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Microchimica Acta

, 186:668 | Cite as

Fluorometric determination for ofloxacin by using an aptamer and SYBR Green I

  • Haoyang Yi
  • Zhiyu Yan
  • Lumei WangEmail author
  • Xiaotong Zhou
  • Rui Yan
  • Dongwei Zhang
  • Guoqing Shen
  • Shanshan Zhou
Original Paper
  • 95 Downloads

Abstract

A fluorometric method is described for the determination of ofloxacin (OFL). It is based on the use of the fluorescent intercalator SYBR Green I (SG-I). The OFL-aptamer has G-quadruplex structures and can be recognized by SG-I. It results in strong fluorescence of SG-I. If OFL is present, OFL will bind to its aptamer to form stable complexes. This induces the despiralization of partial dsDNA regions, leads to changes in the structure of the aptamer. Thus, SG-I is released from the OFL-aptamer into solution. Hence, the fluorescence of SG-I drops. Fluorescence decreases linearly in the 1.1 to 200 nM OFL concentration range, and the limit of detection is 0.34 nM. The method shows good selectivity to much interference including analogues, hormones, pesticides. It is also effortless and fast with the times of measurement of <40 min. In addition, good recoveries of 91.3–119.0% were found for tap water, river water and artificial urine spiked with OFL with relative standard deviation (RSD) of ≤11.6%.

Graphical abstract

A sensitive fluorometric method is developed for ofloxacin (OFL) detection in aqueous samples based on the fluorescence intensity change of SYBR Green I (SG-I) with or without OFL.

Keywords

Fluorometry SG-I Detection G-quadruplex Quinolones Fluoroquinolones Antibiotics Assay 

Notes

Acknowledgements

This work was sponsored by the National Key Research and Development Program of China (2017YFD0800704), the National Natural Science Foundation of China (21876109 & 41877494), and the Natural Science Foundation of Zhejiang Province (LY18B070029).

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

Supplementary material

604_2019_3788_MOESM1_ESM.docx (608 kb)
ESM 1 (DOCX 607 kb)

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Copyright information

© Springer-Verlag GmbH Austria, part of Springer Nature 2019

Authors and Affiliations

  1. 1.School of Agriculture and Biology, Key Laboratory of Urban Agriculture, Ministry of Agriculture, Bor S. Luh Food Safety Research CenterShanghai Jiao Tong UniversityShanghaiPeople’s Republic of China
  2. 2.Meteorological Bureau of LiupanshuiLiupanshuiPeople’s Republic of China
  3. 3.College of EnvironmentZhejiang University of TechnologyHangzhouPeople’s Republic of China

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