title: Influence of the TiO2 content on the chromatographic performance and high pH stability of C18 titanized phases.
abstract: To extend pH stability, protective metal oxide layers, such as titanium oxide, that are more stable in alkaline medium, can be chemically bonded to the chromatographic silica surface prior to reaction with silanes. In the present work, the influence of the titanium oxide content on the chromatographic performance was investigated by synthesizing a C18 phase onto a doubly-titanized silica support and comparing its chromatographic performance with a C18 phase on singly-titanized silica. The Engelhardt and Tanaka test mixtures were used for chromatographic characterizations using short HPLC columns. The column lifetimes of these titanized phases were also compared by performing accelerated aging tests at 50 degrees C using aggressive phosphate mobile phases at pH 10.
authors.affiliation: Instituto de Química, Universidade Estadual de Campinas, Caixa Postal 6154, 13084-971 Campinas, SP, Brazil.
authors.forename: César R
authors.initials: CR
authors.lastname: Silva
authors.forename: Claudio
authors.initials: C
authors.lastname: Airoldi
authors.forename: Kenneth E
authors.initials: KE
authors.lastname: Collins
authors.forename: Carol H
authors.initials: CH
authors.lastname: Collins
mesh_terms: D002851:Chromatography, High Pressure Liquid / Q000295:instrumentation / Q000379:methods*; D006863:Hydrogen-Ion Concentration; D009682:Magnetic Resonance Spectroscopy; D014025:Titanium / Q000737:chemistry*
chemical_list: C009495:titanium dioxide; D014025:Titanium