TITLE

Simultaneous determination of bisphenol A, triclosan, and tetrabromobisphenol A in human serum using solid-phase extraction and gas chromatography-electron capture negative-ionization mass spectrometry

AUTHOR(S)
Dirtu, Alin C.; Roosens, Laurence; Geens, Tinne; Gheorghe, Adriana; Neels, Hugo; Covaci, Adrian
PUB. DATE
June 2008
SOURCE
Analytical & Bioanalytical Chemistry;Jun2008, Vol. 391 Issue 4, p1175
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
This study aimed at optimizing and validating a sensitive method for simultaneous determination of bisphenol A (BPA), triclosan (TCS), and tetrabromobisphenol A (TBBPA) in human serum using solid-phase extraction (SPE) and gas chromatography coupled to electron-capture negative-ionization mass spectrometry (GC-ECNI/MS). Sample preparation involved denaturation of serum proteins with formic acid followed by SPE on an Oasis HLB cartridge. Fractionation was performed on Florisil from which the phenolic compounds were eluted with methanol-dichloromethane (DCM) (5:1, v/ v). The phenolic fraction was further derivatized with pentafluoropropionic acid anhydride (30 min at 70°C). Further liquid-liquid partitioning using hexane-DCM (4:1, v/ v) and K2CO3 3% aqueous solution was used to eliminate excess reagent and acidic by-products formed during derivatization. The cleaned extract was injected into a GC-ECNI/MS system operated in selected ion monitoring mode. For thorough method validation, each step of the procedure was rigorously optimized. The method limits of quantitation for BPA, TCS, and TBBPA were 0.28 ng mL−1, 0.09 ng mL−1 and 0.05 ng mL−1, respectively. Furthermore, the method was applied to 21 Belgian human serum samples. The median concentrations obtained for BPA (0.71 ng mL−1) and TCS (0.52 ng mL−1) in Belgian human serum samples were similar to previously reported data for human fluids. Slightly higher levels of TBBPA (0.08 ng mL−1) were found in Belgium samples compared to Norwegian serum. [Figure not available: see fulltext.]
ACCESSION #
32127824

 

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