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Continuous degradation of ciprofloxacin in a manganese redox cycling system driven by Pseudomonas putida MnB-1.

Abstract：

:Ciprofloxacin (CIP), as an extensively used antibiotic, has been widely detected at a high level in the environment and has raised environmental pollution concerns. Thus, efficient and cost-effective methods for CIP degradation are highly desired. Biologically produced manganese oxides (BioMnOx) offer a promising perspective for CIP degradation because of their catalytic reactivity and cost-effectiveness. However, the release of Mn(II) from BioMnOx prevents the further oxidation of pollutants. As a consequence, continuous CIP degradation by BioMnOx is not feasible. In this work, a manganese redox cycling system driven by Pseudomonas putida MnB-1 was constructed for continuous degradation of CIP. In such a system CIP was oxidized continuously and rapidly by re-oxidizing the formed Mn(II) to regenerate reactive BioMnOx, which also protected the strain from CIP toxicity. CIP was degraded through N-dealkylation passway. No significant loss of BioMnOx reactivity was observed in three-cycle CIP degradation process, suggesting the stability of this system. An overlooked intracellular BioMnOx, which was involved in CIP degradation, was discovered in P. putida MnB-1. Moreover, the important role of Mn(III) in facilitating CIP removal in this system was also identified. This work provides useful information to better understand the degradation of antibiotic compounds mediated by microbes in environments.

journal_name

Chemosphere

journal_title

Chemosphere

authors

Zhou NQ,Liu DF,Min D,Cheng L,Huang XN,Tian LJ,Li DB,Yu HQ

doi

10.1016/j.chemosphere.2018.07.117

subject

Has Abstract

pub_date

2018-11-01 00:00:00

pages

345-351

eissn

0045-6535

issn

1879-1298

pii

S0045-6535(18)31382-1

journal_volume

211

pub_type

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