マグロ•カジキ類血液におけるセレンの酸化状態と分布

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The state of oxidation and its distribution of selenium in thirteen blood specimens of two species of tuna, i.e. six individuals of yellowfin Thunnus albacares and seven individuals of bigeye Thunnus obesus, and in fourteen blood specimens of two species of marlins, i.e. seven indi-viduals of striped marlin Tetrapturus audax and seven individuals of blue marlin Makaira mazara, are presented in relation to the distribution of mercury. The content {Se(-II, 0, IV)} of the low oxidation state of selenium (-II, 0, and IV) except VI as an oxidation number was dominant in both species, and the ratios of Se(-II, 0, IV) to total selenium content (T-Se) were about 0.90 in the case of tuna and about 0.60 in the case of marlins, respectively. Moreover, Se(-II, 0, IV) correlated positively with T-Se in both species. On the other hand, there were no correlations between Se(-II, 0, IV) and total mercury content (T-Hg) in either species, and the molar ratio of Se(-II, 0, IV) to T-Hg tended to decrease drastically with the increase in T-Hg. These results suggest that the low oxidation state of selenium will be closely related to the detoxification of heavy metals such as mercury in fish blood.
公益社団法人日本水産学会の論文