title: 2-D t-ITP/CZE determination of clinical urinary proteins using a microfluidic-chip capillary electrophoresis device.
abstract: To replace the time-consuming sample pretreatment procedure, a microfluidic chip-CE device incorporating on-chip sample desalting/preconcentration with transient isotachophoresis (ITP)/capillary zone electrophoresis (CZE) was fabricated to perform sequential on-chip sample pretreatment and CE determination of four urinary proteins in clinical samples. On-chip sample desalting, clean-up and analyte preconcentration enable removing interfering sample matrix prior to transferring analytes to separation capillary for transient ITP/CZE determination. Four important urinary proteins transferrin, β2-microglobulin, human serum albumin (HSA) and immunoglobulin G (IgG), investigated were shown to achieve quantitation limits sufficiently high to meet medical requirements, sensitivity enhancement up to 40-fold and detection limits down to 0.3, 0.05, 0.6, 0.5 mg/L, respectively. Compared to the stacking effect, the use of a large sample size was found to be the major factor for sensitivity enhancement. The method reliability is established by close to 100% recoveries and statistical agreement of results from the method developed with currently used clinical radio-immunoassay method for all four proteins investigated. Moreover, an assay time of less than 10 min is needed in the method developed as compared to 7 h for the radio-immunoassay method.
authors.affiliation: Department of Chemistry, The University of Hong Kong, Hong Kong.
authors.forename: Ruige
authors.initials: R
authors.lastname: Wu
authors.forename: William S B
authors.initials: WS
authors.lastname: Yeung
authors.forename: Ying-Sing
authors.initials: YS
authors.lastname: Fung
mesh_terms: D046209:Electrophoresis, Microchip / Q000295:instrumentation* / Q000379:methods*; D004867:Equipment Design; D006801:Humans; D007074:Immunoglobulin G / Q000652:urine; D057625:Isotachophoresis / Q000295:instrumentation* / Q000379:methods*; D011506:Proteins / Q000032:analysis*; D011507:Proteinuria / Q000652:urine*; D011863:Radioimmunoassay; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D012709:Serum Albumin; D013997:Time Factors; D014168:Transferrin / Q000652:urine; D001613:beta 2-Microglobulin / Q000652:urine
chemical_list: D007074:Immunoglobulin G; D011506:Proteins; D012709:Serum Albumin; D014168:Transferrin; D001613:beta 2-Microglobulin