Carotenoids in diets for salmonids: I. Pigmentation of rainbow trout with the individual optical isomers of astaxanthin in comparison with canthaxanthin |
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Authors: | Per Foss Trond Storebakken Katharina Schiedt Synnøve Liaaen-Jensen Erland Austreng Konrad Streiff |
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Affiliation: | 1. University of Trondheim, The Norwegian Institute of Technology, Laboratory of Organic Chemistry, N-7034 Trondheim-NTH Norway;2. Agricultural University of Norway, Department of Poultry and Fur Animal Science, N-1432 Ås-NLH Norway;3. F. Hoffmann-La Roche & Co. Ltd., Department of Vitamin and Nutrition Research, CH-4002 Basle Switzerland |
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Abstract: | Visual and chemical determinations revealed that the individual optical isomers of astaxanthin were more efficacious than canthaxanthin in pigmenting the flesh of rainbow trout (Salmo gairdneri, Richardson). The visual assessment of the astaxanthin pigmentation by means of a colour scale correlated well with the chemical determination. The same utilization was found for all three astaxanthin isomers, (3S, 3′S)-, (3R, 3′S)-, (3R, 3′R)-astaxanthin and a 1 : 2 : 1 mixture of the three isomers.No epimerization took place at the chiral centres of C-3 and C-3′ in astaxanthin. Astaxanthin and canthaxanthin were not interconverted. No metabolites were detected in the flesh. |
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