Highly sensitive mass spectrometry of non-polar organic compounds with supercritical fluids

Quick sample preparation, high throughput analysis, and high sensitivity.

Advantage and Core Benefit

– Improves sensitivity of lipid/fatty acid detection by several orders of magnitude
– Can be developed at low cost by combining the established technologies (SFE/SFC, PTR, MS)

Background and Technology

Supercritical fluid extraction/chromatography (SFE/SFC) is a coupled separation technique that primarily relies on carbon dioxide as an extraction fluid and mobile phase on chromatography. SFE can selectively extract, transport, and deposit materials by controlling the temperature and pressure of the supercritical fluid. The extracted molecules are rapidly separated by SFC, which is higher column efficiency than HPLC.  Analytes in the supercritical fluid are depressurized into a vacuum chamber for PTR process, which efficiently ionize molecules. Due to the need to prevent precipitation of the solute in the depressurization process and the mechanism required to mix the organic solvent necessary for ionization used in conventional atmospheric pressure ionization methods, a complicated interface design and advanced engineering are needed to perform ionization without impairing peak separation.

PTR ionization mass spectrometry has been used for a long time to monitor trace-level volatile organic compounds (VOCs) in the gaseous samples. By combining this with SFE/SFC, non-volatile organic compounds with a molecular weight of 1000 or higher can be detected.

SFE/SFC hyphenated to PTR ionization mass spectrometry has the following advantages: (1) the analytes in a supercritical fluid are directly released in a closed vacuum space to ionize the molecules, an ion source can be easily designed; and (2) the carbon dioxide is not ionized, analytes in the sample are effectively ionized without interference.

Data

Detection of caffeine, long-chain fatty acids, fat-soluble vitamins, etc. with ultra-high sensitivity (several amol-fmol)

Patents/Publications

– 69th (2021) ASMS annual conference
doi.org/10.1021/acs.analchem.1c00898
– Patent not published

Researcher

Prof. Michisato Toyoda, Osaka Univ.

Expectations

We are seeking a companies who license and commercialize this technology.

Since SFC/SFE and PTR have been established as instruments, respectively, and because the ionization mechanism of PTR can be coupled with a mass spectrometer, they can be developed not only as a system but also commercialized as an attachment.

Project No. KJ-03798

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