Method for decomposing flavonoid glycoside and method for producing flavonoid
Provided is a method for decomposing a flavonoid glycoside, wherein a flavonoid glycoside-containing raw material is hydrothermally treated to decompose a flavonoid glycoside into a flavonoid.
1. A method for decomposing flavonoid glycosides, comprising
performing a hydrothermal treatment on a raw material containing flavonoid glycosides to decompose the flavonoid glycosides into flavonoids,
wherein the flavonoid glycosides include sudachitin glycoside wherein the raw material is Citrus sudachi , and/or demethoxysudachitin glycoside, and
the hydrothermal treatment is performed under conditions of a temperature of 180° C. to 300° C. for 0.5 to 20 hours.
2. The method for decomposing flavonoid glycosides according to claim 1 ,
wherein the hydrothermal treatment is performed in a sealed container containing the raw material.
3. The method for decomposing flavonoid glycosides according to claim 2 ,
wherein the hydrothermal treatment is performed by heating a reaction solution containing the raw material and water in the sealed container.
4. The method for decomposing flavonoid glycosides according to claim 3 ,
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 %.
5. The method for decomposing flavonoid glycosides according to claim 3 ,
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.
6. The method for decomposing flavonoid glycosides according to claim 2 ,
wherein the hydrothermal treatment is performed by supplying water vapor into the sealed container from the outside.
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 the pericarp of Citrus sudachi.
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.
10. The method for decomposing flavonoid glycosides according to claim 1 , wherein the hydrothermal treatment is performed under conditions of a temperature of 190° C. to 300° C. for 0.5 to 20 hours.