Original scientific paper

https://doi.org/10.5599/admet.491

Lipophilicity determination of acidic compounds: MEEKC as a reliable high-throughput methodology

Xavier Subirats ; Institute of Biomedicine (IBUB) and Department of Chemical Engineering and Analytical Chemistry, Universitat de Barcelona, Martí i Franquès 1-11, 08028 Barcelona, Spain
Lídia Redón ; Institute of Biomedicine (IBUB) and Department of Chemical Engineering and Analytical Chemistry, Universitat de Barcelona, Martí i Franquès 1-11, 08028 Barcelona, Spain
Martí Rosés ; Institute of Biomedicine (IBUB) and Department of Chemical Engineering and Analytical Chemistry, Universitat de Barcelona, Martí i Franquès 1-11, 08028 Barcelona, Spain

Abstract

In the present study a pressure-assisted MEEKC method with reversed-polarity using a conventional CE instrument with UV detection and uncoated fused silica capillaries is validated as a high-throughput methodology for the lipophilicity determination of the neutral species of acidic compounds (pKa > 3.5). After the calibration of the system with four standard compounds of known log Po/w, mass distribution ratios (log kMEEKC) of new molecules can be directly converted into log Po/w values by means of a simple linear equation (log Po/w=a·log kMEEKC+b). The method was internally and externally validated for a log Po/w range between -1.54 and 4.75, with higher accuracies than conventional liquid chromatographic methods.

Keywords

Capillary electrophoresis; hydrophobicity; log Po/w; microemulsion electrokinetic chromatography

Hrčak ID:

201570

URI

https://hrcak.srce.hr/201570

Publication date:

16.6.2018.

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