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Metabolism of Carotenoids in Salmonids. Part 3. Metabolites of astaxanthin and canthaxanthin in the skin of atlantic salmon (salmo salar, L.)

✍ Scribed by Katharina Schiedt; Max Vecchi; Ernst Glinz; Trond Storebakken

Publisher
John Wiley and Sons
Year
1988
Tongue
German
Weight
515 KB
Volume
71
Category
Article
ISSN
0018-019X

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✦ Synopsis

Diets supplemented with astaxanthin and canthaxanthin, respectively, and a control diet without carotenoid additions, were fed to 1 %-year-old Atlantic salmon (Salmo sulur, L.) for one year. The integuments were investigated as to their quantitative and qualitative carotenoid composition. Astaxanthin and canthaxanthin deposited m the skin amounted to 20 and 14% of the total carotenoids only. Seventy % must be considered as metabolites of astaxanthin and canthaxanthin and 10% as basic xanthophylls also present in the control groups. Astaxanthin apparently underwent the following metabolic pathway: astaxanthin-tidoxanthin-adonixanthin-zeaxanthin-tzeaxanthin 5,6-epoxides. Reduction of the 4'-carbonyl group was stereospecific leading to the (4'R)-idoxanthin. Canthaxanthin was obviously converted to p,p-carotene uia 4'-hydroxyechinenone, echinenone, and 4-hydroxy-P,P-carotene.

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