Title:
CONVERSION OF XANTHOPHYLL COMPOUNDS
Document Type and Number:
Japanese Patent JP3828252
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To convert lutein or its natural ester into zeaxanthin capable of giving a strong gold color in a high yield by subjecting the lutein or its natural ester to a basic catalyst isomerization reaction under specific reaction conditions.
SOLUTION: (A) A natural lutein-containing material or pure lutein, if necessary, preliminarily treated is thermally converted into zeaxanthin at a temperature of approximately 50°C or higher (preferably a temperature of ≤120°C) in the mixture of (B) either of dimethyl sulfoxide or an organic solvent based on a saturated aliphatic and/or aromatic hydrocarbon with (C) an alkali metal hydroxide aqueous solution. When the organic solvent based on the hydrocarbon is used in the method, the reaction is carried out in the presence of a phase transfer catalyst.
Inventors:
Kurt Bernhard
Alfred Giegel
Alfred Giegel
Application Number:
JP26953997A
Publication Date:
October 04, 2006
Filing Date:
October 02, 1997
Export Citation:
Assignee:
DSM IP ASSETS B.V.
International Classes:
B01J31/02; C07C403/24; C07B35/08; C07B61/00; C09B61/00; (IPC1-7): C07C403/24; B01J31/02; C07B35/08; //C07B61/00
Foreign References:
| US5523494 |
Other References:
ANDREWES A. G.,Isomerization of ε-Carotene to β-Carotene and of Lutein to Zeaxanthin,Acta Chem. Scand.,1974年,B 28 (1),p.137-138
Attorney, Agent or Firm:
Hajime Tsukuni