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Complexation of Fe by the triscatechol siderophore bacillibactin in the presence of FeCl3 and Fe-tannic acid. Formation of Fe-bacillibactin complex, expressed as a percentage of Fe complexed to bacillibactin, in the presence of 10−5 M Fe-tannic acid (circles) and 10−5 M FeCl3 (squares). Complexation was assayed in Milli-Q water supplemented with 10−5 M bacillibactin.
