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Slow-dissociation and slow-recombination assumptions in nonequilibrium capillary electrophoresis of equilibrium mixtures.

Authors
  • Krylova, Svetlana M
  • Dove, Peter M
  • Kanoatov, Mirzo
  • Krylov, Sergey N
Type
Published Article
Journal
Analytical Chemistry
Publisher
American Chemical Society
Publication Date
Oct 01, 2011
Volume
83
Issue
19
Pages
7582–7585
Identifiers
DOI: 10.1021/ac2018876
PMID: 21853979
Source
Medline
License
Unknown

Abstract

Nonequilibrium capillary electrophoresis of equilibrium mixtures (NECEEM) is a kinetic affinity method with both analytical and preparative applications. NECEEM requires that the dissociation of the complexes be negligible in its first phase and the recombination of the dissociated complexes be negligible in its second phase. Here, we introduce a method, which facilitates easy examination of whether or not these requirements are satisfied. We derived expressions for two parameters, termed the slow-dissociation parameter (SDP) and slow-recombination parameter (SRP), which can be used to assess the assumptions. Both parameters should be much less than 1 for the assumptions to be satisfied. We calculated the two parameters for new and previously published NECEEM experiments and found that the assumptions were satisfied in all of them. Finally, we discuss changes to NECEEM conditions that should be done if the assumptions are found not to be satisfied. The SDP/SRP assessment helps to easily validate the results of NECEEM-based analyses and thus makes the NECEEM method more robust.

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