title: Retention behavior of neutral solutes in pressurized flow-driven capillary electrochromatography using an ODS column.
abstract: Several alkyl benzenes are separated by pressurized flow-driven capillary electrochromatography using a temperature-controlled capillary column packed with octadecyl siloxane-modified silica gel, and the effect of applied voltage on the retention is investigated. The van't Hoff plot shows good linearity at the column temperature between 305 and 330 K under applications from -6 to +6 kV. The applied voltage causes a relatively large variation in the enthalpy and the entropy of transfer of the solute from the mobile phase to the stationary phase (> 20%). However, the direction of variation in the enthalpy is almost opposite to that in the entropy, both of which might compensate each other. Therefore, the retention factor is not significantly varied (< 4%) by the application of voltage.
authors.affiliation: Department of Materials Science and Engineering, Graduate School of Engineering, Nagoya Institute of Technology, Gokiso, Showa, Nagoya 466-8555, Japan.
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Nakagawa
authors.forename: Shinya
authors.initials: S
authors.lastname: Kitagawa
authors.forename: Shuki
authors.initials: S
authors.lastname: Araki
authors.forename: Hajime
authors.initials: H
authors.lastname: Ohtani