Determination of ion structures in structurally related compounds using precursor ion fingerprinting

  • Michelle T. Sheldon
  • Robert Mistrik
  • Timothy R. Croley


Structurally-related alkaloids were analyzed by electrospray ionization/multiple stage mass spectrometry (ESI/MS n ) at varying collision energies to demonstrate a conceptual algorithm, precursor ion fingerprinting (PIF). PIF is a new approach for interpreting and library-searching ESI mass spectra predicated on the precursor ions of structurally-related compounds and their matching product ion spectra. Multiple-stage mass spectra were compiled and constructed into “spectral trees” that illustrated the compounds’ product ion spectra in their respective mass spectral stages. The precursor ions of these alkaloids were characterized and their spectral trees incorporated into an MS n library. These data will be used to construct a universal, searchable, and transferable library of MS n spectra. In addition, PIF will generate a proposed structural arrangement utilizing previously characterized ion structures, which will assist in the identification of unknown compounds.


Heroin Oxycodone Spectral Library Spectral Fingerprint Spectral Tree 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© American Society for Mass Spectrometry 2009

Authors and Affiliations

  • Michelle T. Sheldon
    • 1
  • Robert Mistrik
    • 2
  • Timothy R. Croley
    • 1
  1. 1.Commonwealth of Virginia, Department of General ServicesDivision of Consolidated Laboratory ServicesRichmondUSA
  2. 2.HighChem, Ltd.BratislavaSlovakia

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