JP5139694B2 - Melanin production inhibitor and topical skin preparation - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a melanin production inhibitor and a skin external preparation used for whitening agents, skin cosmetics and the like. More specifically, the present invention relates to a melanin production inhibitor and an external preparation for skin containing isoquercitrin or hyperin.

  The mainstream of current research on skin whitening maintenance is the development of drugs that can suppress the activation of melanocytes and the synthesis level of melanin pigments.

  Melanin pigments contained in the skin and hair play an important role in protecting the human body (cells) from harmful ultraviolet rays. When exposed to ultraviolet light, melanocytes are activated in the body, and the synthesized melanin pigment is deposited on the skin, causing sunburn, spots and freckles. Melanin pigments are synthesized in special cells called melanocytes, stored in melanosomes around the nucleus, and then move to the cell membrane along the microtubules and actin fibers that are circulated inside the cell by membrane transport. It is handed over to skin and hair cells (keratinocytes and hair matrix cells). There are the following documents for suppressing such melanin production.

  Patent Document 1 discloses a melanin production inhibitor composed of borneolol-p-hydroxycinnamic ester glycoside.

  Patent Document 2 discloses a melanin production inhibitor comprising a resorcin glycoside such as resorcin maltoside, resorcin cellobioside, resorcin maltotrioside.

  Patent Document 3 is a patent application for finding that β-lactoglobulin separated and purified from milk has a melanin production inhibitory action, and a melanin production inhibitor containing β-lactoglobulin as an active ingredient is disclosed. ing.

  Patent Document 4 discloses a melanin production-suppressing skin external preparation characterized by containing a coumarin derivative having a pigmentation prevention and improvement effect.

  On the other hand, in human genetic diseases, there are known diseases in which this melanin metabolism abnormality occurs and the skin and hair become white. Melanin production promoters are required for such patients. Patent Document 5 discloses a melanin production promoter composed of a flavonoid having at least one of a flavone skeleton, a flavonol skeleton, a flavan skeleton, a flavonanol skeleton, and an isoflavone skeleton.

As described above, various types of compounds are known to have an inhibitory effect on melanin production. Further, there are references that the flavone skeleton, flavonol skeleton, flavan skeleton, flavonanol skeleton and the like have a melanin production promoting action. Many melanin production inhibitors are unstable. In addition, there is a risk of skin irritation, and the emergence of a stable and safe compound having a melanin production inhibitory effect is desired.
JP 09-124442 A JP-A-10-194951 JP-A-10-218755 Japanese Patent Laid-Open No. 11-021226 JP 2004-002264 A

  As described above, various melanin production inhibitors and whitening cosmetics have been reported, but a substance that is still sufficiently stable and has a safe melanin production inhibitory effect has not been obtained. In order to obtain a stable and safe substance having an inhibitory action on melanin production, a search was conducted.

  As a result of intensive studies in order to obtain a stable and safe melanin production inhibitory substance, it was found that the following compounds have a stable and safe melanin production inhibitory action.

  The first feature of the present invention is a melanin production inhibitor characterized by containing isoquercitrin represented by the following chemical formula 1.

Chemical formula 1

The second feature of the present invention is a melanin production inhibitor characterized by containing hyperin represented by the following chemical formula 2.

Chemical formula 2


A third feature of the present invention is that for external use of skin, comprising one or two of the melanin production inhibitors according to claim 1 or 2 in an amount of 0.0001 to 10% by weight based on the total amount. It is an agent.

  Isoquercitrin or hyperin suppresses melanin production and has the effect of eradicating the deposition of melanin pigments produced by ultraviolet rays, etc., and cosmetics containing this have excellent whitening effects, sunburn, etc. It has preventive and therapeutic effects, is highly safe and useful.

  The melanin production inhibitor and the skin external preparation characterized by containing isoquercitrin or hyperin of the present invention contain 0.00001 to 10% by weight, preferably 0, in the formulation of the above isoquercitrin or hyperin. 0.001 to 5% by weight is blended. Furthermore, the melanin production inhibitor and skin external preparation of the present invention include various optional components used in normal cosmetics, quasi drugs, pharmaceuticals, etc., such as oils, aqueous components, surfactants, in addition to the above compounds. Alcohols, moisturizers, thickeners, preservatives, pigments, powders, pH adjusters, medicinal ingredients, UV absorbers, antioxidants, chelating agents, anti-inflammatory agents, whitening agents, fragrances, etc. Can do.

  Specific examples of the oil include liquid paraffin, petrolatum, paraffin wax, squalane, beeswax, carnauba wax, olive oil, lanolin, higher alcohol, fatty acid, higher alcohol and fatty acid synthetic ester, and silicone oil. Examples of the humectant include sorbitol, xylitol, glycerin, maltitol, propylene glycol, sodium pyrrolidonecarboxylate, polyethylene glycol, 1,3-butylene glycol, lactic acid, sodium lactate and the like.

  Examples of the thickener include water-soluble polymers such as carboxyvinyl polymer, carboxymethylcellulose, polyvinyl alcohol, carrageenan, and gelatin, and electrolytes such as sodium chloride and potassium chloride. Examples of the preservative include methyl paraben, ethyl paraben, propyl paraben, butyl paraben, sodium benzoate and the like. Non-ionic surfactants such as polyoxyethylene alkyl ether, polyoxyethylene fatty acid ester, glycerin fatty acid ester, polyglycerin fatty acid ester, polyoxyethylene glycerin fatty acid ester, polyoxyethylene hydrogenated castor oil, polyoxyethylene sorbitol fatty acid ester Surfactants and the like.

  Examples of the powder include talc, sericite, mica, kaolin, silica, bentonite, vermiculite, zinc white, mica, mica titanium, titanium oxide, magnesium oxide, zirconium oxide, barium sulfate, bengara, iron oxide, ultramarine, and the like. Examples of the pH adjuster include a buffer such as citric acid-sodium citrate. Examples of medicinal ingredients include allantoin, vitamin E derivatives, glycyrrhizin, ascorbic acid derivatives, dipotassium glycyrrhizinate, kojic acid, arbutin, panthetinic acid derivatives, placenta extract, anti-inflammatory agents, and animal and plant extracts such as Yokuinin. Thereby, the improvement of the melanin production inhibitory effect can be aimed at. Furthermore, sunburn prevention effect can be improved by mix | blending various ultraviolet absorbers.

  The melanin production inhibitor and the external preparation for skin comprising isoquercitrin or hyperin of the present invention can be produced according to conventional methods. Moreover, although the melanin production inhibitor and skin external preparation used as the object of this invention are useful also as whitening cosmetics, it is not limited to whitening cosmetics, It can utilize also as a pharmaceutical, a quasi-drug, etc. The dosage form can be arbitrarily selected according to the purpose, such as ointment, cream, emulsion, lotion, foundation, pack, bath preparation, lotion, gel, solution, stick and the like.

Melanin Production Inhibitory Action Mouse B16 melanoma cells 5 × 10 ⁴ cells / ml, DMEM medium (1 ml) was added to a 24-well plate, and cultured at 37 ° C. for 24 hours under a CO ₂ / O ₂ mixed gas. A sample solution of a mixture of isoquercitrin and hyperin (1: 1) was added to the cells so that the final concentration was 5 to 50 μg / ml, and the mixture was maintained at 37 ° C. for 3 days under a CO ₂ / O ₂ mixed gas. Cultured. Cells treated with a mixture of isoquercitrin and hyperin were washed twice with PBS, 150 μl of 2N NaOH was added, and the cells were lysed by heating at 65 ° C. for 60 minutes. The results of measuring the lysate at an absorbance of 470 nm are shown in FIG. A mixture of isoquercitrin and hyperin (1: 1) was found to suppress melanin production from 5 μg / ml.

  At the same time, the cell lysate was neutralized with 2N NaCl, and then the protein amount was measured by the Raleigh method.

Intracellular melanin production Mouse B16 melanoma cells 5 × 10 ⁴ cells / ml, DMEM medium (1 ml) was added to a 24-well plate and cultured at 37 ° C. for 24 hours under a CO ₂ / O ₂ mixed gas. A sample solution of isoquercitrin or hyperin was added to the cultured cells so that the final concentration was 10 μg / ml. As a control, the solvent DMSO or kojic acid (final concentration 10 μg / ml) was added. Cells to which each sample was added were cultured at 37 ° C. for 3 days under a CO ₂ / O ₂ mixed gas. After culturing, the cells were washed twice with PBS, 150 μl of 2N NaOH was added, and the cells were lysed by heat treatment at 65 ° C. for 60 minutes. The result of measuring the lysate with absorbance at 470 nm is shown in FIG. Isoquercitrin and hyperin were found to significantly suppress melanin production. It was also found that the effect was stronger than the control kojic acid.

Influence on cell proliferation Isoquercitrin or hyperin was added to cultured cells to a final concentration of 10 µg / ml, and the effects of isoquercitrin and hyperin on cell proliferation were examined. As a result, as shown in FIG. 3, a slight decrease in the number of cells was observed with kojic acid having an inhibitory effect on melanin production. There was no difference from the solvent addition group.

Intracellular protein expression level of tyrosinase Mouse B16 melanoma cells 5 × 10 ⁴ cells / ml, 1 ml of DMEM medium was added to a 24-well plate and cultured at 37 ° C. for 24 hours under CO ₂ / O ₂ mixed gas. To the cultured cells, a mixture of isoquercitrin and hyperin (1: 1) was added to the sample solution to a final concentration of 5 to 50 μg / ml, and the mixture was incubated at 37 ° C. under a CO ₂ / O ₂ mixed gas. Cultured for days. Cells treated with a mixture of isoquercitrin and hyperin were washed twice with PBS and the cells were solubilized using RIPA buffer. From the obtained solubilized fraction, proteins were separated by SDS-PAGE, and then the intracellular protein expression levels of tyrosinase and β-actin were examined by Western blotting using antibodies.

  As a result, as shown in FIG. 4, no change was observed in the protein expression level of β-actin, but the protein expression level of tyrosinase was clearly reduced by the addition of a mixture of isoquercitrin and hyperin.

Whitening Cream A whitening cream containing isoquercitrin and hyperin having an inhibitory action on melanin production of the present invention was prepared according to the following formulation. The blending amount and blending ratio of isoquercitrin or hyperin are not limited to the following prescriptions, and isoquercitrin or hyperin may be formulated independently, respectively, and the blending amount can be adjusted as appropriate. .

Composition%
Glycerol monostearate 5.0
Polyethylene glycol monostearate 2.0
Squalane 8.0
Stearyl alcohol 5.0
Glyceryl trioctanoate 8.0
Dimethylpolysiloxane (50cs) 0.5
Glycerin 5.0
Citric acid 0.5
Sodium citrate 0.5
Isoquercitrin 0.5
Hyperin 0.5
6-amino-n-caproic acid 0.5
Remaining amount of purified water Preservative Appropriate amount Perfume Appropriate amount

FIG. 1 shows the melanin production inhibitory effect of a mixture of isoquercitrin and hyperin (1: 1). FIG. 2 shows the effects of isoquercitrin and hyperin on the amount of intracellular melanin. FIG. 3 shows the effect of isoquercitrin and hyperin on cell proliferation. FIG. 4 shows the effect of a mixture of isoquercitrin and hyperin (1: 1) on tyrosinase and β-actin protein expression levels.

Claims (2)

The melanin production inhibitor characterized by containing the hyperin represented by following Chemical formula 2.

Chemical formula 2
An external preparation for skin, comprising 0.0001 to 10% by weight of the melanin production inhibitor according to claim 1 with respect to the total amount.