Characterizing bacterial volatiles using secondary electrospray ionization mass spectrometry (SESI-MS)

Heather Bean, Jiangjiang Zhu, Jane E. Hill

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

Secondary electrospray ionization mass spectrometry (SESI-MS) is a method developed for the rapid detection of volatile compounds, without the need for sample pretreatment. The method was first described by Fenn and colleagues1 and has been applied to the detection of illicit drugs2 and explosives3-4, the characterization of skin volatiles5, and the analysis of breath6-7. SESI ionization occurs by proton transfer reactions between the electrospray solution and the volatile analyte, and is therefore suitable for the analysis of hetero-organic molecules, just as in traditional electrospray ionization (ESI). However, unlike standard ESI, the proton transfer process of SESI occurs in the vapor phase rather than in solution (Fig. 1), and therefore SESI is best suited for detecting organic volatiles and aerosols. We are expanding the use of SESI-MS to the detection of bacterial volatiles as a method for bacterial identification and characterization8. We have demonstrated that SESI-MS volatile fingerprinting, combined with a statistical analysis method, can be used to differentiate bacterial genera, species, and mixed cultures in a variety of growth media.8 Here we provide the steps for obtaining bacterial volatile fingerprints using SESI-MS, including the instrumental parameters that should be optimized to ensure robust bacterial identification and characterization.

Original languageEnglish (US)
Article numbere2664
JournalJournal of Visualized Experiments
Issue number52
DOIs
StatePublished - Jun 2011
Externally publishedYes

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Electrospray ionization
Electrospray Ionization Mass Spectrometry
Mass spectrometry
Protons
Proton transfer
Dermatoglyphics
Aerosols
Skin
Ionization
Statistical methods
Growth
Vapors
Molecules

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)
  • Chemical Engineering(all)
  • Immunology and Microbiology(all)
  • Neuroscience(all)

Cite this

Characterizing bacterial volatiles using secondary electrospray ionization mass spectrometry (SESI-MS). / Bean, Heather; Zhu, Jiangjiang; Hill, Jane E.

In: Journal of Visualized Experiments, No. 52, e2664, 06.2011.

Research output: Contribution to journalArticle

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