Determination of isomeric dibenzo[a,l]pyreneadenine adducts by six different tandem mass spectrometric experiments

Jaeman Byun, Jonathon Gooden, Ragulan Ramanathan, Kai Ming Li, Ercole L. Cavalieri, Michael L. Gross

Research output: Contribution to journalArticlepeer-review

9 Scopus citations


Six different tandem-mass-spectrometric experiments were evaluated to assess their ability to distinguish four isomeric, carcinogen-modified adenines. Metastable-ion dissociations and high-energy collisional activated decompositions (HE CAD) of fast-atom bombardment (FAB)-produced ions were followed on a four-sector tandem mass spectrometer. Precursor ions were also produced by electrospray on the four-sector instrument, and they were submitted to both high-energy and electrospray ionization (ESI)-source CAD. We contrasted these means of activation with low-energy (LE) CAD of electrospray-produced ions on a triple quadrupole instrument and with post- source decompositions (PSD) of ions produced by matrix-assisted laser desorption ionization (MALDI). The latter experiment was conducted with a time-of-flight mass spectrometer. The four subject molecules were isomeric dibenzo-[a,l]pyrene (DB[a,l]P) adenine adducts, in which N1, N3, N7, and N6 positions were substituted. We used similarity indicies (SI), which were calculated from the relative abundances of common fragment ions for the isomers, to confirm quantitatively that HE GAD of FAB and ESI-produced ions can distinguish two of three, and that LE CAD and MALDI-PSD can distinguish three of the three isomers that give qualitatively identical product-ion spectra. The results also show that LE CAD and MALDI-PSD have comparable discriminating capability for these three DBP adducts.

Original languageEnglish (US)
Pages (from-to)977-986
Number of pages10
JournalJournal of the American Society for Mass Spectrometry
Issue number9
StatePublished - Sep 1997

ASJC Scopus subject areas

  • Structural Biology
  • Spectroscopy


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