alexa Separation and migration behavior of structurally related phenothiazines in cyclodextrin-modified capillary zone electrophoresis.
Pharmaceutical Sciences

Pharmaceutical Sciences

Pharmaceutica Analytica Acta

Author(s): Chen KH, Lin CE, Liao WS, Lin WY, Hsiao YY

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Abstract The influences of buffer pH and the concentration of beta-cyclodextrins (beta-CDs) on the separation and migration behavior of 13 structurally related phenothiazines in CD-modified capillary zone electrophoresis (CD-CZE) using a phosphate background electrolyte at low pH were investigated. We focused on the separation of these phenothiazines, including the enantiomers of chiral analytes, with the use of beta-CD and hydroxypropyl-beta-CD (HP-beta-CD) as electrolyte modifiers or chiral selectors at concentrations less than 8 mM. The results indicate that the interactions of phenothiazines with beta-CDs are very strong and that effective separations of 13 analytes can be achieved with addition of 0.3 mM beta-CD or 0.5 mM HP-beta-CD in a phosphate buffer at pH 3.0. Binding constants of phenothiazines to beta-CDs were evaluated for a better understanding of the interactions of phenothiazines with beta-CDs.
This article was published in J Chromatogr A and referenced in Pharmaceutica Analytica Acta

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