キンギョCarassius auratusにおけるLuteinおよびZeaxanthinのケトカロテノイドへの生体内代謝〔魚類のカロテノイドに関する比較生化学的研究-23-〕

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In order to determine which carotenoid is metaboized to astaxanthin, test diets containing either lutein or zeaxanthin were fed to goldfish for a period of 30 days. In the integuments of goldfish fed on zeaxanthin, amounts of zeaxanthin (25.8 times), β-carotene triol (6.6), β-doradexanthin (5.0) and astaxanthin (3.1) increased significantly. By contrast, when lutein was fed, there was an obvious in lutein (44.9), 3'-epilutein (31.8), α-carotene triol (7.6) and α-doradexanthin (9.5), the amount of astaxanthin decreased. Furthermore, β-doradexanthin was not detected. These results are compatible with the pathways proposed by HATA et al. (1972). Moreover, the new intermediates, 3'-epilutein and α-carotene triol have been identified in the pathway from lutein to α-doradexanthin. It was concluded that the schemata for the metabolic pathways of lutein and zeaxanthin should be respectively as follows: lutein→3'-epilutein→α-carotene triol→α-doradexanthin; and zexanthin→β-carotene triol→β-doradexanthin→astaxanthin respectively. The absence of β-doradexanthin and the decrease in hte astaxanthin content in the goldfish fed on lutein suggests that the goldfish is not able to convert α-structure to β-structure. This conclusion contradicts the pathway proposed by KATAYAMA et al. (1970).
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