bitartrate, 10% by mass of activated carbon, and 70% by mass of cellulose fiber. After that, the material was dewatered by filtration and dried to obtain the edible oil degradation inhibitory filter according to this example.

[0066] A disc with a diameter of 90 mm and a thickness of 2.8 mm was cut from the prepared edible oil degradation suppression filter and designated as test piece A. The density of test piece A was 0.28 g / cm³. 3 That was the case.

[0067] (Example 2) A disc with a diameter of 90 mm and a thickness of 0.6 mm was cut from the same edible oil degradation suppression filter as in Example 1, and this was designated as Test Piece B. The density of Test Piece B was 0.43 g / cm³. 3 That was the case.

[0068] (Comparative example) A disc with a diameter of 90 mm and a thickness of 1.0 mm was cut from cellulose filter paper and designated as test specimen C. The density of test specimen C was 0.38 g / cm³. 3 That was the case.

[0069] (Oxidative degradation inhibition test) Oxidative degradation inhibition tests were conducted using test specimens A to C. The filtration apparatus 25 shown in Figure 3 was used for the tests.

[0070] Specifically, one of the filters (test pieces A to C) was loaded into the processing unit 23 of the filtration device 25, and 4 liters of commercially available rapeseed oil (as edible oil 20) was added to the oil tank 21. The oil was then pumped and circulated using the pump 24 while maintaining a temperature of 180°C, and filtered through the filter (test pieces A to C) in the processing unit 23. The oil in the oil tank was kept at 180°C. Edible oil 20 was sampled after 80 hours and its acid value was measured. The acid value of edible oil 20 was measured using potentiometric titration (endpoint: pH 12) in accordance with JIS K2501. The results are shown below. Note that the oxidation inhibition performance is shown as a relative value with the acid value of the comparative example set to 1.

[0071] [Table 1]

[0072] Thus, it can be seen that the edible oil degradation suppression filter according to the present invention exhibits significantly superior oxidation suppression performance compared to the case of using only fibers.

[0073] Although various embodiments have been described above with reference to the drawings, it goes without saying that the present invention is not limited to these examples. It is clear to those skilled in the art that various modifications or alterations can be conceived within the scope of the claims, and these will naturally also fall within the technical scope of the present invention. Furthermore, the components of the above embodiments may be combined in any way without departing from the spirit of the invention.

[0074] This application is based on Japanese patent applications filed on July 26, 2021 (JP 2021-121669), November 24, 2021 (JP 2021-190490), and November 24, 2021 (JP 2021-190491), the contents of which are incorporated by reference in this application. [Explanation of symbols]

[0075] 10 Fibers (Cotton Fibers) 11 Stem 12 Branches 13. Degradation inhibitors 20 Edible oil 21 Oil tank 22 Piping 23 Processing Unit 24 pumps 25 Filtration device

Claims

1. Fibers and, At least one degradation inhibitor selected from carbonates, silicates, tartrates, oxides, hydroxides, alginates, and phosphates, It has, An edible oil degradation inhibitor filter, wherein the degradation inhibitor is present both inside and on the surface of the fibers.

2. The edible oil deterioration inhibitor filter according to claim 1, wherein the deterioration inhibitor is at least one selected from tartrates, oxides, and hydroxides.

3. The edible oil deterioration inhibitor filter according to claim 2, wherein the deterioration inhibitor is an oxide, and further comprises a hydration reaction retarder consisting of a sugar alcohol.

4. The edible oil deterioration suppression filter according to claim 3, wherein the sugar alcohol is at least one selected from erythritol, glycerin, lactitol, maltitol, mannitol, xylitol, and sorbitol.

5. The edible oil degradation suppression filter according to claim 4, wherein the sugar alcohol is either glycerin or sorbitol, or both.

6. The edible oil deterioration suppression filter according to claim 3, wherein the molecular weight of the sugar alcohol is 500 or less.

7. The edible oil deterioration inhibitor filter according to claim 2, wherein the deterioration inhibitor is an oxide, and further comprises at least one hydration reaction retarder selected from organic acid salts, sulfates, monosaccharides, and disaccharides.

8. The edible oil deterioration suppression filter according to claim 7, wherein the hydration reaction retarder comprises at least one selected from citric acid, calcium sulfate, and sucrose.

9. The edible oil deterioration suppression filter according to claim 7, wherein the molecular weight of the hydration reaction retarder is 500 or less.

10. The edible oil deterioration suppression filter according to claim 3, comprising a trace amount of the hydration reaction retarder.

11. The edible oil degradation inhibitor filter according to claim 10, wherein the hydration reaction retarder is contained in an amount of 10 ppm or more per gram of the edible oil degradation inhibitor filter.

12. The edible oil deterioration suppression filter according to claim 1, wherein the fibers include beaten fibers.

13. The aforementioned fiber has a trunk-like portion and branch-like portions that branch off from the trunk-like portion by beating, The edible oil deterioration inhibitor filter according to claim 12, wherein the branch-like portion holds particles containing the deterioration inhibitor.

14. The edible oil degradation suppression filter according to claim 12, wherein the aforementioned fibers are either natural fibers or artificial fibers, or both.

15. The edible oil degradation suppression filter according to claim 14, wherein the artificial fiber is either a regenerated fiber or a synthetic resin fiber, or both.

16. Furthermore, the edible oil deterioration suppression filter according to claim 1, further comprising an adsorbent.

17. The edible oil deterioration suppression filter according to claim 16, wherein the adsorbent comprises at least one selected from silicon dioxide, natural clay, artificial synthetic clay, and activated carbon.

18. A method for producing an edible oil deterioration suppression filter according to any one of claims 1 to 17, A step of obtaining a suspension containing the aforementioned fibers and the aforementioned degradation inhibitor, The steps include removing the liquid from the suspension and drying it, A method for manufacturing an edible oil degradation suppression filter having the following characteristics.

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