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• W2037290717 abstract "A macroporous, spherical, 7 microm, polystyrene-divinylbenzene (PS-DVB), reversed-phase adsorbent (PRP-1) was evaluated as a stationary phase for the capillary electrochromatographic (CEC) separation of neutral, acidic, and basic analytes of pharmaceutical interest. Electroosmotic flow (EOF) for a PRP-1 packed capillary is nearly constant over the pH 2 to 10 range and is higher than for a silica-based C18 packed capillary on the acidic side. EOF increases with an increase in buffer acetonitrile concentration or as applied potential increases. As analyte hydrophobicity increases, analyte retention and migration time increases. Increasing buffer acetonitrile concentration reduces analyte partitioning with the PS-DVB stationary phase and analyte retention and migration time decreases. When exchange sites are present on the PS-DVB copolymer, EOF (EOF is reversed for the anion-exchanger) increases as the exchange capacity increases. An increased exchange capacity also reduces partitioning of the analyte with the PS-DVB matrix and analyte retention and migration time decrease. Because of excellent stability in an acid environment, the PRP-1 packed capillary can be used in strong acid buffer solution and weak acid and base analytes depending on pKa values can be separated as neutral species and cations, respectively. CEC separations on a PRP-1 capillary of neutral steroids, weak base pharmaceuticals (separation as cations), purines and pyrimidines (as cations), fatty acids (as undissociated species), and sulfa derivatives (as cations) are described. Efficiency for the PRP-1 packed capillary for acetone or thiourea as the analyte is about 6 x 10(4) plates m(-1)." @default.
• W2037290717 created "2016-06-24" @default.
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• W2037290717 date "2001-06-01" @default.
• W2037290717 modified "2023-10-18" @default.
• W2037290717 title "Capillary-electrochromatographic separations with copolymeric reversed-stationary phase and ion-exchanger-packed columns" @default.
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• W2037290717 doi "https://doi.org/10.1016/s0021-9673(01)00597-0" @default.
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