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The Investigation of Fluorescence Spectra and Fluorescence Quantum Yield of Enrofloxacin

Received: 4 May 2018     Accepted: 30 May 2018     Published: 1 July 2018
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Abstract

In this paper, the fluorescence spectra of Enrofloxacin (ENR) in different pH conditions was studied in order to determine its structural changes due to protonation with pH changes. The ENR two-step dissociation constant is calculated and the fluorescence quantum yield under acidic conditions is measured. In the strong acidic conditions, ENR exists of H3L2+ form of which maximum emission wavelength is at 450 nm. At the condition of pH 2.45 to 4.23, ENR exists of H2L+ form with strong and steady fluorescence. The maximum emission wavelength is still 450 nm. At the condition of pH more than 4.23, the maximum emission wavelengths are gradually blue shifted to 445 nm and the fluorescence intensity decrease with the increase of pH which shows that H2L+ loses one proton with the increase of pH and exists in the form of bipolar ion HL. When the pH is more than 12.28, the fluorescence intensity are weakened to nearly disappear with the increase of pH value, indicating that HL gradually loses the proton with the conversion to the anion of L- which is weaker fluorescence. In the buffer solution of pH 3.00, with quinine sulfate as reference, the fluorescence quantum yield of ENR at excitation wavelength of 274 nm is 0.125.

Published in Journal of Chemical, Environmental and Biological Engineering (Volume 2, Issue 1)
DOI 10.11648/j.jcebe.20180201.13
Page(s) 11-16
Creative Commons

This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited.

Copyright

Copyright © The Author(s), 2018. Published by Science Publishing Group

Keywords

Enrofloxacin, Fluorescence Spectroscopy, Fluorescence Quantum Yield, Dissociation Constant

References
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  • APA Style

    Lihua Ma, Baosheng Liu, Chundan Wang, Hongcai Zhang, Xu Cheng. (2018). The Investigation of Fluorescence Spectra and Fluorescence Quantum Yield of Enrofloxacin. Journal of Chemical, Environmental and Biological Engineering, 2(1), 11-16. https://doi.org/10.11648/j.jcebe.20180201.13

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    ACS Style

    Lihua Ma; Baosheng Liu; Chundan Wang; Hongcai Zhang; Xu Cheng. The Investigation of Fluorescence Spectra and Fluorescence Quantum Yield of Enrofloxacin. J. Chem. Environ. Biol. Eng. 2018, 2(1), 11-16. doi: 10.11648/j.jcebe.20180201.13

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    AMA Style

    Lihua Ma, Baosheng Liu, Chundan Wang, Hongcai Zhang, Xu Cheng. The Investigation of Fluorescence Spectra and Fluorescence Quantum Yield of Enrofloxacin. J Chem Environ Biol Eng. 2018;2(1):11-16. doi: 10.11648/j.jcebe.20180201.13

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  • @article{10.11648/j.jcebe.20180201.13,
      author = {Lihua Ma and Baosheng Liu and Chundan Wang and Hongcai Zhang and Xu Cheng},
      title = {The Investigation of Fluorescence Spectra and Fluorescence Quantum Yield of Enrofloxacin},
      journal = {Journal of Chemical, Environmental and Biological Engineering},
      volume = {2},
      number = {1},
      pages = {11-16},
      doi = {10.11648/j.jcebe.20180201.13},
      url = {https://doi.org/10.11648/j.jcebe.20180201.13},
      eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.jcebe.20180201.13},
      abstract = {In this paper, the fluorescence spectra of Enrofloxacin (ENR) in different pH conditions was studied in order to determine its structural changes due to protonation with pH changes. The ENR two-step dissociation constant is calculated and the fluorescence quantum yield under acidic conditions is measured. In the strong acidic conditions, ENR exists of H3L2+ form of which maximum emission wavelength is at 450 nm. At the condition of pH 2.45 to 4.23, ENR exists of H2L+ form with strong and steady fluorescence. The maximum emission wavelength is still 450 nm. At the condition of pH more than 4.23, the maximum emission wavelengths are gradually blue shifted to 445 nm and the fluorescence intensity decrease with the increase of pH which shows that H2L+ loses one proton with the increase of pH and exists in the form of bipolar ion HL. When the pH is more than 12.28, the fluorescence intensity are weakened to nearly disappear with the increase of pH value, indicating that HL gradually loses the proton with the conversion to the anion of L- which is weaker fluorescence. In the buffer solution of pH 3.00, with quinine sulfate as reference, the fluorescence quantum yield of ENR at excitation wavelength of 274 nm is 0.125.},
     year = {2018}
    }
    

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  • TY  - JOUR
    T1  - The Investigation of Fluorescence Spectra and Fluorescence Quantum Yield of Enrofloxacin
    AU  - Lihua Ma
    AU  - Baosheng Liu
    AU  - Chundan Wang
    AU  - Hongcai Zhang
    AU  - Xu Cheng
    Y1  - 2018/07/01
    PY  - 2018
    N1  - https://doi.org/10.11648/j.jcebe.20180201.13
    DO  - 10.11648/j.jcebe.20180201.13
    T2  - Journal of Chemical, Environmental and Biological Engineering
    JF  - Journal of Chemical, Environmental and Biological Engineering
    JO  - Journal of Chemical, Environmental and Biological Engineering
    SP  - 11
    EP  - 16
    PB  - Science Publishing Group
    SN  - 2640-267X
    UR  - https://doi.org/10.11648/j.jcebe.20180201.13
    AB  - In this paper, the fluorescence spectra of Enrofloxacin (ENR) in different pH conditions was studied in order to determine its structural changes due to protonation with pH changes. The ENR two-step dissociation constant is calculated and the fluorescence quantum yield under acidic conditions is measured. In the strong acidic conditions, ENR exists of H3L2+ form of which maximum emission wavelength is at 450 nm. At the condition of pH 2.45 to 4.23, ENR exists of H2L+ form with strong and steady fluorescence. The maximum emission wavelength is still 450 nm. At the condition of pH more than 4.23, the maximum emission wavelengths are gradually blue shifted to 445 nm and the fluorescence intensity decrease with the increase of pH which shows that H2L+ loses one proton with the increase of pH and exists in the form of bipolar ion HL. When the pH is more than 12.28, the fluorescence intensity are weakened to nearly disappear with the increase of pH value, indicating that HL gradually loses the proton with the conversion to the anion of L- which is weaker fluorescence. In the buffer solution of pH 3.00, with quinine sulfate as reference, the fluorescence quantum yield of ENR at excitation wavelength of 274 nm is 0.125.
    VL  - 2
    IS  - 1
    ER  - 

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Author Information
  • College of Chemistry and Environmental Science, Hebei University, Baoding, China

  • College of Chemistry and Environmental Science, Hebei University, Baoding, China

  • College of Chemistry and Environmental Science, Hebei University, Baoding, China

  • College of Chemistry and Environmental Science, Hebei University, Baoding, China

  • College of Chemistry and Environmental Science, Hebei University, Baoding, China

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