A study of electrospray ionization emitters with differing geometries with respect to flow rate and electrospray voltage

Brent R. Reschke, Aaron T. Timperman

Research output: Contribution to journalArticlepeer-review

Abstract

The performance of several electrospray ionization emitters with different orifice inside diameters (i.d.s), geometries, and materials are compared. The sample solution is delivered by pressure driven flow, and the electrospray ionization voltage and flow rate are varied systematically for each emitter investigated, while the signal intensity of a standard is measured. The emitters investigated include a series of emitters with a tapered outside diameters (o.d.) and unaltered i.d.s, a series of emitters with tapered o.d.s and i.d.s, an emitter with a monolithic frit and a tapered o.d., and an emitter fabricated from polypropylene. The results show that for the externally etched emitters, signal was nearly independent of i.d. and better ion utilization was achieved at lower flow rates. Furthermore, emitters with a 50 μm i.d. and an etched o.d. produced about 1.5 times more signal than etched emitters with smaller i.d.s and about 3.5 times more signal than emitters with tapered inner and outer dimensions. Additionally, the work presented here has important implications for applications in which maximizing signal intensity and reducing frictional resistance to flow are necessary. Overall, the work provides an initial assessment of the critical parameters that contribute to maximizing the signal for electrospray ionization sources interfaced with pressure driven flows.

Original languageEnglish (US)
Pages (from-to)2115-2124
Number of pages10
JournalJournal of the American Society for Mass Spectrometry
Volume22
Issue number12
DOIs
StatePublished - Dec 2011
Externally publishedYes

Keywords

  • Electrospray ionization
  • Electrospray voltage
  • Etched open-tubular emitter
  • Flow rate
  • Polymeric emitter
  • Pulled tip emitter
  • Reserpine

ASJC Scopus subject areas

  • Structural Biology
  • Spectroscopy

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