期刊
JOURNAL OF CHROMATOGRAPHY A
卷 1260, 期 -, 页码 81-87出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.chroma.2012.08.048
关键词
Endcapping reaction; Poly(methyloctadecylsiloxane); Thermal immobilization; Metalized stationary phases; Stability
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 Si-29 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) methano1:0.05 mol/L K2CO3/KHCO3, pH 10, 50 degrees 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. (C) 2012 Elsevier B.V. All rights reserved.
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