Red colorant composition derived from iridoid compounds and method for producing same
OwnerKeiko Izumida, Koji Hamasaki +1inventors
InventorsKeiko Izumida, Koji Hamasaki, Takamasa Yokoyama
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Abstract
A method for producing a red colorant composition derived from iridoid compounds, including a step of performing red color development that involves reaction of iridoid aglycones having a carboxyl group at position 4 of an iridoid skeleton with amino group-containing compounds, said red color development being performed in a solution in which ascorbic acid, similar compounds thereof, or two or more compounds selected from the group consisting of said ascorbic acid and said similar compounds are contained at a molar ratio of 5 or more with respect to all iridoid compounds in the solution, whereby red colorant compounds having acid resistance are generated.
Claims20
A method for producing a red colorant composition derived from iridoid compounds, comprising the following step:
- (1) performing red color development that involves reaction of iridoid aglycones having a carboxyl group at position 4 of an iridoid skeleton with amino group-containing compounds,
- said red color development being performed in a solution in which ascorbic acid, similar compounds thereof, or two or more compounds selected from the group consisting of said ascorbic acid and said similar compounds are contained at a molar ratio of 5 or more with respect to all iridoid compounds in the solution,
- whereby red colorant compounds having acid resistance are generated.
A method for producing a red colorant composition derived from iridoid compounds, comprising the following step:
- (1′) performing red color development that involves reaction of aglycones of geniposide ester hydrolysate and/or aglycones of geniposidic acid having a carboxyl group at position 4 of an iridoid skeleton with amino group-containing compounds,
- said red color development being performed under an acidic condition in a solution in which ascorbic acid is contained at a molar ratio of more than approximately 6 with respect to all iridoid compounds in the solution,
- whereby red colorant compounds having acid resistance are generated,
- wherein, in step (1′), production of iridoid aglycones is carried out by hydrolysis of β-glycosidic bonds in iridoid glycosides prior to and/or concurrently with the red color development, and
- said red colorant composition derived from iridoid compounds comprises a gardenia red colorant composition.
A red colorant composition derived from iridoid compounds having a feature comprising:
- an Aλmax/A600 nm value of an aqueous solution is 4.9 or more, when the aqueous solution contains the red colorant composition derived from iridoid compounds at a color value (E10%1 cm) of 0.05 and is adjusted to have a pH being 5.0 using McIlvaine buffer.
Dependencies are inferred from the claim text.