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Related Experiment Videos

[Methyl-D3]2hypericin as internal standard for quantification in human plasma.

Georgios Piperopoulos1, Andrea Kiehne, Arnd Ingendoh

  • 1Institut für Organische Chemie, Eberhard-Karls Universität Tübingen, Auf der Morgenstelle 18, 72076 Tübingen, Germany.

Analytical and Bioanalytical Chemistry
|March 29, 2003
PubMed
Summary

A new deuterated hypericin (1-D(6)) was synthesized for quantifying hypericin in human plasma. This isotope-dilution liquid chromatography-mass spectrometry method enables accurate measurements in the ng/mL range.

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Area of Science:

  • Analytical Chemistry
  • Pharmacology
  • Organic Synthesis

Background:

  • Hypericin is a natural compound with potential therapeutic applications.
  • Accurate quantification of hypericin in biological matrices is crucial for pharmacokinetic and pharmacodynamic studies.
  • Existing quantification methods may lack the sensitivity or specificity required for low concentrations.

Purpose of the Study:

  • To describe the synthesis and fragmentation of deuterated hypericin ([methyl-D(3)](2)hypericin, 1-D(6)).
  • To demonstrate the utility of 1-D(6) as an internal standard for hypericin quantification in human plasma.
  • To establish a reliable isotope-dilution liquid chromatography-mass spectrometry (LC-MS) method for hypericin analysis.

Main Methods:

  • Multistep synthesis of [methyl-D(3)](2)hypericin (1-D(6)).

Related Experiment Videos

  • Negative ion-electrospray ionization (ESI) mass spectrometry for fragmentation analysis.
  • Isotope-dilution LC-MS with an ion-trap system for quantification in human plasma.

    • Main Results:

    • Successful synthesis and characterization of 1-D(6) with its fragmentation pattern elucidated.
    • Demonstration of 1-D(6) as an effective internal standard for hypericin quantification.
    • Establishment of linear standard curves from 1 to 10 ng/mL in human plasma with high accuracy, precision, and recovery.

    Conclusions:

    • Deuterated hypericin (1-D(6)) is a suitable internal standard for hypericin quantification.
    • Isotope-dilution LC-MS provides an accurate and sensitive method for measuring hypericin in human plasma.
    • The developed method supports further research into hypericin's biological activity and therapeutic potential.