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首页> 美国卫生研究院文献>Applied and Environmental Microbiology >Fate of the Nitrilotriacetic Acid-Fe(III) Complex during Photodegradation and Biodegradation by Rhodococcus rhodochrous
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Fate of the Nitrilotriacetic Acid-Fe(III) Complex during Photodegradation and Biodegradation by Rhodococcus rhodochrous

机译：三色红球菌光降解和生物降解过程中亚硝酸三乙酸-铁（III）配合物的命运

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摘要

Aminopolycarboxylic acids are ubiquitous in natural waters and wastewaters. They have the ability to form very stable water-soluble complexes with many metallic di- or trivalent ions. The iron complex nitrilotriacetic acid-Fe(III) (FeNTA) has been previously shown to increase drastically the rate of photo- and biodegradation of 2-aminobenzothiazole, an organic pollutant, by Rhodococcus rhodochrous. For this paper, the fate of FeNTA was investigated during these degradation processes. First, it was shown, using in situ 1H nuclear magnetic resonance, that the complex FeNTA was biodegraded by Rhodococcus rhodochrous cells, but the ligand (NTA) alone was not. This result indicates that FeNTA was transported and biotransformed inside the cell. The same products, including iminodiacetic acid, glycine, and formate, were obtained during the photo- and biodegradation processes of FeNTA, likely because they both involve oxidoreduction mechanisms. When the results of the different experiments are compared, the soluble iron, measured by spectrophotometry, was decreasing when microbial cells were present. About 20% of the initial iron was found inside the cells. These results allowed us to propose detailed mechanistic schemes for FeNTA degradation by solar light and by R. rhodochrous.
机译：氨基多元羧酸在天然水和废水中无处不在。它们具有与许多金属二价或三价离子形成非常稳定的水溶性络合物的能力。先前已显示，铁络合物次氮基三乙酸-Fe（III）（FeNTA）可以显着提高杜鹃红球菌对有机污染物2-氨基苯并噻唑的光降解和生物降解速度。在本文中，研究了FeNTA在这些降解过程中的命运。首先，利用原位 1 H核磁共振表明，复杂的FeNTA是由红球红球菌细胞生物降解的，而配体（NTA）并非如此。该结果表明FeNTA在细胞内被运输和生物转化。在FeNTA的光降解和生物降解过程中获得了相同的产物，包括亚氨基二乙酸，甘氨酸和甲酸盐，可能是因为它们都涉及氧化还原机理。当比较不同实验的结果时，当存在微生物细胞时，通过分光光度法测量的可溶性铁减少。在细胞内部发现了大约20％的初始铁。这些结果使我们能够提出针对FeNTA的日光和杜鹃红腐菌降解的详细机理方案。

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