Skin brightening composition containing camellia nitidissima extract and application of skin brightening composition in preparation of cosmetics suitable for dry sensitive skin

Abstract

The invention relates to a composition containing camellia nitidissima extract and capable of brightening skin color and application of the composition to preparation of cosmetics suitable for dry sensitive skin, and the composition comprises the following components: camellia nitidissima flower extract, elm bark extract, oat kernel protein and laver polysaccharide in front of water temple, the weight ratio of the camellia nitidissima flower extract to the elm barks extract to the oat kernel protein to the laver polysaccharide in front of water temple is (1-10): (1-8): (0.1-1): (0.01-0.1). The composition can achieve the optimal long-acting brightening, barrier repairing and stimulation relieving effects on the aspect of efficacy.

Description

Technical Field

[0001] The present invention relates to the technical field of cosmetics, and particularly relates to a skin brightening composition containing camellia nitidissima extract and its application in the preparation of cosmetics suitable for dry and sensitive skin. Background Art

[0002] Dry and sensitive skin (also known as dry-sensitive skin) refers to skin that has both dryness and water shortage problems, and is highly sensitive, easily affected by external stimuli (such as climate change, chemical components, etc.), and shows discomfort symptoms such as redness, inflammation, and chapping. This type of skin usually has a duller complexion, and is prone to uneven skin tone or post-inflammatory hyperpigmentation. Therefore, for the brightening research of dry and sensitive skin, special attention needs to be paid to how to improve uneven skin tone, brighten the skin tone and repair the skin barrier on the premise of avoiding irritation.

[0003] Currently, common skin brightening ingredients are niacinamide and tranexamic acid, etc. However, they may cause irritation reactions to some sensitive skin, especially at higher concentrations, and discomfort such as stinging and redness may occur; it takes a long time to use to see the effect, and some products may require relatively complex usage methods. And ingredients such as hyaluronic acid and ceramide mainly focus on moisturizing, and the brightening effect is relatively mild. They need to be used in combination with other skin brightening ingredients to achieve obvious effects. For dry-sensitive skin, laser or light therapy may cause strong irritation, and may even damage the skin barrier. It needs to be carried out under the guidance of a professional doctor, the treatment cost is high, and usually multiple treatments are required. Therefore, the brightening scheme for dry-sensitive skin should be mainly mild and reparative, combined with suitable skin brightening ingredients, avoid irritation, and pay attention to the skin's feedback and tolerance during use. Summary of the Invention

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a skin brightening composition containing camellia nitidissima extract and its application in the preparation of cosmetics suitable for dry and sensitive skin.

[0005] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0006] In the first aspect, the present invention provides a skin brightening composition containing camellia nitidissima extract, comprising the following components: camellia nitidissima flower extract, smooth fruit elm bark extract, oat kernel protein, and agar-agar polysaccharide. The weight ratio of the camellia nitidissima flower extract, smooth fruit elm bark extract, oat kernel protein, and agar-agar polysaccharide is (1 - 10):(1 - 8):(0.1 - 1):(0.01 - 0.1).

[0007] The chemical components in the flower extract of Camellia chrysantha mainly include flavonoids, tea polyphenols, tea polysaccharides, saponins, trace elements, amino acids, fiber fats, etc., which can play multiple roles such as antioxidant, anti-inflammatory, and enhancing skin barrier function. For example, tea polyphenols and flavonoids in Camellia chrysantha have strong antioxidant effects. They can prevent free radical damage to the skin by slowing down oxidative stress, reduce skin aging and allergic reactions caused by inflammation. In particular, polyphenols have been proven to inhibit the PAR2 receptor, and flavonoids are one of the sources of TRPV1 inhibitors; Amino acids are the basic components of the skin structure, which can promote the synthesis of the stratum corneum and repair damaged skin barriers; Trace elements play an important role in skin repair and antioxidant. They participate in the metabolism of skin cells, promote the synthesis of collagen, help maintain the elasticity and structure of the skin, and enhance the repair ability of the skin barrier.

[0008] The bark extract of Anogeissus Leiocarpa is rich in polysaccharides. The roles of these natural macromolecules in plants usually include storing energy, supporting plant structures, and protecting against adverse environments (such as drought, cold, etc.). When applied to the skin, polysaccharides can enhance the skin's barrier function, prevent water loss, and isolate external harmful substances. They can also promote the regeneration and repair of skin cells, helping to repair damaged skin barriers. Moreover, the bark extract of Anogeissus Leiocarpa is rich in flavonoids, which are a class of powerful natural antioxidants with the function of scavenging free radicals, reducing skin redness, inflammation and other discomfort symptoms, and are suitable for sensitive and easily irritated skin.

[0009] Amino acids and antioxidants in oat kernel protein can promote the repair and regeneration of skin cells, improve the skin's barrier function, and reduce the invasion of external harmful substances. In addition, the natural saponin component in oat kernel protein can gently remove excess oil and dirt on the skin surface, making the skin more translucent and shiny.

[0010] The polysaccharide components of Aphanothece sacrum mainly include monosaccharides such as glucose, galactose, mannose, and rhamnose, which are connected by glycosidic bonds to form a complex sugar chain structure. It has good solubility, can be absorbed by the human body and skin, and forms a relatively stable film on the skin, with various biological functions. The Aphanothece sacrum polysaccharide molecule has rich hydroxyl groups, which can combine with water through hydrogen bonds to form a water hydration layer with strong water retention. This layer can form a thin film on the skin surface to lock in moisture, thereby enhancing the skin's moisture retention. Aphanothece sacrum polysaccharide can also help relieve skin discomfort by inhibiting inflammatory reactions, especially for skin that has been exposed to ultraviolet rays, dryness, or air pollution for a long time.

[0011] The composition of the present invention can provide various nutrients for skin cells through the synergistic effect of four components: Camellia nitidissima flower extract, Ulmus rubra bark extract, oat kernel protein, and Miyokanten polysaccharide. It can effectively promote the transport and absorption of VC in dermal cells, not only synergistically exert antioxidant and anti-inflammatory effects, but also enhance the skin's hydration ability and protect the skin from irritation. They complement each other in the mechanism of action and can achieve the best long-term brightening, barrier repair, and irritation soothing clinical effects in terms of efficacy.

[0012] Preferably, the weight ratio of the Camellia nitidissima flower extract, Ulmus rubra bark extract, oat kernel protein, and Miyokanten polysaccharide is (1 - 8):(1 - 5):(0.1 - 0.5):(0.01 - 0.05).

[0013] More preferably, the weight ratio of the Camellia nitidissima flower extract, Ulmus rubra bark extract, oat kernel protein, and Miyokanten polysaccharide is (1 - 5):(1 - 3):(0.1 - 0.3):(0.01 - 0.03).

[0014] In a second aspect, the present invention provides the application of the skin brightening composition containing Camellia nitidissima flower extract in the first aspect in the preparation of cosmetics suitable for dry and sensitive skin.

[0015] Preferably, the cosmetics are lotion, emulsion, cream, mask, essence, or spray, and the addition amount of the composition is 1% - 3% of the total weight of the cosmetics.

[0016] In a third aspect, the present invention provides an essence, which includes the following raw materials in weight percentages: 1% - 3% of the skin brightening composition described in the first aspect, 0.05% - 0.5% thickener, 3% - 20% humectant, 0.2% - 5% preservative, 0.05% - 0.1% pH regulator, and 0.01% - 1% fragrance, with the balance being deionized water.

[0017] Preferably, the thickener includes at least one of xanthan gum, Carbopol 940, AVC, and high molecular cellulose.

[0018] Preferably, the humectant includes at least one of allantoin, sodium polyacrylate, hydrogenated lecithin, betaine, β - glucan, trehalose, caprylyl glycol, dipropylene glycol, sodium hyaluronate, 1,2 - butanediol, glycerol, Aureobasidium pullulans polysaccharide, and ceramide.

[0019] Preferably, the pH regulator includes arginine and / or sodium hydroxide.

[0020] Preferably, the preservative includes at least one of 1,2 - propylene glycol, 1,2 - hexanediol, and p - hydroxyacetophenone.

[0021] In a fourth aspect, the present invention improves the method for preparing the essence liquid described in the third aspect, comprising the following steps:

[0022] S1. Mix a humectant, a thickener and a part of deionized water, homogenize at 75 - 85°C, and then add a preservative and stir evenly to obtain a mixture;

[0023] S2. When the temperature of the mixture in S1 drops to 35 - 45°C, add each component in the skin brightening composition, essence and the remaining deionized water, stir evenly, and finally add a pH regulator to adjust the pH to obtain the essence liquid.

[0024] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0025] The components of the skin brightening composition of the present invention are four components: Camellia nitidissima leaf extract, Ulmus rubra bark extract, Avena sativa kernel protein and Monostroma nitidum polysaccharide. Their synergy can provide various nutrients for skin cells, effectively promote the transport and absorption of VC in dermal cells, not only can synergistically play antioxidant and anti-inflammatory effects, but also can enhance the skin's hydration ability and protect the skin from irritation. They complement each other in the mechanism of action and can achieve the best long-term brightening, barrier repair and soothing irritation clinical effects in terms of efficacy. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 Comparison chart of skin redness of the subjects using the essence liquid of Application Example 1 at 0 day and 14 days

[0027] Figure 2 Comparison chart of skin redness of the subjects using the essence liquid of Comparative Application Example 5 (blank control group) at 0 day and 14 days;

[0028] Figure 3 Comparison chart of skin brightness of the subjects using the essence liquid of Application Example 1 at 0 day and 14 days;

[0029] Figure 4 Comparison chart of skin brightness of the subjects using the essence liquid of Comparative Application Example 5 (blank control group) at 0 day and 14 days; DETAILED DESCRIPTION OF THE INVENTION

[0030] To better illustrate the purpose, technical solution and advantages of the present invention, the present invention will be further described below in conjunction with specific embodiments.

[0031] The sources of the materials used in the following examples and comparative examples are as follows:

[0032] Ulmus rubra bark extract: The manufacturer is Guangzhou Aoxue Biotechnology Co., Ltd.;

[0033] Oat kernel protein: The manufacturer is Shaanxi Desert Three Treasures Biotechnology Co., Ltd.;

[0034] Camellia nitidissima flower extract: The manufacturer is Cxy(Amoy) Biotechnology Co., Ltd.;

[0035] Sphaerococcus exiguus polysaccharide: The manufacturer is Shandong Shoucheng Chemical Co., Ltd.

[0036] Other materials, reagents, etc. used in the examples can be obtained from commercial channels without special instructions.

[0037] Example 1

[0038] A skin brightening composition containing Camellia nitidissima flower extract, comprising Camellia nitidissima flower extract, Ulmus macrocarpa Hance bark extract, oat kernel protein and Sphaerococcus exiguus polysaccharide in a weight ratio of 3:2:0.2:0.02, and the total mass fraction of the Camellia nitidissima flower extract, Ulmus macrocarpa Hance bark extract, oat kernel protein and Sphaerococcus exiguus polysaccharide is 100 parts.

[0039] Example 2

[0040] A skin brightening composition containing Camellia nitidissima flower extract, comprising Camellia nitidissima flower extract, Ulmus macrocarpa Hance bark extract, oat kernel protein and Sphaerococcus exiguus polysaccharide in a weight ratio of 1:3:0.3:0.01, and the total mass fraction of the Camellia nitidissima flower extract, Ulmus macrocarpa Hance bark extract, oat kernel protein and Sphaerococcus exiguus polysaccharide is 100 parts.

[0041] Example 3

[0042] A skin brightening composition containing Camellia nitidissima flower extract, comprising Camellia nitidissima flower extract, Ulmus macrocarpa Hance bark extract, oat kernel protein and Sphaerococcus exiguus polysaccharide in a weight ratio of 5:1:0.1:0.03, and the total mass fraction of the Camellia nitidissima flower extract, Ulmus macrocarpa Hance bark extract, oat kernel protein and Sphaerococcus exiguus polysaccharide is 100 parts.

[0043] Example 4

[0044] A skin brightening composition containing Camellia nitidissima flower extract, comprising Camellia nitidissima flower extract, Ulmus macrocarpa Hance bark extract, oat kernel protein and Sphaerococcus exiguus polysaccharide in a weight ratio of 1:1:0.5:0.05, and the total mass fraction of the Camellia nitidissima flower extract, Ulmus macrocarpa Hance bark extract, oat kernel protein and Sphaerococcus exiguus polysaccharide is 100 parts.

[0045] Example 5

[0046] A skin-whitening composition containing camellia nitidissima extract, comprising camellia nitidissima flower extract, smooth elm bark extract, oat kernel protein and agar-agar polysaccharide in a weight ratio of 8:5:0.1:0.01, and the total mass fraction of the camellia nitidissima flower extract, smooth elm bark extract, oat kernel protein and agar-agar polysaccharide is 100 parts.

[0047] Example 6

[0048] A skin-whitening composition containing camellia nitidissima extract, comprising camellia nitidissima flower extract, smooth elm bark extract, oat kernel protein and agar-agar polysaccharide in a weight ratio of 1:8:1:0.1, and the total mass fraction of the camellia nitidissima flower extract, smooth elm bark extract, oat kernel protein and agar-agar polysaccharide is 100 parts.

[0049] Example 7

[0050] A skin-whitening composition containing camellia nitidissima extract, comprising camellia nitidissima flower extract, smooth elm bark extract, oat kernel protein and agar-agar polysaccharide in a weight ratio of 10:1:0.1:0.01, and the total mass fraction of the camellia nitidissima flower extract, smooth elm bark extract, oat kernel protein and agar-agar polysaccharide is 100 parts.

[0051] Comparative Example 1

[0052] The difference between Comparative Example 1 and Example 1 is that: the composition does not add camellia nitidissima flower extract, and the missing amount is supplemented with smooth elm bark extract, oat kernel protein and agar-agar polysaccharide in a mass ratio of 2:0.2:0.02.

[0053] Comparative Example 2

[0054] The difference between Comparative Example 2 and Example 1 is that: the composition does not add smooth elm bark extract, and the missing amount is supplemented with camellia nitidissima flower extract, oat kernel protein and agar-agar polysaccharide in a weight ratio of 3:0.2:0.02.

[0055] Comparative Example 3

[0056] The difference between Comparative Example 3 and Example 1 is that: the composition does not add oat kernel protein, and the missing amount is supplemented with camellia nitidissima flower extract, smooth elm bark extract and agar-agar polysaccharide in a weight ratio of 3:2:0.02.

[0057] Comparative Example 4

[0058] The difference between Comparative Example 4 and Example 1 is that: the composition does not add agar-agar polysaccharide, and the missing amount is supplemented with camellia nitidissima flower extract, smooth elm bark extract and oat kernel protein in a weight ratio of 3:2:0.2.

[0059] Test Example 1: Test on the Efficacy of Promoting VC Absorption

[0060] The compositions of Examples 1-7 and Comparative Examples 1-4 were set as 11 groups of test sample groups, and the experiment was carried out according to the following steps. The specific steps are as follows:

[0061] (1) Cell culture: Human dermal fibroblasts (HDF) were cultured in Dulbecco's Modified Eagle Medium (DMEM), which contained 4500 mg / L glucose, penicillin-streptomycin double-antibody solution (the concentration of each of the two antibiotics was 100 U / ml, purchased from Thermo Fisher), 10% (v / v) fetal bovine serum and 0.584 g / L glutamine. Then they were placed in a 12-well culture dish and cultured until confluence. The cells were cultured to the 8th passage for the experiment, and the cultured HDF cells were obtained. The cells were washed twice with PBS before use to obtain a cell culture medium containing 2×10 5 cells / well of HDF cells.

[0062] (2) 14 Preparation of the stock solution of 14 C-labeled ascorbic acid: 1.85 MBq of 14 C was dissolved in 77 μL of transfer buffer (140 mM NaCl, 4.2 mM KHCO3, 5.8 mM KCl, 1.3 mM CaCl2, 0.5 mM MgCl2, 10 mM Hepes, 1 wt% penicillin-streptomycin double-antibody solution, 0.1 mM DTT), and then ascorbic acid was added to obtain a stock solution of

[0063] C-labeled ascorbic acid, wherein the concentration of ascorbic acid in the stock solution was 50 mM. 14 (3) Preparation of the test samples: The test solution of the sample group was a cell culture medium containing 250 μg / mL of the skin-lightening composition and 100 μM of 14 C-labeled ascorbic acid stock solution; the test solution of the blank group was a cell culture medium containing 100 μM of

[0064] (4) VC absorption test: The test solutions of the sample group and the blank group were incubated at 37 °C for 60 min. Immediately after the incubation of each group was completed, the cells were placed on ice for lysis to obtain a lysate. After centrifugation, the supernatant was taken and frozen, washed twice with ice-cold PBS, and finally stored by adding urea buffer. The amount of the radioactive label in the supernatant was quantified by the liquid scintillation counter method. The greater the amount of the radioactive label, the greater the VC absorption. The calculation formula for the VC absorption promotion rate is shown in the following formula:

[0065] VC absorption promotion rate = |amount of radioactive marker in sample group - amount of radioactive marker in blank group| / amount of radioactive marker in blank group × 100%. The data are shown in Table 1.

[0066] Table 1 Data of VC absorption promotion rate of samples in each group

[0067] Group VC Absorption Enhancement Rate / % Example 1 45.39 Example 2 44.38 Example 3 44.47 Example 4 42.25 Example 5 42.53 Example 6 38.42 Example 7 38.16 Comparative Example 1 15.27 Comparative Example 2 16.60 Comparative Example 3 17.39 Comparative Example 4 18.89

[0068] This test directly verifies the effect that the composition can promote the rate of VC absorption by dermal cells by detecting the amount of radioactive marker in dermal cells.

[0069] From the data of Example 1 and Comparative Examples 1 - 4 in Table 1, it can be seen that the composition of Example 1 with the four components of Camellia nitidissima leaf extract, Ulmus virens bark extract, oat kernel protein and Sphaerococcus euchema polysaccharide compounded has a significant improvement in VC absorption promotion rate compared with the compositions of Comparative Examples 1 - 4, indicating that the four components of Camellia nitidissima leaf extract, Ulmus virens bark extract, oat kernel protein and Sphaerococcus euchema polysaccharide have a synergistic effect. By promoting the rate of VC absorption by dermal cells, it improves the VC transport efficiency and achieves the effect of prolonging skin brightening.

[0070] Combined with the data of Examples 1 - 7, it can be known that when the weight ratio of Camellia nitidissima leaf extract, Ulmus virens bark extract, oat kernel protein and Sphaerococcus euchema polysaccharide is (1 - 5):(1 - 3):(0.1 - 0.3):(0.01 - 0.03), the composition has a better effect in promoting VC absorption by dermal cells.

[0071] Application Examples 1 - 7 and Comparative Application Examples 1 - 4

[0072] The compositions of Examples 1 - 7 and Comparative Examples 1 - 4 were respectively added to the essence at a concentration of 1 wt%, and the essences of Application Examples 1 - 7 and Comparative Application Examples 1 - 4 were obtained. The formula is shown in Table 2.

[0073] The preparation methods of the essences of Application Examples 1 - 7 and Comparative Application Examples 1 - 4 include the following steps:

[0074] The preparation method of the essence includes the following steps:

[0075] S1. Mix the humectant, thickener and 1 / 2 amount of deionized water, homogenize evenly at 80 °C, then add the preservative and stir evenly to obtain a mixture;

[0076] S2. Wait until the temperature of the mixture in S1 drops to 40 °C, add each component in the skin brightening composition, essence and the remaining deionized water, stir evenly, and finally add the pH regulator to adjust the pH to 6 to obtain the essence.

[0077] Table 2 Essence Formulas of Application Examples 1-7 and Comparative Application Examples 1-4

[0078]

[0079] Comparative Application Example 5

[0080] For the essence in Comparative Application Example 5, the skin brightening composition is not added, and an equal amount of deionized water is used to replace the composition. The preparation method is the same as that of Application Example 1.

[0081] Test Example 2: Efficacy Test of Essence

[0082] This test example verifies the effects of the essences of Application Examples 1-7 and Comparative Application Examples 1-5 on soothing and brightening the skin. The experimental data are shown in Table 3.

[0083] According to the "Technical Specifications for Cosmetics Safety" (2015), 60 volunteers aged 18-45 with dry and sensitive skin (lactic acid stinging score > 3, skin moisture content 20 C.U - 50 C.U) were selected and randomly divided into 12 groups with 5 people in each group. Under normal circumstances, the volunteers used the products on the whole face. The volunteers took an appropriate amount of lotion and applied it to the face and massaged it until absorbed. The volunteers were in an air-conditioned room with a temperature of 21 ± 1°C and a humidity of 50 ± 10%, and instruments were used to quantitatively measure and photograph the improvement of facial indicators. The test time was the indicators before use, 1 day after use, and 14 days after use: a Skin-Glossymeter GL 200 skin detector was used to measure skin brightness, a TewameterTM Hex transdermal water loss and water evaporation heat loss test probe was used to measure the transdermal water loss TEWL value, and a Skin-Colorimeter CL400 skin color difference test probe and Visia 7 (IPP) were used to measure skin redness.

[0084] The calculation formulas are as follows:

[0085] Improvement rate of TEWL value = (TEWL value 使用后 - TEWL value 使用前 ) / TEWL value 使用前 × 100%;

[0086] Improvement rate of brightness = (brightness 使用后 - brightness 使用前 ) / brightness before use × 100%;

[0087] Improvement rate of redness = (redness 使用前 - redness 使用后 ) / redness before use × 100%.

[0088] The calculation results are shown in Table 3.

[0089] Table 3 Human Efficacy Test Data of Essence Samples in Each Group

[0090]

[0091]

[0092] The soothing effect on facial flushing of the application example is represented by the redness improvement rate, the repair effect on barrier damage is represented by the TEWL value improvement rate, and the skin tone brightening effect is represented by the brightness improvement rate.

[0093] It can be seen from Figures 1-4 that after 14 days of use of the essence of Application Example 1, the facial flushing condition and the facial brightening effect of the subjects have been significantly improved compared with Comparative Application Example 5, indicating that the essence added with the skin tone brightening composition has good effects of soothing flushing and brightening the skin tone.

[0094] It can be seen from the data of Application Example 1 and Comparative Application Examples 1-4 in Table 3 that the composition of Example 1 formulated by compounding four components of Camellia nitidissima leaf extract, Ulmus parvifolia Jacq. bark extract, Avena sativa kernel protein and Agarophyton vermiculophyllum polysaccharide has significantly improved soothing effect on facial flushing and skin tone brightening effect compared with the compositions of Comparative Examples 1-4, indicating that these four components of Camellia nitidissima leaf extract, Ulmus parvifolia Jacq. bark extract, Avena sativa kernel protein and Agarophyton vermiculophyllum polysaccharide can synergistically achieve the effects of long-term brightening, barrier repair and soothing irritation.

[0095] Combined with the data of Application Examples 1-7, it can be known that when the weight ratio of Camellia nitidissima leaf extract, Ulmus parvifolia Jacq. bark extract, Avena sativa kernel protein and Agarophyton vermiculophyllum polysaccharide is (1-5):(1-3):(0.1-0.3):(0.01-0.03), the barrier repair, soothing and skin tone brightening effects of the composition are better.

[0096] In summary, the skin tone brightening composition of the present invention synergistically promotes the absorption rate of VC by dermal cells through four components of Camellia nitidissima leaf extract, Ulmus parvifolia Jacq. bark extract, Avena sativa kernel protein and Agarophyton vermiculophyllum polysaccharide, improves the VC transport efficiency, achieves the effect of prolonging the skin brightening effect, and at the same time can endogenously promote the vitality of dermal cells, and plays the roles of repairing the barrier and soothing irritation.

[0097] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit the protection scope of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A skin lightening composition containing golden camellia extract, characterized in that: The invention comprises the following components: golden camellia extract, elm bark extract, oat kernel protein and laver polysaccharide, wherein the weight ratio of the golden camellia extract, elm bark extract, oat kernel protein and laver polysaccharide is (1-10): (1-8): (0.1-1): (0.01-0.1).

2. The skin lightening composition containing the Camellia chrysantha extract according to claim 1, characterized in that: The weight ratio of the Camellia chrysantha extract, the Ulmus pumila bark extract, the oat kernel protein and the Porphyra sutchuenensis polysaccharide is (1-8): (1-5): (0.1-0.5): (0.01-0.05).

3. The skin lightening composition containing the Camellia chrysantha extract according to claim 1, characterized in that: The weight ratio of the Camellia chrysantha extract, the Ulmus pumila bark extract, the oat kernel protein and the Porphyra sutchuenensis polysaccharide is (1-5): (1-3): (0.1-0.3): (0.01-0.03).

4. Use of the skin-lightening composition containing the Camellia chrysantha extract according to any one of claims 1 to 3 in preparing cosmetics suitable for dry and sensitive skin.

5. Use of the skin-lightening composition containing the camellia chrysantha extract according to claim 4 in preparing cosmetics suitable for dry and sensitive skin, characterized in that: The cosmetics are lotions, emulsions, creams, facial masks, essences or sprays, and the added amount of the composition is 1%-3% of the total weight of the cosmetics.

6. An essence, characterized in that: The invention comprises the following raw materials in weight percentage: 1%-3% of the skin lightening composition according to any one of claims 1 to 3, 0.05%-0.5% of a thickener, 3%-20% of a moisturizer, 0.2%-5% of a preservative, 0.05%-0.1% of a pH regulator and 0.01%-1% of an essence, and the balance is deionized water.

7. The essence according to claim 6, characterized in that The raw material is selected from at least one of (a) to (d): (a) the thickener comprises at least one of xanthan gum, Carbopol 940, AVC, and polymer cellulose; (b) the moisturizing agent comprises at least one of allantoin, sodium polyacrylate, hydrogenated lecithin, betaine, β-glucan, trehalose, caprylyl glycol, dipropylene glycol, sodium hyaluronate, 1,2-butylene glycol, glycerol, budding pullulan polysaccharide, and ceramide; (c) the pH adjusting agent comprises arginine and / or sodium hydroxide; (d) The preservative includes at least one of 1,2-propylene glycol, 1,2-hexanediol and p-hydroxyacetophenone.

8. The method for preparing the essence according to claim 7, characterized in that: The following steps are involved: S1. Mix a moisturizer, a thickener and part of deionized water, homogenize at 75-85° C., add a preservative, and stir evenly to obtain a mixture; S2. When the temperature of the mixture in S1 drops to 35-45° C., add the components of the skin lightening composition, the essence and the remaining deionized water, stir evenly, and finally add a pH adjuster to adjust the pH to obtain the essence.

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