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A new and simple method based on the mechanism of detoxification of metallothionein was developed by using a water-soluble porphyrin and Zn(II)-bound metallothionein for evaluating heavy metal toxicity. Labile Zn(II) ions were released when toxic metal ions such as Cu(II), Pb(II), Bi(III), Cd(II), Hg(II), Co(II), Ag(I), and Ni(II) bound to Zn(II)-bound metallothionein. The water-soluble porphyrin,...
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