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KR-102962882-B1 - Cosmetic composition comprising nanocellulose and vitamin C

KR102962882B1KR 102962882 B1KR102962882 B1KR 102962882B1KR-102962882-B1

Abstract

A cosmetic composition according to one aspect contains a high amount of vitamin C by including nanocellulose, and the cosmetic composition has excellent stability of vitamin C over time.

Inventors

  • 한상우
  • 박찬호
  • 김호열
  • 박현정
  • 지진구
  • 박천호

Assignees

  • 코스맥스 주식회사

Dates

Publication Date
20260511
Application Date
20250408

Claims (9)

  1. A cosmetic composition comprising 0.001 to 2 weight% of nanocellulose having a diameter of 10 to 100 nm and 0.0001 to 20 weight% of vitamin C, wherein the vitamin C is stably captured within the three-dimensional structure of the nanocellulose and has excellent stability over time.
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  5. A cosmetic composition according to claim 1, wherein the cosmetic composition further comprises an emulsifier.
  6. A cosmetic composition according to claim 5, wherein the emulsifier comprises a polyglyceryl-based surfactant, a glyceryl-based surfactant, or a combination thereof.
  7. A step of obtaining nanocellulose with a diameter of 10 to 100 nm by stirring cellulose in an aqueous phase; and A method for preparing a cosmetic composition comprising the step of mixing 0.001 to 2 weight% of the above nanocellulose with 0.0001 to 20 weight% of vitamin C, A method for preparing a cosmetic composition in which the above-mentioned vitamin C is stably captured within the three-dimensional structure of the above-mentioned nanocellulose and has excellent stability over time.
  8. A method for preparing a cosmetic composition according to claim 7, wherein the stirring step is performed under conditions of 3,000 to 10,000 rpm.
  9. A method for preparing a cosmetic composition according to claim 7, wherein the stirring step is performed for 5 to 60 minutes.

Description

Cosmetic composition comprising nanocellulose and vitamin C This relates to a cosmetic composition comprising nanocellulose and vitamin C. Vitamin C (ascorbic acid) is a powerful antioxidant widely utilized in the cosmetics industry due to its various skin-improving benefits, such as skin whitening, wrinkle reduction, and the promotion of collagen synthesis. However, Vitamin C is unstable and easily oxidizes due to air, light, heat, and moisture. This leads to issues such as reduced efficacy and discoloration during long-term storage. Due to this vulnerability to oxidative instability, various technologies have been researched to effectively deliver Vitamin C to the skin while maintaining its stability. To address this, technologies have been proposed such as encapsulating vitamin C in the form of fine nanoparticle capsules or developing more stable vitamin C derivatives (e.g., ascorbyl palmitate, magnesium ascorbyl phosphate, etc.). However, these technologies have limitations, such as failing to sufficiently increase the skin absorption rate of vitamin C or still lacking in terms of long-term stability. Therefore, there is a need for the development of a cosmetic composition that contains a high amount of vitamin C, has excellent oxidative stability, and has an excellent skin absorption rate of vitamin C. Figure 1 is a graph showing the results of the potency test analysis of the cosmetic compositions of Examples 1 to 7 and Comparative Example 1 after storage in a 45°C constant temperature bath for one month. Figure 2 is an image of the appearance of the cosmetic compositions of Example 4, Comparative Examples 1 and 2 over time after being stored in a 45°C constant temperature bath. FIG. 3 is a 400x optical microscope image comparing the cosmetic compositions of Example 4 (left) and Comparative Example 3 (right) according to one embodiment and comparative example of the present invention. Figure 4 is a figure confirming, through an 8-hour moisturization duration test, that the cosmetic composition of Example 4 according to one embodiment of the present invention has superior moisturizing power compared to Comparative Example 1. Figure 5 is a figure confirming, through a 4-week brightness improvement test, that the cosmetic composition of Example 4 according to one embodiment of the present invention has superior brightness improvement power compared to Comparative Example 1. Figure 6 is a figure confirming, through a 4-week blemish improvement test, that the cosmetic composition of Example 4 according to one embodiment of the present invention has superior blemish improvement ability compared to Comparative Example 1. The following examples will be explained in more detail. However, these examples are intended to illustrate one or more specific examples, and the scope of the present invention is not limited to these examples. Preparation Example 1: Preparation of Nanocellulose (Pretreatment of Cellulose) To prepare nanocellulose of different diameters, two types of cellulose were prepared, and then the cellulose was evenly dispersed by stirring in an aqueous solution at a strong stirring intensity of about 7,000 rpm for more than 15 minutes. Examples 1–7: Preparation of cosmetic compositions containing nanocellulose and vitamin C Using the evenly dispersed cellulose from Preparation Example 1 above, an emulsion cosmetic composition comprising an aqueous phase and an oil phase was prepared according to the composition and content (weight%) presented in Table 1 below. Specifically, the aqueous phase was weighed, heated to 70°C, and evenly dispersed using a homo-mixer for 30 minutes. Subsequently, the oil phase, which had been heated to 90°C and evenly dissolved, was added to the aqueous phase and emulsified using a homo-mixer at 7,000 rpm for 5 minutes. After emulsification, when the temperature of the emulsion solution was 45°C, water correction and a preservative were added, and the mixture was emulsified at 7,000 rpm for 1 minute to prepare the cosmetic compositions of Examples 1 to 7. Comparative Examples 1–3: Preparation of cosmetic compositions containing nanocellulose and vitamin C Using the evenly dispersed cellulose from Preparation Example 1 above, an emulsion cosmetic composition comprising an aqueous phase and an oil phase was prepared according to the composition and content (weight%) presented in Table 1 below. Specifically, the aqueous phase was weighed, heated to 70°C, and evenly dispersed using a homo-mixer for 30 minutes. Subsequently, the oil phase, which had been heated to 90°C and evenly dissolved, was added to the aqueous phase and emulsified using a homo-mixer at 7,000 rpm for 5 minutes. After emulsification, when the temperature of the emulsion solution was 45°C, water correction and a preservative were added, and the mixture was emulsified at 7,000 rpm for 1 minute to prepare the cosmetic compositions of Comparative Examples 1 to 3. Experimental Example 1: Confirmation of Vitamin C