Unusual covalent bond-breaking reactions of β-cyclodextrin inclusion complexes of nucleobases/nucleosides and related guest molecules

Ana K. Vrkic, Richard A J O'Hair, Carlito B Lebrilla

Research output: Contribution to journalArticle

10 Scopus citations

Abstract

Host-guest complexes between nucleobases or nucleosides and β-cyclodextrin can be observed by electrospray ionization mass spectrometry (ESI-MS) and their relative abundances appear to correlate with the condensed-phase binding order. Using Fourier transform ion cyclotron resonance mass spectrometry, the extent of the interactions between the host oligosaccharide and guest species have also been examined for permethylated β-cyclodextrin : adenine/deoxyadenosine and permethylated maltoheptaose : adenine/deoxyadenosine using gas-phase exchange reactions with the gaseous amines, n-propylamine and ethylenediamine. The ease of guest exchange in the gas-phase follows the order : deoxyadenosine > adenine ≫ deoxycytidine > cytosine, which is in contrast to their relative binding order in solution. Collision-induced dissociation (CID) has been used to probe the fragmentation behavior of oligosaccharide : nucleobase/nucleoside complexes. Under these conditions the inclusion complexes either (a) dissociate, (b) result in cleavage of the host oligosaccharide or (c) result in cleavage of the guest molecule. This study has shown that the preferred dissociation pathway of these complexes depends on the structures of both the cyclodextrin and guest molecule.

Original languageEnglish (US)
Pages (from-to)563-577
Number of pages15
JournalEuropean Journal of Mass Spectrometry
Volume9
Issue number6
DOIs
StatePublished - 2003

Keywords

  • β-cyclodextrin
  • Collision-induced dissociation
  • Electrospray ionization
  • Fragmentation
  • Inclusion complexes
  • Ion-molecule reactions
  • Nucleobases
  • Nucleotides
  • Tandem mass spectrometry

ASJC Scopus subject areas

  • Spectroscopy
  • Atomic and Molecular Physics, and Optics

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