METHOD FOR OBTAINING CAROTENOIDS Russian patent published in 2007 - IPC A23L1/56 A22C29/00 

FIELD: fish industry.

SUBSTANCE: the present innovation deals with the way of obtaining carotenoids referred to biologically active substances out of shell-containing wastes of crayfish (Astacidae). The method deals with reducing the raw material followed by extraction with ethanol at 55° C during 1 h to separate the extract against dense residue due to filtration followed by repeated extracting the dense residue once or twice. Dense residue should be dried and applied to obtain chitin. The extracts obtained should be combined, ethanol should be boiled down under vacuum conditions at 70° C, not higher; the obtained water-lipid extract should be mixed with hexane. One should separate carotenoids in hexane, and boil down hexane under vacuum conditions at 60° C, not higher. The output of carotenoids corresponds to 0.65-0.75% against dry matter. The innovation enables to improve several physiological processes in human body and could be applied as a natural dyestuff in fat-containing food products and medicinal preparations obtained out of fish oil for increasing their biological value.

EFFECT: higher efficiency.

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