Oral composition, color change inhibitor, and method for inhibiting color change

Abstract

(a) A fragrance component having an aldehyde group and (b) a pigment in an oral composition that can suppress color changes due to ultraviolet light and maintain color. [Solution] An oral composition comprising (a) a fragrance component having an aldehyde group, (b) a pigment, and (c) a copper compound.

Description

[Technical Field]

[0001] The present invention relates to an oral composition, a color tone change inhibitor, and a method for inhibiting color tone change. [Background Art]

[0002] In products such as mouthwashes and liquid dentifrices, flavorings and colorants are blended in accordance with consumer preferences in order to differentiate products and increase product value. Many products filled in transparent containers that allow the color of mouthwashes, liquid dentifrices, and the like to be visually recognized are on the market. However, these products may discolor when exposed to light, which impairs the product value. Therefore, studies have been conducted on methods for improving this problem.

[0003] For example, Patent Document 1 discloses a liquid oral composition containing a water-soluble dye and a cationic bactericide, which prevents discoloration of the water-soluble dye by using an aromatic carboxylic acid in combination with another water-soluble carboxylic acid in the presence of a nonionic surfactant. Further, Patent Document 2 discloses a mouthwash colored with a colorant, which prevents discoloration by adjusting the pH to 4.5 to 5.5 with an organic acid buffer. [Prior Art Document] [Patent Documents]

[0004] [Patent Document 1] Japanese Unexamined Patent Application Publication No. 10-120539 [Patent Document 2] Japanese Unexamined Patent Application Publication No. 2004-51511 [Summary of the Invention] [Problem to be Solved by the Invention]

[0005] When the inventors considered incorporating cinnamon and citrus-like fragrances into oral compositions, they found that if the oral composition contains (a) a fragrance component having an aldehyde group and (b) a pigment having such a fragrance, a problem arises in which the color changes due to ultraviolet light. However, the above problem has never been considered before, and no solutions are known.

[0006] The present invention has been made in view of the above circumstances, and aims to suppress color changes caused by ultraviolet light and maintain color in an oral composition containing (a) a fragrance component having an aldehyde group and (b) a pigment. [Means for solving the problem]

[0007] As a result of diligent research, the inventors of the present invention have found that a mouth composition containing (a) a fragrance component having an aldehyde group and (b) a pigment can further suppress color changes by containing (c) a copper compound, and have completed the present invention.

[0008] In other words, the present invention has been able to solve the above problems by the means described below. (1) An oral composition containing (a) a fragrance component having an aldehyde group, (b) a pigment, and (c) a copper compound. (2) The oral composition according to (1) above, wherein the fragrance component having an aldehyde group (a) is at least one of an aromatic aldehyde and a terpene aldehyde. (3) The oral composition according to (1) or (2) above, wherein the dye in (b) is a tar dye. (4) The oral composition according to any one of (1) to (3) above, wherein the copper compound in (c) is at least one of a salt of copper chlorophyllin and copper gluconate. (5)(c) A copper compound as an active ingredient, A color change inhibitor used to suppress color changes in an oral composition containing (a) a fragrance component having an aldehyde group and (b) a pigment. (6) A method for suppressing color change in an oral composition containing (a) a fragrance component having an aldehyde group and (b) a pigment, A method for suppressing color change, comprising adding (a) a fragrance component having an aldehyde group and (b) a dye, and (c) a copper compound to the oral composition. [Effects of the Invention]

[0009] The oral composition of the present invention contains (a) a fragrance component having an aldehyde group and (b) a dye, and further contains (c) a copper compound, thereby suppressing the change in the color of (b) the dye caused by (a) the fragrance component having an aldehyde group, even after irradiation with ultraviolet light. [Brief explanation of the drawing]

[0010] [Figure 1] Figure 1 shows the absorbance versus initial value (%) for Examples 1-3 and Comparative Examples 1-2. [Modes for carrying out the invention]

[0011] The present invention will be described in detail below, but these are merely examples of preferred embodiments and are not limiting to these. The "~" in a numerical range indicates a range that includes the numbers before and after it. For example, "0w / v%~100w / v%" means a range that is greater than or equal to 0w / v% and less than or equal to 100w / v%.

[0012] The oral composition according to this embodiment is an oral composition containing (a) a fragrance component having an aldehyde group, (b) a dye, and (c) a copper compound.

[0013] The color change inhibitor according to this embodiment (hereinafter also referred to as "the agent according to this embodiment") comprises (c) a copper compound as an active ingredient, (a) A color change inhibitor used to suppress color changes in an oral composition containing a fragrance component having an aldehyde group and (b) a pigment.

[0014] The method for suppressing color change according to the present embodiment (also referred to as "the method according to the present embodiment" herein) is a method for suppressing color change that suppresses color change of an oral composition containing (a) a perfume ingredient having an aldehyde group and (b) a dye, which is a method for suppressing color change comprising incorporating (c) a copper compound into the oral composition in addition to (a) the perfume ingredient having an aldehyde group and (b) the dye.

[0015] In an oral composition, when (a) a perfume ingredient having an aldehyde group and (b) a dye are combined, color change occurs due to ultraviolet radiation, and a desired color tone cannot be maintained. In contrast, when a composition containing (a) a perfume ingredient having an aldehyde group and (b) a dye further contains (c) a copper compound, the color change of (b) the dye caused by (a) the perfume ingredient having an aldehyde group is suppressed even after ultraviolet irradiation. Since (a) the perfume ingredient having an aldehyde group has high reactivity, it changes the chemical structure of (b) the dye to cause a color change via ultraviolet radiation, and it is considered that (c) the copper compound suppresses the color change.

[0016] In an oral composition, a copper compound is generally incorporated for the purpose of suppressing bad breath. However, the present inventors have surprisingly found that (c) a copper compound has an effect of suppressing ultraviolet-induced color change in an oral composition containing (a) a perfume ingredient having an aldehyde group and (b) a dye.

[0017] In the present embodiment, examples of the color change include fading, hue change, chroma change, lightness change, and the like. From the viewpoint of maintaining the aesthetics of the oral composition, in the present embodiment, suppressing color change is preferably suppressing fading.

[0018] <(a) Perfume ingredient having an aldehyde group> A perfume ingredient having an aldehyde group provides a scent such as cinnamon or citrus scent that is preferred for oral compositions such as mouthwashes. As a perfume ingredient having an aldehyde group, one or more selected from aliphatic aldehydes, terpene aldehydes, and aromatic aldehydes are preferable because the sharp scent provides excellent medicinal feel and refreshing sensation as an oral composition, and aromatic aldehydes and terpene aldehydes are more preferable.

[0019] As the aliphatic aldehyde, one or more selected from hexyl aldehyde, heptyl aldehyde, octyl aldehyde, nonyl aldehyde, decyl aldehyde, undecyl aldehyde, dodecyl aldehyde, tridecyl aldehyde, trimethylhexyl aldehyde, methyl octyl acetaldehyde, methyl nonyl acetaldehyde, trans-2-hexenal, cis-4-heptenal, 2,6-nonadienal, cis-4-decenal, undecylene aldehyde, trans-2-dodecenal, trimethylundecenal, and 2,6,10-trimethyl-5,9-undecadienal are preferable. As the terpene aldehyde, one or more selected from citral, citronellal, hydroxycitronellal, and perillaldehyde are preferable.

[0020] As the aromatic aldehyde, one or more selected from benzaldehyde, phenyl acetaldehyde, phenyl propyl aldehyde, cinnamic aldehyde, trans-cinnamaldehyde, α-amyl cinnamic aldehyde, α-hexyl cinnamic aldehyde, hydratropic aldehyde, anisaldehyde, p-methylphenyl acetaldehyde, cuminaldehyde, cyclamen aldehyde, 3-(p-t-butylphenyl)-propyl aldehyde, p-ethyl-2,2-dimethylhydrocinnamaldehyde, 2-methyl-3-(p-methoxyphenyl)-propyl aldehyde, p-t-butyl-α-methylhydrocinnamic aldehyde (lilial), salicylaldehyde, heliotropin, helional, vanillin, ethyl vanillin, and methyl vanillin are preferable.

[0021] Among fragrance components containing an aldehyde group, trans-cinnamaldehyde and benzaldehyde are preferred for the cinnamon scent. Among fragrance components containing an aldehyde group, citronellal and citral are preferred for the citrus scent.

[0022] As for the fragrance component having an aldehyde group, from the viewpoint of improving the medicinal effect and refreshing sensation of the oral composition, one or more selected from cinnamaldehyde, citral, and citronellal are preferred.

[0023] Other preferred aldehyde group-containing compounds include one or more selected from methoxydihydrocitronellal, citronellyloxyacetaldehyde, 2,4-dimethyl-3-cyclohexenylcarboxyaldehyde, isocyclocitral, centenal, mylacaldehyde, hydroxymylacaldehyde (lyral), bernaldehyde, dupicard, macéar, boronal, and cetonal.

[0024] The fragrance components containing the aldehyde group mentioned above are also found in essential oils extracted from natural products. Examples of essential oils include cinnamon oil, citronella oil, cumin seed oil, eucalyptus lemon oil, lemon oil, lemon balm oil, lemongrass oil, lemon verbena oil, litsea cubeb oil, and orange oil. Essential oils containing cinnamaldehyde include cinnamon oil, etc. Essential oils containing citronellal include citronella oil, eucalyptus lemon oil, lemon balm oil, etc. Essential oils containing citral include lemon balm oil, lemon oil, lemongrass oil, lemon verbena oil, litsea cubeb oil, and orange oil, etc.

[0025] For the oral composition according to this embodiment, (a) the fragrance component having an aldehyde group is preferably 0.0001 to 1.0 w / v%, more preferably 0.0005 to 0.05 w / v%, and even more preferably 0.001 to 0.01 w / v%, from the viewpoint of medicinal effect and refreshing sensation.

[0026] <(b) Dye> Examples of pigments include azo dyes, xanthene dyes, triphenylmethane dyes, anthraquinone dyes, quinoline dyes, indigo dyes, nitro dyes, nitroso dyes, pyrene dyes, and phthalocyanine dyes. Tar dyes are also preferred as pigments. Examples of tar dyes include azo dyes, xanthene dyes, triphenylmethane dyes, and indigo dyes.

[0027] Examples of azo dyes include azo dyes that do not contain carboxyl groups and sulfone groups, such as Red 221, Red 225, Red 228, Red 404, Red 501, Red 505, Yellow 205, Yellow 401, Yellow 404, Orange 203, Orange 401, Orange 403; Red 2, Red 102, Red 201, Red 202, Red 203, Red 204, Red 205, Red 206, Red Examples include azo dyes containing carboxyl groups and / or sulfone groups, such as Red No. 207, Red No. 208, Red No. 219, Red No. 220, Red No. 227, Red No. 405, Red No. 502, Red No. 503, Red No. 504, Red No. 506, Yellow No. 5, Yellow No. 406, Orange No. 205, Orange No. 402, Brown No. 201, and Black No. 401; and pyrazolone-based azo dyes, such as Yellow No. 4, Yellow No. 402, Yellow No. 407, and Orange No. 204.

[0028] Examples of xanthene pigments include Red No. 3, Red No. 104 (1), Red No. 105 (1), Red No. 106, Red No. 213, Red No. 214, Red No. 215, Red No. 218, Red No. 223, Red No. 230 (1), Red No. 230 (2), Red No. 231, Red No. 232, Red No. 401, Yellow No. 201, Yellow No. 202 (1), Yellow No. 202 (2), Orange No. 201, Orange No. 206, Orange No. 207, and so on.

[0029] Examples of triphenylmethane-based dyes include Blue No. 1, Blue No. 202, Blue No. 203, Blue No. 205, Green No. 3, Green No. 205, and Green No. 402.

[0030] Examples of indigo-based dyes include Blue No. 2, Blue No. 201, and Red No. 226.

[0031] Examples of anthraquinone dyes include anthraquinone dyes that do not contain sulfone groups, such as Blue 204, Blue 403, Green 202, and Violet 201; and anthraquinone dyes that contain sulfone groups, such as Green 201 and Violet 401. Examples of quinoline-based dyes include Yellow 203 and Yellow 204. Examples of nitro-based dyes include (1) Yellow 403. Examples of nitroso dyes include Green No. 401. Examples of pyrene-based dyes include Green No. 204. An example of a phthalocyanine-based dye is Blue No. 404.

[0032] In addition to the pigments mentioned above, natural pigments such as chlorophyll, riboflavin, annat, and anthocyanins may also be used. One or more of these pigments may be used.

[0033] In this embodiment, from the viewpoint of maintaining aesthetics, it is particularly preferable that the oral composition does not fade when exposed to ultraviolet light. Examples of pigments that are prone to fading when exposed to ultraviolet light include azo dyes such as Red No. 102, Red No. 227, Yellow No. 4, and Yellow No. 5; xanthene dyes such as Red No. 104(1) and Yellow No. 201; and triphenylmethane dyes such as Blue No. 1 and Green No. 3.

[0034] Furthermore, the suppression of color change can be evaluated by comparing the absorbance immediately after preparation of the oral composition with the absorbance after UV irradiation, as described later in the examples. In this case, measuring the absorbance at the maximum wavelength of the pigment contained in the oral composition makes it easier to observe the color change.

[0035] In this specification, (b) dye is a different substance from (c) copper compound.

[0036] (b) The pigment content in the oral composition according to this embodiment is suitable at 0.00001 to 0.01 w / v%, preferably 0.00005 to 0.005 w / v%, and more preferably 0.0001 to 0.001 w / v%. When the pigment content is within the above range, the oral composition can be colored with good appearance without impairing aesthetics.

[0037] <(c) Copper compound> (c) Examples of copper compounds include copper sulfate; copper halides such as copper chloride and copper bromide; copper nitrate; copper salts of formic acid or carboxylic acids; copper salts of oxalic acid and suberic acid; copper salts of hydroxycarboxylic acids such as glycolic acid, lactic acid, tartaric acid, malic acid or citric acid; as well as copper chlorophyllin or its salts, copper benzoate, copper gluconate, copper phytate, copper glycerophosphate, copper propionate, and copper salicylate. Of these, copper chlorophyllin or its salts and copper gluconate are preferred because they do not significantly affect the flavor of the oral composition.

[0038] Copper chlorophyllin or its salts include not only copper chlorophyllin but also pharmaceutically acceptable salts of copper chlorophyllin. These are known and can be manufactured by known methods, or commercially available products can be used. Preferred examples of copper chlorophyllin or its salts include alkali metal salts of copper chlorophyllin, such as copper chlorophyllin sodium and copper chlorophyllin potassium.

[0039] (c) The copper compound content in the oral composition according to this embodiment is preferably 0.000001 to 0.1 w / v%, more preferably 0.00001 to 0.01 w / v%, and even more preferably 0.0001 to 0.005 w / v%. (c) When the copper compound content is above the lower limit, the effect of suppressing color change is better, and when it is below the upper limit, it is less likely to affect the flavor of the oral composition.

[0040] <Oral composition> In the oral composition according to this embodiment, the mass-based content ratio of (b) pigment to (a) fragrance component having an aldehyde group ((b) pigment / (a) fragrance component having an aldehyde group) is preferably 0.0001 to 0.1, more preferably 0.0005 to 0.05, and even more preferably 0.001 to 0.01. This range makes it easier to achieve the effects of the present invention.

[0041] In the oral composition according to this embodiment, the mass-based content ratio of (c) copper compound to (a) fragrance component having an aldehyde group ((c) copper compound / (a) fragrance component having an aldehyde group) is preferably 0.001 to 10, more preferably 0.01 to 1.

[0042] With respect to the agent according to this embodiment, it is preferable to apply the agent according to this embodiment to the oral composition such that the ratio by mass of (c) copper compound in the agent according to this embodiment to (a) fragrance component having an aldehyde group in the oral composition ((c) copper compound / (a) fragrance component having an aldehyde group) is preferably 0.001 to 10, more preferably 0.01 to 1.

[0043] With regard to the method according to this embodiment, it is preferable to incorporate the (c) copper compound into the oral composition such that the ratio of the (c) copper compound to the (a) fragrance component having an aldehyde group, on a mass basis ((c) copper compound / (a) fragrance component having an aldehyde group), is preferably 0.001 to 10, more preferably 0.01 to 1.

[0044] The effects of the present invention are more easily achieved when the ratio of (c) copper compound by mass to (a) fragrance component having an aldehyde group ((c) copper compound / (a) fragrance component having an aldehyde group) is within the above range.

[0045] In the oral composition according to this embodiment, the mass-based content ratio of (c) copper compound to (b) dye ((c) copper compound / (b) dye) is preferably 0.001 to 100, more preferably 0.05 to 50, and even more preferably 0.1 to 10.

[0046] With respect to the agent according to this embodiment, it is preferable to apply the agent according to this embodiment to the oral composition such that the ratio by mass of the copper compound (c) in the agent according to this embodiment to the dye (b) in the oral composition ((c) copper compound / (b) dye) is preferably 0.001 to 100, more preferably 0.05 to 50, and even more preferably 0.1 to 10.

[0047] With regard to the method according to this embodiment, it is preferable to incorporate the copper compound (c) into the oral composition such that the mass-based ratio of the copper compound (c) to the dye (b) in the oral composition ((c) copper compound / (b) dye) is preferably 0.001 to 100, more preferably 0.05 to 50, and even more preferably 0.1 to 10.

[0048] The effects of the present invention are more easily achieved when the mass-based ratio of (c) copper compound to (b) dye ((c) copper compound / (b) dye) is within the above range.

[0049] The oral composition according to this embodiment may optionally contain other components that can be incorporated into an oral composition, as long as they do not inhibit the effect. Examples of optional components include solvents, solubilizers, detergents, sweeteners, disinfectants, surfactants, anti-inflammatory agents, tartar preventatives, pH adjusters, enzymes, ion sources, preservatives, fragrances, herbal medicines, viscosity modifiers, and dentin hypersensitivity inhibitors.

[0050] Examples of solvents include water such as purified water and deionized water; physiological saline solution; lower monohydric alcohols such as ethanol; and polyhydric alcohols such as glycerin, propylene glycol, and polyethylene glycol.

[0051] Examples of sweeteners include stevioside, rebaudioside, xylitol, erythritol, maltitol, sorbitol, sodium saccharin, sucralose, trehalose, reduced palatinose, aspartame, and acesulfame potassium.

[0052] Examples of disinfectants include benzalkonium chloride, benzethonium chloride, cetylpyridinium chloride, hinokitiol, triclosan, isopropylmethylphenol, thymol, and alkyldiaminoethylglycine hydrochloride solution.

[0053] Examples of surfactants include nonionic surfactants, cationic surfactants, anionic surfactants, and amphoteric surfactants. Specifically, examples of nonionic surfactants include glycerin fatty acid esters, sucrose fatty acid esters, sorbitan fatty acid esters, polyoxyethylene fatty acid esters, polyoxyethylene sorbitan fatty acid esters, fatty acid diethanolamides, fatty acid monoglycerides, polyoxyethylene alkyl ethers, polyoxyethylene hydrogenated castor oil, alkyl glucosides, polyoxyethylene polyoxypropylene block copolymers, and polyoxyethylene alkylamines. Examples of cationic surfactants include polyoxyethylene alkylamines and fatty acid amides. Examples of anionic surfactants include sulfate ester salts such as polyoxyethylene lauryl ether sulfate triethanolamine, α-olefin sulfonates, sulfosuccinates, N-acyl amino acid salts, and acylated methyl taurate salts. Examples of amphoteric surfactants include betaine acetate type amphoteric surfactants such as alkyl hydroxysulfobetaine and imidazoline type amphoteric surfactants.

[0054] Examples of anti-inflammatory agents include tranexamic acid, glycyrrhizic acid and its salts, aminocaproic acid, allantoin and its derivatives, ascorbic acid and its salts, azulene, azulene sulfonate, dihydrocholesterol, epidihydrocholesterol, tocopherol acetate, tocopherol nicotinate, and lysozyme chloride.

[0055] Examples of tartar prevention agents include phosphates, polyphosphates, methoxyethylene maleic anhydride copolymers, zinc chloride, and zinc organic acids.

[0056] Examples of pH adjusting agents include monosodium phosphate, disodium phosphate, sodium citrate, citric acid, glucono-δ-lactone, sodium gluconate, sodium acetate, sodium carbonate, sodium bicarbonate, sodium hydroxide, and their hydrates.

[0057] Examples of enzymes include proteases, dextranases, amylases, mutanases, and lysozyme.

[0058] Examples of ion sources include fluoride ion sources such as sodium fluoride, monofluorophosphate, and stannous fluoride, and calcium ion sources such as calcium phosphate, calcium gluconate, and hydroxyapatite.

[0059] Examples of preservatives include parahydroxybenzoic acid esters, sodium benzoate and its salts, potassium sorbate, and phenoxyethanol.

[0060] As for the fragrance, known fragrances such as natural or synthetic ones can be used.

[0061] As for the crude drugs, known crude drugs can be used.

[0062] Examples of viscosity modifiers include cellulose derivatives such as sodium carboxymethylcellulose, hydroxyethylcellulose, hydroxypropylcellulose, and hydroxypropylmethylcellulose; gums such as propylene glycol alginate, xanthan gum, tragacanth gum, karaya gum, arabic gum, carrageenan, and guar gum; and synthetic binders such as polyvinyl alcohol, sodium polyacrylate, carboxyvinyl polymer, and polyvinylpyrrolidone.

[0063] Examples of agents that suppress hypersensitivity include potassium nitrate, aluminum lactate, and strontium chloride.

[0064] The oral composition according to this embodiment, the oral composition after incorporating the agent according to this embodiment into the oral composition, and the oral composition after incorporating (c) the copper compound into the oral composition in the method according to this embodiment exhibit suppressed color changes and can therefore be applied to various oral products that incorporate pigments to differentiate products or enhance product value. For example, it can be used in various dosage forms such as liquid formulations like mouthwash, liquid toothpaste, oral fresheners, gargles, and liquid toothpaste, semi-solid formulations like toothpaste, and solid formulations like lozenges, tablets, and chewing gum. These various formulations can be manufactured by known means.

[0065] Of these, the effects of the present invention are particularly easily obtained when the formulation is in liquid form. In this specification, a liquid formulation means a formulation in which water is the most abundant solvent. In a liquid formulation, for example, the amount of water contained in the solvent is 50 to 95 w / v%. Other solvents such as alcohol may be included in amounts less than water. In a liquid formulation, for example, the amount of alcohol contained in the solvent is 0 to 30 w / v%.

[0066] The oral composition according to this embodiment can be prepared by heating (a) a fragrance component having an aldehyde group, (b) a dye, (c) a copper compound, and optionally other arbitrary components, and stirring and mixing each component uniformly as necessary. The order in which the components are mixed does not matter.

[0067] An oral composition according to the present embodiment can be prepared by heating (a) a fragrance component having an aldehyde group, (b) a dye, and optionally other arbitrary components, and stirring and mixing each component uniformly as necessary. The order in which the components are mixed does not matter.

[0068] <agent> The agent according to this embodiment may consist of (c) a copper compound alone, or it may contain any other component.

[0069] With respect to the agent according to this embodiment, the agent according to this embodiment may be incorporated into an oral composition containing (a) a fragrance component having an aldehyde group and (b) a pigment, or the agent according to this embodiment may be incorporated into an oral composition containing at least one of (a) a fragrance component having an aldehyde group and (b) a pigment, and then the remaining components of the oral composition may be incorporated. After compounding the agent according to this embodiment, it may be heated and stirred to uniformly mix each component, if necessary.

[0070] <Method> With respect to the method according to this embodiment, (a) a fragrance component having an aldehyde group and (b) a pigment may be combined with (c) a copper compound, or (c) a copper compound may be combined with an oral composition containing at least one of (a) a fragrance component having an aldehyde group and (b) a pigment, and then the remaining components of the oral composition may be combined. (c) After blending the copper compound, the mixture may be heated and stirred to ensure uniform mixing of each component, if necessary. [Examples]

[0071] The present invention will be specifically described below with reference to examples, but the present invention is not limited to the following examples unless it exceeds the gist of the invention.

[0072] Each component listed in Table 1 below was stirred at room temperature (approximately 20°C) to mix, dissolve, and solubilize, thereby preparing the oral compositions of Examples 1-3 and Comparative Examples 1-2. In particular, the following products were used for the ingredients listed below. (a) Fragrance components containing an aldehyde group: trans-cinnamaldehyde or citral ·(b) Pigment: Blue No. 1 (c) Copper compounds: Sodium copper chlorophyllin or copper gluconate

[0073] The absorbance (A630) at 630 nm was measured using a spectrophotometer for the oral compositions of Examples 1-3 and Comparative Examples 1-2 immediately after preparation. Note that 630 nm is the maximum wavelength of Blue No. 1.

[0074] Subsequently, the conditions of the lightfastness tester were set as follows, and the oral compositions of Examples 1-3 and Comparative Examples 1-2 were irradiated with light using a xenon weather meter X25 to confirm the effects of ultraviolet light. ·Radiation intensity: 60w / m 2 ·BPT temperature: 63℃ ·Battle temperature: 48℃ ·Battle humidity: 50%RH • Exam duration: 30 hours

[0075] The A630 content of the oral compositions of Examples 1-3 and Comparative Examples 1-2 was measured again using a spectrophotometer after light irradiation. Subsequently, using the A630 values ​​measured before and after light irradiation, the absorbance vs. initial value was calculated based on the following equation (1). Absorbance vs. Initial Value (%) = (Absorbance after light irradiation / Absorbance immediately after preparation) × 100 ... Equation (1)

[0076] [Table 1]

[0077] Data was acquired for n=4, and the absorbance versus initial value was calculated. The results were 93% for Example 1, 88% for Example 2, 91% for Example 3, 84% for Comparative Example 1, and 35% for Comparative Example 2. The results are shown in Figure 1. The vertical axis of Figure 1 is absorbance versus initial value (%).

[0078] In Comparative Example 1, an oral composition containing cinnamaldehyde as a fragrance and not containing (c) a copper compound, the absorbance to initial value was low at 84%, indicating a change in color. In contrast, in Example 1, which contained copper chlorophyllin sodium as the (c) copper compound, the absorbance to initial value was 93%, demonstrating a significant suppression of color change. Furthermore, in Example 3, which used copper gluconate as the (c) copper compound, the absorbance to initial value was 91%, and color change was suppressed in a similar manner to Example 1. Furthermore, in Comparative Example 2, an oral composition containing citral as a fragrance and not containing (c) a copper compound, the absorbance to initial value was low at 35%, indicating a change in color tone. In contrast, in Example 2, which contained copper chlorophyllin sodium as (c) a copper compound, the absorbance to initial value was 91%, demonstrating a significant suppression of color tone change.

[0079] Based on the above, the oral compositions of Comparative Examples 1 and 2, which did not contain (c) copper compounds, had low absorbance-to-initial values ​​and underwent color changes, whereas the oral compositions of Examples 1 to 3, which contained (c) copper compounds, had high absorbance-to-initial values, suppressed fading due to ultraviolet light, and suppressed color changes.

Claims

1. An oral composition containing (a) a fragrance component having an aldehyde group, (b) a dye, and (c) a copper compound.

2. The oral composition according to claim 1, wherein the fragrance component having an aldehyde group (a) is at least one of an aromatic aldehyde and a terpene aldehyde.

3. The oral composition according to claim 1 or 2, wherein the (b) dye is a tar dye.

4. The oral composition according to claim 1 or 2, wherein the copper compound (c) is at least one of a salt of copper chlorophyllin and copper gluconate.

5. (c) A copper compound as the active ingredient, A color change inhibitor used to suppress color changes in an oral composition containing (a) a fragrance component having an aldehyde group and (b) a pigment.

6. A method for suppressing color changes in an oral composition containing (a) a fragrance component having an aldehyde group and (b) a pigment, A method for suppressing color change, comprising adding (a) a fragrance component having an aldehyde group and (b) a dye, and (c) a copper compound to the oral composition.

Images