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Open AccessArticle

Isolation, Characterization, and Degradation Performance of the 17β-Estradiol-Degrading Bacterium Novosphingobium sp. E2S

Institute of Organic Contaminant Control and Soil Remediation, College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China
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Authors to whom correspondence should be addressed.
These authors contributed equally to this paper.
Academic Editor: Emmanuelle Vulliet
Int. J. Environ. Res. Public Health 2017, 14(2), 115; https://doi.org/10.3390/ijerph14020115
Received: 4 November 2016 / Revised: 16 January 2017 / Accepted: 16 January 2017 / Published: 25 January 2017
(This article belongs to the Special Issue Organic Micro-Pollutants and Human Exposure)
A 17β-estradiol (E2)-degrading bacterium E2S was isolated from the activated sludge in a sewage treatment plant (STP). The morphology, biological characteristics, and 16S ribosomal RNA (rRNA) gene sequence of strain E2S indicated that it belonged to the genus Novosphingobium. The optimal degrading conditions were 30 °C and pH 7.0. The ideal inoculum volume was 5% (v/v), and a 20-mL degradation system was sufficient to support the removal ability of strain E2S. The addition of extra NaCl to the system did not benefit the E2 degradation in batch culture by this strain. Strain E2S exhibited high degradation efficiency with initial substrate concentrations of 10–50 mg·L−1. For example, in mineral salt medium containing 50 mg·L−1 of E2, the degradation efficiency was 63.29% after seven days. In cow manure samples supplemented with 50 mg·L−1 of E2, strain E2S exhibited 66.40% degradation efficiency after seven days. The finding of the E2-degrading strain E2S provided a promising method for removing E2 from livestock manure in order to reduce the potential environmental risks of E2. View Full-Text
Keywords: 17β-estradiol; estrogen; degradation; Novosphingobium sp.; cow manure 17β-estradiol; estrogen; degradation; Novosphingobium sp.; cow manure
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Li, S.; Liu, J.; Sun, M.; Ling, W.; Zhu, X. Isolation, Characterization, and Degradation Performance of the 17β-Estradiol-Degrading Bacterium Novosphingobium sp. E2S. Int. J. Environ. Res. Public Health 2017, 14, 115.

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