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High-throughput microcoil NMR of compound libraries using zero-dispersion segmented flow analysis.

Roger A Kautz1, Wolfgang K Goetzinger, Barry L Karger

  • 1The Barnett Institute of Chemical and Biological Analysis, Northeastern University, 360 Huntington Avenue, Boston, Massachusetts 02115, USA. rkautz@lynx.neu.edu

Journal of Combinatorial Chemistry
|January 11, 2005
PubMed
Summary

A new automated system for nuclear magnetic resonance (NMR) using segmented flow analysis significantly boosts sample throughput and utilization. This method enables rapid, efficient analysis of small sample volumes in high-field NMR facilities.

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Area of Science:

  • Analytical Chemistry
  • Nuclear Magnetic Resonance Spectroscopy

Background:

  • Traditional sample loading methods for microcoil NMR probes can be inefficient, limiting throughput and sample utilization.
  • High-field NMR facilities often face challenges with sample handling due to long transfer lines.

Purpose of the Study:

  • To develop an automated system for loading samples into a microcoil NMR probe.
  • To enhance the throughput and sample utilization of NMR analysis.
  • To ensure applicability in high-field NMR settings with extended sample transfer distances.

Main Methods:

  • Development of an automated system employing segmented flow analysis.
  • Utilizing a sample handler to draw 2 microL sample volumes from 96-well plates.
  • Pumping samples as closely spaced plugs separated by immiscible fluorocarbon fluid to a 0.5-microL microcoil NMR probe.

Related Experiment Videos

  • Implementing stopped-flow data acquisition with automated positioning of sample plugs via NMR signal detection.

    • Main Results:

    • Achieved a 2-fold enhancement in throughput compared to direct injection and flow injection methods.
    • Improved sample utilization by 3-fold.
    • Reduced sample losses to below 5% over a 3-m transfer line due to fluorocarbon wetting of the capillary.
    • Maintained sample-to-sample carryover below 1% with solvent wash plugs.
    • Demonstrated minimal sample dispersion, enabling multi-day trace analysis.
    • Recorded spectra at a rate of 1.5 min/sample with a 16-second acquisition time, consuming <0.5 mL solvent per 96-well plate.

    Conclusions:

    • The developed automated segmented flow system offers a robust and efficient solution for microcoil NMR sample loading.
    • This method significantly improves analytical efficiency and is well-suited for high-throughput screening and trace analysis in demanding NMR environments.
    • The system minimizes sample loss and carryover, ensuring data integrity and reducing reagent consumption.