Positive‐ion fast‐atom bombardment tandem mass spectrometry of peptide nucleic acids

Abstract
The base sequence of synthetic peptide nucleic acids (PNAs), novel antisense agents, was analyzed by positive-ion fast-atom bombardment tandem mass spectrometry (FAB-MS/MS). Upon high-energy collisional activation decomposition, PNA oligomers provided apparent MS/MS product ions resulting from specific cleavage along the PNA backbone.