海産魚によるCoの蓄積〔英文〕

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To know the effect of chemical forms of Co on its accumulation by marine fish, the accumulation and excreton of Co by the organism were observed using 60CoCl2 and 57Co cyanocobalamin. The biological half life of the long component of 60CoCl2 was 166 days, and that of 57Co cyanocobalamin was 43 days at 15°C. The concentration factor at the steady state was calculated as 32 for 60CoCl2 and 3 for 57Co cyanocobalamin. The higher concentration factro of 60CoCl2 than 57Co cyanocobalamin was characteristic in comparison with other marine organisms. The distribution (%) of 57Co cyanocobalamin in the liver was three times higher than that of 60CoCl2. It was estimated from the gel filtrations on Sephadex G-75 and Sepharose CL-4B that 60Co combined with five constituents in the liver of Acanthopagrus schlegeli and Chasmichthys gulosus, and with two constituents in the liver of Girella punctata. The gel filtration profiles of 57Co cyanocobalamin in the liver of C. gulosus was similar to those of 60Co. These constituents were considered to be protein by referring to the optical density at 280nm. A constituent with a molecular weight of 2×105 wh ch combined with Co was characteristic in livers of fish among the marine organisms.
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