Stable isotope dilution method using thermospray liquid chromatography/mass spectrometry for quantification of daily cortisol production in humans

Nora V. Esteban, Alfred L. Yergey, Daniel J. Liberato, Therese Loughlin, D. Lynn Loriaux

Research output: Contribution to journalArticle

38 Scopus citations


A thermospray high‐performance liquid chromatography/mass spectrometry method for the separation and quantification of cortisol in human serum has been developed. The technique does not require derivatization, allows for both qualitative and quantitative determinations, provides increased specificity not available from conventional high‐performance liquid chromatography, and has a detection limit of 5 pmol on‐column. This isotope dilution mass spectrometry method, using d3‐cortisol as an internal standard, allows precise determinations even at low isotopic ratios (2%–5 mole%). Evidence that this technique can be applied to the quantification of serum cortisol and to the determination of daily cortisol production in humans is presented.

Original languageEnglish (US)
Pages (from-to)603-608
Number of pages6
JournalBiomedical & Environmental Mass Spectrometry
Issue number11
Publication statusPublished - Jun 1 1988


ASJC Scopus subject areas

  • Biochemistry
  • Molecular Medicine
  • Pollution

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