Granted Patent B2

US 12,589,154 · App. 17/618,358 · Granted Mar 31, 2026

Inventors: Michiaki Araki (Kashiwara, JP); Yoshihiko Hirata (Kashiwara, JP)

Assignee: SARAYA CO., LTD.

A61K47/46A23L33/14A61K8/9728A61Q19/00C11D1/36A23V2002/00

Abstract

Claims (20)

1 . A hydrolysate of a composition containing lactonic sophorolipid and acidic sophorolipid, the acidic sophorolipid being present in a proportion of 78 mass % or more, based on the total amount of the lactonic sophorolipid and the acidic sophorolipid taken as 100 mass %,

wherein a filtrate of the hydrolysate has the following features (1), (2), (4), (5), and (6):

(1) a hue value of 5 or less,

(2) an ethanol-insoluble content of less than 3 mass %,

(4) a pH of 6 to 9,

(5) a saponification value of 1 to 25 mgKOH/g, and

(6) an ignition residue content of 1.3 to 16 mass %,

wherein the filtrate of the hydrolysate is a filtrate obtained by adjusting the hydrolysate of the composition containing lactonic sophorolipid and acidic sophorolipid to room temperature 25±5° C. and then filtering the adjusted hydrolysate through a filter with a pore size of 0.45 μm, and

wherein the hue value is a value obtained by dissolving the filtrate in distilled water to achieve an ethanol-soluble content of 3 mass %, filtering the diluted aqueous solution through a filter with a pore size of 0.45 μm, measuring the absorbance of the obtained filtrate at a wavelength of 440 nm using an infrared/UV-visible spectrophotometer, and multiplying the absorbance by 10;

with the proviso that the hydrolysate excludes an acidic sophorolipid-composition obtained by hydrolyzing the composition containing lactonic sophorolipid and acidic sophorolipid and then purifying the resulting hydrolysate by column chromatography.

2 . The hydrolysate according to claim 1 , wherein the filtrate of the hydrolysate further has the following feature (3):

(3) a hue value after being allowed to stand at 50° C. in the dark for 1 month of 10 or less.

3 . A method for producing the hydrolysate of claim 1 , the method comprising the following steps (a) and (b):

(a) hydrolyzing a composition containing lactonic sophorolipid and acidic sophorolipid under conditions of 80° C. or less using an alkaline agent in an amount of 0.8 to 1.5 g eq. relative to the saponification value of the composition and

(b) adjusting the pH of the hydrolyzed composition of step (a) to a pH of 6 to 9 to obtain the hydrolysate.

4 . An anionic surfactant comprising the hydrolysate of claim 1 or a processed product thereof as an active ingredient.

5 . A perfumery or cosmetic, a food or drink, a detergent, a quasi-drug, a pharmaceutical, or an additive therefor, comprising the hydrolysate of claim 1 , or a processed product thereof.

6 . A method for producing the perfumery or cosmetic, the food or drink, the detergent, the quasi-drug, or the pharmaceutical of claim 5 , the method comprising the steps of mixing a third component for use in the manufacture of perfumery and cosmetics, foods and drinks, detergents, quasi-drugs, or pharmaceuticals into the hydrolysate or a processed product thereof; and forming the resulting mixture into a product.

7 . The production method according to claim 3 , wherein the filtrate of the hydrolysate further has the following feature (3):

(3) a hue value after being allowed to stand at 50° C. in the dark for 1 month of 10 or less.

Assignments (1)

Priority Claims (1)

Continuity (1)

References Cited (113)