New generation of sterically protected C18 stationary phases containing embedded urea groups for use in high-performance liquid chromatography
作者： César Ricardo Silva , Isabel Cristina Sales Fontes Jardim , Claudio Airoldi
DOI: 10.1016/S0021-9673(02)01807-1
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摘要: Abstract New monofunctional C18 urea stationary phases with sterically protecting dimethyl and diisopropyl groups were prepared by a single step modification process. ProntoSil spherical silica (3 μm) was chemically modified the ethoxysilanes, [(3-octadecylurea)propyl]dimethyl [(3-octadecylurea)propyl]diisopropyl ethoxysilanes. The characterized elemental analysis, infrared solid-state 29Si 13C NMR spectroscopies. Chromatographic characterizations of new in 50×3.9 mm HPLC columns performed separation two different test mixtures, containing nonpolar, polar highly basic compounds.
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