Document Detail

Study of electromigration effects on a pH boundary during the on-line electrokinetic preconcentration by capillary electrophoresis.
MedLine Citation:
PMID:  20737445     Owner:  NLM     Status:  In-Process    
A contribution to the description of electrokinetic effects on the pH boundary formed by sodium borate pH 9.5 and sodium phosphate pH 2.5 electrolytes for on-line preconcentration of weak acids is presented in this article. Simulations of electrokinetic injections together with experimental studies using contactless conductivity detection verified that the preconcentration is induced mainly by dissociation changes of analytes on the pH boundary and transient ITP state. Moreover, a study of the addition of organic solvent to the injection electrolyte was performed with impressive results. Subnanomolar LODs of hydroxybenzoic acids were achieved with 80% of methanol in the injection electrolyte which represents more than 70 000-fold preconcentration in comparison with classical CZE method.
Katerina Vítková; Jan Petr; Vítezslav Maier; Joanna Znaleziona; Juraj Sevcík
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Electrophoresis     Volume:  31     ISSN:  1522-2683     ISO Abbreviation:  Electrophoresis     Publication Date:  2010 Aug 
Date Detail:
Created Date:  2010-08-25     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8204476     Medline TA:  Electrophoresis     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  2771-7     Citation Subset:  IM    
Department of Analytical Chemistry, Faculty of Science, Palacký University in Olomouc, Olomouc, Czech Republic.
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