Electrophoretic analysis of proteins and enantiomers using capillaries modified by a successive multiple ionic-polymer layer (SMIL) coating technique.

Full 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.

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Author information

Author/s: Kitagawa, Fumihiko (F); Kamiya, Masato (M); Okamoto, Yukihiro (Y); Taji, Hiromi (H); Onoue, Satomi (S); Tsuda, Yoshiko (Y); Otsuka, Koji (K);

Affiliation: Department of Material Chemistry, Graduate School of Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto, 615-8510, Japan. fkitagawa(-atsign-)mbox.kudpc.kyoto-u.ac.jp

Journal and publication information

Publication Type: Journal Article; Research Support, Non-U.S. Gov't

Journal: Analytical and bioanalytical chemistry (Anal Bioanal Chem), published in Germany. (Language: eng)

Reference: 2006-Oct; vol 386 (issue 3) : pp 594-601

Dates: Created 2006/09/25; Completed 2007/03/26;

PMID: 16703385, status: MEDLINE (last retrieval date: 12/26/2008)

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MeSH headings (categories)

This article was linked to the MESH Headings shown below.

Electrophoresis, Capillary - instrumentation; methods
Ions
Molecular Structure
Polymers - chemistry

Polymers - chemistry
Proteins - analysis
Stereoisomerism
Surface Properties

Associated Chemicals: Ions (0) ; Polymers (0) ; Proteins (0)

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