title: Electrocatalytic detection of dopamine in the presence of ascorbic acid and uric acid using single-walled carbon nanotubes modified electrode.
abstract: Single-walled carbon nanotubes (SWCNTs) fabricated by sodium dodecyl sulfate (SDS) (f-SWCNTs) modified glassy carbon electrodes (f-SWCNTs/GCE) for the simultaneous determination of ascorbic acid (AA), dopamine (DA) and uric acid (UA). The f-SWCNTs/GCE displayed very good electrochemical catalytic activities with respect to GCE. The oxidation over-potentials of DA and UA decreased dramatically, and their oxidation peak currents increased significantly at f-SWCNTs/GCE compared to those obtained at the bare GCE. Simultaneously, the oxidation peak currents of AA decreased accordingly. The f-SWCNTs/GCE not only divide the overlapping voltammetric responses of them into individual voltammetric peaks, but also totally eliminate the interference from AA and distinguish DA from UA. The catalytic peak currents obtained from square-wave voltammetry increased linearly with increasing DA concentrations in the range of 5.0×10(-6) to 1.0×10(-4)M with a detection limit of 2.0×10(-8)M (S/N=3). The method was also successfully applied for determination of DA and showed good recovery in some biological fluids.
authors.affiliation: Key Laboratory of Bioelectrochemistry & Environmental Analysis of Gansu Province, College of Chemistry & Chemical Engineering, Northwest Normal University, Lanzhou 730070, China.
authors.forename: Yaya
authors.initials: Y
authors.lastname: Li
authors.forename: Jie
authors.initials: J
authors.lastname: Du
authors.forename: Jiandong
authors.initials: J
authors.lastname: Yang
authors.forename: Dong
authors.initials: D
authors.lastname: Liu
authors.forename: Xiaoquan
authors.initials: X
authors.lastname: Lu
mesh_terms: D001205:Ascorbic Acid / Q000737:chemistry*; D002384:Catalysis; D004298:Dopamine / Q000032:analysis / Q000737:chemistry*; D004566:Electrodes; D036103:Nanotechnology; D037742:Nanotubes, Carbon / Q000737:chemistry*; D014527:Uric Acid / Q000737:chemistry*
chemical_list: D037742:Nanotubes, Carbon; D014527:Uric Acid; D001205:Ascorbic Acid; D004298:Dopamine