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Monitoring in vitro experiments using microdialysis sampling on-line with mass spectrometry.

E H Kerns1, K J Volk, S E Klohr

  • 1Bristol-Myers Squibb Pharmaceutical Research Institute, Wallingford, CT 06492, USA.

Journal of Pharmaceutical and Biomedical Analysis
|March 7, 2000
PubMed
Summary

This study introduces a novel method combining microdialysis sampling with mass spectrometry for real-time analysis of in vitro reactions. This technique enables efficient monitoring of drug metabolism and interactions.

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Area of Science:

  • Analytical Chemistry
  • Biochemistry
  • Pharmacology

Background:

  • Real-time analysis of in vitro reactions is crucial for understanding complex biological processes.
  • Current methods may lack the sensitivity or speed required for dynamic monitoring.
  • Integrating sampling and detection technologies can overcome existing limitations.

Purpose of the Study:

  • To develop and validate a method for real-time analysis of components in in vitro reactions.
  • To investigate the integration of microdialysis sampling with mass spectrometry (MS/MS and MS).
  • To determine the analytical performance of the developed system.

Main Methods:

  • On-line combination of microdialysis sampling (MD) with tandem mass spectrometry (MS/MS) and single stage mass spectrometry (MS).

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  • Optimization of apparatus and parameters for the integrated system.
  • Determination of analytical figures of merit, including the limit of identification for the drug gepirone.

    • Main Results:

    • The developed method allows for real-time analysis of in vitro reaction components.
    • Qualitative limits of identification for gepirone were determined as 100 ng/ml (thermospray) and 200 ng/ml (electrospray).
    • The system successfully monitored drug metabolites, enzymatic reactions, and ligand-protein binding.

    Conclusions:

    • The integrated microdialysis-mass spectrometry system provides a powerful tool for real-time monitoring of in vitro experiments.
    • This approach enhances the study of drug metabolism, enzymatic processes, and molecular interactions.
    • The method demonstrates good sensitivity and applicability to complex biological systems.