Improved chemical stabilities for end-capped high performance liquid chromatography stationary phases based on poly(methyloctadecylsiloxane) thermally immobilized onto metalized silicas.

Authors :: da Silva CG
Collins CH
Source :: Journal of chromatography. A [J Chromatogr A] 2012 Oct 19; Vol. 1260, pp. 81-7. Date of Electronic Publication: 2012 Aug 23.
Publication Year :: 2012
Abstract: Endcapped stationary phases were prepared after thermal immobilization of poly(methyloctadecylsiloxane) (PMODS) onto zirconized and titanized silica supports. These new stationary phases have lower densities of residual hydroxyl groups, according to infrared spectroscopy and 29Si CP-MAS NMR and as shown by the symmetrical peaks of basic compounds from the Tanaka, Engelhardt and SRM 870 test mixtures. Stability tests for the endcapped stationary phases, measured using severe alkaline conditions (70:30 (v/v) methanol:0.05 mol/L K2CO3/KHCO3, pH 10, 50 °C), revealed that the stabilities of these phases are greater than the stabilities of similar nonendcapped phases. The stationary phases showed good performance for the separation of basic pharmaceuticals.<br /> (Copyright © 2012 Elsevier B.V. All rights reserved.)

Subjects :: Benzene Derivatives chemistry
Chromatography, High Pressure Liquid instrumentation
Hydrogen-Ion Concentration
Hydrophobic and Hydrophilic Interactions
Methanol chemistry
Models, Chemical
Pharmaceutical Preparations chemistry
Silicon Dioxide chemistry
Titanium chemistry
Toluene chemistry
Zirconium chemistry
Chromatography, High Pressure Liquid methods
Siloxanes chemistry

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