A scalp oil-controlling composition containing tea polyphenols, its preparation method and application

Abstract

This invention belongs to the field of daily chemical product technology, and particularly relates to a scalp oil-control composition containing tea polyphenols, its preparation method, and its application. The composition comprises the following components in weight percentages: 10-50% plant oil, 0.01-15% water-in-oil emulsifier, 0.01-15% oil-in-water emulsifier, 0.001-5% modified tea polyphenol nanoparticles, and the balance being water. This invention uses a water-in-oil emulsion as the base form, with modified tea polyphenol nanoparticles as the internal phase, effectively improving the stability of tea polyphenols; simultaneously, the addition of an oil-in-water emulsifier modifies the emulsion, forming a water-in-oil-in-water (W / O / W) double emulsion structure to solve the problem of poor solubility in water-in-oil emulsions. Furthermore, through the synergistic effect between the components, this invention can effectively regulate the scalp's oil-water balance, achieving excellent scalp oil control; it also possesses good moisturizing effects, combining the advantages of oil control and gentle care.

Description

Technical Field

[0001] This invention belongs to the field of daily chemical products technology, and in particular relates to a scalp oil-control composition containing tea polyphenols, its preparation method and application. Background Technology

[0002] The scalp is an important part of human skin, with an area of ​​650-700 cm². 2 Scalp oil is rich in nutrients such as moisture and sebum. Scalp oil, secreted by the sebaceous glands and keratinocytes on the scalp, plays a vital role in maintaining scalp health, including retaining moisture, nourishing the scalp, and protecting against UV damage. However, the scalp has a large number of sebaceous glands, secretes oil rapidly, and is constantly covered by hair, making it more prone to oiliness. This can lead to a range of problems, including itching, inflammation, excessive oil production, and hair loss. Therefore, hair care products that effectively cleanse and control scalp oil are particularly important.

[0003] Most products on the market achieve scalp oil control primarily by adding chemical ingredients. In recent years, with the improvement of people's consumption level and concepts, and the strengthening of safety awareness, consumers are increasingly pursuing the natural care functions of products. Plant extracts with natural and safe characteristics are gradually being used in various hair care products.

[0004] Tea polyphenols are the most abundant active ingredients in tea, representing a general term for polyphenolic substances in tea, which can be classified into catechins, anthocyanins, flavonoids, and phenolic acids. Numerous studies have shown that tea polyphenols possess biological activities such as promoting keratinocyte growth, antibacterial activity, antioxidant activity, and anti-inflammatory activity, demonstrating significant research and application value in the field of human health. Tea polyphenols reduce sebum secretion by regulating the AMPK (adenosine monophosphate-activated protein) / SREBP-1 (sterol regulatory element-binding protein-1) signaling pathway, thus exhibiting a certain oil-controlling effect. However, tea polyphenols have low stability and are easily degraded by factors such as temperature, oxygen, pH, and metal ions. Therefore, tea polyphenols face many challenges in practical applications, thus limiting their use in relevant fields.

[0005] Chinese patent publication CN115414300A discloses a green tea compound fermentation liquid with antioxidant, oil-controlling, and pore-shrinking effects, its preparation method, and its application. Fermentation improves the stability of tea polyphenols, and the pH of the fermentation liquid needs to be between 3 and 4 to achieve good oil-controlling and antioxidant effects. Chinese patent publication CN118045015A discloses a nanocomposition with long-lasting oil-controlling function, its preparation, and its application. This composition uses cationic polymers to encapsulate various active ingredients such as tea polyphenols, resulting in a small particle size, high encapsulation rate, and good oil-controlling effect. However, the polymerization method of cationic polymers is complex, and the resulting cationic polymers are not listed in the cosmetics catalog, making future application in cosmetics difficult.

[0006] In addition, as a polar polyphenol, tea polyphenols have extremely low solubility in the oil phase. Since most hair care products are water-oil emulsion systems, the low oil solubility of tea polyphenols makes it difficult for them to be evenly dispersed in the system, which further affects the full realization of their oil-controlling effect. This is one of the technical problems that urgently need to be solved in the application of tea polyphenols in scalp oil-controlling hair care products. Summary of the Invention

[0007] The purpose of this invention is to overcome the shortcomings of the prior art and provide a scalp oil-control composition containing tea polyphenols, its preparation method, and its application. This invention uses a water-in-oil emulsion as a base, with modified tea polyphenol nanoparticles as the internal phase, effectively improving the stability of the tea polyphenols. Given that water-in-oil emulsions have an oil phase as the external phase and poor solubility in most systems, this invention further adds a water-in-oil emulsifier to modify it, ultimately forming a water-in-oil-in-water (W / O / W) double emulsion structure. Furthermore, through the synergistic effect between the components, this invention can effectively regulate the scalp's oil-water balance after application, achieving excellent scalp oil control; it also possesses good soothing and moisturizing effects, enhancing the scalp's hydration capacity, forming a moisture-protective film on the scalp surface, continuously locking in moisture, and counteracting the astringent and drying effects that oil-controlling ingredients may cause, thus combining the dual advantages of oil control and gentle care.

[0008] To achieve the above objectives, the technical solution adopted by the present invention includes:

[0009] In a first aspect, the present invention provides a scalp oil-controlling composition containing tea polyphenols, comprising the following components in weight percentages: 10-50% plant oil, 0.01-15% water-in-oil emulsifier, 0.01-15% oil-in-water emulsifier, 0.001-5% modified tea polyphenol nanoparticles, and the balance being water.

[0010] The vegetable oil has an oleic acid content of ≥70% and a linoleic acid content of ≤25%.

[0011] More preferably, the scalp oil-control composition comprises the following components in weight percentage: 40-45% vegetable oil, 2.5-3% water-in-oil emulsifier, 1.5-2% oil-in-water emulsifier, 2.5-3% tea polyphenol modified nanoparticles, and the balance being water.

[0012] Preferably, the vegetable oil is at least one of olive fruit oil, camellia seed oil, and avocado oil.

[0013] Preferably, the water-in-oil emulsifier is at least one selected from oleamide propyl dimethylamine, stearamide propyl dimethylamine, and behenamidopropyl dimethylamine.

[0014] Preferably, the oil-in-water emulsifier includes at least one of PEG-40 hydrogenated castor oil, PEG-60 hydrogenated castor oil, glyceryl stearate, and glyceryl cocoate.

[0015] Preferably, the preparation method of the tea polyphenol modified nanoparticles includes the following steps:

[0016] Hyaluronic acid was dissolved in water, and an ethanol solution containing salicylic acid was added. Then, 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide and N-hydroxysuccinimide were added and stirred to activate the mixture. Hydrolyzed keratin was then added and stirred to react. Tea polyphenols were then added, and the mixture was heated and stirred to react. Finally, ethanol was added, and the mixture was precipitated, centrifuged, washed, and dried to obtain tea polyphenol-modified nanoparticles.

[0017] Tea polyphenols can significantly reduce scalp sebum secretion, improve the environment of oily scalp, stimulate scalp blood circulation, activate hair follicle cell activity, and promote hair follicle growth. Simultaneously, as a powerful natural antioxidant, tea polyphenols can scavenge free radicals, prevent oxidative damage to scalp cells, and slow down the scalp aging process. This helps maintain healthy hair follicles and prevent premature graying and aging of hair. Tea polyphenols also have significant anti-inflammatory, antibacterial, and antiviral effects, effectively alleviating scalp problems such as dandruff and scalp dermatitis. However, tea polyphenols are easily oxidized, have poor stability, and can easily cause scalp dryness, increased dandruff, and some irritation, affecting their application.

[0018] This invention prepares tea polyphenol-modified nanoparticles with a particle size of less than 100 nm, exhibiting significantly improved performance in terms of stability and bioavailability. Using hydrolyzed keratin-modified water-soluble hyaluronic acid as a carrier, salicylic acid is grafted onto the nanoparticles via a reaction, and tea polyphenol monomers are encapsulated in a self-assembled nanostructure to form a stable tea polyphenol nanoparticle system. This system possesses certain lipid-soluble penetrating properties, allowing it to penetrate deep into hair follicles to dissolve accumulated sebum and oil residue. By dissolving unnecessary sebum secretion on the skin surface, it effectively reduces scalp oil production and also exhibits good anti-inflammatory properties, deeply cleansing hair follicles and reducing closed comedones and inflammatory acne. The introduction of hyaluronic acid gives the nanoparticles good soothing and moisturizing effects, enhancing hydration capacity and retaining moisture on the scalp surface, counteracting the astringent and drying effects. Simultaneously, the grafting of salicylic acid significantly reduces its sensitizing properties, while improving the stability and reducing the irritation of the tea polyphenols.

[0019] Preferably, the mass ratio of hyaluronic acid, salicylic acid, 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide, N-hydroxysuccinimide, hydrolyzed keratin, and tea polyphenols is 1:(0.2-0.3):(0.02-0.025):(0.021-0.027):(0.1-0.2):(0.4-0.6).

[0020] Preferably, the stirring activation time is 20-30 min, the stirring reaction time is 10-14 h, and the heating stirring reaction temperature is 40-50℃ for 1-2 h.

[0021] Preferably, the hydrolyzed keratin has a molecular weight of 300-2000 Da.

[0022] Secondly, the present invention provides a method for preparing the aforementioned scalp oil-controlling composition, comprising the following steps:

[0023] S1. Mix vegetable oil with water-in-oil emulsifier and heat to 50-80℃ to form phase A;

[0024] S2. Mix the modified tea polyphenol nanoparticles with water to form phase B. Mix phase A and phase B and homogenize at a homogenization speed of 400-4000 rpm for 3-10 min to obtain the primary emulsion.

[0025] S3. Homogenize the primary emulsion 1-5 times in a high-pressure microfluidic homogenizer at a homogenization pressure of 5-12 kbar to obtain a water-in-oil emulsion.

[0026] S4. The obtained water-in-oil emulsion is mixed with an oil-in-water emulsifier and water, and homogenized at a homogenization speed of 200-1500 rpm for 3-10 minutes to obtain the scalp oil control composition.

[0027] Thirdly, the present invention provides the application of the scalp oil-control composition in the preparation of hair care products.

[0028] Preferably, the hair care products include scalp serum, shampoo, conditioner, or hair spray.

[0029] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0030] (1) The present invention uses a W / O / W dual emulsion form to encapsulate tea polyphenol modified nanoparticles, which has high encapsulation efficiency for tea polyphenols, effectively isolates tea polyphenols from the external environment, greatly improves the storage and use stability of tea polyphenols, fully preserves their biological activity, and enables them to continuously exert excellent oil control effects in shampoo and conditioner products, thus solving the technical problem that tea polyphenols are easily deactivated by the external environment and the oil control effect is reduced.

[0031] (2) The present invention limits the vegetable oil to a high oleic acid and low linoleic acid type with oleic acid content ≥70% and linoleic acid content ≤25%. Stable water-in-oil emulsions can be prepared by combining it with a specific water-in-oil emulsion agent. At the same time, the water-in-oil emulsion is further coated by the water-in-oil emulsion agent, which not only solves the problem that vegetable oils are more prone to oxidation than synthetic oils, but also significantly improves the stability of vegetable oils. It also ensures the structural stability of the entire W / O / W emulsion system and avoids problems such as system stratification and demulsification. Moreover, high oleic acid vegetable oils are easily absorbed by the skin and hair, and have a transdermal absorption promoting effect, which can enhance the transdermal absorption effect of tea polyphenols and give full play to the synergistic effect of vegetable oils and tea polyphenols.

[0032] (3) In this invention, high oleic acid plant oil, compound emulsifier, and tea polyphenol modified nanoparticles are precisely proportioned and a W / O / W emulsion system is constructed. The components form a synergistic effect: the plant oil serves as the base of the emulsion oil phase, acts as a transdermal penetration promoter to help tea polyphenols penetrate, and works with the cationic emulsifier to achieve the adsorption and retention of the emulsion; the compound emulsifier ensures the stability of the emulsion system and optimizes the skin feel and formula solubility; the tea polyphenol modified nanoparticles rely on the emulsion to achieve activity retention and play a core oil control role. The functions of each component are complementary and the effects are superimposed. Compared with single-component oil control formulas, the oil control effect is better.

[0033] (4) The oil phase exposed after the composition of the present invention is kneaded and demulsified relies on the lipophilic structure of the scalp stratum corneum and the characteristics of high oleic acid plant oils to easily stay on the scalp and carry tea polyphenols to penetrate into deeper cells of the scalp, thereby achieving long-lasting oil control at the scalp level; on the other hand, the use of cationic oil-in-water emulsifiers makes the emulsion positively charged, and by utilizing the negatively charged and lipophilic properties of hair, some of the emulsion is adsorbed and stays on the hair roots, forming a protective film on the hair roots, inhibiting the secretion of scalp oil from the source, and achieving dual oil control of the scalp and hair roots, with a more comprehensive and lasting oil control effect;

[0034] (5) This invention effectively reduces the greasiness of the oil-in-water emulsion itself by using the encapsulation effect of the water-in-oil emulsion, significantly improving the scalp refreshment when using the composition, and avoiding the sticky discomfort caused by traditional oil-based oil-control formulas; at the same time, the plant oils selected in the composition are of natural origin, with mild and biodegradable characteristics, and also contain natural antioxidant active ingredients such as tocopherol and flavonoids, which are non-irritating, suitable for delicate scalp skin, and have higher safety in use; in addition, the emulsion system after being encapsulated by the water-in-oil emulsifier has significantly improved solubility, and can be compatible with most shampoo and conditioner product systems, without the need for major adjustments to existing shampoo and conditioner product formulas, and can be added for application; and the composition can be widely used in various shampoo and conditioner products such as scalp serums, shampoos, conditioners, and hair sprays. Attached Figure Description

[0035] Figure 1 The graph shows the subject evaluation results after using the serum described in Example 1 and Comparative Examples 2-3;

[0036] Figure 2 The graph shows the subject evaluation results after using the shampoo described in Example 2 and Comparative Examples 5-6. Detailed Implementation

[0037] To better illustrate the objectives, technical solutions, and advantages of this invention, the invention will be further described below with reference to specific embodiments. Those skilled in the art should understand that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0038] Unless otherwise specified, the experimental methods used in the following examples and comparative examples are conventional methods, and the raw materials used in the following examples and comparative examples are all available through conventional commercial channels.

[0039] The preparation methods of the tea polyphenol-modified nanoparticles described in the following examples and comparative examples are as follows:

[0040] 1 g of hyaluronic acid was dissolved in 100 mL of water, and 20 mL of ethanol solution containing 0.25 g of salicylic acid was added. 22 mg of 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide (EDC) and 25 mg of N-hydroxysuccinimide (NHS) were added, and the mixture was stirred and activated for 25 min. 0.15 g of hydrolyzed keratin (Mw=1000 Da) was added, and the mixture was stirred and reacted for 12 h. Then, tea polyphenols were added, and the mixture was heated to 45 °C and stirred and reacted for 1.5 h. The mixture was then added to 200 mL of ethanol, and the mixture was allowed to precipitate for 1 h. After centrifugation, washing, and drying, tea polyphenol-modified nanoparticles were obtained. The average particle size of the obtained product was between 60-70 nm.

[0041] Examples 1-3, Comparative Examples 1-2:

[0042] Examples 1-3 and Comparative Examples 1-2 each provide an emulsion composition containing tea polyphenols. The raw materials and their mass percentages in the compositions are shown in Table 1.

[0043] Table 1. Formulations for Examples 1-3 and Comparative Examples 1-2 (Unit: %)

[0044]

[0045] According to the formulation shown in Table 1, vegetable oil and water-in-oil emulsifier are mixed and heated to 60°C to form phase A; then, tea polyphenol modified nanoparticles and water are mixed to form phase B. After mixing phase A and phase B, the mixture is homogenized at 1500 rpm for 8 min to obtain a primary emulsion; the primary emulsion is homogenized three times in a high-pressure microfluidic homogenizer at a homogenization pressure of 9 kbar to obtain a water-in-oil emulsion; then, the emulsion is mixed with oil-in-water emulsifier and water, and homogenized at 500 rpm for 4 min to obtain the final tea polyphenol W / O / W emulsion composition.

[0046] The stability of an emulsion is determined by the change in emulsion particle size; the smaller the change in particle size, the more stable the emulsion. The stability test results for each example and comparative example are shown in Table 2.

[0047] Table 2. Stability test results of Examples 1-3 and Comparative Examples 1-2

[0048]

[0049] Note: √ indicates that the sample is stable and has hardly changed compared to its initial appearance.

[0050] According to Stockes' law, the smaller the emulsion particle size, the greater the viscosity of the continuous phase, the lower the sedimentation or ascent rate of the emulsion, and the more stable the emulsion. Therefore, particle size reflects the stability of the emulsion. Table 2 shows that the particle size of the emulsions in Examples 1-3 hardly changed during storage, indicating that no aggregation or demulsification occurred. Comparative Examples 1-2 show that the emulsifying properties in this composition are weak, and the resulting emulsion stability is poor; therefore, the composition is unstable during accelerated storage.

[0051] Examples 4-6, Comparative Examples 3-5:

[0052] Examples 4-6 and Comparative Examples 3-5 each provide an emulsion composition containing tea polyphenols. The raw materials and their mass percentages in the compositions are shown in Table 3.

[0053] Table 3. Formulations for Examples 4-6 and Comparative Examples 3-5 (Unit: %)

[0054]

[0055] According to the formulation shown in Table 3, the oil and water-in-oil emulsifier are mixed and heated to 65°C to form phase A; then, tea polyphenols and water are mixed to form phase B. After mixing phases A and B, the mixture is homogenized at 2500 rpm for 5 min to obtain the primary emulsion; the primary emulsion is homogenized 5 times in a high-pressure microfluidic homogenizer at a homogenization pressure of 10 kbar to obtain the water-in-oil emulsion; then, the emulsion is mixed with oil-in-water emulsifier and water, and homogenized at 400 rpm for 5 min to obtain the final tea polyphenol W / O / W emulsion composition.

[0056] The stability of an emulsion is determined by the change in emulsion particle size; the smaller the change in particle size, the more stable the emulsion. The stability test results for each example and comparative example are shown in Table 4.

[0057] Table 4. Stability test results of Examples 4-6 and Comparative Examples 3-5

[0058]

[0059] Note: √ indicates that the sample is stable and has hardly changed compared to its initial appearance.

[0060] In Comparative Examples 3-4, the oleic acid content of peanut oil and grapeseed oil was 48% and 27%, respectively, and the linoleic acid content was 40% and 64%, respectively. Table 4 shows that when the oleic acid content of the vegetable oils is low and the linoleic acid content is high, the stability of the composition decreases, and demulsification is more likely to occur during storage. This is because, compared to linoleic acid, oleic acid has fewer double bonds, a more rigid molecular structure, and is more easily bound tightly to emulsifiers. Furthermore, oleic acid has better lipophilicity than linoleic acid, and when oleic acid reaches a certain amount, it is more conducive to the formation of a water-in-oil emulsion, thereby improving the stability of the final W / O / W emulsion composition.

[0061] As shown in Comparative Example 5, adding tea polyphenols to modify nanoparticles can further reduce the emulsion particle size compared to directly adding tea polyphenols, so that the appearance of the sample can remain stable for a long time and the shelf life of the product can be significantly extended.

[0062] Comparative Examples 6-7:

[0063] Comparative Examples 6 and 7 each provide an emulsion composition containing tea polyphenols. The raw materials and their mass percentages in the compositions are shown in Table 5.

[0064] Table 5 Comparative Example 6-7 Formulation Table (Unit: %)

[0065]

[0066] Comparative Example 6 Explanation: Compared with Example 6, no oil-in-water emulsifier was added to the formulation, which means that the composition of Comparative Example 6 is an oil-in-water emulsion.

[0067] Comparative Example 7: Compared to Example 6, the water-in-oil emulsifier stearamide propyl dimethylamine was replaced with Span 80 and Tween 20, which are non-cationic.

[0068] Test Example 1

[0069] The emulsion compositions prepared in Example 6 and Comparative Examples 5-7 were used as test samples to test their performance. The specific test methods and results are shown below.

[0070] 1. Scalp oil content test

[0071] A before-and-after control method was used. Sebumeter SM 815 was used to measure the sebum content of the subjects' scalps before use (D0), after 14 days of use (D14), and after 28 days of use (D28). For each sample group, 20 subjects with high scalp sebum content were randomly selected. Four areas were selected on the subjects' scalps, and each area was measured once. The average value was recorded. During the test period, the subjects applied the product after shampooing, when their hair was semi-dry. The test results for each sample are shown in Table 6.

[0072] Table 6. Test results of scalp oil content for each sample.

[0073]

[0074] As shown in Table 6, compared with the composition of directly compounded tea polyphenols (Comparative Example 5), the composition of Example 6 exhibits a superior scalp oil control effect, confirming that the composition prepared using tea polyphenol-modified nanoparticles has better oil control performance. Furthermore, compared with the results of Comparative Example 6, it can be seen that after secondary encapsulation with a water-in-oil emulsion on the basis of the water-in-oil emulsion, the oil control effect of the sample is further improved, indicating that W / O / W emulsion can reduce the greasiness caused by oil to a certain extent, thereby improving the scalp freshness experience when using the product. In addition, the results of Comparative Example 7 show that the type of emulsifier has a certain impact on the oil control effect of the sample, but the core component that plays the main role in oil control in this type of composition is still the internal phase tea polyphenol-modified nanoparticles.

[0075] 2. Scalp Moisture Content Test

[0076] A before-and-after control method was used. The scalp stratum corneum moisture content of the subjects was tested before use of the composition (D0), 14 days after use (D14), and 28 days after use (D28). A Corneometer CM825 was used to test the moisture content of the test sites. For each sample, 20 subjects with relatively dry scalps were randomly selected. Four areas were selected on the subjects' scalps, and each area was measured once. The average value was recorded. During the test period, the subjects applied the composition product after each shampoo application, waiting until their hair was semi-dry. The test results for each sample are shown in Table 7.

[0077] Table 7. Results of scalp moisture content tests for each sample.

[0078]

[0079] As shown in Table 7, the improvement in scalp moisturizing indicators when using shampoo alone was minimal. While the combination with the compositions of Comparative Examples 5, 6, and 7 all improved scalp moisturizing effects, the results were far less than those when using the composition of Example 6. After use, the scalp moisturizing indicators of Example 6 increased from a baseline value of 21.14% to 37.63% after 28 days, significantly better than the compositions of each comparative example. This fully demonstrates that the composition described in Example 6 can exert a superior scalp moisturizing effect and enable the scalp to achieve a better water-oil balance.

[0080] Application Example 1, Application Comparative Examples 1-3:

[0081] Application Example 1 and Comparative Examples 1-3 each provide a scalp serum, and the raw materials and their mass percentages of the serums are shown in Table 8:

[0082] Table 8. Formulations (unit: %) for Application Example 1 and Comparative Examples 1-3, and results of formulation performance tests.

[0083]

[0084] Note: "OK" in the table indicates that the product has good stability and no layering phenomenon.

[0085] As shown in Table 8, the addition of the emulsion composition described in this invention has no significant effect on the key properties of the scalp serum, such as viscosity, pH value, and stability, confirming that the composition has good solubility in the scalp serum system. Furthermore, combined with the experimental results of Comparative Example 1, it can be seen that the composition without the added oil-in-water emulsifier (Comparative Example 6) exhibited obvious stratification during the stability test after being added to the scalp serum. This indicates that the external phase of the oil-in-water emulsion has weak polarity and limited solubilizing ability in this system. However, after being encapsulated by the oil-in-water emulsifier, the molecular dispersion of the composition is improved, thus exhibiting superior solubility in the scalp serum system.

[0086] Application Example 2, Application Comparative Examples 4-6:

[0087] Application Example 2 and Application Comparative Examples 4-6 each provide a shampoo, and the raw materials and their mass percentages of the shampoos are shown in Table 9:

[0088] Table 9. Formulations (unit: %) for Application Example 2 and Comparative Examples 4-6, and results of formulation performance tests.

[0089]

[0090] Note: "OK" in the table indicates that the product has good stability and no layering phenomenon.

[0091] As shown in Table 9, the emulsion composition of the present invention, when added to shampoo, did not have a significant impact on the key properties of the system, such as foam, viscosity, pH value and stability, which confirms that the emulsion composition has a good solubilizing effect in shampoo. Combined with the results of Comparative Example 4, it can be seen that the composition without the addition of water-in-oil emulsifier (Comparative Example 6) has obvious stability defects after being added to shampoo, and the same layering phenomenon also occurred.

[0092] Test Example 2

[0093] Using the serums described in Application Example 1 and Comparative Examples 2-3 as test samples, their performance was tested. The specific test methods and results are shown below.

[0094] Seventy-five testers aged 20-50 were selected. Three scalp serums—Application Example 1 and Comparative Examples 2-3—were randomly distributed to the testers, with 25 testers per sample. Testers were instructed to apply the scalp serum to semi-dry hair after shampooing. After four weeks of continuous use, the scalp serums were rated on various performance aspects. Evaluation criteria included: refreshing and non-greasy feel upon application; comfort after application; improvement in scalp tightness; oil control effect; moisturizing effect; scalp freshness retention; and overall satisfaction. A 7-point scale was used, with 7 being the best and 1 the worst; higher scores indicated better performance. The evaluation of the effects of each sample on various indicators is as follows: Figure 1 As shown.

[0095] Figure 1 The results showed that applying the composition prepared by the technical solution of the present invention to a scalp serum can effectively endow the scalp serum with better oil control and moisturizing properties.

[0096] Test Example 3

[0097] Using the shampoos described in Application Example 2 and Application Comparative Examples 5-6 as test samples, their performance was tested. The specific test methods and results are shown below.

[0098] Seventy-five test subjects aged 20-50 were selected. The three shampoos used in Application Example 2 and Comparative Examples 5-6 were randomly distributed to the test subjects, with 25 test subjects per sample. After four weeks of continuous use, the shampoos were rated on various performance aspects, including lather richness, smoothness after rinsing, manageability when dry, cleanliness when dry, scalp cleanliness, scalp cleanliness retention, and overall satisfaction. A 7-point scale was used, with 7 being the best and 1 the worst; higher scores indicated better performance. The evaluation of the effectiveness of each sample is as follows: Figure 2 As shown.

[0099] Depend on Figure 2 The results showed that the addition of this composition did not significantly affect the foaming properties of the shampoo. Combined with the conclusions of Comparative Example 5, it is clear that the formulation selection of cationic emulsifiers plays a crucial role in wash-off products like shampoos. Cationic emulsifiers can achieve demulsification and flocculation during rinsing and kneading, effectively increasing the retention rate of the composition on the scalp and hair surface, thereby enhancing oil control and continuously improving the scalp-cleansing experience. In contrast, emulsions prepared using nonionic emulsifiers, due to the lack of charge interaction, have a significantly reduced retention rate on the scalp surface, ultimately leading to a significant decrease in the product's oil control effect.

[0100] Finally, it should be noted that the above embodiments are used to illustrate the technical solutions of the present invention and not to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A scalp oil control composition comprising tea polyphenols, characterized in that, It includes the following components by weight percentage: 10-50% vegetable oil, 0.01-15% water-in-oil emulsifier, 0.01-15% oil-in-water emulsifier, 0.001-5% tea polyphenol modified nanoparticles, and the balance being water; The vegetable oil contains ≥70% oleic acid and ≤25% linoleic acid. The vegetable oil is at least one of olive fruit oil, camellia seed oil, and avocado oil; The water-in-oil emulsifier is oleamide propyl dimethylamine; The oil-in-water emulsifier is PEG-40 hydrogenated castor oil; The preparation method of the tea polyphenol modified nanoparticles includes the following steps: Hyaluronic acid was dissolved in water, and an ethanol solution containing salicylic acid was added. Then, 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide and N-hydroxysuccinimide were added and stirred to activate the mixture. Hydrolyzed keratin was then added and stirred to react. Tea polyphenols were then added, and the mixture was heated and stirred to react. Finally, ethanol was added, and the mixture was precipitated, centrifuged, washed, and dried to obtain tea polyphenol-modified nanoparticles. The hydrolyzed keratin has a molecular weight of 300-2000 Da.

2. The scalp oil control composition of claim 1, wherein The mass ratio of hyaluronic acid, salicylic acid, 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide, N-hydroxysuccinimide, hydrolyzed keratin, and tea polyphenols is 1:(0.2-0.3):(0.02-0.025):(0.021-0.027):(0.1-0.2):(0.4-0.6).

3. The method of preparing a scalp oil control composition according to claim 1 or 2, characterized in that, Includes the following steps: S1. Mix vegetable oil with water-in-oil emulsifier and heat to 50-80℃ to form phase A; S2. Mix the modified tea polyphenol nanoparticles with water to form phase B. Mix phase A and phase B and homogenize at a homogenization speed of 400-4000 rpm for 3-10 min to obtain the primary emulsion. S3. Homogenize the primary emulsion 1-5 times in a high-pressure microfluidic homogenizer at a homogenization pressure of 5-12 kbar to obtain a water-in-oil emulsion. S4. The obtained water-in-oil emulsion is mixed with an oil-in-water emulsifier and water, and homogenized at a homogenization speed of 200-1500 rpm for 3-10 minutes to obtain the scalp oil control composition.

4. The use of the scalp oil-control composition according to claim 1 or 2 in the preparation of shampoo and conditioner products.

5. The application according to claim 4, characterized in that, The hair care products include scalp serums, shampoos, conditioners, or hair sprays.

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