title: [Preparation and evaluation of polyvinyl pyrrolidone-coated columns based on sol-gel chemistry for capillary electrophoresis].
abstract: Polyvinyl pyrrolidone(PVP) coating techniques based on sol-gel chemistry was investigated in this article. Multiple-step coating and single-step coating methods were developed and the coating conditions(molar ratios of MAPS to 0.1 mol/L HCl, reaction times and concentration of PVP) were selected. Electroosmosis mobility and column efficiency were used as the evaluating parameters for coated capillary columns. For multiple-step coating, the optimal sublayer sol solution was obtained by adding 0.1 mol/L hydrochloric acid to MAPS(molar ratio, 1:1) and reacted at room temperature for 2 hours. The best PVP mass concentration was 40 g/L in alcohol. For single-step coating, the sol-gel solution was obtained by mixing the following ingredients: (a)MAPS, (b) 8% PVP alcohol solution and (c) 0.1 mol/L hydrochloric acid in 1:1 molar ratio to MAPS. The mixture was kept at room temperature for 2 hours. Proper amounts of 100 g/L ammonium persulfate and 10% (V/V) N, N, N', N'-tetramethylethylenediamine were then added. The mixture was mixed ultrasonically, then centrifuged at 4,000 r/min for 5 min. The upper clean sol-gel solution was transferred into another clean vial for coating capillary column. The reproducibility of migration times and efficiencies of single-step-coated capillary was better than that of multiple-step-coated capillary. Single-step-coating method was very effective and easy. It can fit the needs in experimental work. Coating techniques based on sol-gel chemistry are prospective but still need to be further developed.
authors.affiliation: Institute of Materia Medica, Chinese Academy of Medical Science, Beijing 100050, China.
authors.forename: J L
authors.initials: JL
authors.lastname: Zhang
authors.forename: T H
authors.initials: TH
authors.lastname: Zhou
mesh_terms: D019075:Electrophoresis, Capillary / Q000295:instrumentation* / Q000379:methods; D005782:Gels; D010592:Pharmaceutic Aids; D011142:Polyvinyl Alcohol; D011205:Povidone; D015203:Reproducibility of Results
chemical_list: D005782:Gels; D010592:Pharmaceutic Aids; D011142:Polyvinyl Alcohol; D011205:Povidone