JPH08133940A - Ultraviolet absorbing agent and cosmetic containing the same - Google Patents

Abstract

PURPOSE: To obtain an ultraviolet absorbing agent containing neosakuranin existing in the bark of cherry tree as an active component, exhibiting excellent ultraviolet absorbing action in both ultraviolet A and B regions and having high safety and to prepare a cosmetic containing the absorbing agent. CONSTITUTION: This ultraviolet absorbing agent composed of neosakuranin is produced e.g. by adding 1-20 pts. of a polar solvent to 1 pt. of the bark of cherry tree and extracting at room temperature or by heating at a temperature near the boiling point of the solvent. A cosmetic having excellent effect to protect the skin from ultraviolet rays can be produced by compounding the ultraviolet absorbing agent. The amount of the ultraviolet absorbing agent to be compounded to the cosmetic is preferably 0.1-5wt.%. Neosakuranin has absorptions in both ultraviolet A and B regions. The percent absorption of the absorption peak (at 370nm) in the ultraviolet A region is as high as 700 and the agent is suitable as an ultraviolet absorbing agent. The cherry is e.g. Yoshino cherry, Japanese hill cherry or Oshima cherry (Prunus larmesiana). Above all, Oshima cherry is preferable because of its high neosakuranin content. The cosmetic is continuously usable over a long period.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ultraviolet absorber and a cosmetic containing the same, and more particularly to an ultraviolet absorber containing neosacranin and a cosmetic containing the same, which is excellent in skin protection effect from ultraviolet rays.

[0002]

2. Description of the Related Art In recent years, due to the risk of inflammation and induction of skin cancer, consumers have been conscious of protecting the skin from UV rays, especially UV rays B. Furthermore, ultraviolet rays A
It was pointed out by many academic societies that this is not preferable in terms of safety, and the need for protection against this was emphasized.

Under these circumstances, in the field of cosmetics, as a method of protecting against ultraviolet rays, a method of scattering ultraviolet rays by compounding a cosmetic with a masking agent such as titanium oxide, Benzophenone derivative,
A method has been used in which an ultraviolet absorber such as a cinnamic acid derivative or a paraaminobenzoic acid derivative is mixed with cosmetics so that the ultraviolet rays are absorbed by the cosmetics before they reach the skin.

However, in the case of protection due to scattering by titanium oxide, if a titanium oxide in an amount effective for protection is added, the appearance color of the titanium oxide is affected and the color becomes abnormally white. Even if it was colored, the finish would be thick and could give an unnatural feeling to others. In addition, conventional UV absorbers have many safety problems such as suspected causative substances of delayed-type allergy. Further, any of the ultraviolet absorbers up to now can absorb ultraviolet B but have no effect of absorbing ultraviolet A, and therefore cannot protect against ultraviolet A at all, and it cannot be said that the ultraviolet protective effect is sufficient.

On the other hand, neosacranin is a known substance,
It is a compound that is known to exist in the bark of cherry blossoms, but it is not known that this compound has a UV-absorbing effect, and it has been incorporated into cosmetics to protect the skin from UV rays. There are no known reports of attempts.

[0006]

SUMMARY OF THE INVENTION The present invention has been made from the above viewpoints, and an ultraviolet absorber excellent in the action of absorbing both ultraviolet rays A and ultraviolet rays B, and further excellent in safety, and An object of the present invention is to provide a cosmetic having an excellent action of protecting the skin from the contained ultraviolet rays.

[0007]

In order to solve the above-mentioned problems, the inventors of the present invention searched various organic compounds for substances having strong absorption in the ultraviolet A and B regions using the ultraviolet absorption spectrum as an index. It has been found that neosacranin represented by the general formula (I) has an excellent absorbing action in both the ultraviolet rays A and B regions, and is also excellent in safety,
Further, they have found that a cosmetic containing the same has an excellent action of protecting the skin from ultraviolet rays, and completed the present invention.

That is, the present invention is an ultraviolet absorber consisting of neosacranin represented by the following general formula (I) and a cosmetic containing the same.

[0009]

Embedded image

<1> Ultraviolet Absorber of the Present Invention The ultraviolet absorber of the present invention comprises neosacranin represented by the general formula (I).

It is known that the above-mentioned neo-Sacranin is present at a high concentration in the bark of the cherry tree which is a plant of the Rosaceae family, and is widely present in all species of the cherry tree. So, as the cherry tree used as the source plant of Neo-Sacranin,
Any type of cherry can be used as long as it is not particularly limited. For example, Yoshino cherry, Yamazakura, Oshimazakura, etc. are preferable, and among these, Oshimazakura with the highest content of neo-Sakuranin is more preferable.

[0012] A method for obtaining neo-Sacranin from the bark of Sakura is, for example, 1 to 20 times the amount of a polar solvent is added to the bark of Sakura, and extraction may be performed by heating at room temperature or a temperature near the boiling point of the solvent. At this time, the bark of the raw material, cherry bark, may be used as it is, or may be used after being subjected to pretreatment such as drying, shredding, and crushing. The extraction time is suitable for several days at room temperature and for several hours under heating. After removing the solvent from the extract thus obtained, it is purified by a usual method such as liquid-liquid extraction and column chromatography to obtain neo-Sacranin which is the ultraviolet absorbent of the present invention.

The polar solvent used for the above extraction includes alcohols such as methanol and ethanol, ketones such as acetone and methyl ethyl ketone, ethers such as diethyl ether and tetrahydrofuran, halogenated hydrocarbons such as chloroform and methylene chloride. Preferred examples thereof include esters such as ethyl acetate and methyl formate, nitriles such as acetonitrile, water and the like. Moreover, these polar solvents may be used individually by 1 type, and may mix and use several types.

Neo-Sacranin thus obtained is
It has absorption in both ultraviolet A and B regions, and in particular, it has a high% absorbance coefficient of 700 at the absorption maximum (370 nm) in the ultraviolet A region, which is suitable as the ultraviolet absorber of the present invention.

<2> Cosmetic of the present invention The cosmetic of the present invention contains the above ultraviolet absorber. The preferable blending amount of the ultraviolet absorber in the cosmetic of the present invention is 0.01 to 10% by weight,
It is more preferably 5% by weight. If the blending amount of the UV absorber is less than 0.01% by weight, it cannot be said that the UV absorbing ability is sufficient and the effect of protecting the skin from UV rays may be insufficient. However, the effect may reach the ceiling and may not be economical. Further, the range of the amount of the ultraviolet absorber compounded, which has a remarkable effect of protecting the skin from ultraviolet rays and is economically advantageous, is the above-mentioned more preferable range of the compounded amount, that is, 0.1 to 5% by weight.

In the cosmetic of the present invention, in addition to the above-mentioned ultraviolet absorber, various optional components usually used in cosmetics, for example,
Hydrocarbons such as petrolatum, squalane, liquid paraffin, esters such as jojoba oil, carnauba wax, synthetic gay wax, beeswax, olive oil, hydrogenated coconut oil, castor oil, triglycerides such as beef tallow, cetyl alcohol, oleyl alcohol, behenyl alcohol , Higher alcohols such as batyl alcohol, higher fatty acids such as stearic acid and oleic acid, nonionic surfactants such as stearic acid monoglyceride and polyoxyethylene hydrogenated castor oil, anionic surface active agents such as sodium lauryl sulfate and sulfosuccinate Agents, cationic surfactants such as alkylamine hydrochloride, amphoteric surfactants such as alkylbetaine, polyhydric alcohols such as glycerin and 1,3-butanediol, lower alcohols such as ethanol and propanol, Preservatives such as benzene and chlorhexidine gluconate, antioxidants such as vitamin E and butylhydroxytoluene, thickeners such as guar gum, gum arabic, carboxyvinyl polymer, moisturizers such as polyethylene glycol, alkalis and phosphates. , Citrate,
PH adjusting agents such as acetate, titanium oxide, red iron oxide, yellow iron oxide, talc, powders such as silica gel, fragrances, pigments, etc.
Hyaluronic acid, placenta extract, ginseng extract, sterol glycoside, and other medicinal components suitable for various purposes are appropriately selected and mixed.

Further, the cosmetic of the present invention may contain an ultraviolet absorber or an ultraviolet protector other than the ultraviolet absorber neosacranin. Examples of such components include benzophenone derivatives and aminobenzoic acid. Derivative,
Examples thereof include a cinnamic acid-derived ultraviolet absorber and an inorganic powder such as titanium oxide and zinc oxide having an action of scattering ultraviolet rays.

The dosage form of the cosmetic of the present invention is not particularly limited, but basic cosmetics such as cream, milky lotion, lotion and the like which are applied to the skin are preferable. Moreover, you may mix | blend with makeup cosmetics, such as eye color, cheek color, foundation, and undermakeup. These can be produced in the same manner as in ordinary cosmetics, except that neosacranin, which is the ultraviolet absorber of the present invention, is added.

[0019]

EXAMPLES Examples of the present invention will be described below. First,
Examples of the ultraviolet absorbent of the present invention will be described.

[0020]

Example 1 Production of Neo-Sacranin To 5 g of methanol was added to 800 g of bark of Japanese cherry tree, and the mixture was heated under reflux for 3 hours. The obtained extract was filtered to remove insoluble matter, and then the extract solvent was removed from the filtrate by concentration under reduced pressure. Chloroform and water (1 L) were added to the obtained concentrate to perform liquid-liquid extraction, and then only the chloroform layer was taken out. Chloroform was removed from this solution, and 1 L each of normal butanol and water were further added to the residue, liquid-liquid extraction was performed, and only the normal butanol layer was taken out from this. Normal butanol was removed from this solution, and the resulting crude product was purified by silica gel column chromatography (elution solvent; chloroform: methanol = 100: 0 → 50: 50) to give 47.
1 mg of neosacranin (ultraviolet absorber 1) was obtained.

<Evaluation of Ultraviolet Absorber of the Present Invention> The following three types of tests were conducted on the safety of neosacranin (ultraviolet absorber 1) obtained above.

(1) Dermal Toxicity Test by Guinea Pigs The backs of six Hartley male guinea pigs (300-350 g) were shaved to make 2 × 2 cm sites at 3 sites. One of them was set as an untreated control site, and no operation was performed after shaving. As a vehicle control, 0.05 g of vaseline was applied to one of the remaining two places. The remaining one site was a sample administration site, and 0.05 g of the ultraviolet absorber 1 kneaded in vaseline at a ratio of 10% by weight was applied. Then, 24 hours and 48 hours later, the same specimen was similarly administered to the same site, and 72 hours after the final administration, the skin reaction was evaluated using the following Draize standard.

(Criteria for Draize) −: No reaction ±: False positive reaction +: Positive reaction ++: Reaction with edema

The result was judged as (-), because no skin reaction was observed at any part. From this, it is understood that the ultraviolet absorber of the present invention is excellent in safety.

(2) Allergenicity test with guinea pigs (maximization test) The backs of two groups of 10 male white Hartley guinea pigs were shaved on 10 groups and the shaving site was damaged by applying a 1% sodium lauryl sulfate aqueous solution. After that, one part of the damaged part was kneaded with UV absorber 1 in vaseline at a ratio of 1% by weight, and the other part of the damaged part was only vaseline as a vehicle control group. 48 for each
Time closed patch.

24 hours and 72 hours after the end of the closed patch treatment, guinea pigs of each group were subjected to the closed patch site, and to the ultraviolet absorber-containing petrolatum-administered group,
10% DMSO saline solution containing 1% by weight of UV absorber 1, Freund's complete adjuvant (FC
A) 10% DM containing 2% by weight of UV absorber 1
1: 1 mixed emulsion of SO saline solution and FCA,
Vehicle control group, 10% DMSO saline solution, FCA, 10% DMSO saline solution and FC
The 1: 1 mixture of A was injected intradermally at 2 sites each, for a total of 6 sites. After a 10-day rest period after injection, a 24-hour closed patch was performed to observe the evoked response. The concentration of the ultraviolet absorber 1 was 1% by weight and 0.
1% by weight, and vaseline was used as the vehicle. Skin reactions were observed 1 and 24 hours after removal of the closed patch using the Draize criteria above.

As a result, no reaction (-) was observed at any of the test substance administration sites.
It was revealed that the ultraviolet absorber of the present invention has no allergenicity.

(3) Closed-patch test in humans The upper arm inner part of 11 healthy males was used as a test site, and 0.025 g of petrolatum containing ultraviolet absorber 1 at a concentration of 5% by weight was added onto lint cloth. The applied product was closed-patched for 24 hours. After completion of the closed patch, the specimen was removed from the test site, and 1 hour and 24 hours thereafter, the skin reaction was observed using the Japanese patch test criteria shown below as an index.

(Japanese patch test standard) −: No reaction ±: False positive reaction +: Positive reaction ++: Reaction with edema

As a result, the reaction of any panelist at any observation was no reaction (-). From this, it is understood that the ultraviolet absorber of the present invention is excellent in safety. Next, examples of cosmetics containing the ultraviolet absorbent 1 obtained in Example 1 will be described. In addition, the compounding amounts shown below are all parts by weight.

[0031]

Examples 2 and 3 Lotion A lotion was obtained by heating and stirring the prescription components shown in Table 1 at 80 ° C. to solubilize and then cooling.

[0032]

[Table 1]

[0033]

Examples 4 and 5 Cream A component and B component shown in Table 2 were weighed and separately 8
After heating and stirring at 0 ° C., the component B was gradually added to the component A with stirring to emulsify. This was cooled with stirring to obtain a cream.

[0034]

[Table 2]

[0035]

Example 6 Foundation After kneading component A in Table 3, component B was added and further kneading. After heating this at 80 ° C., the component C was added and dispersed, and the component D heated and dissolved at 80 ° C. was gradually added to emulsify and stirred to cool to obtain a foundation.

[0036]

[Table 3]

<Evaluation of Cosmetics of the Present Invention> Using the cream obtained in Example 5 above, the ultraviolet protection effect of the cosmetics of the present invention was evaluated.

Five male panelists were used as subjects. First, SE lamps and BLB lamps were placed on the inside of the lower arm of the subjects at a ratio of 1: 1.
Then, the minimum erythema density (MED) in this mixed color light was determined. Next, 0.025 g of the cream of Example 5 was applied to the inner part of the lower arm of the subject, and M was applied to the part.
Irradiation with the above-mentioned mixed-color light in an amount twice that of ED was performed, and 10 hours and 24 hours after the end of irradiation, the skin inflammatory reaction was observed based on the Japanese patch test standard.

The results showed that there was no reaction, and that the protection against ultraviolet B was sufficient. Further, blackening of the irradiated site was observed 10 days and 30 days after the light irradiation, but no blackening was observed in any of the sites, indicating that the protection against ultraviolet rays A was sufficient.

[0040]

EFFECT OF THE INVENTION The ultraviolet absorbent of the present invention is excellent in the function of absorbing both ultraviolet rays A and B, and is also excellent in safety. In addition, the cosmetics containing the same can protect the skin from ultraviolet rays because they have an ultraviolet absorbing property, and since they are excellent in safety, they can be used continuously for a long period of time.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location C09K 3/00 104 B // C07D 309/10 (72) Inventor Hoji Osato Kanagawa-ku, Yokohama, Kanagawa Takashimadai 27 1-Polar Chemical Industry Co., Ltd. Yokohama Research Laboratory (72) Inventor Satoshi Ohata 27 Takatakadai 27-Polar Chemical Industry Co., Ltd. Yokohama Research Laboratory (72) Inventor Yoshiyuki Miyata 1 Polla Kasei Kogyo Co., Ltd. 1-27 Takashimadai, Kanagawa-ku, Yokohama-shi, Kanagawa (72) Inventor Yoshio Kitada 560 Kashio-cho, Totsuka-ku, Yokohama, Kanagawa Pref. Inventor Takuji Nakajima 560, Kashio-cho, Totsuka-ku, Yokohama-shi, Kanagawa Pola Chemical Industry Co., Ltd. Totsuka Research Institute (72) Inventor Yoshihiro Maki Tokyo Prince City Mejirodai 2-8-5-205 (72) inventor Yutaka Sashida Hachioji, Tokyo Nan'yodai 3-20-7

Claims (3)

[Claims] 1. An ultraviolet absorber comprising neo-sacranin represented by the following general formula (I). Embedded image 2. A cosmetic containing the ultraviolet absorbent according to claim 1. 3. The cosmetic according to claim 2, wherein the content of the ultraviolet absorber is 0.01 to 10% by weight based on the total amount of the cosmetic.