Improved Flesh Pigmentation of Rainbow Trout (<i>Oncorhynchus mykiss</i>) by Feeding <i>Z</i>-Isomer-Rich Astaxanthin Derived from Natural Origin

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  • Osawa Yukiko
    Biotechnology R&D Group, ENEOS Corporation
  • Nishi Ryuta
    Department of Marine Biosciences, Tokyo University of Marine Science and Technology
  • Kuwahara Daichi
    Biotechnology R&D Group, ENEOS Corporation
  • Haga Yutaka
    Department of Marine Biosciences, Tokyo University of Marine Science and Technology
  • Honda Masaki
    Faculty of Science & Technology, Meijo University

Abstract

<p>The use of Paracoccus carotinifaciens-derived natural astaxanthin as an alternative to synthetic astaxanthin has attracted considerable attention from the aquaculture industry. Furthermore, to enhance the bioavailability of astaxanthin, its “Z-isomerization” has been actively studied in recent years. This study investigated the effects of feeding a diet containing astaxanthin rich in the all-E- or Z-isomers derived from P. carotinifaciens on the pigmentation and astaxanthin concentration in rainbow trout (Oncorhynchus mykiss) flesh. Z-Isomer-rich astaxanthin was prepared from the P. carotinifaciens-derived all-E-isomer by thermal treatment in fish oil, and the prepared all-E-isomer-rich astaxanthin diet (E-AST-D; total Z-isomerratio = 9.1%) and Z-isomer-rich astaxanthin diet (Z-AST-D; total Z-isomer ratio of astaxanthin = 56.6%) were fed to rainbow trout for 8 weeks. The feeding of Z-AST-D resulted in greater pigmentation and astaxanthin accumulation efficiency in the flesh than those fed E-AST-D. Specifically, when E-AST-D was fed to rainbow trout, the SalmoFan score and astaxanthin concentration of the flesh were 22.1±1.4 and 1.36±0.71 μg/g wet weight, respectively, whereas when Z-AST-D was fed, their values were 26.0±2.5 and 5.33±1.82 μg/g wet weight, respectively. These results suggest that P. carotinifaciens-derived astaxanthin Z- isomers prepared by thermal isomerization are more bioavailable to rainbow trout than the all-E-isomer.</p>

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