淡水魚コウライケツギョよりTunaxanthin立体異性体8種の分離〔英文〕

概要

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The carotenoids in the integuments of Siniperca scherzeri (Kouraiketsugyo in Japanese) which belongs to the division percichthyes and is a native fresh-water fish of the Republic of Korea were investigated. Tunaxanthin believed to be a characteristic carotenoid of marine fish was a major carotenoid (35.1% of the total carotenoid) and consisted of eight stereoisomers i.e. tunaxanthin A, B, C, D, E, G, H, and I. Therefore, the assumption that tunaxanthin might be a chemical indicator in the division percichthyes has been proved by the present investigation. Lutein F was first isolated in fresh-water fish. (6R, 6'R)-, (6R, 6'S: meso)-, and (6S, 6'S)-ε, ε-carotene-3, 3'-dione as a key intermediate in reductive metabolic pathway of astaxanthin to tunaxanthin in fish were isolated along with (3R, 3'R)-, (3R, 3'S: meso)- and (3S, 3'S)-zeaxanthin, and (3R, 3'R)-, (3R, 3'S: meso)-, and (3S, 3'S)-astaxanthin. Accordingly, the presence of the reductive metabolic pathways of three stereoisomers of astaxanthin into tunaxanthin A, B, C, D, E, G, H, and I via three stereoisomers of zeaxanthin, and three stereoisomers of ε, ε-carotene-3, 3'-dione has been demonstrated in S. scherzeri.