阅读说明：本技术 苦豆酮的制备及在个人护理产品中的应用 (Preparation of alopecurone and application of alopecurone in personal care products ) 是由 沈征武 于 2019-08-16 设计创作，主要内容包括：本发明公开了一种以苦豆子为原料,适宜于工业化制备高纯度苦豆酮的方法：采用该方法制备苦豆酮避免了酸碱处理和层析分离,因而避免了酸碱处理过程中苦豆酮的降解和异构化,提高了化合物的纯度和得率。因此降低了可能的毒性和皮肤刺激性。采用该方法所得到的苦豆酮比已知亮肤剂具有更好的亮肤活性。(The invention discloses a method for industrially preparing high-purity alopecurone by taking sophora alopecuroides as a raw material, which comprises the following steps: the method avoids acid-base treatment and chromatographic separation, thereby avoiding the degradation and isomerization of the alopecurone in the acid-base treatment process and improving the purity and yield of the compound. Thus reducing possible toxicity and skin irritation. The alopecurone obtained by the method has better skin-lightening activity than the known skin-lightening agent.)

1. A preparation method of high-purity alopecurone is characterized by comprising the following steps:

The rhizome of the sophora alopecuroide is firstly crushed into fragments or powder with the average diameter of 0.1-5 mm, and is soaked in 95 percent ethanol for 2-3 days at room temperature; repeating the extraction process for 1 or 2 times; the extracts were combined and concentrated to remove the solvent. Obtaining an oily substance;

the oily matter and three times of 200-300 mesh silica gel are mixed and stirred into solid; placing the solid on a Soxhlet extractor, and washing with a relatively low-polarity organic solvent;

The organic solvent is an aprotic organic solvent or a mixture thereof, such as petroleum ether, n-hexane, diethyl ether, isopropyl ether, ethyl acetate, butyl acetate, acetone, methyl chloride, ethyl chloride, dichloromethane, dichloroethane, acetonitrile, propionitrile, tetrahydrofuran, sulfolane.

Then elution is carried out with a relatively highly polar organic solvent:

The organic solvent is a protic organic solvent or a mixture thereof, such as methanol, ethanol, isopropanol, and the like.

Concentrating, drying and recrystallizing the eluent to obtain the alopecurone.

2. A skin lightening composition characterized in that it comprises:

From 0.001% to 5% by weight of alopecurone, said alopecurone containing the two epimers alopecurone A and alopecurone B.

b. Cosmetically and personal care acceptable carriers.

3. The composition of claim 2, wherein the composition further comprises a sunscreen.

4. A composition according to any one of the preceding claims 2 to 3, wherein the alopecurone comprises 0.001% to 5% of the composition.

5. A process for the preparation according to claim 1, wherein said alopecurone consists of the two epimers alopecurone a and alopecurone B.

6. The method according to claim 2, wherein the composition may comprise the following active compounds:

Alpha-hydroxy acids, beta-hydroxy acids, polyhydroxy acids, hydroquinone, tert-butylhydroquinone, vitamins B and/or C and/or E, retinoids, resorcinol derivatives, vanillic acid, betulinic acid, hydrolyzed milk protein, and mixtures thereof.

7. A composition according to claim 3, wherein the composition may comprise an organic sunscreen agent as follows:

Benzophenone, methoxycinnamate, ethyldihydroxypropyl-PABA, glyceryl-PABA, trimethylcyclohexyl salicylate, methyl anthranilate, 2-ethylhexyl 2-cyano-3, 3-diphenylacrylate, octyldimethyl PABA, octyl methoxycinnamate, octyl salicylate, PABA, 2-phenylbenzimidazole-5-sulfonic acid, TEA salicylic acid, 3- (4-methylbenzylidene) camphor, benzophenone-6, benzophenone-12, 4-isopropyldibenzoylmethane, butylmethoxydibenzoylmethane, ethyl 2-cyano-3, 3-diphenylacrylate, and mixtures thereof.

8. The composition of claim 2, characterized by further comprising hexanol-1-O- α -L-arabinofuranoside (1 → 6) - β -D-glucopyranoside.

9. The composition of claim 8, wherein:

The alopecurone and hexanol-1-O-alpha-L-arabinofuranoside (1 → 6) -beta-D-glucopyranoside are mixed according to the mass ratio of 5: 1.

10. The composition of claim 8, wherein:

The alopecurone and hexanol-1-O-alpha-L-arabinofuranoside (1 → 6) -beta-D-glucopyranoside are mixed according to the mass ratio of 10: 1.

Technical Field

the present invention relates to a process for the preparation of high purity alopecurone and its use as a skin lightening agent for personal care in combination with other active compounds and excipients.

Background

Skin lightening is desirable for many people. To meet these needs, many manufacturers have attempted to develop products to reduce the production of human skin pigments. However, few effective and low-toxic chemicals are currently available to achieve this effect. The use of heavy metal ions such as lead or mercury can be toxic or skin irritating. Therefore, personal care products or cosmetics that utilize natural chemical ingredients to achieve whitening effects are a pursued goal of many consumers.

Japanese patent application JP07-188245A (Mukenazu) relates to compounds contained in "Kukanzo" and useful as MRSA (methicillin-resistant Staphylococcus aureus) antibacterial agents, anticancer active agents, anti-oral bacterial active agents. The compound is alopecurone (Alopecurones) I and/or II, and has a chemical name of 4-hydroxy-2- (4-hydroxyphenyl) -3- (3, 5-dihydroxyphenyl) -7- (2, 4-dihydroxyphenyl) -9- (5-isopropenyl-1-methyl-hex-2-enyl) -5H-2, 3-dihydro (3, 2-g) [1] -6, 7-dihydrobenzopyran-5-one. The compound is extracted with Kukanzo (sophora alopecuroide, pulverized) using a solvent such as acetone, the extract is filtered, the filtrate is concentrated, and separated and purified by column chromatography.

The Chinese patent application CN 02111075.1 firstly discloses that the alopecurone has the dual effects of whitening and resisting bacteria. The preparation method comprises the steps of alcohol extraction, filtration, acid-base treatment, decolorization, and finally column chromatography separation and purification.

Chinese patent application CN 101106971B discloses the use of crude extract of sophora alopecuroides rhizome in personal care products for whitening and lightening skin. The crude extract is prepared by extracting with ethanol, filtering, treating with acid and alkali, decolorizing, and separating and purifying by column chromatography.

The three patent applications all adopt a column chromatography method, so that the method is not suitable for large-scale production, and is complex in operation and difficult in quality control.

Sophora alopecuroides L is a plant of Sophora genus of Leguminosae family, and is mainly distributed in northern desert and semi-desert areas of China. The seeds are traditional Chinese medicine, and the seeds of the sophora alopecuroides are used as antipyretics, analgesics and antibacterial agents in traditional Chinese medicine. The invention discloses a method for industrially preparing high-purity alopecurone by taking a sophora alopecuroides rhizome as a raw material, which comprises the following steps: the method avoids acid-base treatment and chromatographic separation, thereby avoiding the degradation and isomerization of the alopecurone in the acid-base treatment process and improving the purity and yield of the compound. Thus reducing possible toxicity and skin irritation. The alopecurone obtained by the method has better skin-lightening activity than the known skin-lightening agent.

disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. The invention discloses a method for industrially preparing high-purity alopecurone by taking a sophora alopecuroides rhizome as a raw material, which comprises the following steps: the method avoids acid-base treatment and chromatographic separation, thereby avoiding the degradation and isomerization of the alopecurone in the acid-base treatment process and improving the purity and yield of the compound. Thus reducing possible toxicity and skin irritation. The alopecurone obtained by the method has better skin-lightening activity than the known skin-lightening agent.

The present invention improves the deficiencies of the prior art by providing a simple and convenient method for preparing high purity alopecurone and a novel composition for skin lightening comprising:

personal care products and cosmetically acceptable carriers and high purity alopecurone.

The skin lightening compositions of the present invention comprise from 0.001% to 5% of alopecurone, and in a preferred embodiment of the invention, the compositions of the present invention may be combined with:

Alpha-hydroxy acids, beta-hydroxy acids, polyhydroxy acids, hydroquinone, tert-butylhydroquinone; vitamin B and/or C derivatives; a retinoid; resorcinol derivatives, in particular 4-substituted resorcinol derivatives; vanillic acid, betulinic acid, hyaluronic acid, hydrolyzed milk protein, and mixtures thereof.

organic or inorganic sunscreens may also be included in the compositions of the present invention.

Organic sunscreens may include p-aminobenzoic acid (PABA), benzophenone, methoxycinnamate, ethyldihydroxypropyl-PABA, glyceryl-PABA, trimethylcyclohexyl salicylate, methyl anthranilate, 2-ethylhexyl 2-cyano-3, 3-diphenylacrylate, octyldimethyl PABA, octyl methoxycinnamate (PARSOLTM MCX), octyl salicylate, 2-phenylbenzimidazole-5-sulfonic acid, Triethanolamine (TEA) salicylic acid, 3- (4-methylbenzylidene camphor) ketone, benzophenone-1, benzophenone-6, benzophenone-12, 4-isopropyldibenzoylmethane, butylmethoxydibenzoylmethane (PARSOLTM 1789), ethyl 2-cyano-3, 3-diphenylacrylate, and mixtures thereof.

The present invention is based, at least in part, on the discovery that alopecurone has skin lightening activity (CN 02111075.1). The inhibition activity of the alopecurone prepared by the invention on the tyrosinase is more than IC 503 mug/ml.

Alopecurone has been identified as an active ingredient in the rhizome of sophora alopecuroides. Which comprises the two epimers alopecurone A and B

Chemical structure of alopecurone

according to the invention, the alopecurone is present in the composition in a range of 0.001 to 5% by weight. The term "composition" as used herein refers to a composition for topical application to human skin. The term "skin" as used herein includes the skin of the face, neck, chest, back, arms, armpits, hands, legs, and scalp.

The alopecuroids of the invention are obtained from the rhizomes (Sophora alopecuroids L) of the Sophora genus and the alopecuroids L. The original production place of the sophora alopecuroide used in the embodiment of the invention is Ningxia Hui nationality autonomous region.

The preparation scheme is as follows:

Extraction solvents suitable for the present invention are organic solvents such as alcohols (methanol, ethanol, isopropanol) and acetone.

50% -100% ethanol is the preferred organic solvent.

The rhizome of Sophora alopecuroides is first crushed into 0.1-5 mm pieces or powder and soaked in 95% alcohol at room temperature for 2-3 days. The extraction process was repeated 1 or 2 times. The extracts were combined and concentrated to remove the solvent. An oil was obtained. The oil and three times the weight of 200- & 300 mesh silica gel mixed into solid. The solid was placed on a soxhlet extractor and extracted with an organic solvent. The organic solvent mentioned herein is an aprotic organic solvent such as petroleum ether, n-hexane, diethyl ether, isopropyl ether, ethyl acetate, butyl acetate, acetone, methyl chloride, ethyl chloride, methylene chloride, ethylene dichloride, acetonitrile, propionitrile, tetrahydrofuran, sulfolane and the like. Or a mixed solvent formed by the aprotic organic solvent in a certain proportion. For example, petroleum ether-acetone (100: 1-1: 100), petroleum ether-ethyl acetate (100: 1-1: 100), n-hexane: chloroform (30: 1-1:30)

Preferred solvents are ethyl acetate, butyl acetate, dichloromethane, trichloromethane. The extraction process was maintained until the droplets from the extraction reflux were colorless. The extract is discarded and the extraction solvent is changed to a protic solvent, such as methanol, ethanol, isopropanol, butanol, etc., with a preferred solvent being 60% to 100% ethanol. The extraction process was maintained until the refluxed drops were colorless. Concentrating to remove solvent to obtain light yellow powder which is alopecurone, washing with chloroform for three times, filtering, and recrystallizing with isopropanol to obtain pure alopecurone. Purity > 92%. its chemical structure was determined by comparison with standards and finally by mass spectrometry and nuclear magnetic resonance spectroscopy.

The alopecurone prepared by the method can be used in personal care or cosmetic compositions. It can be used in combination with other active compounds including anti-aging agents, wrinkle reducing agents, skin whitening agents, anti-acne agents and sebum reducing agents. These active compounds

Including alpha-hydroxy acids, beta-hydroxy acids, polyhydroxy acids, hydroquinone, t-butylhydroquinone; vitamin B and/or C derivatives; a retinoid; betulinic acid; vanillic acid; allantoin, placenta extract; hydrolyzed milk proteins and resorcinol derivatives.

the personal care or cosmetic compositions described above include a daily chemical acceptable carrier which may be a diluent, dispersant or carrier for the active ingredient in the composition to facilitate its distribution when the composition is applied to the skin.

The carrier may be aqueous, anhydrous or an emulsion. The composition is preferably an aqueous solution or emulsion, especially a water-in-oil or oil-in-water emulsion, preferably an oil-in-water emulsion. When present, water is preferably present in an amount of 40-70% by weight.

In addition to water, volatile solvents may also be used as carriers in the compositions of the present invention. Most preferred are monohydroxy C1-C3 alkanols. Including ethanol, methanol, and isopropanol. The alcohol is most preferably present in 15-40% by weight.

Emollient materials may also serve as acceptable carriers. These emollients are silicone oils and synthetic esters. The preferred amount of emollient is 1-20%. Wherein the synthetic ester emollient comprises:

(1) An alkenyl or alkyl ester of a fatty acid having 10 to 20 carbon atoms. Which comprises isoarachidylester pivalate and isoarachidylester pivalate

Isononyl pelargonate, oleyl myristate, oleyl stearate and oleyl oleate;

(2) Ether-esters, such as fatty acid esters of ethoxylated fatty alcohols;

(3) A polyol ester. Which includes ethylene glycol mono and di-fatty acid esters, diethylene glycol mono and di-fatty acid esters, polyethylene glycol (200-;

(4) Wax esters such as beeswax, spermaceti, myristyl myristate, stearyl stearate and arachidyl behenate;

Fatty acids having from 10 to 30 carbon atoms may also be used as cosmetically acceptable carriers for the compositions of this invention. These fatty acids are pelargonic, lauric, myristic, palmitic, stearic, isostearic, hydroxystearic, oleic, linoleic, ricinoleic, arachidic, behenic and erucic acids.

Humectants of the polyol type may also be employed as cosmetically acceptable carriers in the compositions of this invention. Humectants help to increase the effectiveness of emollients, reduce scaling, stimulate cumulative scale removal and improve skin feel. Typical polyols include glycerol, polyalkylene glycols and more preferably alkyl polyols and derivatives thereof, such as propylene glycol, dipropylene glycol, polypropylene glycol, polyethylene glycol and derivatives thereof, sorbitol, hydroxypropyl sorbitol, hexylene glycol, 1, 3-butylene glycol, 1, 2, 6-hexanetriol, ethoxylated glycerol, propoxylated glycerol and mixtures thereof. For optimum effect, the humectant is preferably propylene glycol or sodium hyaluronate. The humectant may be present in an amount of 1-15% by weight of the composition.

Thickeners may also be included as part of the carrier of the compositions of the present invention. Typical thickeners include cross-linked acrylates (e.g. Carbopol (TM) 982), hydrophobically modified acrylates (e.g. Carbopol (TM) 1382), taurine polymers, cellulose derivatives and natural gums. These thickeners are usually present in amounts of from 0.01 to 0.5%.

Surfactants may also be present in the compositions of the present invention. The total concentration of the surfactant is 1-5% of the composition.

the surfactant may be selected from anionic, nonionic, cationic and amphoteric surfactants.

Optionally, a plasticizer can be added into the composition; calamine; an antioxidant; chelating agents and sunscreens.

other auxiliary minor ingredients may also be added to the composition. These components include colorants, pigments, opacifiers and fragrances. The amount of these auxiliary minor components may range from 0.001% up to 20% of the composition.

The invention has the advantages that:

the invention discloses a method for industrially preparing high-purity alopecurone by taking a sophora alopecuroides rhizome as a raw material, which comprises the following steps: the method avoids acid-base treatment and chromatographic separation, thereby avoiding the degradation and isomerization of the alopecurone in the acid-base treatment process and improving the purity and yield of the compound. Thus reducing possible toxicity and skin irritation. The alopecurone obtained by the method has better skin-lightening activity than the known skin-lightening agent.

Examples