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Related Experiment Videos

Increasing thermospray response for cortisol by derivatization.

J Paulson1, C Lindberg

  • 1Bioanalytical Chemistry, AB Draco, Lund, Sweden.

Journal of Chromatography
|August 21, 1991
PubMed
Summary
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Cortisol can be selectively acetylated at the 21-hydroxyl group under mild conditions. This acetylation enhances detection sensitivity using thermospray liquid chromatography-mass spectrometry for biological fluid analysis.

Area of Science:

  • Biochemistry
  • Analytical Chemistry
  • Mass Spectrometry

Background:

  • Cortisol analysis in biological fluids is crucial for diagnosing various endocrine disorders.
  • Existing analytical methods may require derivatization or lack sufficient sensitivity.
  • Selective derivatization can improve analyte detectability and assay performance.

Purpose of the Study:

  • To develop a mild and selective acetylation method for cortisol.
  • To evaluate the impact of acetylation on cortisol detection sensitivity using thermospray liquid chromatography-mass spectrometry (LC-MS).
  • To compare the performance of this method with existing techniques for cortisol determination.

Main Methods:

  • Selective acetylation of the 21-hydroxyl group of cortisol using acetic anhydride and triethylamine in acetonitrile.

Related Experiment Videos

  • Analysis of acetylated cortisol using thermospray mass spectrometry.
  • Comparison of signal-to-noise ratios and limits of detection between acetylated and underivatized cortisol.

    • Main Results:

    • Selective acetylation of cortisol at the 21-hydroxyl group was achieved under mild conditions within 15 minutes.
    • Thermospray mass spectrometry of cortisol 21-acetate showed minimal fragmentation with the [M + H]+ ion as the base peak.
    • Acetylation increased the signal-to-noise ratio by approximately fourfold, with a limit of detection of 0.24 pmol for cortisol 21-acetate.

    Conclusions:

    • Mild and selective acetylation of cortisol enhances detection sensitivity in thermospray LC-MS.
    • This derivatization strategy makes thermospray LC-MS a competitive alternative to gas chromatography-mass spectrometry for cortisol analysis.
    • The developed method offers a sensitive and efficient approach for quantifying cortisol in biological samples.