Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/195681
Type: Artigo de periódico
Title: New Generation Of Sterically Protected C18 Stationary Phases Containing Embedded Urea Groups For Use In High-performance Liquid Chromatography.
Author: Silva, César Ricardo
Jardim, Isabel Cristina Sales Fontes
Airoldi, Claudio
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 microm) was chemically modified with the monofunctional ethoxysilanes, [(3-octadecylurea)propyl]dimethyl and [(3-octadecylurea)propyl]diisopropyl ethoxysilanes. The phases were characterized by elemental analysis, infrared and solid-state 29Si and 13C NMR spectroscopies. Chromatographic characterizations of the new phases in 50x3.9 mm HPLC columns were performed by the separation of two different test mixtures, containing nonpolar, polar and highly basic compounds.
Subject: Chromatography, High Pressure Liquid
Magnetic Resonance Spectroscopy
Spectrophotometry, Infrared
Urea
Rights: fechado
Identifier DOI: 
Address: http://www.ncbi.nlm.nih.gov/pubmed/12613805
Date Issue: 2003
Appears in Collections:Artigos e Materiais de Revistas Científicas - Unicamp

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