Abstract
Bisphenol A (BPA) is a synthetic industrial reactant used in the production of polycarbonate plastics, and genistein is a natural phytoestrogen abundant in the soybean. Current studies investigating the endocrine-disrupting effects of concomitant exposures to BPA and genistein have warranted the development of an analytical method for the simultaneous measurement of BPA and genistein, as well as their primary metabolites, bisphenol A ß-d-glucuronide (BPA gluc) and genistein 4′-ß-d-glucuronide (genistein gluc), respectively. All four analytes were extracted from rat plasma via solid phase extraction (SPE). Three SPE cartridges and four elution schemes were tested. Plasma extraction using Bond Elut Plexa cartridges with sequential addition of ethyl acetate, methanol, and acetonitrile yielded optimal average recoveries of 98.1 ± 1.8% BPA, 94.9 ± 8.0% genistein, 91.4 ± 6.1% BPA gluc, and 103 ± 6.1% genistein gluc. Identification and quantification of the four analytes were performed by a validated HPLC-MS/MS method using electrospray ionization and selective reaction monitoring. This novel analytical method should be applicable to the measurement of BPA, genistein, BPA gluc, and genistein gluc in urine, cultures, and tissue following in vivo exposures. While reports of the determination of BPA and genistein independently exist, the simultaneous optimized extraction and detection of BPA, genistein, BPA gluc, and genistein gluc have not previously been reported.
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Abbreviations
- ESI:
-
Electrospray ionization
- HPLC:
-
High-performance liquid chromatography
- MS:
-
Mass spectrometry
- MS/MS:
-
Tandem MS
- RSD:
-
Relative standard deviation
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Acknowledgments
The authors would like to thank the National Institutes of Health (grant no. T32ES007148), National Institute of Environmental Health Sciences (grant no. ES05022), and Environmental and Occupational Health Sciences Institute for financial support. A special thank you to Stuart Shalat for performing the statistical analysis for residual percent error.
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Coughlin, J.L., Winnik, B. & Buckley, B. Measurement of bisphenol A, bisphenol A ß-d-glucuronide, genistein, and genistein 4′-ß-d-glucuronide via SPE and HPLC-MS/MS. Anal Bioanal Chem 401, 995–1002 (2011). https://doi.org/10.1007/s00216-011-5151-8
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DOI: https://doi.org/10.1007/s00216-011-5151-8