Journal
JOURNAL OF CHROMATOGRAPHY A
Volume 932, Issue 1-2, Pages 129-137Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S0021-9673(01)01246-8
Keywords
anion selective exhaustive injection; injection methods; micellar electrokinetic chromatography; sample stacking; sweeping; surfactants; carboxylic acids; amino acids; naphthalenedisulfonic acids
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A selective on-line sample concentration technique of anion selective exhaustive injection (ASEI)-sweep-micellar electrokinetic chromatography (MEKC) was evaluated using a cationic surfactant. To suppress the electroosmotic flow, a polyacrylamide-coated capillary was introduced. Some aromatic carboxylic acids, dansyl amino acids, and naphthalene-disulfonic acids were used as test analytes. About 1000- to 6000-fold increases in detection sensitivity were obtained in terms of peak heights by ASEI-sweep-MEKC. (C) 2001 Elsevier Science B.V. All rights reserved.
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