METHOD FOR PREPARING STABLE LUTEIN PASTE FROM ESSENTIAL OIL Russian patent published in 2008 - IPC C07C403/24 C07C35/21 

FIELD: chemical technology.

SUBSTANCE: invention relates to a method for preparing stable lutein paste. Method involves the following steps: (a) dissolving a purified essential oil in alcohol to obtain dissolved xanthophylls esters as a clear solution after filtration; (b) purification of dissolved essential oil containing xanthophylls esters using ion-exchange resin; (c) hydrolysis of a clear solution with a base in the presence of a phase transfer catalyst in alcoholic medium; (d) rapid cooling a hydrolyzed solution at acid pH value to provide insoluble solid material at filtration; (e) dissolving a solid material in ester to obtain ester layer after filtration; (f) drying ester layer to form semisolid residue; (g) grinding semisolid residue in alcohol to prepare lutein crystals with the content of basic substance about 65% and alcoholic fraction; (h) distillation of alcoholic fraction to obtain water-insoluble fractions; (i) mixing lutein crystals from the step (g) with water-insoluble fractions from the step (h) and preparing stable lutein paste. Method provides preparing stable lutein paste with about 95% yield. Lutein paste can be used in foodstuffs and food supplements as antioxidants prepared from essential oil.

EFFECT: improved preparing method.

20 cl, 1 tbl, 7 ex