METHOD FOR EVALUATING GLOW OF SKIN, METHOD FOR EXAMINING SKIN GLOW IMPROVERS, AND SKIN GLOW IMPROVER

• US 20170336199A1
• Filed: 11/10/2015
• Published: 11/23/2017
• Est. Priority Date: 11/10/2014
• Status: Active Grant

• Current Assignee: Shiseido Company Limited
• Original Assignee: Shiseido Company Limited
• Inventors: MASUDA, Yuji, YAGI, Eiichiro, KUWAHARA, Tomohiro
• Granted Patent: US 10,281,267 B2
• Time in Patent Office: Days
• CPC Class Codes: A61B 5/00 Measuring for diagnostic purposes radiation diagnosis A61B6/00; diagnosis by ultrasonic, sonic or infrasonic waves A61B8/00; Identification of persons
• CPC Class Codes: A61B 5/0059 using light, e.g. diagnosis by transillumination, diascopy, fluorescence A61B5/0093, A61B5/1455, A61B5/02416 and A61B5/0261 take precedence
• CPC Class Codes: A61B 5/107 Measuring physical dimensions, e.g. size of the entire body or parts thereof
• CPC Class Codes: A61B 5/441 Skin evaluation, e.g. for skin disorder diagnosis
• CPC Class Codes: A61K 8/368 with carboxyl groups directly bound to carbon atoms of aromatic rings
• CPC Class Codes: A61K 8/44 Aminocarboxylic acids or derivatives thereof, e.g. aminocarboxylic acids containing sulfur; Salts; Esters or N-acylated derivatives thereof
• CPC Class Codes: A61Q 19/00 Preparations for care of the skin
• CPC Class Codes: G01B 11/30 for measuring roughness or irregularity of surfaces
• CPC Class Codes: G01N 21/21 Polarisation-affecting properties G01N21/19 takes precedence
• CPC Class Codes: G01N 21/57 Measuring gloss

Abstract

Provided are an evaluation method for objectively evaluating the glow of the skin, a skin glow improver, and a method for examining skin glow improvers. This method for evaluating the glow of the skin comprises assessing the specular reflectance and diffuse reflectance of skin after polarized light is applied to the surface of the skin, and determining that glow is present in the skin when prescribed conditions are satisfied. A skin glow improver is provided by combining an alkali metal salt of alkoxysalicylic acid and trimethylglycine. This method for examining skin glow improvers makes it possible, using a significant decrease in surface roughness as an indicator, to examine samples capable of improving the specular reflectance of the skin.

Claims

1. A skin glow improver, comprising an alkaline metal salt of alkoxysalicylic acid and trimethylglycine.

2. The skin glow improver according to claim 1, wherein the alkaline metal salt of alkoxysalicylic acid is potassium 4-methoxysalicylate.

3. The skin glow improver according to claim 2, comprising 0.5% to 3% of potassium 4-methoxysalicylate.

4. The skin glow improver according to claim 1, comprising 2% to 10% of trimethylglycine.

8. The skin glow improver according to claim 2, comprising 2% to 10% of trimethylglycine.

9. The skin glow improver according to claim 3, comprising 2% to 10% of trimethylglycine.

5. A method for screening a skin glow improver, comprising:

measuring surface roughness of horny layer cells,

applying a test sample to the horny layer cells, and

measuring surface roughness of the horny layer cells to which the sample has been applied,

wherein the test sample is determined to be able to enhance specular reflectance of skin in the case surface roughness of the horny layer cells to which the sample has been applied decreases significantly in comparison with surface roughness of the horny layer cells to which the test sample has not been applied.

6. A method for evaluating the glow of skin, comprising:

measuring a first reflectance by irradiating polarized light to the surface of skin followed by receiving reflected light polarized in a direction parallel to the direction of polarization of the irradiated polarized light,

measuring a second reflectance by irradiating the polarized light to the surface of the skin followed by receiving reflected light in a direction perpendicular to the direction of polarization of the irradiated polarized light, and

determining diffuse reflectance and specular reflectance from the first reflectance and the second reflectance;

wherein, the skin is determined to have glow in the case the diffuse reflectance and the specular reflectance satisfy prescribed conditions.

7. The method for evaluating skin glow according to claim 6, further comprising applying a test sample to skin before measuring the first reflectance and the second reflectance.