title: [Fully automated immunoassay system utilizing microchip electrophoresis].
abstract: Application of microTAS (micro Total Analysis Systems) technologies utilizing chips with microfluidic channels to clinical diagnostic testing has drawn a lot of attention since it is expected to contribute to shortening reaction time, reduction of reagent/sample consumption, reducing instrument size, and other advantages of microchip electrophoresis. We have developed a fully automated immunoassay system by employing isotachophoresis followed by capillary gel electrophoresis for immunoreaction and B/F separation in microfluidic channels on polymer microchips. Laser-Induced Fluorescence (LIF) was used for detection of the sandwich immunocomplex composed of DNA-conjugate antibody, antigen and fluorescent dye-conjugated antibody. An immunoassay for PIVKA II was demonstrated on this new microTAS system utilizing the DNA-conjugated anti PIVKA II antibody and the fluorescent-dye labeled anti-prothrombin antibody. The resulting assay showed good assay performance with high sensitivity (LOD = 5mAU/mL), good reproducibility(CV = 1.0 - 5.7%) and good correlation with the commercially available PIVKA II assay kit (regression curve of y = 1.04x + 11.1, r = 0.991). The assay turn around time (TAT) was about 9 min. The PIVKA II assay will be useful for the diagnosis and prognosis of hepatocellular carcinoma.
authors.affiliation: Wako Pure Chemical Industries Ltd., Osaka 540-8605, Japan.
authors.forename: Takuma
authors.initials: T
authors.lastname: Ohtsubo
authors.forename: Isao
authors.initials: I
authors.lastname: Yamaguchi
authors.forename: Tatsuo
authors.initials: T
authors.lastname: Kurosawa
authors.forename: Tomohisa
authors.initials: T
authors.lastname: Kawabata
authors.forename: Henry G
authors.initials: HG
authors.lastname: Wada
authors.forename: Mitsuo
authors.initials: M
authors.lastname: Watanabe
authors.forename: Shinji
authors.initials: S
authors.lastname: Satomura
mesh_terms: D001331:Automation; D015415:Biomarkers / Q000032:analysis; D046209:Electrophoresis, Microchip / Q000379:methods; D005260:Female; D006801:Humans; D007118:Immunoassay / Q000379:methods*; D008297:Male; D011498:Protein Precursors / Q000032:analysis; D011516:Prothrombin / Q000032:analysis
chemical_list: D015415:Biomarkers; D011498:Protein Precursors; C008208:acarboxyprothrombin; D011516:Prothrombin