Emulsion containing eucommia leaf extract and preparation method

Abstract

The application belongs to the technical field of cosmetics, and particularly relates to an emulsion containing eucommia leaf extract and a preparation method. The emulsion containing eucommia leaf extract comprises the following components in mass fraction: 70-80 parts of water, 1.3-1.7 parts of eucommia leaf extract, 0.2-0.5 parts of radix breyniae extract, 0.8-1.1 parts of nicotinamide, 0.5-1.0 parts of tocopheryl acetate, 0.1-0.4 parts of vitamin C ethyl ether, 0.02-0.05 parts of skin conditioner, 5-10 parts of humectant, 4-7 parts of emollient and 2-4 parts of emulsifier. The eucommia leaf extract has a high content of chlorogenic acid, and the emulsion prepared from the eucommia leaf extract has good antioxidant effect and high stability.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of cosmetics, and particularly relates to an emulsion containing Eucommia ulmoides Oliv. leaf extract and a preparation method. BACKGROUND

[0002] With the increasing demand of consumers for natural, safe and efficacious skin care products, the application of plant extracts in the field of cosmetics has attracted widespread attention. As a traditional medicinal plant, Eucommia ulmoides Oliv. is rich in various bioactive components in its leaves, which have significant biological effects such as antioxidant, anti-inflammatory, antibacterial and moisturizing effects. In recent years, it has gradually become a research hotspot of natural plant cosmetic raw materials.

[0003] The main active ingredient in Eucommia ulmoides Oliv. leaf extract, chlorogenic acid, is a powerful natural phenolic antioxidant that can effectively scavenge free radicals, inhibit ultraviolet-induced oxidative stress and reduce the damage of photoaging to the skin. At the same time, studies have shown that chlorogenic acid also has the effect of inhibiting tyrosinase activity, which helps to reduce melanin production, improve dull skin and has certain whitening potential. In addition, flavonoids in Eucommia ulmoides Oliv. leaves also exhibit good anti-inflammatory and soothing effects, making them suitable for sensitive skin care products. Based on the above multiple effects, Eucommia ulmoides Oliv. leaf extract has been tried to be applied to various skin care products such as masks, serums, emulsions and creams as a natural functional additive.

[0004] However, in practical application, Eucommia ulmoides Oliv. leaf extract still faces many technical bottlenecks and challenges in the field of cosmetics. First, the existing extraction processes (such as ethanol reflux extraction, ultrasonic-assisted extraction and enzyme-assisted extraction) result in low chlorogenic acid content in the extract. Second, Eucommia ulmoides Oliv. leaf extract is mostly water or alcohol extracted crude extract, which contains many macromolecular impurities or polysaccharide substances. Direct addition to the emulsion system can easily cause turbidity, delamination or unstable viscosity, affecting the sensory experience and physical stability of the product.

[0005] Therefore, it is urgent to develop a new preparation method that can efficiently enrich the active ingredients in Eucommia ulmoides Oliv. leaves and stably integrate them into the emulsion system. SUMMARY

[0006] The purpose of the present application is to provide an emulsion containing Eucommia ulmoides Oliv. leaf extract and a preparation method.

[0007] In order to achieve the above purpose, the present application provides the following technical solutions:

[0008] An emulsion containing eucommia leaf extract, comprising the following components in mass fraction: water 70-80 parts, eucommia leaf extract 1.3-1.7 parts, radix scrophulariae extract 0.2-0.5 parts, nicotinamide 0.8-1.1 parts, tocopheryl acetate 0.5-1.0 parts, vitamin C ethyl ether 0.1-0.4 parts, skin conditioner 0.02-0.05 parts, humectant 5-10 parts, emollient 4-7 parts, emulsifier 2-4 parts.

[0009] Preferably, the preparation method of the eucommia leaf extract comprises the following steps:

[0010] (1) crushing eucommia leaves, mixing the powder and water, heating and extracting to obtain a mixed liquid;

[0011] (2) sterilizing the mixed liquid, adding bacterial strains, performing anaerobic fermentation, sterilizing after fermentation is completed, centrifuging, and collecting the centrifugal liquid;

[0012] (3) filtering the centrifugal liquid, reducing pressure concentration of the filtrate, and spray drying to obtain the eucommia leaf extract.

[0013] The eucommia leaf extract, radix scrophulariae extract and nicotinamide are innovatively and scientifically compounded to form a multi-channel synergistic whitening and antioxidant system, and the compound system can not only significantly brighten skin color and improve dullness, but also reduce the oxidative damage of the external environment to the skin and delay aging.

[0014] Preferably, the bacterial strains include animal bifidobacterium lactis, long bifidobacterium longum and bifidobacterium adolescentis, and the live bacterial quantity ratio of the animal bifidobacterium lactis, long bifidobacterium longum and bifidobacterium adolescentis in the bacterial strains is (0.3-0.5):(1.4-1.6):1.

[0015] The eucommia leaf extract is prepared by using a fermentation extraction process, and by using specific bacterial agents and controlling fermentation conditions, the active ingredient chlorogenic acid in the eucommia leaf extract is significantly enriched, which is much higher than that obtained by a traditional extraction method. The high content of chlorogenic acid not only enhances the antioxidant capacity of the extract itself, but also effectively removes free radicals, inhibits ultraviolet-induced oxidative stress, and reduces skin photoaging damage.

[0016] Preferably, the anaerobic fermentation condition is that the fermentation temperature is 35-40 DEG C, and the fermentation time is 35-40 h.

[0017] Preferably, the humectant is at least one selected from glycerol, hyaluronic acid and butanediol.

[0018] Preferably, the skin conditioner is at least one selected from panthenol and allantoin.

[0019] Preferably, the emollient is at least one selected from caprylic acid / capric acid triglyceride, squalane and isononyl isononanoate.

[0020] Preferably, the emulsifier is selected from the group consisting of ceteth-20, steareth-2, MONTANOV TM 202.

[0021] Preferably, the emulsifier comprises ceteth-20, steareth-2 and MONTANOV TM 202 in a mass ratio of 1:(0.5-0.8):(1.2-1.4).

[0022] The preparation method of the emulsion containing eucommia leaf extract comprises the following steps:

[0023] (1) sequentially adding a humectant, niacinamide and a skin conditioner into water, heating and stirring until completely dissolved to obtain phase A.

[0024] (2) adding an emollient, tocopheryl acetate and an emulsifier, heating and stirring until completely melted, clarified and transparent to obtain phase B;

[0025] (3) under stirring, pouring phase B into phase A, homogenizing to form an emulsion;

[0026] (4) cooling the emulsion, sequentially adding vitamin C ethyl ether, radix breviculatae extract and eucommia leaf extract, stirring and cooling to room temperature to obtain an emulsion containing eucommia leaf extract.

[0027] Compared with the prior art, the emulsion containing eucommia leaf extract has the following advantages and beneficial effects:

[0028] 1. The eucommia leaf extract is prepared by a fermentation extraction process in the present application, and the active ingredient chlorogenic acid is significantly enriched in the eucommia leaf extract by using specific bacterial agents and controlling fermentation conditions, which is much higher than that obtained by traditional extraction methods. The high content of chlorogenic acid not only enhances the antioxidant capacity of the extract itself, but also effectively eliminates free radicals and inhibits ultraviolet-induced oxidative stress, thereby reducing skin photoaging damage.

[0029] 2. The eucommia leaf extract, radix breviculatae extract and niacinamide are innovatively and scientifically compounded in the present application to form a multi-channel synergistic whitening and antioxidant system. The compound system not only can significantly brighten skin color and improve dullness, but also can reduce the oxidative damage of the skin caused by the external environment and delay aging.

[0030] 3. The emulsifier in the present application forms a composite emulsification system to form a dense and stable interfacial film, which significantly improves the physical stability of the emulsion and effectively prevents the emulsion from separating during long-term storage. At the same time, it helps to ensure that functional ingredients such as niacinamide and plant extracts are uniformly dispersed and stably present, prolongs the shelf life of the product, and meets the needs of industrial production and long-term use of consumers. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present application will be clearly and completely described below. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0032] The raw materials used in the following embodiments of the present application are all commercially available:

[0033] The number of animal bifidobacterium lactis is BL-G101; the number of long bifidobacterium longum is BL-G301; the number of Bifidobacterium adolescentis is BQ-G50; the number of Lactobacillus gasseri is LG-G12; the number of Bifidobacterium breve is BB-G95, all from Junyao Runying Biotechnology (Shanghai) Co., Ltd. MONTANOV TM 202, INCI name: arachidyl alcohol, behenyl alcohol, arachidyl glucoside. Brand: Sederma, France. Extract of Buddleja officinalis, Mufei Biological Technology Co., Ltd. of Shaanxi. Extract of Glycyrrhiza glabra roots, Wuhan Sure Biological Technology Co., Ltd. Ceteth-20, CAS: 68439-49-6. Steareth-2, CAS: 9005-00-9. Cetylstearyl alcohol, CAS: 67762-27-0. Tocopheryl acetate, CAS: 7695-91-2. Vitamin C ethyl ether, CAS: 86404-04-8.

[0034] Example 1

[0035] The present embodiment provides an emulsion containing eucommia leaf extract, which comprises the following components in mass fraction: water 76 parts, eucommia leaf extract 1.6 parts, Buddleja officinalis extract 0.4 parts, nicotinamide 1.0 part, tocopheryl acetate 0.7 part, vitamin C ethyl ether 0.2 part, skin conditioner (panthenol) 0.04 part, humectant (glycerin) 8 parts, emollient (caprylic / capric triglyceride) 5 parts, emulsifier 3 parts. The emulsifier is a mixture of ceteth-20, steareth-2 and MONTANOV TM 202.

[0036] The preparation method of the eucommia leaf extract comprises the following steps:

[0037] (1) Accurately weigh the dried eucommia leaf (water content 8wt%), crush to less than 200 mesh, and put the powder into an extraction bottle. Pour 10 times the mass of water into the powder, heat at 60℃ for 1h to obtain a mixed liquid;

[0038] (2) sterilize the mixed liquid, add the bacterial strain, which includes Bifidobacterium animalis lactis, Bifidobacterium longum longum and Bifidobacterium adolescentis, and the ratio of the live bacterial quantity of Bifidobacterium animalis lactis, Bifidobacterium longum longum and Bifidobacterium adolescentis in the bacterial strain is 0.4:1.5:1, and the dosage of the bacterial strain in the mixed liquid is 10 6 CFU / mL mixed liquid; perform anaerobic fermentation, the fermentation temperature is 37℃, the fermentation time is 38h, sterilize after the fermentation is completed, centrifuge, and collect the centrifugal liquid;

[0039] (3) filter the centrifugal liquid using a 0.22μm filter membrane, reduce-pressure concentrate the filtrate, and spray-dry to obtain the Eucommia ulmoides leaf extract.

[0040] The preparation method of the emulsion containing the Eucommia ulmoides leaf extract includes the following steps:

[0041] (1) add water into a main reaction kettle, sequentially add the moisturizing agent, nicotinamide and skin conditioner, heat to 40℃, and stir at 80rpm for 15 minutes until completely dissolved to obtain phase A.

[0042] (2) mix the emollient, tocopheryl acetate and emulsifier, heat to 75℃, stir at 100rpm for 15 minutes until completely melted, clear and transparent, and keep warm for 20 minutes to obtain phase B;

[0043] (3) under the stirring state, pour phase B into phase A, use a homogenizer to perform primary homogenization at a speed of 4000rpm for 5 minutes, cool to 60℃, use a high-shear emulsifier at a speed of 8000rpm for 8 minutes of homogenization to form an emulsion.

[0044] (4) cool the emulsion to 40℃, sequentially add vitamin C ethyl ether, radix brevifoliae extract and Eucommia ulmoides leaf extract, stir at 100rpm for 20 minutes at low speed until evenly dispersed, and cool to room temperature to obtain the emulsion containing the Eucommia ulmoides leaf extract.

[0045] Example 2

[0046] The present embodiment provides an emulsion containing Eucommia ulmoides leaf extract, which includes the following components in mass fraction: water 80 parts, Eucommia ulmoides leaf extract 1.7 parts, radix brevifoliae extract 0.2 parts, nicotinamide 1.1 parts, tocopheryl acetate 0.5 parts, vitamin C ethyl ether 0.4 parts, skin conditioner (panthenol) 0.02 parts, moisturizing agent (glycerol) 10 parts, emollient (caprylic / capric triglyceride) 4 parts, and emulsifier 4 parts. The emulsifier is ceteth-20, steareth-2 and MONTANOV TM 202.

[0047] The preparation method of the Eucommia ulmoides leaf extract includes the following steps:

[0048] (1) Accurately take the dried Eucommia ulmoides leaves (water content 8wt%), crush to less than 200 mesh, and place the powder in an extraction bottle. Pour water with a mass of 10 times the mass of the powder into the bottle, heat at 60℃, and extract for 1h to obtain a mixed liquid;

[0049] (2) Sterilize the mixed liquid and add the bacterial strain, which includes Bifidobacterium animalis lactis, Bifidobacterium longum longum, and Bifidobacterium adolescentis. The ratio of the live bacterial quantity of Bifidobacterium animalis lactis, Bifidobacterium longum longum, and Bifidobacterium adolescentis in the bacterial strain is 0.5:1.6:1. The amount of the bacterial strain used in the mixed liquid is 10 6 CFU / mL of the mixed liquid. Perform anaerobic fermentation at a fermentation temperature of 37℃ for 40h. After the fermentation is completed, sterilize, centrifuge, and collect the centrifugal liquid.

[0050] (3) Filter the centrifugal liquid using a 0.22μm filter membrane, reduce the pressure to concentrate the filtrate, and spray dry to obtain the Eucommia ulmoides leaf extract.

[0051] The preparation method of the emulsion containing the Eucommia ulmoides leaf extract includes the following steps:

[0052] (1) Add water to a main reaction kettle, and sequentially add a humectant, nicotinamide, and a skin conditioner. Heat to 40℃, and stir at 80rpm for 15min until completely dissolved to obtain phase A.

[0053] (2) Mix an emollient, tocopheryl acetate, and an emulsifier, heat to 75℃, and stir at 100rpm for 15min until completely melted, clear, and transparent. Keep warm for 20min to obtain phase B.

[0054] (3) Under stirring, pour phase B into phase A, use a homogenizer for primary homogenization at a speed of 4000rpm for 5min, cool to 60℃, use a high-shear emulsifier at a speed of 8000rpm for 8min, and form an emulsion.

[0055] (4) Cool the emulsion to 40℃, and sequentially add vitamin C ethyl ether, a radix isatidis extract, and a Eucommia ulmoides leaf extract. Stir at 100rpm for 20min at low speed until evenly dispersed, and cool to room temperature to obtain the emulsion containing the Eucommia ulmoides leaf extract.

[0056] Comparative Example 1

[0057] The difference between this comparative example and Example 1 is that the Eucommia ulmoides leaf extract is prepared by a traditional method.

[0058] The preparation method of the Eucommia ulmoides leaf extract comprises the following steps: accurately taking the dried Eucommia ulmoides leaves (containing 8 wt% of water), crushing to less than 200 meshes, placing the powder in an extraction bottle, pouring 13 times the mass of the powder with water, extracting at a temperature of 68 ℃, 2 times of extraction, 1 h for each time of extraction, centrifuging, and collecting the centrifugal liquid; filtering the centrifugal liquid by using a 0.22 μm filter membrane, reducing pressure concentration of the filtrate, and spray drying to obtain the Eucommia ulmoides leaf extract.

[0059] Comparative Example 2

[0060] The difference between the present comparative example and Example 1 is that the types of the strains are different.

[0061] The strains include Lactobacillus gasseri, Bifidobacterium breve and Bifidobacterium adolescentis; the live bacteria quantity ratio of Lactobacillus gasseri, Bifidobacterium breve and Bifidobacterium adolescentis in the strains is 0.4:1.5:1.

[0062] Comparative Example 3

[0063] The difference between the present comparative example and Example 1 is that the live bacteria quantity ratio of Bifidobacterium animalis lactis, Bifidobacterium longum longum and Bifidobacterium adolescentis in the strains is 1:1:1.

[0064] Comparative Example 4

[0065] The difference between the present comparative example and Example 1 is that the live bacteria quantity ratio of Bifidobacterium animalis lactis, Bifidobacterium longum longum and Bifidobacterium adolescentis in the strains is 1:0.4:1.5.

[0066] Comparative Example 5

[0067] The difference between the present comparative example and Example 1 is that the fermentation temperature is 37 ℃ and the fermentation time is 50 h.

[0068] Comparative Example 6

[0069] The difference between the present comparative example and Example 1 is that 0.2 parts of the Radix Oxytropidis extract and 1.1 parts of nicotinamide are replaced by 0.2 parts of the Glycyrrhiza glabra root extract and 1.1 parts of resveratrol.

[0070] Comparative Example 7

[0071] The difference between the present comparative example and Example 1 is that 1.6 parts of the Eucommia ulmoides leaf extract, 0.4 parts of the Radix Oxytropidis extract and 1.0 parts of nicotinamide are replaced by 1.0 parts of the Eucommia ulmoides leaf extract, 1.0 parts of the Radix Oxytropidis extract and 1.0 parts of nicotinamide.

[0072] Comparative Example 8

[0073] The difference between the present comparative example and Example 1 is that the emulsifier is ceteareth-20 and steareth-2 with a mass ratio of 1:0.6.

[0074] Comparative Example 9

[0075] The difference between the present comparative example and Example 1 is that the emulsifier is cetyl stearyl alcohol polyether-20, stearyl polyether-2 and glyceryl stearate in a mass ratio of 1:0.6:1.3.

[0076] Comparative Example 10

[0077] The difference between the present comparative example and Example 1 is that the emulsifier is cetyl stearyl alcohol polyether-20, stearyl polyether-2 and MONTANOV TM 202.

[0078] Performance test

[0079] 1. The content of chlorogenic acid in the eucommia leaf extract prepared in Examples 1-2 and Comparative Examples 1-5 was determined, and the determination method referred to "Optimization of Extraction Process of Chlorogenic Acid from Eucommia Leaf and Stability" (Li Jia et al.).

[0080] The results are shown in Table 1.

[0081] Table 1 Content of chlorogenic acid in eucommia leaf extract

[0082]

[0083] It can be known from the results that the content of chlorogenic acid in the eucommia leaf extract prepared in Examples 1-2 of the present application is greater than that in Comparative Example 1 of the prior art.

[0084] It can be known from Comparative Example 2 that the type of strain has an important influence on the content of chlorogenic acid in the eucommia leaf extract.

[0085] It can be known from Comparative Examples 3-5 that the ratio of strains and the fermentation time can affect the content of chlorogenic acid. Analysis is that the traditional hot water extraction method can only extract the free and easily dissolved chlorogenic acid in eucommia leaf. The present application method releases the chlorogenic acid precursor material combined with cellulose, protein and other macromolecules in eucommia leaf through fermentation of specific strains, and converts it into free chlorogenic acid. Since different strains produce different types and efficiencies of enzymes, the composition and activity of the entire enzyme system can be optimized through accurate ratio. At the same time, the strains selected in the present application can reduce the degradation of chlorogenic acid during fermentation; too long fermentation time in the system may cause other side reactions of the released chlorogenic acid.

[0086] 2. DPPH radical scavenging rate determination: 5 mg of DPPH was weighed and dissolved in 100 mL of anhydrous ethanol, and ultrasonically treated for 5 minutes to fully dissolve it. After mixing, a DPPH stock solution was prepared. 5 mL of the stock solution was taken, and its absorbance (A value) was determined at a wavelength of 519 nm. This was used as the DPPH standard solution for subsequent experiments. 5 mL of the emulsion was mixed with 5 mL of the DPPH standard solution, and thoroughly shaken to make it uniform. It was reacted at room temperature for 30 minutes in the dark. After the reaction was complete, 7.5 mL of the mixed solution was taken, diluted with 10 mL of anhydrous ethanol, and mixed well. Then, its absorbance value was determined at a wavelength of 519 nm. Each group of samples was determined in triplicate, and the average of the three measurement results was taken as the final determination value.

[0087] DPPH radical scavenging rate (%) = 1 - (A2 / A1) x 100%;

[0088] A1: The absorbance value of the mixed solution composed of DPPH solution and anhydrous ethanol;

[0089] A2: The absorbance value of the mixed solution composed of DPPH solution, ethanol solution, and sample solution.

[0090] The results are shown in Table 2.

[0091] Table 2 DPPH radical scavenging rate

[0092] DPPH radical scavenging % Example 1 Example 1 95.2 Example 2 94.6 Comparative Example 1 83.1 Comparative Example 2 85.2 Comparative Example 3 86.0 Comparative Example 4 87.7 Comparative Example 5 88.5 Comparative Example 6 79.1 Comparative Example 7 81.7

[0093] As can be seen from Table 2, eucommia leaf extract, radix brevicadinae extract, and nicotinamide can play a synergistic effect when compounded at a certain ratio, and can improve the DPPH radical scavenging rate.

[0094] 3. The emulsion was sealed and placed at 25°C for 12 months, and whether it was layered was observed.

[0095] Table 3 Stability test results

[0096] Example 1 No delamination Example 2 No delamination Comparative Example 1 No delamination Comparative Example 2 No delamination Comparative Example 3 No delamination Comparative Example 4 No delamination Comparative Example 5 No delamination Comparative Example 6 Delamination occurred Comparative Example 7 No delamination Comparative Example 8 Delamination occurred Comparative Example 9 Delamination occurred Comparative Example 10 Delamination occurred

[0097] As can be seen from Table 3, the addition of glycyrrhiza glabra root extract and resveratrol to the emulsion caused the stability of the emulsion to deteriorate. It was analyzed that the physical and chemical properties of the system, such as the composition and electrolyte strength, were changed, resulting in a decrease in the stability of the emulsion. The composition and ratio of the emulsifier of the present application also have an important influence on the stability of the emulsion.

[0098] The above is a preferred embodiment of the present application. It should be noted that for those skilled in the art, without departing from the principles of the present application, a number of improvements and refinements can be made, which should also be considered within the scope of protection of the present application.

Claims

1. An emulsion containing Eucommia ulmoides leaf extract, characterized in that, The product comprises the following components in parts by weight: 70-80 parts water, 1.3-1.7 parts Eucommia ulmoides leaf extract, 0.2-0.5 parts Oroxylum indicum extract, 0.8-1.1 parts nicotinamide, 0.5-1.0 parts tocopheryl acetate, 0.1-0.4 parts vitamin C ethyl ether, 0.02-0.05 parts skin conditioning agent, 5-10 parts moisturizer, 4-7 parts emollient, and 2-4 parts emulsifier. The preparation method of Eucommia ulmoides leaf extract includes the following steps: (1) After crushing the Eucommia ulmoides leaves, mix them with water and heat to extract the mixture; (2) Add the inoculum to the mixture and carry out anaerobic fermentation. After fermentation, sterilize, centrifuge, and collect the centrifuged liquid. (3) Filter the centrifuged liquid, concentrate the filtrate under reduced pressure, and spray dry to obtain Eucommia ulmoides leaf extract; The bacterial strains include Bifidobacterium animalis subsp. lactis, Bifidobacterium longum subsp. longis, and Bifidobacterium adolescentis with a live bacterial count ratio of (0.3-0.5):(1.4-1.6):

1. The fermentation temperature is 35-40℃, and the fermentation time is 35-40h.

2. The emulsion containing Eucommia ulmoides leaf extract according to claim 1, characterized in that, The moisturizer is selected from at least one of glycerin, hyaluronic acid, and butylene glycol.

3. The emulsion containing Eucommia ulmoides leaf extract according to claim 1, characterized in that, The skin conditioning agent is selected from at least one of panthenol and allantoin.

4. The emulsion containing Eucommia ulmoides leaf extract according to claim 1, characterized in that, The emollient is selected from at least one of caprylic / capric triglyceride, squalane, and isononyl isononanoate.

5. The emulsion containing Eucommia ulmoides leaf extract according to claim 1, characterized in that, The emulsifiers are selected from cetearyl alcohol polyether-20, stearoyl polyether-2, and MONTANOV. TM At least one of 202.

6. The emulsion containing Eucommia ulmoides leaf extract according to claim 5, characterized in that, The emulsifier comprises cetearyl alcohol polyether-20, stearoyl polyether-2, and MONTANOV in a mass ratio of 1:(0.5-0.8):(1.2-1.4). TM 202.

7. A method for preparing an emulsion containing Eucommia ulmoides leaf extract according to any one of claims 1-6, characterized in that, Includes the following steps: (1) Add moisturizer, niacinamide and skin conditioning agent to water in sequence, heat and stir until completely dissolved to obtain phase A; (2) Heat and stir the emollient, tocopheryl acetate and emulsifier until completely melted and clear to obtain phase B; (3) While stirring, pour phase B into phase A, homogenize, and form an emulsion; (4) Cool the emulsion, add vitamin C ethyl ether, wood butterfly extract and eucommia leaf extract in sequence, stir, and cool to room temperature to obtain an emulsion containing eucommia leaf extract.

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