Colour-stable preparation of a magnesium chlorophyllin alkali metal salt or alkali earth metal salt from natural sources of chlorophyll
AssigneeGivaudan SA
InventorsAndrew Kendrick, Stuart David Thorpe
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Abstract
The present invention provides a method for preparing a colour-stable preparation of a magnesium chlorophyllin alkali metal salt or alkali earth metal salt from natural sources of chlorophyll. The invention further provides a colour-stable and substantially pure pigment composition comprising a vibrant green magnesium chlorophyllin in the form of an alkali metal or alkali earth metal salt, e.g. those prepared by the methods of the invention, and the use of the salts and compositions of the invention as colouring agents, in particular as food colouring agents, and as medicaments and disinfectants.
Claims27
A colour stable and water soluble pigment composition comprising as dry weight at least 90% w/w of a magnesium chlorophyllin alkali metal salt or alkali earth metal salt, wherein said composition has an E1% 1 cm at pH 9 of at least 630 at 405±3 nm and at least 126 at 653 nm±3 nm, wherein an absorbance ratio of the E1% 1 cm value at 405±3 nm to the E1% 1 cm value at 653 nm±3 nm is in the range about 3.2 to about 5.5, wherein colour stable is defined as the absorbance ratio changing by no more than about 25% after at least about 2 months of storage, for a liquid preparation or liquid pigment composition, or at least about 3 months of storage, for a dry preparation or dry pigment composition.
Dependencies are inferred from the claim text.