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Combined Falling Drop/Open Port Sampling Interface System for Automated Flow Injection Mass Spectrometry.

Gary J Van Berkel1, Vilmos Kertesz1, Matt Orcutt2

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A novel automated system combining falling drop and open port sampling interface (OPSI) enables rapid, no-carryover analysis for flow injection mass spectrometry. This method efficiently quantifies drugs in complex matrices and characterizes unprocessed samples.

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Area of Science:

  • Analytical Chemistry
  • Mass Spectrometry
  • Bioanalysis

Background:

  • Traditional flow injection analysis (FIA) methods can suffer from carryover and require complex sample preparation.
  • Automated, non-contact sampling techniques are desirable for high-throughput analysis and reduced contamination.

Purpose of the Study:

  • To develop and evaluate a combined falling drop/open port sampling interface (OPSI) system for automated flow injection analysis with mass spectrometry (FIA-MS).
  • To assess the analytical performance, including throughput, reproducibility, and quantitation capabilities, of the developed system.

Main Methods:

  • Utilized a standard autosampler with disposable pipet tips and microtiter plates to introduce falling sample drops (7-15 μL) onto the OPSI.
  • Optimized parameters including drop height, capillary positioning, and carrier solvent flow rate.
  • Evaluated system performance using propranolol in various matrices (water, river water, buffers) and quantified statin drugs in rat plasma.

Main Results:

  • Achieved a sample-to-sample throughput of approximately 45 seconds with a 4.5-second peak profile.
  • Demonstrated robust quantitation of propranolol and statin drugs in minimally processed biological samples.
  • Successfully characterized unprocessed neat vegetable oils and performed spatially resolved surface sampling on rat tissue sections.

Conclusions:

  • The combined falling drop/OPSI system offers a simple, automated, non-contact, and no-carryover solution for FIA-MS.
  • The system exhibits excellent analytical performance, suitable for diverse applications including bioanalysis and direct sample characterization.