Interactions of rare earth elements with bacteria and organic ligands
Interactions of rare earth elements with bacteria and organic ligands
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DOI：
10.1016/j.jallcom.2005.04.142
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发表时间：
2006-02
影响因子：
6.2
通讯作者：
T. Ozaki;Yoshinori Suzuki;T. Nankawa;Takahiro Yoshida;T. Ohnuki;T. Kimura;A. Francis
中科院分区：
文献类型：
--
作者：
T. Ozaki;Yoshinori Suzuki;T. Nankawa;Takahiro Yoshida;T. Ohnuki;T. Kimura;A. Francis
我们研究了稀土元素Eu（III）和Ce（III，IV）与常见土壤细菌荧光假单胞菌（Pseudomonasfluorescens）和有机配体（如苹果酸、柠檬酸、铁载体（DFO）、纤维素、甲壳素和壳聚糖）的相互作用。苹果酸形成配合物与Eu（III），但苹果酸降解时，观察到苹果酸Eu（III）的比例高于100。柠檬酸与Eu（III）形成化学计量的络合物，其不被荧光假单胞菌降解。Eu（III）从DFO络合物中的吸附作为从DFO解离的游离离子而不是Eu（III）-DFO络合物发生。铈（III）在与DFO络合期间被氧化成Ce（IV）以形成Ce（IV）-DFO络合物。时间分辨激光诱导荧光光谱（TRLFS）分析表明，纤维素，甲壳素和壳聚糖，分别形成了一个弱的配合物，一个内部的球形配合物，和一个外部的球形配合物与Eu（III）。该方法还证明Eu（III）在荧光假单胞菌上的吸附环境具有与甲壳素相似的特征，并揭示Eu（III）在荧光假单胞菌上的吸附是通过多齿且主要是内球配位进行的。
We investigated the interactions of rare earth elements (REEs) Eu(III) and/or Ce(III, IV) with the common soil bacterium Pseudomonas fluorescens and organic ligands, such as malic acid, citric acid, a siderophore (DFO), cellulose, chitin, and chitosan. Malic acid formed complexes with Eu(III), but degradation of malic acid was observed when the ratio of malic acid to Eu(III) was higher than 100. Citric acid formed a stoichiometric complex with Eu(III) that was not degraded by P. fluorescens. Adsorption of Eu(III) from the DFO complex occurred as a free ion dissociated from DFO and not as the Eu(III)–DFO complex. Cerium(III) was oxidized to Ce(IV) during complexation with DFO to form the Ce(IV)–DFO complex. Time-resolved laser-induced fluorescence spectroscopy (TRLFS) analysis showed that cellulose, chitin, and chitosan, respectively, formed a weak complex, an inner-spherical complex, and an outer-spherical complex with Eu(III). This method also demonstrated that the coordination environment of Eu(III) adsorbed on P. fluorescens possessed similar characteristics to that of chitin, and revealed that adsorption of Eu(III) on P. fluorescens was through a multidentate and predominantly inner-spherical coordination.