Determination of astaxanthin steroisomers and colour attributes in flesh of rainbow trout (Oncorhynchus mykiss) as a tool to distinguish the dietary pigmentation source

Moretti, V., Mentasti, T., Bellagamba, F., Luzzana, U., Caprino, F., Turchini, Giovanni, Giani, I. and Valfre, F. 2006, Determination of astaxanthin steroisomers and colour attributes in flesh of rainbow trout (Oncorhynchus mykiss) as a tool to distinguish the dietary pigmentation source, Food additives and contaminants, vol. 23, no. 11, pp. 1056-1063.

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Title Determination of astaxanthin steroisomers and colour attributes in flesh of rainbow trout (Oncorhynchus mykiss) as a tool to distinguish the dietary pigmentation source
Author(s) Moretti, V.
Mentasti, T.
Bellagamba, F.
Luzzana, U.
Caprino, F.
Turchini, Giovanni
Giani, I.
Valfre, F.
Journal name Food additives and contaminants
Volume number 23
Issue number 11
Start page 1056
End page 1063
Publisher Taylor & Francis
Place of publication London, England
Publication date 2006
ISSN 0265-203X
1464-5122
Keyword(s) carotenoids
rainbow trout
astaxanthin stereoisomers
flesh colour
Summary The presence of carotenoids in animal tissue reflects their sources along the food chain. Astaxanthin, the main carotenoid used for salmonid pigmentation, is usually included in the feed as a synthetic product. However, other dietary sources of astaxanthin such as shrimp or krill wastes, algae meal or yeasts are also available on the market. Astaxanthin possesses two identical asymmetric atoms at C-3 and C-3' making possible three optical isomers with all-trans configuration of the chain: 3S,3'S, 3R,3'S, and 3R,3'R. The distribution of the isomers in natural astaxanthin differs from that of the synthetic product. This latter is a racemic mixture, with a typical ratio of 1:2:1 (3S,3'S:3R,3'S:3R,3'R), while astaxanthin from natural sources has a variable distribution of the isomers deriving from the different biological organism that synthesized it. The high-performance liquid chromatographic (HPLC) analysis of all-trans isomers of astaxanthin was performed in different pigment sources, such as red yeast Phaffia rhodozyma, alga meal Haematococcus pluvialis, krill meal and oil, and shrimp meal. With the aim to investigate astaxanthin isomer ratios in flesh of fish fed different carotenoid sources, three groups of rainbow trout were fed for 60 days diets containing astaxanthin from synthetic source, H. pluvialis algae meal and P. rhodozyma red yeast. Moreover, the distribution of optical isomers of astaxanthin in trout purchased on the Italian market was investigated. A characteristic distribution of astaxanthin stereoisomers was detected for each pigment sources and such distribution was reproduced in the flesh of trout fed with that source. Colour values measured in different sites of fillet of rainbow trout fed with different pigment sources showed no significant differences. Similarly, different sources of pigment (natural or synthetic) produced colour values of fresh fillet with no relevant or significant differences. The coefficient of distance computed amongst the feed ingredient and the trout fillet astaxanthin stereoisomers was a useful tool to identify the origin of the pigment used on farm.
Language eng
Field of Research 030106 Quality Assurance, Chemometrics, Traceability and Metrological Chemistry
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2006, Taylor & Francis
Persistent URL http://hdl.handle.net/10536/DRO/DU:30008972

Document type: Journal Article
Collection: School of Life and Environmental Sciences
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