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J Chromatogr A ; 887(1-2): 209-21, 2000 Jul 28.
Article in English | MEDLINE | ID: mdl-10961313

ABSTRACT

The separation of basic solutes at low pH by capillary electrochromatography (CEC) has been investigated. The feasibility of separation of basic solutes by CEC was demonstrated. Influence of operational parameters, solvent composition, pH, temperature on retention and selectivity of the separation of a mixture of basic, neutral and acidic drug standards has been investigated. The observed elution behavior has been modeled to account for both chromatographic retention and differential electrophoretic mobility of the solutes. This model was verified experimentally. It is demonstrated in this work that the elution window of solutes in reversed-phase CEC is expanded to range from -1 to infinity.


Subject(s)
Electrophoresis, Capillary/methods , Acetonitriles/chemistry , Amines/chemistry , Hydrogen-Ion Concentration , Pharmaceutical Preparations/isolation & purification , Solutions , Temperature
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