We report herein an extraction method for the analysis of perfluorinated compounds in human serum
based on magnetic core–mesoporous shell microspheres with decyl-perfluorinated interior pore-walls
(Fe3O4@mSiO2-F17). Thanks to the unique properties of the Fe3O4@mSiO2-F17 microspheres, macro-
molecules like proteins could be easily excluded from the mesoporous channels due to size exclusion
effect, and perfluorinated compounds (PFCs) in protein-rich biosamples such as serum could thus be
directly extracted with the
fluorocarbon modified on the channel wall without any other pretreatment
procedure. The PFCs adsorbed Fe3O4@mSiO2-F17 microspheres could then be simply and rapidly isolated
by using a magnet, followed by being identified and quantified by LC–MS/MS (high-performance
liquid chromatography coupled to tandem mass spectrometry). Five perfluorinatedcarboxylic acids
(C6, C8–C11) and perfluorooctane sulfonate (PFOS) were selected as model analytes. In order to achieve
the best extraction efficiency, some important factors including the amount of Fe3O4@mSiO2-F17
microspheres added, adsorption time, type of elution solvent, eluting solvent volume and elution time
were investigated. The ranges of the LOD were 0.02–0.05 ng mL1 for the six PFCs. The recovery of the
optimized method varies from 83.13% to 92.42% for human serum samples.
ã 2014 Elsevier B.V. All rights reserved.
We report herein an extraction method for the analysis of perfluorinated compounds in human serum
based on magnetic core–mesoporous shell microspheres with decyl-perfluorinated interior pore-walls
(Fe3O4@mSiO2-F17). Thanks to the unique properties of the Fe3O4@mSiO2-F17 microspheres, macro-
molecules like proteins could be easily excluded from the mesoporous channels due to size exclusion
effect, and perfluorinated compounds (PFCs) in protein-rich biosamples such as serum could thus be
directly extracted with the
fluorocarbon modified on the channel wall without any other pretreatment
procedure. The PFCs adsorbed Fe3O4@mSiO2-F17 microspheres could then be simply and rapidly isolated
by using a magnet, followed by being identified and quantified by LC–MS/MS (high-performance
liquid chromatography coupled to tandem mass spectrometry). Five perfluorinatedcarboxylic acids
(C6, C8–C11) and perfluorooctane sulfonate (PFOS) were selected as model analytes. In order to achieve
the best extraction efficiency, some important factors including the amount of Fe3O4@mSiO2-F17
microspheres added, adsorption time, type of elution solvent, eluting solvent volume and elution time
were investigated. The ranges of the LOD were 0.02–0.05 ng mL1 for the six PFCs. The recovery of the
optimized method varies from 83.13% to 92.42% for human serum samples.
ã 2014 Elsevier B.V. All rights reserved.
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