Study of the degradation process of ofloxacin with free chlorine by using ESI-LCMSMS: Kinetic study, by-products formation pathways and fragmentation mechanisms

This study was conducted to gain a better understanding of the fate of fluoroquinolone antibacterial ofloxacin (OFX) which is the free available chlorine (FAC) in order to determine its effect during water chlorination process. The Direct reactions of FAC with OFX were quite rapid. A half-life of 7....

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Published inChemosphere (Oxford) Vol. 189; pp. 46 - 54
Main Authors Yassine, Montaha H., Rifai, Ahmad, Hoteit, Maha, Mazellier, Patrick, Al iskandarani, Mohammad
Format Journal Article
LanguageEnglish
Published England Elsevier Ltd 01.12.2017
Elsevier
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Abstract This study was conducted to gain a better understanding of the fate of fluoroquinolone antibacterial ofloxacin (OFX) which is the free available chlorine (FAC) in order to determine its effect during water chlorination process. The Direct reactions of FAC with OFX were quite rapid. A half-life of 7.7 s was measured under pseudo-first order conditions in the presence of an excess of total chlorine ([FAC]0 = 13 μM and [OFX]0 = 0.55 μM at pH 7.2 and 20 °C in buffered reagent water. Free chlorine reactions rates were of first-order type in both substrate and oxidant with specific second-order rate constants of 6.8 × 103 M−1 s−1. No induced back reactions or other interference by using thiosulfate to stop the chlorination reaction was shown. The seven products of the reaction were determined by using the LC/MS/MS analysis. Structures were investigated due to the explication of transitions obtained at different CID energies by LC-ESI-MS/MS. Pathways of the formations of these by-products were presented in this study and pathways of the fragmentations of pseudo molecular ions of the structures proposed were presented in supplementary files. •Order 1 Reaction of OFX with Free chlorine.•Seven By-products were observed during reaction.•Different ways of mechanisms have been proposed for identifying structures.•Fragmentation pathways of MSMS spectrum precise the structures of by-products.
AbstractList This study was conducted to gain a better understanding of the fate of fluoroquinolone antibacterial ofloxacin (OFX) which is the free available chlorine (FAC) in order to determine its effect during water chlorination process. The Direct reactions of FAC with OFX were quite rapid. A half-life of 7.7 s was measured under pseudo-first order conditions in the presence of an excess of total chlorine ([FAC]0 = 13 μM and [OFX]0 = 0.55 μM at pH 7.2 and 20 °C in buffered reagent water. Free chlorine reactions rates were of first-order type in both substrate and oxidant with specific second-order rate constants of 6.8 × 103 M−1 s−1. No induced back reactions or other interference by using thiosulfate to stop the chlorination reaction was shown. The seven products of the reaction were determined by using the LC/MS/MS analysis. Structures were investigated due to the explication of transitions obtained at different CID energies by LC-ESI-MS/MS. Pathways of the formations of these by-products were presented in this study and pathways of the fragmentations of pseudo molecular ions of the structures proposed were presented in supplementary files. •Order 1 Reaction of OFX with Free chlorine.•Seven By-products were observed during reaction.•Different ways of mechanisms have been proposed for identifying structures.•Fragmentation pathways of MSMS spectrum precise the structures of by-products.
This study was conducted to gain a better understanding of the fate of fluoroquinolone antibacterial ofloxacin (OFX) which is the free available chlorine (FAC) in order to determine its effect during water chlorination process. The Direct reactions of FAC with OFX were quite rapid. A half-life of 7.7 s was measured under pseudo-first order conditions in the presence of an excess of total chlorine ([FAC]  = 13 μM and [OFX]  = 0.55 μM at pH 7.2 and 20 °C in buffered reagent water. Free chlorine reactions rates were of first-order type in both substrate and oxidant with specific second-order rate constants of 6.8 × 10  M  s . No induced back reactions or other interference by using thiosulfate to stop the chlorination reaction was shown. The seven products of the reaction were determined by using the LC/MS/MS analysis. Structures were investigated due to the explication of transitions obtained at different CID energies by LC-ESI-MS/MS. Pathways of the formations of these by-products were presented in this study and pathways of the fragmentations of pseudo molecular ions of the structures proposed were presented in supplementary files.
This study was conducted to gain a better understanding of the fate of fluoroquinolone antibacterial ofloxacin (OFX) which is the free available chlorine (FAC) in order to determine its effect during water chlorination process. The Direct reactions of FAC with OFX were quite rapid. A half-life of 7.7 s was measured under pseudo-first order conditions in the presence of an excess of total chlorine ([FAC]0 = 13 μM and [OFX]0 = 0.55 μM at pH 7.2 and 20 °C in buffered reagent water. Free chlorine reactions rates were of first-order type in both substrate and oxidant with specific second-order rate constants of 6.8 × 103 M-1 s-1. No induced back reactions or other interference by using thiosulfate to stop the chlorination reaction was shown. The seven products of the reaction were determined by using the LC/MS/MS analysis. Structures were investigated due to the explication of transitions obtained at different CID energies by LC-ESI-MS/MS. Pathways of the formations of these by-products were presented in this study and pathways of the fragmentations of pseudo molecular ions of the structures proposed were presented in supplementary files.
Author Mazellier, Patrick
Al iskandarani, Mohammad
Rifai, Ahmad
Hoteit, Maha
Yassine, Montaha H.
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Keywords Degradation
Kinetic study
Chlorination
Ofloxacine
Formation and fragmentation pathways
LCMSMS
GEOF
Language English
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Snippet This study was conducted to gain a better understanding of the fate of fluoroquinolone antibacterial ofloxacin (OFX) which is the free available chlorine (FAC)...
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StartPage 46
SubjectTerms Anti-Bacterial Agents - chemistry
Chemical Sciences
Chlorination
Chlorine - chemistry
Chromatography, Liquid
Degradation
Disinfection
Formation and fragmentation pathways
Half-Life
Halogenation
Hydrogen-Ion Concentration
Kinetic study
Kinetics
LCMSMS
Ofloxacin - chemistry
Ofloxacine
Tandem Mass Spectrometry
Water Pollutants, Chemical - chemistry
Water Purification - methods
Title Study of the degradation process of ofloxacin with free chlorine by using ESI-LCMSMS: Kinetic study, by-products formation pathways and fragmentation mechanisms
URI https://dx.doi.org/10.1016/j.chemosphere.2017.08.171
https://www.ncbi.nlm.nih.gov/pubmed/28926788
https://hal.science/hal-03272605
Volume 189
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