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Title: Novel instrument for automated pKa determination by internal standard capillary electrophoresis
Author: Cabot Canyelles, Joan Marc
Fuguet i Jordà, Elisabet
Rosés Pascual, Martí
Smejkal, Petr
Breadmore, Michael C.
Keywords: Electroforesi capil·lar
Capillary electrophoresis
Issue Date: 14-May-2015
Publisher: American Chemical Society
Abstract: The internal standard capillary electrophoresis method (IS-CE) has been implemented in a novel sequential injection−capillary electrophoresis instrument for the high-throughput determination of acidity constants (pKa) regardless of aqueous solubility, number of pKa values, or structure. This instrument comprises a buffer creation system that automatically mixes within a few seconds four reagents for in situ creation of the separation electrolyte with a pH range of 2−13, ionic strength of 10−100 mM and organic solvent content from 0% to 40%. Combined with 1.2 kV/cm and a short effective length (15 cm to the UV detector) fast 20 s electrophoretic separations can be obtained. The low standard deviation of the replicates and the low variation compared to reference values show that this system can accurately determine acidity constants of drugs by IS-CE. A single pKa can be determined in 2 min and a set of 20 measurements in half an hour, allowing rapid, simple, and flexible determination of pKa values of pharmaceutical targets.
Note: Versió postprint del document publicat a:
It is part of: Analytical Chemistry, 2015, vol. 87, num. 12, p. 6165-6172
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ISSN: 0003-2700
Appears in Collections:Articles publicats en revistes (Enginyeria Química i Química Analítica)

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