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Related Experiment Videos

A four-column parallel chromatography system for isocratic or gradient LC/MS analyses.

C K Van Pelt1, T N Corso, G A Schultz

  • 1Advanced BioAnalytical Services, Inc., Ithaca, New York 14850, USA.

Analytical Chemistry
|February 24, 2001
PubMed
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This study introduces a novel parallel liquid chromatography/tandem mass spectrometry (LC/MS/MS) method. The technique enhances sample throughput for pharmacokinetic assays by analyzing multiple samples simultaneously, improving efficiency.

Area of Science:

  • Analytical Chemistry
  • Biochemistry
  • Pharmacology

Background:

  • Quantitative bioanalysis, particularly pharmacokinetic assays, demands high sample throughput.
  • Conventional liquid chromatography/tandem mass spectrometry (LC/MS/MS) systems can be a bottleneck in high-throughput laboratories.
  • Existing methods often require significant system modifications or specialized equipment.

Purpose of the Study:

  • To present a novel, cost-effective parallel chromatography approach for LC/MS/MS analyses.
  • To demonstrate the system's capability for enhancing sample throughput in quantitative applications.
  • To validate the method's accuracy and precision using a real-world pharmacokinetic assay.

Main Methods:

  • Modification of a conventional LC/MS system with three valves and four LC columns.

Related Experiment Videos

  • Staggered injection of samples onto the four columns to enable continuous mass spectrometer analysis.
  • Optimization of run time to slightly exceed the sum of desired peak widths.
  • Application of both gradient and isocratic LC conditions.
  • Analysis of atorvastatin, its metabolites, and deuterated internal standards in spiked human plasma.

    • Main Results:

    • The parallel chromatography system achieved a throughput increase by a factor of 2.7 compared to conventional methods.
    • Overall run time was reduced from 4.5 to 1.65 minutes for the specific analysis.
    • Quality control samples exhibited relative standard deviation and accuracy within 8.1% and 9.6%, respectively.
    • The system demonstrated robust performance under gradient elution conditions.

    Conclusions:

    • The developed parallel LC/MS/MS system offers a significant improvement in sample throughput for pharmacokinetic and quantitative assays.
    • Modest system modifications allow for parallel analysis without compromising accuracy or precision.
    • This approach provides a practical and efficient solution for high-throughput bioanalytical laboratories.