JPH06263623A - Natural ultraviolet absorber and cosmetic containing it - Google Patents

Abstract

PURPOSE:To provide an ultraviolet absorber obtained from a natural extract and a suntan cosmetic containing it. CONSTITUTION:The natural ultraviolet absorber consisting of plural kinds of materials extracted from sea weeds or terrestrial plants. The cosmetic containing natural ultraviolet absorber is produced by compounding single or plural kinds of ultraviolet absorbers extracted from sea weeds or terrestrial plants with cosmetic base to make SPF >=2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a natural ultraviolet absorbing substance extracted from seaweed or terrestrial plants and cosmetics containing the same.

[0002]

2. Description of the Related Art Ultraviolet rays are known to have many effects on the skin. For example, it is said that the acute effect is sunburn, and in the long term, it is closely related to skin aging (photoaging) such as spots and wrinkles, and skin cancer.

Generally, sunburn includes sunburn and suntan. Sunburn is mainly UVB (290-320
The red inflammation of the skin (a kind of burn condition, called erythema) caused by medium-wave ultraviolet rays, which is called "nm"), causes sunburn to transfer to suntan after a few days. Suntan activates melanin by exposing it to ultraviolet rays, which makes the skin black. Suntan is a biological defense reaction that seeks to block UV rays by blackening the skin. U on the suntan
There is temporary blackening due to VA (320 to 400 nm) and secondary blackening shifting from sunburn.

Therefore, the aging of the skin due to ultraviolet rays includes spots due to the deposition of melanin, wrinkles and sagging due to the destruction of the freckles and the fibrous tissue of the dermis layer, and UVA and UV.
Both B are said to be the cause. On the other hand, skin cancer is more likely to occur in exposed areas, areas with strong sunlight near the equator, people who work outdoors, and people with white skin (low melanin that protects from UV rays), and UV rays can cause skin cancer. Has been demonstrated in animal studies. It is also said that ultraviolet rays cause damage to DNA and decrease immunity.

In recent years, due to the destruction of the ozone layer, UVC (200 to 290 nm), which is the most harmful of the ultraviolet rays, which has never reached the surface of the earth, reaches the surface, which is a problem. There is. The amount of UVB reaching the surface is also increasing.

[0006] As described above, there are various effects of ultraviolet rays on the skin, and there is a sufficient need to protect the ultraviolet rays. Actually, skin care cosmetics are available on the market, but their UV protection ability is provided by synthetic products.

[0007]

SUMMARY OF THE INVENTION Since the conventional ultraviolet ray protective cosmetics contain a synthetic ultraviolet ray absorbing substance, they may be easily oxidized and deteriorated to adversely affect the skin.

However, since the antioxidant added to prevent oxidation is also a chemical product, there is a problem in that it also adversely affects the skin.

[0009]

SUMMARY OF THE INVENTION However, according to the present invention, since an ultraviolet absorbing substance composed of an extract of seaweed or a terrestrial plant is mixed into cosmetics, the extract not only has an antioxidant function but also absorbs ultraviolet rays. Since it also has a defense ability, it solves the above-mentioned conventional problems.

The ultraviolet absorbing substance of the present invention can be obtained by extracting a sample with a suitable solvent.

As the extraction solvent, in addition to water, organic solvents such as alcohols and acetone, which are soluble in water, aromatic hydrocarbons such as benzene and toluene, and halogens of aliphatic hydrocarbons such as chloroform and carbon tetrachloride. Compound and the like. Further, ethers, esters, ketones and the like are used.

The cosmetics according to the invention are used for creams, lotions, oils, foundations (both sunburns and sunscreens) and for hair care.

That is, the invention of the ultraviolet absorbing substance is a natural ultraviolet absorbing substance characterized by comprising a plurality of species extracted from seaweed or terrestrial plants. In another invention, seaweeds are green algae, brown algae and red algae, and terrestrial plants are γ-oryzanol and licorice. Next, in the invention of cosmetics, one or more kinds of ultraviolet absorbing substances extracted from seaweed or terrestrial plants are mixed into cosmetics to obtain SPF2.
The present invention is a cosmetic containing a natural UV absorbing substance characterized by the above, and another invention is one in which one or more kinds of UV absorbing substances extracted from seaweed or terrestrial plants and a synthetic UV absorbing substance are mixed to obtain SPF 2 or more. The present invention is a cosmetic containing a natural ultraviolet absorbing substance.

As the seaweed in the above, green algae (for example, mill, sea lettuce, sea squirrel), brown algae (for example, Ezo shige, kelp, wakame, hijiki, hondawara, isomoku)
And red algae (for example, Prickly Pear paste, Agar beetle, Red pearl hemlock, Benmozuku, Ushikenori).

The land plants include γ-oryzanol, aloe, chamomile, licorice and the like.

The SPF value in the above means the ability to cut the medium wavelength region (UVB) which causes inflammation, and the larger the number, the stronger the UVB cutting. In addition, the number is the magnification of the time that inflammation occurs using cosmetics compared to the case of bare skin, so if inflammation occurs in 20 minutes with bare skin, if you use cosmetics and reach up to 40 minutes, It means SPF2.

[0017]

Example 1 1 kg of 50% ethanol to 1 kg of dried Eishige
Add 0 l and perform extraction for 14 days. The obtained extract is concentrated under reduced pressure to obtain 200 g of a concentrate. The concentrated solution was diluted with ethanol to 0.02% and the ultraviolet absorption was examined.

A substance having an absorption maximum around 230 nm was confirmed. It was confirmed that 0.02% of the concentrated liquid had an absorption corresponding to a 0.02% diluted liquid of 2-ethylhexyl paradimethylaminobenzoate (FIG. 1).

That is, when it is used, it may be used in an amount equal to that of 2-ethylhexyl paradimethylaminobenzoate.

[0020]

[Example 2] 10 kg of 50% ethanol was added to 1 kg of dried red scallions and extraction was carried out for 14 days. The obtained extract is concentrated under reduced pressure to obtain 200 g of a concentrate. The concentrated solution was diluted with ethanol to 0.02% and examined for ultraviolet absorption.

A substance having an absorption maximum around 230 nm and 3
A substance having an absorption maximum around 10 to 330 nm was confirmed. It was confirmed that 0.02% of the concentrated solution had an absorption corresponding to a 0.02% diluted solution of 2-ethylhexyl paradimethylaminobenzoate (FIG. 2).

That is, when it is used, it should be used in an amount equal to that of 2-ethylhexyl paradimethylaminobenzoate.

[0023]

Example 3 γ-Oryzanol (white crystal powder) separated and purified from 1 kg of rice bran oil was diluted to 0.03% with ethanol, and the ultraviolet absorption was examined.

A substance showing an absorption maximum in the vicinity of 290 nm and 330 nm but showing absorption in a wide range was confirmed. It was confirmed that the 0.03% diluted solution of γ-oryzanol absorbed the 0.02% diluted solution of 2-ethylhexyl paradimethylaminobenzoate (FIG. 3).

That is, when used, it is sufficient to use 1.5 times the amount of 2-ethylhexyl paradimethylaminobenzoate.

[0026]

Example 4 To 1 kg of dried licorice root, 10 l of ethanol was added, and extraction was carried out under reflux for 5 hours. Concentrate the extract under reduced pressure,
After dry grinding, 30 g of powder are obtained. The purified licorice extract was diluted with ethanol to 0.06%, and the ultraviolet absorption was examined.

A substance having a main absorption maximum around 380 nm, but absorbing in a wide range was confirmed. Licorice extract 0.06% dilution is paradimethylaminobenzoic acid-
Absorption corresponding to a 0.02% dilution of 2-ethylhexyl was confirmed (Fig. 4).

That is, when used, it is sufficient to use 3 times the amount of 2-ethylhexyl paradimethylaminobenzoate.

[0029]

Example 5 The Ezoishige extract obtained in Example 1 and γ-oryzanol obtained in Example 3 were mixed in a ratio of 2: 3, and the mixture was diluted to 0.04% with ethanol to absorb ultraviolet rays. Examined.

Materials having absorption in a wide range of 200 to 340 nm were confirmed. It was confirmed that the 0.04% diluted solution of this mixture had an absorption corresponding to a 0.02% diluted solution of 2-ethylhexyl paradimethylaminobenzoate (FIG. 5).

That is, when used, it is sufficient to use twice the amount of 2-ethylhexyl paradimethylaminobenzoate.

Further, this mixture is a highly useful substance having a pharmacological effect such as anti-inflammatory and an antioxidant, in addition to the ability to absorb ultraviolet rays.

[0033]

Example 6 The licorice extract obtained in Example 4 and 2-ethylhexyl paradimethylaminobenzoate were mixed at a ratio of 3: 1 and diluted with ethanol to 0.04%.
The ultraviolet absorption was examined.

Materials having absorption in a wide range of 200 to 380 nm were confirmed. It was confirmed that the 0.04% diluted solution of this mixture had an absorption corresponding to the 0.02% diluted solution of 2-ethylhexyl paradimethylaminobenzoate (FIG. 6).

That is, when used, it is sufficient to use twice the amount of 2-ethylhexyl paradimethylaminobenzoate.

Further, synthetic ultraviolet absorbers are easily oxidized and have a problem in safety. However, by using a licorice extract, the amount of the synthetic product used can be suppressed and the inflammation of the skin is suppressed by the anti-inflammatory effect. .

[0037]

[Example 7] The red peach extract obtained in Example 2 and 2-ethylhexyl paradimethylaminobenzoate were mixed at a ratio of 1: 1 and the mixture was mixed with ethanol to give 0.0.
Diluted to 2% and examined for UV absorption.

Materials having absorption in a wide range of 200 to 340 nm were confirmed. It was confirmed that the 0.02% diluted solution of this mixture had an absorption corresponding to the 0.02% diluted solution of 2-ethylhexyl paradimethylaminobenzoate (FIG. 7).

That is, when it is used, it may be used in the same amount as that of 2-ethylhexyl paradimethylaminobenzoate.

Further, the synthetic ultraviolet absorber is easily oxidized, but the ultraviolet absorbing power is enhanced by adding seaweed. In addition, a substance that is difficult to oxidize can be obtained due to its antioxidant effect.

[0041]

[Embodiment 8] When 5% of the red velvet extract as described in Embodiment 2 is added to the skin cream of the general formula, S
A sunscreen skin cream equivalent to PF6 is produced.

When 2-ethylhexyl paradimethylaminobenzoate is mixed in cosmetics, the standard is about 3% SPF4 (sunscreen cosmetics), and 5% is SPF6 (sunscreen cosmetics). is there.

[0043]

[Example 9] By adding 6% of the licorice extract described in Example 4 to a lotion having a general formulation, a suntan lotion corresponding to SPF3 can be obtained.

[0044]

Example 10 If 3% of γ-oryzanol described in Example 3 is mixed with a skin oil having a general formulation, a suntan oil corresponding to SPF3 can be obtained.

[0045]

[Example 11] By adding 5% of the mixture described in Example 7 to a cream having a general formulation, a sunscreen cream corresponding to SPF6 can be obtained.

[0046]

According to the present invention, since the natural extract is used, the problem when using the synthetic ultraviolet absorbing substance is eliminated. In addition, the ultraviolet absorbing substances contained in the natural extract have antioxidant ability and are relatively stable, and each has a characteristic of absorbing ability (there is a maximum absorbing ability in a certain range). Thus, it is possible to obtain a cosmetic having an average effect over all wavelengths or a cosmetic having characteristics at a selective wavelength. When used in combination with a synthetic ultraviolet absorbing substance, the amount of the synthetic ultraviolet absorbing substance used can be suppressed, the addition of a synthetic antioxidant becomes unnecessary, and the absorbing ability can be promoted.

Further, as compared with the use of the synthetic ultraviolet absorbing substance, the safety to the skin is enhanced, and various effects such as prevention of inflammatory stimulation due to the synthetic ultraviolet absorbing substance are obtained.

[Brief description of drawings]

FIG. 1 is a graph of the absorbance of Ezo shige (Example 2) of the present invention (0.02% solution).

FIG. 2 is a graph (0.02% solution) of the absorbance of the red bud plant of Example 2 as well.

FIG. 3 is a graph of the absorbance of γ-oryzanol of Example 3 (0.03% solution).

FIG. 4 is a graph showing the absorbance of licorice of Example 4 (0.
06% solution).

FIG. 5 is a graph of the absorbance of the mixture of Example 5 (0.04% solution).

FIG. 6 is a graph of absorption luminosity of the mixture of Example 6 (0.04% solution).

FIG. 7 is a graph of the absorbance of the mixture of Example 7 (0.02% solution).

FIG. 8 is a graph of the absorbance of a conventionally known 2-ethylhexyl paradimethylaminobenzoate (0.02% solution).

Claims (5)

[Claims] 1. A natural ultraviolet absorbing substance comprising a plurality of species extracted from seaweed or terrestrial plants. 2. The natural ultraviolet absorbing substance according to claim 1, wherein the seaweed is green algae, brown algae or red algae. 3. A terrestrial plant comprising γ-oryzanol, aloe,
The natural ultraviolet absorbing substance according to claim 1, which is chamomile or licorice. 4. An SPF containing one or more kinds of ultraviolet absorbing substances extracted from seaweed or terrestrial plants in a cosmetic composition.
A cosmetic containing a natural ultraviolet-absorbing substance, characterized in that the number is 2 or more. 5. A cosmetic containing a natural ultraviolet absorbing substance, wherein one or more kinds of ultraviolet absorbing substances extracted from seaweed or terrestrial plants and a synthetic ultraviolet absorbing substance are mixed to obtain SPF of 2 or more.