Biodegradation of Eu(III)-citrate complexes by Pseudomonas fluorescens |
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| Authors: | Y. Suzuki T. Nankawa T. Yoshida T. Ozaki T. Ohnuki A. J. Francis S. Tsushima Y. Enokida I. Yamamoto |
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| Affiliation: | (1) Department of Materials, Physics, and Energy Engineering, Graduate School of Engineering, Nagoya University; Advanced Science Research Center, Japan Atomic Energy Research Institute, Furocho, Chikusa-ku, Nagoya, 464-8603, Japan; Tokai, Ibaraki 319-1195, Japan;(2) Advanced Science Research Center, Japan Atomic Energy Research Institute, Tokai, Ibaraki 319-1195, Japan;(3) Advanced Science Research Center, Japan Atomic Energy Research Institute, Tokai, Ibaraki 319-1195, Japan;(4) Advanced Science Research Center, Japan Atomic Energy Research Institute, Tokai, Ibaraki 319-1195, Japan;(5) Advanced Science Research Center, Japan Atomic Energy Research Institute, Tokai, Ibaraki 319-1195, Japan;(6) Environmental Sciences Department, Brookhaven National Laboratory, Upton, New York 11973, USA;(7) Department of Materials, Physics, and Energy Engineering, Graduate School of Engineering, Nagoya University, Furocho, Chikusa-ku, Nagoya, 464-8603, Japan;(8) Ecotopia Science Institute, Nagoya University, Furocho, Chikusa-ku, Nagoya, 464-8603, Japan;(9) Department of Materials, Physics, and Energy Engineering, Graduate School of Engineering, Nagoya University, Furocho, Chikusa-ku, Nagoya, 464-8603, Japan |
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| Abstract: | Summary We have investigated the structure of Eu(III)-citrate complexes in aqueous solution and their degradability by Pseudomonas fluorescens. Analysis of 1:1, 1:2, and 1:5 Eu(III):citrate solutions at pH 7 by electrospray ionization mass spectrometry (ESI-MS) showed that the 2:2 Eu(III)-citrate complex is the predominant complex species at a low citrate/Eu(III) ratio, while at a high ratio, a 1:2 Eu(III)-citrate complex is formed preferably. Studies on the biodegradation of Eu(III)-citrate complex by P. fluorescens have shown that a 2:2 Eu(III)-citrate complex is resistent to degradation while a 1:2 complex transforms to a 2:2 complex with the degradation of excess citric acid. |
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