Silicon oil-free anti-itch moisturizing children shampoo and preparation method thereof

Abstract

This invention provides a silicone-free anti-itch and moisturizing children's shampoo and its preparation method, belonging to the field of daily necessities preparation technology. This silicone-free anti-itch and moisturizing children's shampoo comprises the following raw materials by weight percentage: 0.1%-0.2% sword bean seed extract, 0.2%-0.5% nightshade root extract, 3%-20% surfactant, 1%-1.5% glycerin, 0.15%-0.5% panthenol, 0.5%-1.0% preservative, 0.05%-0.2% thickener, 0.05%-0.1% pH adjuster, and the balance being deionized water. This invention uses only two natural plant active ingredients, sword bean seed extract and nightshade root extract, as the sole efficacy system, working synergistically to achieve both soothing and moisturizing effects as well as anti-itch properties. It avoids the irritation risks associated with complex extract formulations. The ingredients have clear sources and defined functions. No silicone oil or its derivatives are added throughout the process, preventing hair follicle blockage, maintaining scalp permeability, reducing scalp problems at their source, and ensuring high safety, making it suitable for children's scalps.

Description

Technical Field

[0001] This invention relates to the field of daily necessities technology, and in particular to a silicone-free anti-itch and moisturizing children's shampoo and its preparation method. Background Technology

[0002] Hair is primarily composed of keratin, and the outer layer of hair strands is composed of scaly cuticles, or hair scales. During shampooing, the cuticles open and lift under the action of water and anionic surfactants, causing hair to become tangled and difficult to comb. Silicone oil can adhere to the hair strands, filling in the lifted and damaged cuticles, reducing tangling and friction between hair strands, and forming a protective film on the hair surface to reduce moisture loss and excessive moisture absorption, thus achieving a smooth, shiny, and flowing effect. However, because silicone oil is a synthetic, water-insoluble, and chemically stable oil, long-term use can cause silicone compounds to accumulate in layers on the scalp and hair, leading to clogged scalp pores, atrophied hair follicles, and thus affecting scalp and hair health, even causing hair loss.

[0003] Children's scalps are delicate, with less sebum secretion, making them more sensitive and easily irritated. Therefore, the market demand for gentle, safe, silicone-free children's shampoos with specific functions is increasing. Traditional children's shampoos typically rely on moisturizing, soothing, and dandruff-reducing ingredients to achieve some anti-itch and moisturizing functions, but these pose potential irritants and are not suitable for long-term use by children. In recent years, plant extracts have gradually become a research hotspot in children's hair care products due to their natural and gentle properties. However, most existing products still use a combination of multiple plant extracts, resulting in complex compositions that not only increase the risk of irritation but also make it difficult to clarify the specific effects and synergistic mechanisms of each ingredient. Furthermore, the extraction processes and application effects of extracts are often less than ideal, failing to fully utilize their natural efficacy and making it difficult to meet the production requirements of high-quality children's shampoos.

[0004] Therefore, developing a silicone-free children's shampoo with simple and clearly defined ingredients, high activity, and truly gentle and non-irritating properties has significant market value and practical significance. Summary of the Invention

[0005] Therefore, this invention proposes a silicone-free anti-itch and moisturizing children's shampoo and its preparation method.

[0006] The technical solution of this invention is implemented as follows: A silicone-free anti-itch and moisturizing children's shampoo, wherein the active ingredients of the shampoo are composed of sword bean seed extract and nightshade root extract; the mass ratio of the sword bean seed extract and nightshade root extract is 1-2:2-5; and the total mass of the active ingredients accounts for 0.3%-0.7% of the total mass of the shampoo.

[0007] Furthermore, the shampoo comprises the following ingredients by weight percentage: 0.1%-0.2% sword bean seed extract, 0.2%-0.5% nightshade root extract, 3%-20% surfactant, 1%-1.5% glycerin, 0.15%-0.5% panthenol, 0.5%-1.0% preservative, 0.05%-0.2% thickener, 0.05%-0.1% pH adjuster, and the balance being deionized water.

[0008] Furthermore, the preparation method of the sword bean seed extract includes: S1. The sword bean seeds are crushed and activated by low-temperature plasma, and then subjected to vacuum-ultrasonic treatment to obtain pretreated sword bean seeds. S2. Mix the pretreated sword bean seeds with an ethanol solution, add the complex enzyme-fermentation agent complex, extract using dynamic pressure swing extraction, centrifuge, collect the supernatant, filter through an ultrafiltration membrane, concentrate and dry the filtrate to obtain sword bean seed extract.

[0009] Furthermore, in step S1, the low-temperature plasma activation is performed at 20-30 kHz and 100-120 W for 10-20 seconds. The vacuum-ultrasonic treatment was performed for 8-10 minutes at -0.08 MPa, 20-30 kHz, and 80-90 W.

[0010] Furthermore, in step S2, the ratio of the pretreated sword bean seeds to the ethanol solution is 1:6-10 g / mL; the concentration of the ethanol solution is 40-50% v / v. The amount of the compound enzyme-fermentation agent complex added is 6%-8% of the weight of the pretreated sword bean seeds; The complex enzyme-fermentation agent complex is obtained by encapsulating cellulase and xylanase in a mass ratio of 1:0.2-0.5 and Lactobacillus plantarum and Bacillus pumilus in a mass ratio of 1:1-2 in sodium alginate-chitosan. The complex enzyme accounts for 10%-15% of the mass of the complex enzyme and 8%-12% of the mass of the fermentation agent.

[0011] Furthermore, in step S2, the dynamic pressure extraction specifically involves: first extracting at normal pressure for 1-2 hours at 28-30℃, then pressurizing to 0.20-0.30MPa and extracting at 35-38℃ for 2-4 hours, and finally depressurizing to normal pressure and extracting at 32-34℃ for 1-2 hours. The ultrafiltration process involves passing the ultrafiltration membrane with a molecular weight cutoff of 1000-3000 Da.

[0012] Furthermore, the preparation method of the eggplant root extract includes: crushing the eggplant root, adding water, adding a compound enzyme for extraction, filtering, concentrating under a vacuum of 0.09 MPa and 80°C until a clear extract of 1.05-1.10 g / mL is obtained, adding ethanol to the clear extract, centrifuging at 5000-6000 rpm to separate and collect the precipitate, and obtaining the eggplant root extract.

[0013] Furthermore, the ratio of the eggplant root to water is 1:10-15 g / mL; the compound enzyme consists of cellulase and pectinase in a mass ratio of 2-3:1, and the amount of the compound enzyme added is 1%-3% of the mass of the eggplant root; the extraction is carried out at 40-45℃ and pH 4.0-6.0 for 2-4 hours; and the volume ratio of ethanol to extract is 3-5:1.

[0014] Furthermore, the surfactant is at least three of the following: anionic surfactant, amphoteric surfactant, amino acid anionic surfactant, and nonionic surfactant.

[0015] The anionic surfactant is sodium lauryl ether sulfate or sodium C14-16 olefin sulfonate; The amphoteric surfactant is selected from one or more of cocamidopropyl hydroxysulfonate betaine, cocamidopropyl betaine, and disodium cocoamphodiacetate; The amino acid anionic surfactant is selected from one or more of sodium lauroyl sarcosinate, sodium cocoyl methyl taurate taurate, potassium cocoyl hydrolyzed oat protein, and sodium lauroyl glutamate. The nonionic surfactant is decyl glucoside.

[0016] A method for preparing a silicone-free, anti-itch, and moisturizing children's shampoo, comprising the following specific steps: Heat the prescribed amounts of deionized water, glycerin, and panthenol to 80-85℃, keep warm for 30-35 minutes, then cool to 70℃. Add the surfactant and stir at 2000-3000 rpm for 20-30 minutes. Cool to 50℃, add the sword bean seed extract and nightshade root extract, and stir at 500-800 rpm for 30-40 minutes. Cool to 40℃, add the preservative, and stir until homogeneous. Adjust the pH of the system to 5.5-6.5 using a pH adjuster. Finally, add the thickener at 35-40℃ and stir until homogeneous to obtain the target shampoo.

[0017] Compared with the prior art, the beneficial effects of the present invention are: This invention uses only two natural plant active ingredients, sword bean seed extract and nightshade root extract, as the sole efficacy system. They work synergistically to achieve both soothing and moisturizing effects as well as relieving itching. This avoids the irritation risks associated with complex extract blends. The ingredients have clear sources and well-defined functions. No silicone oil or its derivatives are added throughout the process, preventing hair follicle blockage, maintaining scalp permeability, and reducing scalp problems at their source. It is highly safe and suitable for children's scalps.

[0018] This invention employs low-temperature plasma activation and vacuum-ultrasonic pretreatment to treat sword bean seeds, increasing their activity and permeability. Combined with the synergistic dynamic pressure swing extraction of compound enzymes and fermentation agents, it significantly improves the extraction rate and purity of active ingredients, while avoiding the damage to the components caused by high temperatures and chemical solvents. Detailed Implementation

[0019] To better understand the technical content of this invention, specific embodiments are provided below to further illustrate the invention.

[0020] Unless otherwise specified, the experimental methods used in the embodiments of this invention are all conventional methods.

[0021] Unless otherwise specified, all materials and reagents used in the embodiments of this invention are commercially available.

[0022] The preservative used in this invention is phenoxyethanol, the thickener is cocamide methyl MEA, and the pH adjuster is citric acid.

[0023] The anionic surfactant of this invention is sodium lauryl ether sulfate or sodium C14-16 olefin sulfonate.

[0024] The amphoteric surfactant of the present invention is selected from one or more of cocamidopropyl hydroxysulfonate, cocamidopropyl betaine, and disodium cocamidopropyl diacetate.

[0025] The amino acid anionic surfactant of the present invention is selected from one or more of sodium lauroyl sarcosinate, sodium cocoyl methyl taurate taurate, potassium cocoyl hydrolyzed oat protein, and sodium lauroyl glutamate.

[0026] The nonionic surfactant of this invention is decyl glucoside.

[0027] Preparation Example The preparation methods of sword bean seed extract include: S1. Crush the sword bean seeds and treat them with low-temperature plasma at 25kHz and 110W for 15s, then treat them with -0.08MPa, 25kHz and 85W for 10min to obtain pretreated sword bean seeds. S2. At a ratio of 1:10 g / mL, pretreated sword bean seeds were mixed with 50% v / v ethanol solution, and 8% compound enzyme-fermentation agent complex was added. The mixture was first extracted at 30℃ under normal pressure for 2 hours, then pressurized to 0.30 MPa and extracted at 38℃ for 3 hours. Finally, the pressure was released to normal pressure and extracted at 34℃ for 1 hour. The mixture was centrifuged at 1000 rpm, and the supernatant was collected and filtered through an ultrafiltration membrane with a molecular weight cutoff of 3000 Da. The filtrate was concentrated and dried to obtain sword bean seed extract.

[0028] The above-mentioned complex enzyme-fermentation agent complex is obtained by encapsulating cellulase and xylanase in a mass ratio of 1:0.2 and Lactobacillus plantarum and Bacillus pumilus in a mass ratio of 1:2 in sodium alginate-chitosan. The complex enzyme accounts for 15% of the mass of the complex enzyme and 8% of the mass of the fermentation agent.

[0029] The preparation method of Solanum nigrum root extract includes: crushing Solanum nigrum roots, adding water at a ratio of 1:15 g / mL, adding 2% compound enzyme (cellulase and pectinase in a mass ratio of 2:1), extracting at 40℃ and pH 5.0 for 3 hours, filtering, concentrating to a clear extract at a vacuum of 0.09 MPa and a temperature of 80℃ to 1.10 g / mL, adding ethanol to the clear extract at a volume ratio of 4:1, centrifuging at 5500 rpm to separate and collect the precipitate, and obtaining Solanum nigrum root extract.

[0030] Examples 1-3 formula:

[0031] Preparation method: Heat the prescribed amounts of deionized water, glycerin, and panthenol to 85°C, keep warm for 30 minutes, then cool to 70°C. Add the surfactant, stir at 2000 rpm for 30 minutes, and cool to 50°C. Add the sword bean seed extract and nightshade root extract, stir at 800 rpm for 40 minutes, and cool to 40°C. Add the preservative, stir well, and adjust the pH of the system to 5.5-6.5 using a pH adjuster. Finally, add the thickener at 35°C and stir well to obtain a silicone-free anti-itch and moisturizing children's shampoo.

[0032] Comparative Examples 1-2 formula:

[0033] The preparation method is the same as in the examples.

[0034] Comparative Example 3 The difference from Example 1 is that the preparation method of the sword bean seed extract is different, but otherwise it is the same as Example 1.

[0035] Preparation method of sword bean seed extract: The sword bean seeds were crushed and mixed with 50% v / v ethanol solution at a ratio of 1:10 g / mL. 8% compound enzyme-fermentation agent complex was added, and the mixture was first extracted at 30℃ under normal pressure for 2 hours. The pressure was then increased to 0.30 MPa and extracted at 38℃ for 3 hours. Finally, the pressure was released to normal pressure and extracted at 34℃ for 1 hour. The mixture was centrifuged at 1000 rpm, and the supernatant was collected and filtered through an ultrafiltration membrane with a molecular weight cutoff of 3000 Da. The filtrate was concentrated and dried to obtain the sword bean seed extract.

[0036] The above-mentioned complex enzyme-fermentation agent complex is obtained by encapsulating cellulase and xylanase in a mass ratio of 1:0.2 and Lactobacillus plantarum and Bacillus pumilus in a mass ratio of 1:2 in sodium alginate-chitosan. The complex enzyme accounts for 15% of the mass of the complex enzyme and 8% of the mass of the fermentation agent.

[0037] Comparative Example 4 The difference from Example 1 is that the preparation method of the sword bean seed extract is different, but otherwise it is the same as Example 1.

[0038] Preparation method of sword bean seed extract: S1. Crush the sword bean seeds and treat them with low-temperature plasma at 25kHz and 110W for 15s, then treat them with -0.08MPa, 25kHz and 85W for 10min to obtain pretreated sword bean seeds. S2. Mix the pretreated sword bean seeds with a 50% v / v ethanol solution at a ratio of 1:10 g / mL, extract at 70℃ for 6 h, centrifuge at 1000 rpm, collect the supernatant, filter through an ultrafiltration membrane with a molecular weight cutoff of 3000 Da, concentrate and dry the filtrate to obtain sword bean seed extract.

[0039] Comparative Example 5 The difference from Example 1 is that the preparation method of the sword bean seed extract is different, but otherwise it is the same as Example 1.

[0040] Preparation method of sword bean seed extract: S1. Crush the sword bean seeds and treat them with low-temperature plasma at 25kHz and 110W for 15s, then treat them with -0.08MPa, 25kHz and 85W for 10min to obtain pretreated sword bean seeds. S2. At a ratio of 1:10 g / mL, pretreated sword bean seeds were mixed with 50% v / v ethanol solution, and 2% compound enzyme (cellulase and xylanase at a mass ratio of 1:0.2) was added. The mixture was first extracted at 30℃ under normal pressure for 2 hours, then pressurized to 0.30 MPa and extracted at 38℃ for 3 hours. Finally, the pressure was released to normal pressure and extracted at 34℃ for 1 hour. The mixture was centrifuged at 1000 rpm, and the supernatant was collected and filtered through an ultrafiltration membrane with a molecular weight cutoff of 3000 Da. The filtrate was concentrated and dried to obtain sword bean seed extract.

[0041] Comparative Example 6 The difference from Example 1 is that the preparation method of the sword bean seed extract is different, but otherwise it is the same as Example 1.

[0042] Preparation method of sword bean seed extract: S1. Crush the sword bean seeds and treat them with low-temperature plasma at 25kHz and 110W for 15s, then treat them with -0.08MPa, 25kHz and 85W for 10min to obtain pretreated sword bean seeds. S2. At a ratio of 1:10 g / mL, pretreated sword bean seeds were mixed with 50% v / v ethanol solution, and 8% compound enzyme-fermentation agent complex was added. The mixture was extracted at 38℃ for 4 hours, centrifuged at 1000 rpm, and the supernatant was collected. The supernatant was filtered through an ultrafiltration membrane with a molecular weight cutoff of 3000 Da. The filtrate was concentrated and dried to obtain sword bean seed extract.

[0043] The above-mentioned complex enzyme-fermentation agent complex is obtained by encapsulating cellulase and xylanase in a mass ratio of 1:0.2 and Lactobacillus plantarum and Bacillus pumilus in a mass ratio of 1:2 in sodium alginate-chitosan. The complex enzyme accounts for 15% of the mass of the complex enzyme and 8% of the mass of the fermentation agent.

[0044] Test Example 1 The moisturizing performance of Examples 1-3 and Comparative Examples 1-6 was tested using the Transdermal Water Loss (TEWL) test. The lower the transdermal water loss (TEWL) measurement value, the better the moisturizing performance. The results are shown in Table 1. Table 1

[0045] As can be seen from Table 1, compared with the comparative examples, the shampoos prepared in Examples 1-3 of the present invention have better moisturizing performance, indicating that the canavalia seed extract and nightshade root extract of the present invention work synergistically, and the specific extraction method of canavalia seed extract has a significant impact on the moisturizing properties of the product.

[0046] Test Example 2 The dandruff-reducing and antipruritic properties of the shampoos prepared in Examples 1-3 and Comparative Examples 1-6 were tested according to (Chen Yue, Zhang Hongqiang, Wang Jiahui, Zhang Jiamei, Cao Fumin. Study on dandruff-reducing and antipruritic properties of selenium disulfide shampoo [J]. China Detergent Industry, 2024(3):41). The evaluation was conducted in the manner described in 45), with 3 parallel studies in each group, and the average value was taken. The results are shown in Table 2.

[0047] Table 2

[0048] As can be seen from Table 2, the shampoos prepared in Examples 1-3 of the present invention have good dandruff removal and itch relief effects.

[0049] Test Example 3 Irritation tests were conducted on the silicone-free antipruritic and moisturizing children's shampoos prepared in Examples 1-3. 1. Acute eye irritation test Laboratory animals: Nine female New Zealand rabbits of common grade, weighing 2.0-2.5 kg, divided into three groups. Eye examination revealed no abnormalities. The laboratory animals were sourced from Shandong Aileke Biotechnology Co., Ltd.

[0050] Experimental Methods: In accordance with Chapter 6 (5) of the "Cosmetic Safety Technical Specifications" (2015 edition), New Zealand rabbits were acclimatized for 3 days in a laboratory animal room environment (temperature 16-26℃, relative humidity 40-70%). Within 24 hours before the start of the experiment, both eyes of the New Zealand rabbits were examined (including examination with sodium fluorescein). No obvious eye irritation, corneal defects, or conjunctival damage were observed. Exposure: The lower eyelid of one rabbit's eye was gently pulled open, and 100 mg of the test substance was instilled into the conjunctival sac. The upper and lower eyelids were passively closed for 1 second. At 30 seconds, the eyes were rinsed with a sufficient amount of water at a relatively fast flow rate that would not cause eye damage for 30 seconds. The other eye was left untreated as a self-control. After 24 hours of observation and recording, the eyes of all animals were further examined with sodium fluorescein.

[0051] Animal observation: Examine the animal's eyes at 1, 24, 48, and 72 hours after instillation of the test substance, and on days 4 and 7. The test can be terminated if no irritation occurs within 72 hours. If corneal involvement or other eye irritation is observed that does not resolve within 7 days, the observation period should be extended to determine the reversibility or irreversibility of the damage, generally not exceeding 21 days, and observation reports should be provided at 7, 14, and 21 days. In addition to observing the cornea, iris, and conjunctiva, all other damage effects should be recorded and reported. The score of the eye irritation response should be recorded according to the eye damage scoring criteria at each examination.

[0052] The results are shown in Table 3.

[0053] Table 3

[0054] As can be seen from Table 3, the silicone-free antipruritic and moisturizing children's shampoo prepared in Examples 1-3 of the present invention showed no acute eye irritation in rabbits under 30s rinsing conditions.

[0055] 2. Acute skin irritation test Experimental animals: 12 ordinary-grade New Zealand rabbits, female, non-pregnant, never given birth, weighing 2.0-2.5kg, with intact skin and no abnormalities upon examination. The experimental animals were obtained from Shandong Aileke Biotechnology Co., Ltd.

[0056] Experimental Methods: According to Chapter 6 (4) of the "Cosmetic Safety Technical Specifications" (2015 edition), New Zealand rabbits were acclimatized for 3 days in a laboratory animal room environment (temperature 16-26℃, relative humidity 40-70%). Animal Treatment: Approximately 24 hours before the experiment, the hair on both sides of the spine on the back of the experimental animal was trimmed, taking care not to damage the epidermis. The hair removal area was approximately 3cm × 3cm on both the left and right sides. Toxic Treatment: 0.5g of the test substance was applied directly to the hair removal area, then covered with two layers of medical gauze (2.5cm × 2.5cm) and a layer of cellophane, and then fixed with non-irritating medical tape and bandage. The other side of the skin served as a control. The occlusive dressing was applied for 2 hours. After the experiment, residual test substance was removed with warm water.

[0057] Animal observation: Skin reactions at the application site were observed at 1 h, 24 h, 48 h, and 72 h after removal of the test substance. Skin reactions were scored according to the skin irritation response scoring criteria, and the average score of the test animals was used for comprehensive evaluation. The skin irritation intensity was determined according to the average of the highest scores at each observation point of 24 h, 48 h, and 72 h, using a skin irritation intensity grading table. The observation period should be sufficient to observe the entire process of reversible or irreversible irritation, generally not exceeding 14 days.

[0058] The results are shown in Table 4.

[0059] Table 4

[0060] As can be seen from Table 4, the silicone-free antipruritic and moisturizing children's shampoo prepared in Examples 1-3 of the present invention has no acute skin irritation on rabbits.

[0061] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A silicone-free, anti-itch, moisturizing children's shampoo, characterized in that, The active ingredients of the shampoo consist of sword bean seed extract and nightshade root extract; the mass ratio of the sword bean seed extract to the nightshade root extract is 1-2:2-5; the total mass of the active ingredients accounts for 0.3%-0.7% of the total mass of the shampoo.

2. The silicone-free anti-itch and moisturizing children's shampoo as described in claim 1, characterized in that, The shampoo comprises the following ingredients by weight percentage: sword bean seed extract 0.1%-0.2%, nightshade root extract 0.2%-0.5%, surfactant 3%-20%, glycerin 1%-1.5%, panthenol 0.15%-0.5%, preservative 0.5%-1.0%, thickener 0.05%-0.2%, pH adjuster 0.05%-0.1%, and the balance being deionized water.

3. The silicone-free anti-itch and moisturizing children's shampoo as described in claim 2, characterized in that, The preparation method of the sword bean seed extract includes: S1. The sword bean seeds are crushed and activated by low-temperature plasma, and then subjected to vacuum-ultrasonic treatment to obtain pretreated sword bean seeds. S2. Mix the pretreated sword bean seeds with an ethanol solution, add the complex enzyme-fermentation agent complex, extract using dynamic pressure swing extraction, centrifuge, collect the supernatant, filter through an ultrafiltration membrane, concentrate and dry the filtrate to obtain sword bean seed extract.

4. The silicone-free anti-itch and moisturizing children's shampoo as described in claim 3, characterized in that, In step S1, the low-temperature plasma activation is performed at 20-30 kHz and 100-120 W for 10-20 seconds. The vacuum-ultrasonic treatment was performed for 8-10 minutes at -0.08 MPa, 20-30 kHz, and 80-90 W.

5. A silicone-free, anti-itch, and moisturizing children's shampoo as described in claim 3, characterized in that, In step S2, the ratio of the pretreated sword bean seeds to the ethanol solution is 1:6-10 g / mL; the concentration of the ethanol solution is 40-50% v / v. The amount of the compound enzyme-fermentation agent complex added is 6%-8% of the weight of the pretreated sword bean seeds; The complex enzyme-fermentation agent complex is obtained by encapsulating cellulase and xylanase in a mass ratio of 1:0.2-0.5 and Lactobacillus plantarum and Bacillus pumilus in a mass ratio of 1:1-2 in sodium alginate-chitosan. The complex enzyme accounts for 10%-15% of the mass of the complex enzyme and 8%-12% of the mass of the fermentation agent.

6. A silicone-free, anti-itch, and moisturizing children's shampoo as described in claim 3, characterized in that, In step S2, the dynamic pressure extraction is specifically performed as follows: first extract at normal pressure for 1-2 hours at 28-30℃, then pressurize to 0.20-0.30MPa and extract at 35-38℃ for 2-4 hours, and finally depressurize to normal pressure and extract at 32-34℃ for 1-2 hours. The ultrafiltration process involves passing the ultrafiltration membrane with a molecular weight cutoff of 1000-3000 Da.

7. A silicone-free, anti-itch, and moisturizing children's shampoo as described in claim 2, characterized in that, The preparation method of the Solanum nigrum root extract includes: crushing the Solanum nigrum root, adding water, adding a compound enzyme for extraction, filtering and concentrating to a clear extract of 1.05-1.10 g / mL, adding ethanol to the clear extract, centrifuging to separate and collect the precipitate to obtain the Solanum nigrum root extract.

8. The silicone-free anti-itch and moisturizing children's shampoo as described in claim 7, characterized in that, The ratio of the root of *Solanum nigrum* to water is 1:10-15 g / mL; the compound enzyme consists of cellulase and pectinase in a mass ratio of 2-3:1, and the amount of the compound enzyme added is 1%-3% of the mass of the root of *Solanum nigrum*; the extraction is carried out at 40-45℃ and pH 4.0-6.0 for 2-4 hours; the volume ratio of ethanol to extract is 3-5:

1.

9. A silicone-free, anti-itch, and moisturizing children's shampoo as described in claim 2, characterized in that, The surfactant is at least three of the following: anionic surfactant, amphoteric surfactant, amino acid anionic surfactant, and nonionic surfactant.

10. A method for preparing a silicone-free, anti-itch, and moisturizing children's shampoo according to any one of claims 1-9, characterized in that, The specific preparation steps include: heating the prescribed amounts of deionized water, glycerin, and panthenol to 80-85℃, keeping them warm for 30-35 minutes, then cooling to 70℃, adding a surfactant, stirring at 2000-3000 rpm for 20-30 minutes, cooling to 50℃, adding sword bean seed extract and nightshade root extract, stirring at 500-800 rpm for 30-40 minutes, cooling to 40℃, adding a preservative, stirring evenly, adjusting the pH of the system to 5.5-6.5 using a pH adjuster, and finally adding a thickener at 35-40℃ and stirring evenly to obtain the target shampoo.

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