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(M/EH076) Biotransformation of Metal Complexes by Bacteria: Correlating Complexes Stabilities with Metal Uptake Through Voltammetry. Ledes, Desiderio1, Rodriguez, Edwin1, Castro, Raul2, Lozano, Cesar1, 1 2 ABSTRACT- The voltammetric behavior for Copper(II), Niquel (II), and Cobalt (III) complexes with EDTA, 1,2-CyDTA, 1,3-CyDTA, and 1,4-CyDTA, where CyDTA stands for Cyclohexa-nediamine-N',N',N",N"-tetraacetate, in aqueous solu-tion was studied. The aim of the project is to esta-blish a correlation between the voltammetric response of these complexes and the bioactivity of some bacte-ria that can growth in a media "contaminated" with metal ions. Cyclic voltammetry results showed that the Copper complexes with 1,3-CyDTA and 1,4-CyDTA had a higher cathodic current than those for the 1,2-CyDTA and EDTA complexes. This trend was also observed for the ability of several bacteria isolated from the Yabucoa Bay in the Northeast part of the island of Puerto Rico for the uptake of the metal ions in solu-tion. Those bacteria includes several bacillus and cocci. A higher bio-activity was observed toward the 1,2-CyDTA and EDTA Copper complexes for most of the bacteria studied. The effect of the stability of the complexes on the ability of the bacteria to biotrans-form the complexes is discussed. Key words: Biotansformation, Metal uptake, Voltrammetry, Complex Stability |
