Exploring Crown Ethers as Shift Reagents for Ion Mobility Spectrometry

Amy E. Hilderbrand, Sunnie Myung, and David E. Clemmer*
Department of Chemistry, Indiana University, Bloomington, Indiana 47405
Anal. Chem., 2006, 78 (19), pp 6792–6800
DOI: 10.1021/ac060439v
Publication Date (Web): August 23, 2006
Copyright © 2006 American Chemical Society

Abstract

A series of crown ethers, 12-crown-4, 15-crown-5, 18-crown-6, and dibenzo-30-crown-10, are examined as a possible means of shifting the mobilities of peptide ions. In this approach, a crown ether is added to a solution containing a mixture of peptides and is electrosprayed into the gas phase in order to create distributions of peptide−crown complexes. The ion complexes have different mobilities than the naked peptide ions, and the crown ether molecules appear to interact specifically with basic sites in the peptides thus providing some sequence selectivity. After the peptide−crown complexes are separated by ion mobility spectrometry, the ions can be collisionally activated to dissociate the complex (forming the naked peptide ions) prior to m/z analysis. The overall effect is that complex formation shifts peptide ions to different regions of the mobility spectrum, extending the ability to resolve components. The approach is illustrated by examining isobaric dipeptides as well as a combinatorial library containing 27 tripeptides. Cross sections for the series of crown ether ions and complexes that are observed are reported.

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History

  • Published In Issue October 01, 2006
  • Received for review March 9, 2006. Accepted July 19, 2006.

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