Abstract: The present invention provides a method for preparing astaxanthin from zeaxanthin. Specifically, the present invention provides a method for said conversion using a halogenating agent with the salt of chloric or bromic acid in an inert solvent.
Abstract: A method of preparing &bgr;-carotene derivatives such as canthaxanthin and astaxanthin is described. The method employs an in situ system to generate hypobromous acid as the oxidizing agent using a salt of sulfite, hydrogen sulfite or bisulfite in combination with a bromate salt. Astaxanthin and canthaxanthin are obtained in good yield with a significantly reduced reaction time.
Type:
Grant
Filed:
September 13, 2001
Date of Patent:
April 16, 2002
Assignee:
Prodemex, S.A. DE C.V.
Inventors:
George C. Schloemer, Danuta A. Schloemer, Jeffery L. Davis
Abstract: The present invention provides an industrial scale process for obtaining lutein and zeaxanthin concentrates of high purity from saponified marigold extracts that may have high levels of chlorophyll.
Abstract: A method of isomerizing lutein to yield a mixture of epimers of zeaxanthin includes the following steps: mixing a lutein-containing extract in a glycol solution to obtain a mixture, treating the mixture with alkali to obtain an alkali-containing mixture, reacting the alkali-containing mixture in the presence of heat for a duration consistent with achieving a desired level of isomerization of lutein to zeaxanthin.
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