Improving the Sensitivity of Mass Spectrometry by Using a New Sheath Flow Electrospray Emitter Array at Subambient Pressures

Cox, Jonathan T.; Marginean, Ioan; Kelly, Ryan T.; Smith, Richard D.; Tang, Keqi

doi:10.1007/s13361-014-0856-5

Improving the Sensitivity of Mass Spectrometry by Using a New Sheath Flow Electrospray Emitter Array at Subambient Pressures

Journal Article · Fri Mar 28 00:00:00 EDT 2014 · Journal of the American Society for Mass Spectrometry

DOI:https://doi.org/10.1007/s13361-014-0856-5· OSTI ID:1166826

Cox, Jonathan T. ^[1]; Marginean, Ioan ^[1]; Kelly, Ryan T. ^[1]; Smith, Richard D. ^[1]; Tang, Keqi ^[1]

Pacific Northwest National Lab. (PNNL), Richland, WA (United States). Biological Sciences Division

Arrays of chemically etched emitters with individualized sheath gas capillaries have been developed to enhance electrospray ionization (ESI) at subambient pressures. By including an emitter array in a subambient pressure ionization with nanoelectrospray (SPIN) source, ionization and transmission efficiency can be maximized allowing for increased sensitivity in mass spectrometric analyses. The SPIN source eliminates the major ion losses at conventional ESI-mass spectrometry (MS) interface by placing the emitter in the first vacuum region of the instrument. To facilitate stable electrospray currents in such conditions we have developed an improved emitter array with individualized sheath gas around each emitter. The utility of the new emitter arrays for generating stable multi-electrosprays at subambient pressures was probed by coupling the emitter array/SPIN source with a time of flight (TOF) mass spectrometer. The instrument sensitivity was compared between single emitter/SPIN-MS and multi-emitter/SPIN-MS configurations using an equimolar solution of 9 peptides. An increase in sensitivity correlative to the number of emitters in the array was observed.

View Accepted Manuscript (DOE)

Research Organization:: Pacific Northwest National Laboratory (PNNL), Richland, WA (United States), Environmental Molecular Sciences Laboratory (EMSL)

Sponsoring Organization:: USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23)

Grant/Contract Number:: AC05-76RL01830

OSTI ID:: 1166826

Report Number(s):: PNNL-SA--96045; 48135; 47301; 400412000

Journal Information:: Journal of the American Society for Mass Spectrometry, Journal Name: Journal of the American Society for Mass Spectrometry Journal Issue: 12 Vol. 25; ISSN 1044-0305

Publisher:: American Society for Mass SpectrometryCopyright Statement

Country of Publication:: United States

Language:: English

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