Granted Patent B2

US 12,195,436 · App. 17/262,207 · Granted Jan 14, 2025

Inventors: Motohiro Arifuku (Tokyo, JP); Yoshiaki Kurihara (Tokyo, JP); Masato Kaneeda (Tokyo, JP)

Assignee: RESONAC CORPORATION

C07D311/40

Abstract

Claims (19)

1. A method for decomposing flavonoid glycosides, comprising

performing a heat treatment on a raw material containing flavonoid glycosides in a sealed container in the presence of an alcohol at a temperature exceeding a boiling point of the alcohol at atmospheric pressure to decompose the flavonoid glycosides into flavonoids, wherein the heat treatment is performed in the temperature range of 180 to 300° C. for 0.5 to 10 hours, and the flavonoid glycosides include sudachitin glycoside and/or demethoxysudachitin glycoside.

2. The method for decomposing flavonoid glycosides according to claim 1 , wherein the heat treatment is performed by heating a reaction solution containing the raw material and the alcohol in the sealed container,

wherein the content of the flavonoid glycosides in the reaction solution with respect to a total amount of the reaction solution is 0.01 to 3 mass %.

3. The method for decomposing flavonoid glycosides according to claim 1 , wherein the heat treatment is performed by heating a reaction solution containing the raw material and the alcohol in the sealed container,

wherein the content of an inorganic acid in the reaction solution with respect to a total amount of the reaction solution is 1 mass % or less.

4. The method for decomposing flavonoid glycosides according to claim 1 ,

wherein the heat treatment is performed in the presence of a solvent containing the alcohol and water.

5. The method for decomposing flavonoid glycosides according to claim 4 ,

wherein the content of the alcohol in the solvent with respect to a total amount of the solvent is 90 mass % or more.

6. The method for decomposing flavonoid glycosides according to claim 4 ,

wherein the content of water in the solvent with respect to a total amount of the solvent is 10 mass % or less.

7. The method for decomposing flavonoid glycosides according to claim 1 ,

wherein the raw material further contains flavonoids.

8. The method for decomposing flavonoid glycosides according to claim 1 ,

wherein the raw material is a dry powder obtained from citrus fruits or a pericarp of citrus fruits.

9. A method for producing flavonoids, comprising:

a decomposition process in which the flavonoid glycosides are decomposed by the method for decomposing flavonoid glycosides according to claim 1 ; and

an extraction process in which flavonoids are extracted from a decomposition product obtained in the decomposition process.

Assignments (3)

Continuity (1)

References Cited (12)