title: Sub-micrometer mesoporous SBA-15 silica rods as stationary phase for capillary electrochromatography separation.
abstract: Mesoporous SBA-15 silica rods were packed into capillary as stationary phase for capillary electrochromatography (CEC) separation. The attractive properties of the sub-micrometer material are its radical size of 400 nm and highly ordered cylindrical mesopores running along the same direction. The special structure is formed by piling of rod shape particles, which provide good permeability and facilitate the packing procedure of small size CEC column. The modified silica particles were successfully applied for the reversed-phase (RP) and ion-exchange (IE) electrochromatographic separation of non-polar and polar compounds with satisfactory efficiency (140 000 plates/m for benzene using 70% (v/v) acetonitrile). The van Deemter plot showed the hindrance to mass transfer because of the existence of pore structure. The lowest plate height of 7. 1 mm was obtained at the linear velocity of 3.2 cm/min. The prepared ion exchange column was applied to the separation of Chinese traditional medicines Ginseng and Rhizoma Gastrodiae.
authors.affiliation: Shanghai Key Laboratory of Functional Materials Chemistry, East China University of Science and Technology, Shanghai, China.
authors.forename: Lingyi
authors.initials: L
authors.lastname: Zhang
authors.forename: Zhicong
authors.initials: Z
authors.lastname: Wang
authors.forename: Weibing
authors.initials: W
authors.lastname: Zhang