title: Electrophoretic analysis of proteins and enantiomers using capillaries modified by a successive multiple ionic-polymer layer (SMIL) coating technique.
abstract: The applicability of three-layer coatings consisting of three different polymers (A(+)-B(-)-C(+) coating) prepared by a successive multiple ionic-polymer layer (SMIL) coating technique to the immobilization of polypeptides and/or proteins onto the inner surface of the capillaries was investigated to provide a high-performance separation medium for proteins and enantiomers in capillary electrophoresis (CE). To obtain a stable protein-coated capillary, high molecular mass poly(ethyleneimine) (PEI) was employed as the first layer in the A(+)-B(-)-C(+) coating, and then a cationic protein was immobilized as the third layer. Comparisons of analytical performances between the A(+)-B(-)-C(+) coating and the conventional SMIL-coated (A(+)-B(-)-A(+) coating) capillary were conducted. The CE separation of cationic proteins was successfully achieved with the prepared capillaries. In addition, the polypeptide- and protein-coated capillaries were applied to the chiral separation of a binaphthyl compound. It should be noted that the chiral separation efficiency was strongly dependent on the second anionic polymer layer of the coating. Effects of the interaction between oppositely charged ionic polymer layers on the separation efficiency are discussed.
authors.affiliation: Department of Material Chemistry, Graduate School of Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto, 615-8510, Japan. fkitagawa@mbox.kudpc.kyoto-u.ac.jp
authors.forename: Fumihiko
authors.initials: F
authors.lastname: Kitagawa
authors.forename: Masato
authors.initials: M
authors.lastname: Kamiya
authors.forename: Yukihiro
authors.initials: Y
authors.lastname: Okamoto
authors.forename: Hiromi
authors.initials: H
authors.lastname: Taji
authors.forename: Satomi
authors.initials: S
authors.lastname: Onoue
authors.forename: Yoshiko
authors.initials: Y
authors.lastname: Tsuda
authors.forename: Koji
authors.initials: K
authors.lastname: Otsuka
mesh_terms: D019075:Electrophoresis, Capillary / Q000295:instrumentation / Q000379:methods*; D007477:Ions; D015394:Molecular Structure; D011108:Polymers / Q000737:chemistry; D011506:Proteins / Q000032:analysis*; D013237:Stereoisomerism; D013499:Surface Properties
chemical_list: D007477:Ions; D011108:Polymers; D011506:Proteins