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Michael Vogeser, Josef Briegel, Karl Jacob

Determination of Serum Cortisol by Isotope-Dilution Liquid-Chromatography Electrospray Ionization Tandem Mass Spectrometry with On-line Extraction

A liquid chromatographic-mass spectrometric method for the determination of cortisol in serum using atmospheric pressure electrospray ionization and tandem mass spectrometry is described. During sample preparation, 150 ?l of serum were deproteinized with methanol/zinc sulfate followed by on-line solid phase extraction employing column switching. Tri-deuterated cortisol was used as the internal standard. The following transitions were monitored: cortisol, 363>309 m/z; d3-cortisol, 366>312 m/z. The total run-time was 5 minutes. The method proved linear (0–500 ?g/l; r=0.999), precise (total coefficient of variation between 5.0% and 3.2% at a mean cortisol concentration of 15.1 ?g/l and 269 ?g/l, respectively; n=16) and specific with regard to relevant endogenous and exogenous steroids.

Clinical Chemical Laboratory Medicine, Walter de Gruyter

Print ISSN: 1434-6621
Volume: 39, 10/2001
Pages: 944 - 947

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