title: Hollow nitrogen-doped carbon microspheres pyrolyzed from self-polymerized dopamine and its application in simultaneous electrochemical determination of uric acid, ascorbic acid and dopamine.
abstract: Hollow nitrogen-doped carbon microspheres (HNCMS) as a novel carbon material have been prepared and the catalytic activities of HNCMS-modified glassy carbon (GC) electrode towards the electro-oxidation of uric acid (UA), ascorbic acid (AA) and dopamine (DA) have also been investigated. Comparing with the bare GC and carbon nanotubes (CNTs) modified GC (CNTs/GC) electrodes, the HNCMS modified GC (HNCMS/GC) electrode has higher catalytic activities towards the oxidation of UA, AA and DA. Moreover, the peak separations between AA and DA, and DA and UA at the HNCMS/GC electrode are up to 212 and 136 mV, respectively, which are superior to those at the CNTs/GC electrode (168 and 114 mV). Thus the simultaneous determination of UA, AA and DA was carried out successfully. In the co-existence system of UA, AA and DA, the linear response range for UA, AA and DA are 5-30 μM, 100-1000 μM and 3-75 μM, respectively and the detection limits (S/N = 3) are 0.04 μM, 0.91 μM and 0.02 μM, respectively. Meanwhile, the HNCMS/GC electrode can be applied to measure uric acid in human urine, and may be useful for measuring abnormally high concentration of AA or DA. The attractive features of HNCMS provide potential applications in the simultaneous determination of UA, AA and DA.
authors.affiliation: State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Lushan Southern Road, Changsha 410082, PR China.
authors.forename: Chunhui
authors.initials: C
authors.lastname: Xiao
authors.forename: Xiaochen
authors.initials: X
authors.lastname: Chu
authors.forename: Yan
authors.initials: Y
authors.lastname: Yang
authors.forename: Xing
authors.initials: X
authors.lastname: Li
authors.forename: Xiaohua
authors.initials: X
authors.lastname: Zhang
authors.forename: Jinhua
authors.initials: J
authors.lastname: Chen
mesh_terms: D001205:Ascorbic Acid / Q000737:chemistry / Q000652:urine*; D015374:Biosensing Techniques / Q000379:methods*; D002244:Carbon; D004298:Dopamine / Q000737:chemistry / Q000652:urine*; D055664:Electrochemical Techniques; D006801:Humans; D057230:Limit of Detection; D008855:Microscopy, Electron, Scanning; D008863:Microspheres; D009584:Nitrogen; D010084:Oxidation-Reduction; D011108:Polymers / Q000737:chemistry; D014527:Uric Acid / Q000737:chemistry / Q000652:urine*
chemical_list: D011108:Polymers; D014527:Uric Acid; D002244:Carbon; D009584:Nitrogen; D001205:Ascorbic Acid; D004298:Dopamine