Bulk derivatization and direct injection of human cerebrospinal fluid for trace-level quantification of endogenous estrogens using trap-and-elute liquid chromatography with tandem mass spectrometry

Hui Fan, Barbora Papouskova, Karel Lemr, Jane G. Wigginton, Kevin A. Schug

Research output: Contribution to journalArticle

11 Scopus citations

Abstract

Although there are existing methods for determining estrogen in human bodily fluids including blood plasma and serum, very little information is available regarding estrogen levels in human cerebrospinal fluid (CSF), which is critical to assess in studies of neuroprotective functions and diffusion of neuroprotective estrogens across the blood-brain barrier. To address this problem, a liquid chromatography with tandem mass spectrometry method for the simultaneous quantification of four endogenous estrogens (estrone, 17α-estradiol, 17β-estradiol, and estriol) in human CSF was developed. An aliquot (300 μL) of human CSF was bulk derivatized using dansyl chloride in the sample and 10 μL was directly injected onto a restricted-access media trap column for protein removal. No off-line sample extraction or cleanup was needed. The limits of detection of estrone, 17α-estradiol, 17β-estradiol, and estriol were 17, 28, 13, and 30 pg/mL, respectively, which is in the parts-per-trillion regime. The method was then applied to human CSF collected from ischemic trauma patients. Endogenous estrogens were detected and quantified, demonstrating the effectiveness of this method.

Original languageEnglish (US)
Pages (from-to)2010-2017
Number of pages8
JournalJournal of Separation Science
Volume37
Issue number15
DOIs
StatePublished - Aug 2014

Keywords

  • Endogenous estrogen
  • Estrogenic neuroprotection
  • Human cerebrospinal fluid
  • Restricted-access media
  • Streamlined sample preparation

ASJC Scopus subject areas

  • Analytical Chemistry
  • Filtration and Separation

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