Biodegradation of oxytetracycline and enrofloxacin by autochthonous microbial communities from estuarine sediments

The Science of the Total Environment
Malek HarrabiMaria F Carvalho

Abstract

This work investigated the potential of microbial communities native to an estuarine environment to biodegrade enrofloxacin (ENR) and oxytetracycline (OXY). Sediments collected from two sites in the Douro river estuary (Porto, Portugal) were used as inocula for the biodegradation experiments. Experiments were carried out for one month, during which ENR and OXY (1 mg L-1) were supplemented individually or in mixture to the cultures at 10-day intervals. Acetate (400 mg L-1) was added to the cultures every 3 days to support microbial growth. A series of experimental controls were established in parallel to determine the influence of abiotic breakdown and adsorption in the removal of the antibiotics. Removal of antibiotics was followed by measuring their concentration in the culture medium. Additionally, next-generation sequencing of the 16S rRNA gene amplicon was employed to understand how microbial communities responded to the presence of the antibiotics. At the end of the biodegradation experiments, microbial cultures derived from the two estuarine sediments were able to remove up to 98% of ENR and over 95% of OXY. The mixture of antibiotics did not affect their removal. ENR was removed mainly by biodegradation, while abiotic me...Continue Reading

Citations

May 6, 2019·International Journal of Environmental Research and Public Health·Amanda PacholakEwa Kaczorek
Feb 8, 2020·Journal of Environmental Health Science & Engineering·Xuan Thi Kim NguyenParinda Thayanukul
Feb 13, 2021·Environmental Pollution·Rayane Kunert LangbehnHugo Moreira Soares
Mar 7, 2021·The Science of the Total Environment·Dongsheng ZhengYanling Zheng
Mar 25, 2021·Environmental Science and Pollution Research International·Yuting WangXiaoli Li
Aug 8, 2021·Environmental Pollution·A PolrotG P Sharples

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