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Analytical and Bioanalytical Chemistry

, Volume 401, Issue 1, pp 353–363 | Cite as

Identification of biotransformation products of macrolide and fluoroquinolone antimicrobials in membrane bioreactor treatment by ultrahigh-performance liquid chromatography/quadrupole time-of-flight mass spectrometry

  • Senka Terzic
  • Ivan Senta
  • Marin Matosic
  • Marijan AhelEmail author
Original Paper

Abstract

Ultrahigh-performance liquid chromatography coupled to quadrupole time-of-flight mass spectrometry was applied for the identification of transformation products (TPs) of fluoroquinolone (norfloxacin and ciprofloxacin) and macrolide (azithromycin, erythromycin, and roxitromycin) antimicrobials in wastewater effluents from a Zenon hollow-fiber membrane bioreactor (MBR). The detected TPs were thoroughly characterized using the accurate mass feature for the determination of the tentative molecular formulae and MS-MS experiments for the structural elucidation of unknowns. Several novel TPs, which have not been previously reported in the literature, were identified. The TPs of azithromycin and roxithromycin, identified in MBR effluent, were conjugate compounds, which were formed by phosphorylation of desosamine moiety. Transformation of fluoroquinolones yielded two types of products: conjugates, formed by succinylation of the piperazine ring, and smaller metabolites, formed by an oxidative break-up of piperazine moiety to form the 7-[(2-carboxymethyl)amino] group. A semi-quantitative assessment of these TPs suggested that they might have contributed significantly to the overall balance of antimicrobial residues in MBR effluents and thus to the overall removal efficiency. Determination of TPs during a period of 2 months indicated a conspicuous dynamics, which warrants further research to identify microorganisms involved and treatment conditions leading to their formation.

Figure

Proposed structures of the novel transformation products of antimicrobials, formed during MBR wastewater treatment. AZI TP – phosphorylated azithromycin; ROX TP -phosphorylated roxithromycin; NOR TP1 – succinyl norfloxacin; CIP TP1 – succinyl ciprofloxacin; NOR TP2 - 7-[(carboxymethyl)amino]-1-ethyl-6-fluoro-4-oxo-1,4-dihydroquinoline-3-carboxylic acid; CIP TP2 - 7-[(carboxymethyl)amino]-1-cyclopropyl-6-fluoro-4-oxo-1,4-dihydroquinoline-3-carboxylic acid.

Keywords

Antimicrobials Fluoroquinolone Macrolide Transformation products Membrane bioreactor Liquid chromatography–mass spectrometry 

Notes

Acknowledgments

This work was financially supported by the Ministry of Science, Education and Sports of the Republic of Croatia through the project on organic contaminants as molecular markers of the anthropogenic impact on the environment (Project No: 098-0982934-2712). Technical assistance of Nenad Muhin is also gratefully acknowledged.

Supplementary material

216_2011_5060_MOESM1_ESM.pdf (502 kb)
(PDF 501 kb)

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Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  • Senka Terzic
    • 1
  • Ivan Senta
    • 1
  • Marin Matosic
    • 2
  • Marijan Ahel
    • 1
    Email author
  1. 1.Division of Marine and Environmental ResearchRudjer Boskovic InstituteZagrebCroatia
  2. 2.Faculty of Food Technology and BiotechnologyUniversity of ZagrebZagrebCroatia

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