title: Microchip capillary electrophoresis with electrochemical detection.
abstract: A novel microchip capillary electrophoresis system with electrochemical detection, using the replaceable microelectrode, is first reported. This kind of electrode can be fabricated in general laboratories and can be replaced quickly with electrodes of different materials according to the requirements of experiments. The end-column electrochemical detection on microchip CE was achieved by fixing the working electrode (such as carbon fiber, Pt, or Au, etc.) through a guide tube on the end of the separation channel. The experiment results indicate that the alignment of the electrode with the channel outlet can be carried out accurately and reproducibly, and therefore, the detection device has low noise and good reproducibility. The detection limit of dopamine is 2.4 x 10(-7) M, which is the lowest result reported so far. The separation and detection of dopamine, 5-hydroxytryptamine and epinephrine using carbon fiber and Pt microdisk electrodes within 50 s was successfully performed.
authors.affiliation: Department of Chemistry, Wuhan University, China.
authors.forename: Yong
authors.initials: Y
authors.lastname: Zeng
authors.forename: Hong
authors.initials: H
authors.lastname: Chen
authors.forename: Dai-Wen
authors.initials: DW
authors.lastname: Pang
authors.forename: Zong-Li
authors.initials: ZL
authors.lastname: Wang
authors.forename: Jie-Ke
authors.initials: JK
authors.lastname: Cheng
mesh_terms: D001679:Biogenic Amines / Q000032:analysis*; D004209:Disposable Equipment; D004298:Dopamine / Q000032:analysis; D004563:Electrochemistry; D019075:Electrophoresis, Capillary / Q000295:instrumentation* / Q000592:standards; D004837:Epinephrine / Q000032:analysis; D008839:Microelectrodes; D008904:Miniaturization; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D012701:Serotonin / Q000032:analysis
chemical_list: D001679:Biogenic Amines; D012701:Serotonin; D004298:Dopamine; D004837:Epinephrine