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- W2051279604 abstract "An octadecyl-sulfonated silica (ODSS) stationary phase specially designed for performing capillary electrochromatography (CEC) at relatively strong electroosmotic flow (EOF) proved useful for the separations of some nucleosides and bases. The ODSS stationary phase is composed of a hydrophilic, negatively charged sublayer to which a nonpolar top layer containing octadecyl ligands is covalently attached. The charged sublayer contains sulfonic acid groups which ensure a relatively strong EOF. Due to the presence of permanently charged sulfonic acid groups in the sublayer, the hydrophilic nature of the sublayer and the hydrophobic character of the top octadecyl layer, retention and selectivity of charged and relatively polar nucleosides and bases on the ODSS stationary phase are based on electrostatic interaction, hydrophilic interaction, and reversed-phase mechanisms. This yielded for the ODSS stationary phase a unique selectivity towards the nucleosides and bases, thus allowing their rapid separation. To gain insight into the chromatographic behavior of nucleosides and bases on the ODSS stationary phase, the results were compared to those obtained on an octadecyl-silica (ODS) capillary under otherwise the same elution conditions. Due to the difference in the nature of the organic layers on the surface of the ODSS and ODS stationary phases, the elution order on both stationary phases differed significantly, and the ODSS capillary proved more suitable for the separation of the nucleosides and bases than the ODS capillary." @default.
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- W2051279604 date "1999-01-01" @default.
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- W2051279604 title "Capillary electrochromatography with novel stationary phases: II. Studies of the retention behavior of nucleosides and bases on capillaries packed with octadecyl-sulfonated-silica microparticles" @default.
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- W2051279604 doi "https://doi.org/10.1002/(sici)1522-2683(19990101)20:1<31::aid-elps31>3.0.co;2-m" @default.
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