Food coloring substances and method for their preparation
A process for modifying the taste and/or odor properties of a food coloring substance having unpleasant taste and/or odor properties is disclosed. There is also provided a process for obtaining a blue non-bleeding color that seems approvable by most health authorities. The invention is useful in food products, sweets and pharmaceutical products ingested orally.
1. A process for modifying the taste and/or odour properties of a food colouring substance having unpleasant taste and/or odour properties, which process comprises treating the food colouring substances, which includes an anthocyanin compounds with an aluminium compound, and adjusting the pH to a value of from about 5 to about 9, to produce an aluminium lake comprising said food colouring substance and said anthocyanin compound wherein the taste and/or odour properties of the lake are organoleptically masked in comparison with those of said food colouring substance.
2. A process as claimed in claim 1 , wherein the anthocyanin compound has the formula:
wherein R 1 and R 2 are each independently H, OH or OCH 3 , and R 3 , R 4 and R 5 are each independently H, a sugar residue or an acylated sugar residue.
3. A process for producing a food colouring substance, having a blue colour at a pH in the range of from about 5 to about 9, which process comprises treating a food colouring substance which is an anthocyanin compound of the formula:
wherein R 1 and R 2 are each independently H, OH or OCH 3 , and R 3 , R 4 and R 5 are each independently H, a sugar residue or an acylated sugar residue with an aluminium compound, and adjusting the pH to a value of from about 5 to about 9, to produce an aluminium lake comprising the anthocyanin compound.
4. A process as claimed in claim 3 , wherein the anthocyanin compound originates from plant parts other than petals or sepals.
5. A process as claimed in any one of the preceding claims, wherein the food colouring substance is an extract of red cabbage or purple carrot.
6. A process as claimed in any of claims 1 - 4 , wherein the food colouring substance is treated with an aluminium compound under a stably maintained pH value and wherein the stably maintained pH value is a value from pH about 5 to pH about 9.
7. A process as claimed in claim 6 , wherein the pH value is a value from pH 6to pH 8.
8. A process as claimed in any of the claims 1 to 4, in which the food colouring substance is combined with a solution or suspension of an aluminium compound, and the pH is then raised to a value of from about 5 to about 9.
9. A process as claimed in claim 8 , wherein the pH is raised to a value of from about 6 to about 8.
10. A process as claimed in any of claims 1 - 4 , in which the aluminium compound is aluminium sulphate.
11. A process as claimed in any of claims 1 - 4 , further including a step of micro encapsulating the aluminium lake.
12. A process as claimed in any of claims 1 - 4 , including a step of filtering the aluminium lake.
13. A process as claimed in any of claims 1 - 4 , further including a step of drying the aluminium lake.
14. A colouring composition, comprising a food colouring substance which includes an anthocyanin, the food colouring substance having unpleasant taste and/or odour properties, which food colouring substance is combined with an aluminium-containing compound, to form an aluminium lake, wherein the unpleasantness of the taste and/or odour of the food colouring substance is masked by said combination of the food colouring substance with the aluminium-containing compound.
15. A composition as claimed in claim 14 , wherein the food colouring substance is an anthocyanin compound of formula:
wherein R 1 and R 2 are each independently H, OH or OCH 3 , and R 3 , R 4 and R 5 are each independently H, a sugar residue or an acylated sugar residue.
16. A food colouring composition, having a blue colour at a pH in the range of from about 5 to about 9, which comprises a food colouring substance which is an anthocyanin compound of formula:
wherein R 1 and R 2 are each independently H, OH or OCH 3 , and R 3 , R 4 and R 5 are each independently H, a sugar residue or an acylated sugar residue, combined with an aluminium compound to produce an aluminium lake.
17. A composition as claimed in any one of claims 14 to 16 , wherein the food colouring substance comprises an extract of red cabbage or purple carrot.
18. A composition as claimed in any one of claims 14 to 16 , wherein the composition has a blue colour at a pH in the range of about 6 to about 8.
19. A method of modifying a food product comprising adding to the food product a composition as claimed in any of claims 14 - 16 .
20. A method as claimed in claim 19 wherein the food product includes sweets, confectionary, or a combination of sweets and confectionary.
21. A method as claimed in claim 19 wherein the food product includes a pharmaceutical product.