title: Preparation of fritless capillary using avidin immobilized magnetic particles for electrochromatographic chiral separation.
abstract: In capillary electrochromatography (CEC), magnetic particles (MPs) were packed in a fused silica capillary by using the magnetic field to be retained without frits. For a chiral CEC separation, avidin was immobilized onto the surface of the MPs (AVI-MPs) as a stationary phase by using the physical adsorption technique. The injected AVI-MPs into the capillary were stably captured with the magnet (surface magnetic flux density, 250 mT) under the separation voltage of 10 kV (190 V/cm). By employing the fritless AVI-MPs packed capillary, the chiral separation of ketoprofen was successfully attained with the packing length of only 5 cm. Effects of the modification condition of avidin, pH of background solution, and the packing length on the enantioseparation were also investigated. Under the optimal condition, furthermore, the repeatability for the retention time of ketoprofen was better than 1.5% in the relative standard deviation and the capillary-to-capillary reproducibility was also acceptable in the prepared fritless capillaries.
authors.affiliation: Department of Material Chemistry, Graduate School of Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto 615-8510, Japan.
authors.forename: Yukihiro
authors.initials: Y
authors.lastname: Okamoto
authors.forename: Yukari
authors.initials: Y
authors.lastname: Ikawa
authors.forename: Fumihiko
authors.initials: F
authors.lastname: Kitagawa
authors.forename: Koji
authors.initials: K
authors.lastname: Otsuka
mesh_terms: D001360:Avidin / Q000737:chemistry*; D020374:Chromatography, Micellar Electrokinetic Capillary / Q000295:instrumentation*; D007660:Ketoprofen / Q000302:isolation & purification; D008280:Magnetics; D008855:Microscopy, Electron, Scanning; D013237:Stereoisomerism
chemical_list: D001360:Avidin; D007660:Ketoprofen