title: Chromatographic and column stability at pH 7 of a C18 dimethylurea polar stationary phase.
abstract: Chromatographic evaluations of a C18 dimethylurea phase in 150 mm x 3.9 mm HPLC columns were performed using the Tanaka and Engelhardt test mixtures. The applicability of the new C18 dimethylurea phase was also evaluated with a mixture of some herbicides and their metabolites. An artificial aging procedure was also performed by passing a potassium phosphate mobile phase buffered at pH 7.0 through C18 50 mm x 3.9 mm dimethylurea columns. The column stability was evaluated by means of the chromatographic parameters obtained for the separation of some compounds from the Neue test mixture, using apolar, polar and highly basic analytes.
authors.affiliation: Instituto de Química, Universidade Estadual de Campinas, Caixa Postal 6154, 13083-970 Campinas, São Paulo, Brazil.
authors.forename: César Ricardo
authors.initials: CR
authors.lastname: Silva
authors.forename: Carol H
authors.initials: CH
authors.lastname: Collins
authors.forename: Isabel Cristina Sales Fontes
authors.initials: IC
authors.lastname: Jardim
authors.forename: Claudio
authors.initials: C
authors.lastname: Airoldi
mesh_terms: D002851:Chromatography, High Pressure Liquid / Q000295:instrumentation*; D006863:Hydrogen-Ion Concentration; D008782:Methylurea Compounds / Q000737:chemistry*
chemical_list: D008782:Methylurea Compounds