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Titolo:
BIOAVAILABILITY OF ALL-E-ASTAXANTHIN AND Z-ISOMERS OF ASTAXANTHIN IN RAINBOW-TROUT (ONCORHYNCHUS-MYKISS)
Autore:
BJERKENG B; FOLLING M; LAGOCKI S; STOREBAKKEN T; OLLI JJ; ALSTED N;
Indirizzi:
AGR RES COUNCIL NORWAY,INST AQUACULTURE RES,AKVAFORSK N-6600 SUNNDALSORA NORWAY HIST,INST FOOD SCI & TECHNOL N-7004 TRONDHEIM NORWAY BIOMAR N-8430 MYRE NORWAY BIOMAR DK-7330 BRANDE DENMARK
Titolo Testata:
Aquaculture
fascicolo: 1-2, volume: 157, anno: 1997,
pagine: 63 - 82
SICI:
0044-8486(1997)157:1-2<63:BOAAZO>2.0.ZU;2-B
Fonte:
ISI
Lingua:
ENG
Soggetto:
TRANS-BETA-CAROTENE; HUMAN-SERUM CONCENTRATIONS; HUMAN PLASMA; ATLANTIC SALMON; VITAMIN-A; INTESTINAL-ABSORPTION; DIETARY ASTAXANTHIN; 9-CIS-RETINOIC ACID; GEOMETRICAL-ISOMERS; MIXED MICELLES;
Keywords:
PIGMENTATION; ASTAXANTHIN E/Z-STEREOISOMERS; COLOR TRISTIMULI ANALYSIS; BIOAVAILABILITY; APPARENT DIGESTIBILITY, RETENTION; RAINBOW TROUT (ONCORHYNCHUS MYKISS);
Tipo documento:
Article
Natura:
Periodico
Citazioni:
88
Recensione:
Indirizzi per estratti:
Citazione:
B. Bjerkeng et al., "BIOAVAILABILITY OF ALL-E-ASTAXANTHIN AND Z-ISOMERS OF ASTAXANTHIN IN RAINBOW-TROUT (ONCORHYNCHUS-MYKISS)", Aquaculture, 157(1-2), 1997, pp. 63-82

Abstract

Two cold-pelleted diets containing either 36.9 or 35.4 mg kg(-1) of predominantly all-E-astaxanthin (97% of total astaxanthin) or a mixtureof all-E-and Z-astaxanthin (64 and 36%, respectively), were fed to duplicate groups of rainbow trout (Oncorhynchus mykiss) in freshwater (initial weight 0.4 kg) for 69 days. Average final weight was ca. 1.0 kgfor both groups and the specific growth rate was 1.2-1.3% d(-1). The all-E-and Z-isomer mixture of astaxanthin was produced from Carophyll Pink(R) by an iodine-catalyzed isomerization. Flesh astaxanthin concentrations increased from 1.7 mg kg(-1) in the initial sample to 6-7 mg kg(-1) after 31 days. After 69 days, flesh carotenoid concentration ofthe trout fed all-E-astaxanthin tended to be higher than in trout fedthe astaxanthin stereoisomer mixture (10.0 and 8.6 mg kg(-1), respectively). At the end of the experiment, the trout fed all-E-astaxanthin had significantly redder (through the color tristimuli analysis CIE [1976], a tristimuli value) flesh than rainbow trout fed a mixture of all-E-and Z-astaxanthin. Apparent digestibility coefficients (ADC) of total astaxanthin were significantly higher in trout fed all-E-astaxanthin (79%) compared to trout fed the stereoisomer mixture (64%). No significant differences in the ADC of all-E-astaxanthin was observed between the two treatments, indicating a competitive mechanism of uptake of the different stereoisomers. ADC of all-E-astaxanthin was higher than that of 9Z- and 13Z-astaxanthin, and the ADC of 13Z-astaxanthin was significantly higher than that for 9Z-astaxanthin. This indicates thatthe Z-astaxanthin isomers are not utilized to the same extent as all-E-astaxanthin for flesh pigmentation. No significant differences were observed in total astaxanthin retention in the flesh. However, the retention of all-E-astaxanthin was higher in trout fed the stereoisomer mixture of astaxanthin than in the group fed all-E-astaxanthin. The better utilization of digestible carotenoids in the trout fed a mixture of all-E- and Z-astaxanthin isomers did not fully compensate for the low digestibility of astaxanthin in this group. No differences in astaxanthin stereoisomer composition in the flesh were observed between treatments. This indicates a selectivity in metabolism of the different stereoisomers of astaxanthin, either during absorption, transport or deposition. or their combinations and suggests that substantial isomerization of astaxanthin Z-isomers occurs in the liver. The retention of dietary astaxanthin in the flesh was as high as 24-32%. No significant differences in ADC were observed for dry matter, protein, fat or energy, while ADC for ash was significantly higher for the group fed the diet containing all-E-astaxanthin. The tendency for higher retention of digestible total astaxanthin In the flesh of trout fed a stereoisomer mixture of astaxanthin suggests that the stereoisomer composition of the dietary astaxanthin may influence the absorption capacity and bioavailability of total astaxanthin, probably by increasing intestinal micellar load of total astaxanthin. (C) 1997 Elsevier Science B.V.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 24/11/20 alle ore 11:01:51