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Fast Enzymatic Processing of Proteins for MS Detection with a Flow-through Microreactor

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Microdialysis sampling coupled on-line to fast microbore liquid chromatography

A Chen¹, C E Lunte

¹Department of Chemistry, University of Kansas, Lawrence 66045.

Journal of Chromatography. A

|February 3, 1995

Summary

This study presents a novel system combining intravenous microdialysis with rapid liquid chromatography for real-time analysis of drugs and metabolites. The system enables fast, 1-minute interval sampling, crucial for pharmacokinetic studies.

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Area of Science:

Analytical Chemistry
Pharmacokinetics
Biomedical Engineering

Background:

Real-time monitoring of drug pharmacokinetics requires rapid analytical techniques.
Traditional methods often lack the speed for frequent sampling.
Intravenous microdialysis offers direct in vivo sampling but needs rapid on-line analysis.

Purpose of the Study:

To develop and evaluate an integrated system for on-line intravenous microdialysis and fast liquid chromatography.
To achieve rapid separation and quantification of model compounds and their metabolites.
To enable high-frequency pharmacokinetic monitoring.

Main Methods:

An on-line system combining intravenous microdialysis with microbore liquid chromatography (ODS column, 14 mm x 1 mm I.D.).
Utilized fast chromatographic separation for simultaneous analysis of caffeine, theobromine, paraxanthine, acetaminophen, and its glucuronide and sulfate conjugates.
Validated the system by monitoring pharmacokinetics after intravenous administration of acetaminophen and caffeine.

Main Results:

Achieved chromatographic resolution of caffeine, theobromine, and paraxanthine in under 1 minute.
Resolved acetaminophen and its major metabolites (glucuronide and sulfate) in 30 seconds.
Enabled on-line microdialysis sampling with a 1-minute interval.

Conclusions:

The integrated system provides rapid, on-line analysis suitable for pharmacokinetic studies.
This approach allows for high temporal resolution in monitoring drug and metabolite concentrations in vivo.
The system demonstrates potential for advancing real-time pharmacokinetic research.