Publication details

Optimization of background electrolyte composition for simultaneous contactless conductivity and fluorescence detection in capillary electrophoresis of biological samples

Authors

LAČNÁ Júlia PŘIKRYL Jan TESHIMA Norio MURAKAMI Hiroya ESAKA Yukihiro FORET František KUBÁŇ Petr

Type Article in Periodical
Magazine / Source Electrophoresis
MU Faculty or unit

Central European Institute of Technology

Citation
Web http://dx.doi.org/10.1002/elps.201900112
Doi http://dx.doi.org/10.1002/elps.201900112
Keywords Capillary electrophoresis; Contactless conductivity detection; Dual detection; Laser induced fluorescence detection; Saliva
Description In this article, optimization of BGE for simultaneous separation of inorganic ions, organic acids, and glutathione using dual (CD)-D-4-LIF detection in capillary electrophoresis is presented. The optimized BGE consisted of 30 mM 2-[4-(2-hydroxyethyl)piperazin-1-yl]ethanesulfonic acid, 15 mM 2-amino-2-hydroxymethyl-propane-1,3-diol, and 2 mM 18-crown-6 at pH 7.2 and allowed simultaneous separation of ten inorganic anions and cations, three organic acids and glutathione in 20 min. The samples were injected hydrodynamically from both capillary ends using the double-opposite end injection principle. Sensitive detection of anions, cations, and organic acids with micromolar LODs using (CD)-D-4 and simultaneously glutathione with nanomolar LODs using LIF was achieved in a single run. The developed BGE may be useful in analyses of biological samples containing analytes with differing concentrations of several orders of magnitude that is not possible with single detection mode.
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