Foot nourishing powder containing Chinese herbal medicine extract and preparation method thereof

Abstract

The invention belongs to the field of daily chemicals and fine chemical engineering, and relates to foot nourishing powder containing Chinese herbal medicine extracts and a preparation method of the foot nourishing powder. The foot nourishing powder is prepared from a modified Chinese herbal medicine extract, 2-hydroxyethyl-3-methoxypropanamide, talcum powder, zinc oxide, sodium bicarbonate, kieselguhr, menthol and essence. The modified Chinese herbal medicine extract is a fructus cnidii-radix sophorae flavescentis composite extract synergistically modified by lactic acid-chitosan-ionic liquid, covalent binding of hydroxyl and amino on the surface of the extract is achieved through an amidation-esterification reaction, and the stability and powder dispersity of the traditional Chinese medicine active components are remarkably improved. The preparation method of the foot nourishing powder comprises the following four steps: premixing the raw materials, compounding and mixing, adding and drying, and granulating and packaging. Through the innovative design of chemical modification of the ionic liquid and compounding of small organic molecules, structure fixation and function synergy of the Chinese herbal medicine extract are achieved, and obvious creativity and practical application value are achieved.

Description

Technical Field

[0001] This invention belongs to the field of daily chemical products and fine chemical technology, specifically relating to a foot care powder containing traditional Chinese medicine extracts and its preparation method. Background Technology

[0002] Most existing foot powder products use talcum powder, boric acid powder, zinc oxide, or sodium bicarbonate as base components, and add menthol, camphor, or fragrances to achieve temporary moisture absorption, deodorization, and cooling and anti-itch effects. However, these traditional formulas generally suffer from low activity of the herbal components, poor duration of efficacy, and easy clumping and moisture absorption. Especially when herbal extracts are introduced, these extracts typically contain many polar functional groups and unstable polyphenolic active ingredients, which are easily oxidized or decomposed in the air, leading to a decrease in antibacterial and deodorizing effects. Furthermore, the significant polarity difference between the herbal extracts and the powder matrix results in poor dispersibility and often leads to agglomeration, making the product overly hygroscopic, reducing storage stability, and even causing clumping or moisture absorption in humid environments.

[0003] Furthermore, the active ingredients in existing foot powder formulas are mostly in a physically mixed state, lacking long-lasting adhesion and sustained-release capabilities upon skin contact. Their effects are short-lived, making it difficult to form a stable protective layer on the skin surface, thus limiting their promotion of skin barrier repair and stratum corneum regeneration on the feet. Currently, there are no known technical solutions for improving the stability and synergistic properties of traditional Chinese medicine extracts through chemical structure design. In particular, there is a lack of reports on functionalizing traditional Chinese medicine extracts using ionic liquid systems to impart both hydrophobicity and reactivity; simultaneously, there are no technologies for combining simple small-molecule compounds with weakly polar hydrogen bond donor characteristics with traditional Chinese medicine extracts to achieve synergistic functions of "hygroscopic controlled release—skin repair—long-lasting deodorization."

[0004] Therefore, developing a composite foot powder system that can improve the dispersion stability of herbal extracts through chemical modification and synergistically combine with specific small organic molecules can not only significantly enhance the stability and release duration of active ingredients in traditional Chinese medicine, but also take into account skin repair and antibacterial and deodorizing properties, which has important practical application value and innovative significance. Summary of the Invention

[0005] To overcome the challenges of poor stability, severe moisture absorption and reflux, insufficient duration of efficacy, and lack of structural innovation in existing foot powders containing traditional Chinese medicine extracts, this invention aims to provide a foot powder containing traditional Chinese medicine extracts and its preparation method. This invention utilizes a lactic acid-chitosan-1-ethyl-3-methylimidazolium acetate ionic liquid system to synergistically modify the Cnidium monnieri-Sophora flavescens composite extract, causing an amidation-esterification reaction between the hydroxyl groups on the extract surface and the amino groups of chitosan, forming a stable covalent bond structure, significantly improving the hydrophobicity and powder dispersibility of the extract. Subsequently, a simple organic small molecule, 2-hydroxyethyl-3-methoxypropionamide, not previously used in this field, is introduced. Through hydrogen bonding, it synergistically constructs a composite network with the powder carrier, enabling the system to form a uniform action layer on the skin surface, achieving long-lasting sustained release of the active ingredients. The foot powder of this invention exhibits excellent antibacterial and deodorizing properties and good skin repair effects. The powder has high flowability, does not clump, does not reflux, and has long-lasting and stable efficacy.

[0006] The objective of this invention can be achieved through the following technical solutions: A foot care powder containing traditional Chinese medicine extracts, comprising the following raw materials in parts by weight: 10-30 parts modified traditional Chinese medicine extract; 5-20 parts 2-hydroxyethyl-3-methoxypropionamide; 30-50 parts talc; 3-8 parts zinc oxide; 3-10 parts sodium bicarbonate; 5-15 parts diatomaceous earth; 0.5-2 parts menthol; and 0.2-0.8 parts fragrance. The modified traditional Chinese medicine extract is a Cnidium monnieri-Sophora flavescens composite extract synergistically modified with lactic acid-chitosan ionic liquid. Covalent bonding of hydroxyl and amino groups on the extract surface is achieved through an amidation-esterification synergistic reaction in the ionic liquid system, thereby improving the hydrophobicity and powder compatibility of the active components of the traditional Chinese medicine. The 2-hydroxyethyl-3-methoxypropionamide forms weak hydrogen bonds and has a moisture-controlling effect in the system to obtain a stable composite powder system with antibacterial, deodorizing, and skin-repairing functions.

[0007] Optionally, the modified herbal extract includes the following raw materials in parts by weight: 10-20 parts of Cnidium monnieri extract; 10-20 parts of Sophora flavescens extract; 5-10 parts of chitosan; 3-8 parts of lactic acid; 2-6 parts of 1-ethyl-3-methylimidazolium acetate ionic liquid; 20-40 parts of ethanol; and 30-60 parts of deionized water.

[0008] Optionally, the preparation method of the modified herbal extract includes the following steps: (1) After crushing the raw materials of Cnidium monnieri and Sophora flavescens, add them to an ethanol aqueous solution for reflux extraction, filter to obtain the supernatant and concentrate under reduced pressure to obtain a mixed extract; (2) Add the mixed extract to an ionic liquid system composed of chitosan, lactic acid and 1-ethyl-3-methylimidazolium acetate, stir and react to allow the hydroxyl groups on the surface of the extract to undergo amidation-esterification with the amino groups of chitosan, forming a modified herbal extract. (3) After the reaction is complete, ethanol is added to the system for precipitation and separation. After standing, the precipitate is centrifuged, collected, vacuum dried, ground and sieved to obtain modified Chinese herbal medicine extract powder.

[0009] Optionally, the extraction reaction conditions in step (1) are a reflux temperature of 60-70°C and a time of 2-3 hours.

[0010] Optionally, the amidation-esterification reaction conditions in step (2) are a reaction temperature of 50-60°C and a reaction time of 3-5 hours.

[0011] Optionally, the drying conditions in step (3) are a vacuum of -0.08 MPa, a temperature of 40 to 50 °C, and a drying time of 6 to 8 hours.

[0012] Optionally, a method for preparing a foot powder containing traditional Chinese medicine extracts includes the following steps: S1. Weigh talc, zinc oxide, sodium bicarbonate and diatomaceous earth and add them to a mixer for thorough premixing to obtain a uniform powder matrix. S2, the modified Chinese herbal extract and 2-hydroxyethyl-3-methoxypropionamide are added to a uniform powder matrix and stirred to obtain a mixture, so that the modified extract is uniformly dispersed and adsorbed on the powder surface. S3, add menthol and flavoring to the mixture, continue to mix evenly and then vacuum dry to remove residual solvent and moisture; S4. Cool the dried mixture, grind and sieve it, collect the powder to obtain foot powder containing Chinese herbal extracts.

[0013] Optionally, the premixing time in step S1 is 10 to 15 minutes.

[0014] Optionally, the mixing time in step S2 is 20 to 30 minutes, and the stirring speed is 200 to 300 rpm.

[0015] Optionally, the vacuum drying temperature in step S3 is 40–50°C, and the drying time is 6–8 hours.

[0016] The beneficial effects of this invention are: This invention utilizes an amidation-esterification synergistic modification of *Cnidium monnieri* and *Sophora flavescens* extracts in a lactic acid-chitosan-ionic liquid system. This process creates a stable covalently bonded network of active components from the traditional Chinese medicine, significantly improving the hydrophobicity and powder compatibility of the extracts. Simultaneously, the invention introduces 2-hydroxyethyl-3-methoxypropionamide, a simple organic small molecule not previously used in this field. This molecule forms multi-point hydrogen bonds with the modified traditional Chinese medicine molecules within the system, creating a controllable weak interaction network. This endows the foot powder with excellent structural stability and sustained-release properties. This innovative design achieves a dual regulatory mechanism of chemical immobilization of the herbal extracts and synergistic controlled release of small molecules, providing a new structural design approach for powder-based skin care materials. Attached Figure Description

[0017] The invention will now be further described with reference to the accompanying drawings.

[0018] Figure 1 A comparison of the infrared spectra of traditional Chinese medicine extracts and modified traditional Chinese medicine extracts; Figure 2 A comparison chart of antibacterial performance test results for samples with different formulation ratios; Figure 3 A comparison chart showing the deodorization performance test results of samples with different formulation ratios. Detailed Implementation

[0019] The present invention will be further described below with reference to specific embodiments. However, the present invention is not limited to the following embodiments. Equivalent adjustments made without departing from the spirit and essence of the present invention should also be considered to fall within the protection scope of the present invention.

[0020] Example 1 The purpose of this embodiment is to verify the effect of higher content of modified Chinese herbal extract on the antibacterial and activity retention performance of foot powder when the upper limit of the component is taken.

[0021] S1. Mix 20 parts of Cnidium monnieri extract and 20 parts of Sophora flavescens extract, add to an ethanol aqueous solution (80% by volume), reflux for extraction, filter, and concentrate under reduced pressure to obtain a mixed extract. Add 10 parts of chitosan, 8 parts of lactic acid, and 6 parts of 1-ethyl-3-methylimidazolium acetate to the mixture, stir thoroughly, add ethanol to precipitate, centrifuge, vacuum dry, grind and sieve to obtain a modified traditional Chinese medicine extract powder;

[0022] S2, add 50 parts of talc, 8 parts of zinc oxide, 10 parts of sodium bicarbonate and 15 parts of diatomaceous earth to a mixer for premixing, add 30 parts of modified Chinese herbal extract and 20 parts of 2-hydroxyethyl-3-methoxypropionamide, and stir thoroughly until uniform. S3, add 2 parts menthol and 0.8 parts fragrance, mix evenly and vacuum dry, cool and grind after drying and pass through an 80-mesh sieve to obtain a foot care powder sample with excellent antibacterial properties.

[0023] Example 2 The purpose of this embodiment is to verify the overall performance stability of the product at the intermediate ratio and to examine the synergistic effect of the modified extract and the small molecule compound.

[0024] S1. Mix 15 parts of Cnidium monnieri extract and 15 parts of Sophora flavescens extract, add to an ethanol aqueous solution and reflux for extraction, filter and concentrate to obtain the extract. Add 7 parts of chitosan, 5 parts of lactic acid and 4 parts of 1-ethyl-3-methylimidazolium acetate to the system and stir to react. After the reaction, add ethanol to precipitate, centrifuge, vacuum dry and grind and sieve to obtain modified Chinese herbal medicine extract powder; Figure 1 It can be seen that the modified herbal extract sample showed significant changes in several key wavelength bands; the O–H and N–H stretching vibration peaks at 3400 cm⁻¹ were significantly enhanced and shifted to lower wavenumbers, indicating that stronger hydrogen bonding was formed in the system; a new C=O absorption peak appeared at 1730 cm⁻¹, indicating that lactic acid and chitosan underwent an esterification reaction; at the same time, the newly added N–H bending vibration and C–N stretching peaks at 1560 cm⁻¹ and 1200 cm⁻¹ proved the formation of amide bonds; the enhanced C–O or S=O peak at 1050 cm⁻¹ indicated that ionic liquids participated in the reaction and formed new covalent bond structures; comprehensive analysis shows that the modified herbal extract underwent a synergistic reaction of amidation and esterification, resulting in a more stable structure and tighter functional group binding, providing a structural basis for its dispersion and sustained-release performance in foot powder systems;

[0025] S2, take 40 parts of talc powder, 5 parts of zinc oxide, 6 parts of sodium bicarbonate and 10 parts of diatomaceous earth and mix them evenly, add 20 parts of modified Chinese herbal medicine extract and 12 parts of 2-hydroxyethyl-3-methoxypropionamide, and stir and mix evenly. S3, add 1 part menthol and 0.5 parts fragrance, mix and vacuum dry, cool, grind and sieve to obtain a foot powder sample with good deodorizing and skin repair properties.

[0026] Example 3 The purpose of this embodiment is to examine the product structure stability and the moldability and flowability under the extreme conditions of the formulation when the components are taken at the lower limit.

[0027] S1. Take 10 parts of Cnidium monnieri extract and 10 parts of Sophora flavescens extract, dissolve them in an ethanol aqueous solution and reflux extract, filter and concentrate to obtain the extract. Add 5 parts of chitosan, 3 parts of lactic acid and 2 parts of 1-ethyl-3-methylimidazolium acetate, stir and react, precipitate with ethanol, centrifuge, vacuum dry, grind and sieve to obtain modified Chinese herbal medicine extract powder;

[0028] S2, add 30 parts of talc, 3 parts of zinc oxide, 3 parts of sodium bicarbonate and 5 parts of diatomaceous earth to a mixer, premix and then add 10 parts of modified Chinese herbal extract and 5 parts of 2-hydroxyethyl-3-methoxypropionamide, mix evenly; S3, add 0.5 parts of menthol and 0.2 parts of fragrance, mix evenly and vacuum dry, then grind and sieve to obtain a foot powder sample with good flowability and mild odor.

[0029] Comparative Example 1 The purpose of this comparative example is to examine the differences in product performance between Example 2 and Example 3 under the condition of only physical compounding of chitosan and lactic acid without chemical modification by ionic liquid.

[0030] S1. Take 15 parts of Cnidium monnieri extract and 15 parts of Sophora flavescens extract, add them to an ethanol aqueous solution and reflux to extract, filter and concentrate to obtain the extract; prepare an aqueous solution with 7 parts of chitosan and 5 parts of lactic acid, mix it directly with the above extract and stir, then add ethanol to precipitate, centrifuge, vacuum dry and grind and sieve to obtain "physical compound type" Chinese herbal medicine extract powder. S2, take 40 parts of talc powder, 5 parts of zinc oxide, 6 parts of sodium bicarbonate, and 10 parts of diatomaceous earth and mix them evenly. Add 20 parts of "physical compound" herbal extract and 12 parts of 2-hydroxyethyl-3-methoxypropionamide and stir to mix evenly. S3, add 1 part menthol and 0.5 parts flavoring, mix and vacuum dry, cool, grind and sieve to obtain the comparison sample.

[0031] Comparative Example 2 The purpose of this comparative example is to examine the differences in product performance between Example 2 and Example 2 under the condition that only ionic liquid is used to complex with the extract and chitosan-lactic acid covalent modification is not introduced.

[0032] S1. Take 15 parts of Cnidium monnieri extract and 15 parts of Sophora flavescens extract, add them to an ethanol aqueous solution and reflux to extract, filter and concentrate to obtain the extract; add 4 parts of 1-ethyl-3-methylimidazolium acetate to it and stir to mix, without adding chitosan and lactic acid, then precipitate with ethanol, centrifuge, vacuum dry and grind and sieve to obtain "ionic liquid complex type" Chinese herbal medicine extract powder. S2, take 40 parts of talc powder, 5 parts of zinc oxide, 6 parts of sodium bicarbonate and 10 parts of diatomaceous earth and mix them evenly. Add 20 parts of "ionic liquid complexing type" Chinese herbal extract and 12 parts of 2-hydroxyethyl-3-methoxypropionamide and stir to mix evenly. S3, add 1 part menthol and 0.5 parts flavoring, mix and vacuum dry, cool, grind and sieve to obtain the comparison sample.

[0033] Comparative Example 3 The purpose of this comparative study is to examine the structural stability and overall performance without the addition of small organic molecules while maintaining synergistic modification, and to verify the synergistic contribution of small molecules.

[0034] S1. Mix 15 parts of Cnidium monnieri extract and 15 parts of Sophora flavescens extract, add to an ethanol aqueous solution and reflux for extraction, filter and concentrate to obtain the extract. Add 7 parts of chitosan, 5 parts of lactic acid and 4 parts of 1-ethyl-3-methylimidazolium acetate to the system and stir to react. After the reaction, add ethanol to precipitate, centrifuge, vacuum dry and grind and sieve to obtain modified Chinese herbal medicine extract powder;

[0035] S2, take 40 parts of talc powder, 5 parts of zinc oxide, 6 parts of sodium bicarbonate, and 10 parts of diatomaceous earth and mix them evenly. Add 20 parts of modified Chinese herbal extract, without adding 2-hydroxyethyl-3-methoxypropionamide, and stir and mix evenly. S3, add 1 part menthol and 0.5 parts flavoring, mix and vacuum dry, cool, grind and sieve to obtain the comparison sample.

[0036] Performance testing 1. Antibacterial performance test Staphylococcus aureus and Escherichia coli were selected as representative strains, and the antibacterial activity of the samples was evaluated using the quantitative plate count method. 0.5 g of each of the samples from Example 2 and Comparative Examples 1–3 were added to centrifuge tubes containing bacterial suspension and incubated in a constant-temperature shaker for 2 hours. Neutralization solution was then added and mixed thoroughly, followed by serial dilution and plating onto nutrient agar plates. The plates were incubated at 37°C for 24 hours, and the colony count was recorded. The degree of colony reduction in different samples was compared to calculate the inhibition rate and evaluate the synergistic effect between the modified system and the small organic molecules.

[0037] 2. Deodorization performance test The adsorption and removal capacity of the sample for ammonia and isovaleric acid vapors was investigated in a closed reaction apparatus. 1.0 g of the sample was placed in a permeable dish and then placed in a 2 L sealed container, along with standard concentrations of ammonia or isovaleric acid gas. Gas samples were taken at 10, 30, 60, and 120 minutes to determine the residual concentration. The removal rate of odor substances was calculated by comparing the initial concentration changes with those at different times. The contributions of synergistic modification and small organic molecules to the adsorption and complexation of odor molecules were analyzed by comparing the curve changes of the examples and comparative examples.

[0038] 3. Moisture absorption and clumping test The hygroscopicity and storage stability of the samples were tested under constant temperature and humidity conditions. 5.0 g of sample was weighed and placed in an environment of 25℃ and 75% relative humidity. Mass changes over different time periods were recorded to calculate the hygroscopic rate. After 24 hours, the degree of agglomeration was analyzed using a standard sieve, and the angle of repose was measured to characterize flowability. Low hygroscopicity, agglomeration rate, and angle of repose indicate excellent resistance to moisture absorption and re-moistening of the powder. This test was used to verify the role of synergistic modification and small organic molecules in improving powder dispersibility and environmental stability.

[0039] 4. Activity retention and sustained-release performance test Using flavonoids or matrine from traditional Chinese medicine extracts as marker components, the release behavior of active substances was evaluated using an artificial sweat simulation release method. 200 mg of sample was placed in a diffusion cell and maintained at a constant temperature of 32°C. Samples were taken periodically to detect the concentration of the active ingredient. Cumulative release curves were plotted, and the release rate and time distribution of the examples and comparative examples were compared to analyze the effects of synergistic structural modification and organic small molecule complexation on the sustained-release properties of the active ingredient. This test can determine the product's duration of action and release control capability.

[0040] Table 1. Results of antibacterial performance test

[0041] Table 2 Deodorization performance test results

[0042] Table 3 Results of moisture absorption, dampness reabsorption, and clumping tests

[0043] Table 4 Results of Activity Duration and Sustained-Release Performance

[0044] As can be seen from the test results in Tables 1 to 4, the foot care powder of the present invention exhibits significant advantages in all major performance aspects, with Example 2 showing the best overall performance.

[0045] As shown in Table 1, Example 2 exhibited antibacterial activity rates of 99.4% against Staphylococcus aureus and 99.1% against Escherichia coli, significantly higher than the comparative samples. The results indicate that the herbal extract synergistically modified with lactic acid, chitosan, and ionic liquids formed a stable functional group-binding structure. This structure, combined with small organic molecules, significantly enhanced antibacterial activity and prolonged the duration of action.

[0046] The deodorization performance data in Table 2 show that Example 2 achieved removal rates of 95.8% for ammonia and 94.6% for isovaleric acid, significantly better than other samples. This result indicates that the synergistically modified extract forms a porous adsorption interface in the powder, while the polar groups of the small organic molecules enhance the adsorption and complexation capacity for odor molecules, resulting in a stronger deodorization effect.

[0047] Table 3 shows the moisture absorption and clumping test results. Example 2 exhibits a 24-hour moisture absorption rate of 2.9%, a clumping rate of 1.5%, and an angle of repose of 31.8°, demonstrating overall superior performance compared to all comparative samples. These results indicate that synergistic modification significantly reduced the polarity of the extract, improved the hydrophobicity and dispersibility of the powder, and the hydrogen bond network formed by the small organic molecules effectively prevented moisture adsorption and particle adhesion, maintaining good dryness and flowability of the product during storage.

[0048] Table 4 shows the results of activity retention and sustained-release performance. Example 2 exhibits an 8-hour cumulative release rate of 55.6% and a 24-hour activity retention rate of 83.9%, indicating that the system possesses excellent sustained-release characteristics and activity retention capabilities. In contrast, the comparative samples released too quickly and had low activity retention rates, suggesting that the active components are prone to migration or inactivation after the lack of synergistic modification or small molecule interaction.

[0049] In summary, Example 2 demonstrated the best performance in terms of antibacterial properties, deodorization, moisture resistance, and activity retention, fully proving that the synergistic modification of lactic acid, chitosan, and ionic liquid, combined with the compound design of 2-hydroxyethyl-3-methoxypropionamide, can significantly improve the overall performance of the product, exhibiting obvious creativity and synergy.

Claims

1. A foot powder containing extracts of traditional Chinese medicine, characterized in that, The foot powder comprises the following raw materials in parts by weight: 10-30 parts modified traditional Chinese medicine extract; 5-20 parts 2-hydroxyethyl-3-methoxypropionamide; 30-50 parts talc; 3-8 parts zinc oxide; 3-10 parts sodium bicarbonate; 5-15 parts diatomaceous earth; 0.5-2 parts menthol; and 0.2-0.8 parts fragrance. The modified traditional Chinese medicine extract is a Cnidium monnieri-Sophora flavescens compound extract synergistically modified with lactic acid-chitosan ionic liquid. Covalent bonding of hydroxyl and amino groups on the extract surface is achieved through an amidation-esterification synergistic reaction in the ionic liquid system. The 2-hydroxyethyl-3-methoxypropionamide forms a weak hydrogen bond complex and has a moisture-controlling effect in the system.

2. The foot powder containing traditional Chinese medicine extract according to claim 1, characterized in that, The modified herbal extract comprises the following raw materials in parts by weight: 10-20 parts of Cnidium monnieri extract; 10-20 parts of Sophora flavescens extract; 5-10 parts of chitosan; 3-8 parts of lactic acid; 2-6 parts of 1-ethyl-3-methylimidazolium acetate ionic liquid; 20-40 parts of ethanol; and 30-60 parts of deionized water.

3. A foot powder containing traditional Chinese medicine extract according to any one of claims 1 or 2, characterized in that, The preparation method of the modified traditional Chinese medicine extract includes the following steps: (1) After crushing the raw materials of Cnidium monnieri and Sophora flavescens, add them to an ethanol aqueous solution for reflux extraction, filter to obtain the supernatant and concentrate under reduced pressure to obtain a mixed extract; (2) Add the mixed extract to an ionic liquid system composed of chitosan, lactic acid and 1-ethyl-3-methylimidazolium acetate, stir and react to form a modified Chinese herbal extract; (3) After the reaction is complete, ethanol is added to the system for precipitation and separation. After standing, the precipitate is centrifuged, collected, vacuum dried, ground and sieved to obtain modified Chinese herbal medicine extract powder.

4. The foot powder containing traditional Chinese medicine extract according to claim 3, characterized in that, The extraction reaction conditions in step (1) are a reflux temperature of 60-70°C and a time of 2-3 hours.

5. The foot powder containing traditional Chinese medicine extract according to claim 3, characterized in that, The amidation-esterification reaction conditions in step (2) are a reaction temperature of 50-60°C and a reaction time of 3-5 hours.

6. The foot powder containing traditional Chinese medicine extract according to claim 3, characterized in that, The drying conditions in step (3) are: vacuum degree -0.08MPa, temperature 40-50℃, and drying time 6-8 hours.

7. A method for preparing a foot powder containing traditional Chinese medicine extracts, wherein the foot powder contains traditional Chinese medicine extracts As described in any one of claims 1 to 6, characterized in that, Includes the following steps: S1. Weigh talc, zinc oxide, sodium bicarbonate and diatomaceous earth and add them to a mixer for thorough premixing to obtain a uniform powder matrix. S2, the modified Chinese herbal extract and 2-hydroxyethyl-3-methoxypropionamide are added to a uniform powder matrix and stirred to obtain a mixture, so that the modified extract is uniformly dispersed and adsorbed on the powder surface. S3, add menthol and flavoring to the mixture, continue to mix evenly and then vacuum dry to remove residual solvent and moisture; S4. Cool the dried mixture, grind and sieve it, collect the powder to obtain foot powder containing Chinese herbal extracts.

8. The method for preparing a foot powder containing traditional Chinese medicine extract according to claim 7, characterized in that, The premixing time in step S1 is 10 to 15 minutes.

9. The method for preparing a foot powder containing traditional Chinese medicine extract according to claim 7, characterized in that, The mixing time in step S2 is 20 to 30 minutes, and the stirring speed is 200 to 300 rpm.

10. A method for preparing a foot powder containing traditional Chinese medicine extract according to claim 7, characterized in that, The vacuum drying temperature in step S3 is 40-50°C, and the drying time is 6-8 hours.

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