title: Polymeric ionic liquid-coated capillary for capillary electrophoresis.
abstract: A new application of the polymeric ionic liquid (PIL) in capillary electrophoresis is reported. Poly(1-vinyl-3-butylimidazolium bromide) was physically adsorbed on silica capillary as the simple and effective coating for capillary electrophoresis (CE) analysis, in which the PIL is not present in the background electrolyte. The electroosmotic flow (EOF) of the PIL-coated capillary as compared with that of the bare fused-silica capillary shows a different dependence on electrolyte pH values. The EOF is reversed over a wide pH range from 3.0 to 9.0 and shows good repeatability. It is also found that the coated capillary has a good tolerance to some organic solvents, 0.1 M NaOH and 0.1 M HCl. The PIL-coated capillary has been employed in different areas. Both the basic proteins and anionic analytes can be well separated by PIL-coated capillaries in a fast and easy way. The PIL-coated capillary is also able to separate organic acid additives in a grape juice. The results showed that this type of coating provides an alternative to the CE separation of anions and basic proteins.
authors.affiliation: Key Laboratory of Chemistry of Northwestern Plant Resources, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, PR China.
authors.forename: Jing
authors.initials: J
authors.lastname: Li
authors.forename: Haifeng
authors.initials: H
authors.lastname: Han
authors.forename: Qing
authors.initials: Q
authors.lastname: Wang
authors.forename: Xia
authors.initials: X
authors.lastname: Liu
authors.forename: Shengxiang
authors.initials: S
authors.lastname: Jiang
mesh_terms: D000838:Anions / Q000032:analysis; D001628:Beverages / Q000032:analysis; D019075:Electrophoresis, Capillary / Q000295:instrumentation* / Q000379:methods*; D052578:Ionic Liquids / Q000737:chemistry*; D009930:Organic Chemicals / Q000032:analysis; D011108:Polymers / Q000737:chemistry*; D011506:Proteins / Q000032:analysis; D027843:Vitis / Q000737:chemistry
chemical_list: D000838:Anions; D052578:Ionic Liquids; D009930:Organic Chemicals; D011108:Polymers; D011506:Proteins