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- Title
Metabolism of carotenoids in salmonids. Part 2. Distribution and absolute configuration of idoxanthin in various organs and tissues of one atlantic salmon ( Salmo salar, L.) fed with astaxanthin.
- Authors
Schiedt, Katharina; Mayer, Hans; Vecchi, Max; Glinz, Ernst; Storebakken, Trond
- Abstract
The content of total carotenoids and the ratio astaxanthin/idoxanthin ( = 3,3′-dihydroxy-β,β-carotene-4,4′-dione/3,3′,4′-trihydroxy-β,β-caroten-4-one) in varoius organs and tissues of one Atlantic salmon ( Salmo salar, L.) reared indoors in a tank were analyzed after feeding 'racemic' ((3 R,3′ R)/(3 R,3′ S; meso)/(3 S,3′ S) 1:2:) astaxanthin (90 mg/kg feed) during one yera. Configurational analysis of astaxanthin was carried out via the (−)-dicamphanate derivative and that of idoxanthin after reaction with (+)-( S)-l-(l-naphthyl)ethyl isocyanate. Separation of all eight optical isomers of idoxanthin-tricarbamate derivatives by HPLC is described. In salmon, enzymatic reduction of astaxanthin was found to be sterospecific leading to th (4′ R)-hydroxy group irrespective of the configuration at C(3′), thus resulting in four different stereoisomers of idoxanthin formed from (3 R,3′ R), (3 R,3′ S; meso)-, and (3 S3′ S)-astaxanthin present in the diet.
- Publication
Helvetica Chimica Acta, 1988, Vol 71, Issue 4, p881
- ISSN
0018-019X
- Publication type
Article
- DOI
10.1002/hlca.19880710425