A chitosan-multiwall carbon nanotube modified electrode for simultaneous detection of dopamine and ascorbic acid.
A chemically modified electrode based on a chitosan-multiwall carbon nanotube (MWNT) coated glassy carbon electrode (GCE) is described, which exhibits an attractive ability to determine dopamine (DA) and ascorbic acid (AA) simultaneously. The modified electrode exhibited a high differential pulse voltammetry (DPV) current response to DA at 0.144 V and AA at -0.029 V (vs. SCE) in a 0.1 mol l(-1) phosphate buffer solution (pH = 7.2). The properties and behaviors of the chitosan-multiwall carbon nanotube modified electrode (MC/GCE) were characterized using cyclic voltammetry (CV) and DPV methods. The mechanism for the discrimination of dopamine from ascorbic acid at MC/GCE is discussed. The linear calibration range for DA and AA were 5 x 10(-7) mol l(-1) to 1 x 10(-4) mol l(-1) (r = 0.997), and 5 x 10(-6) mol l(-1) to 1 x 10(-3) mol l(-1) (r = 0.996), respectively. The MC/GCE showed good sensitivity, selectivity and stability.
Jiang
Lingyan
L
College of Chemistry, Central China Normal University, Wuhan, People's Republic of China.
Liu
Chuanyin
C
Jiang
Liping
L
Peng
Zhen
Z
Lu
Guanghan
G
D001205:Ascorbic Acid / Q000032:analysis*; D002138:Calibration; D002384:Catalysis; D002686:Chitin / Q000031:analogs & derivatives* / Q000737:chemistry*; D048271:Chitosan; D004298:Dopamine / Q000032:analysis*; D004563:Electrochemistry / Q000379:methods*; D004566:Electrodes; D004573:Electrolytes / Q000737:chemistry; D005898:Glass; D006863:Hydrogen-Ion Concentration; D008854:Microscopy, Electron; D037742:Nanotubes, Carbon / Q000737:chemistry*; D011108:Polymers / Q000737:chemistry; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D014867:Water / Q000032:analysis
D004573:Electrolytes; D037742:Nanotubes, Carbon; D011108:Polymers; D014867:Water; D002686:Chitin; D048271:Chitosan; D001205:Ascorbic Acid; D004298:Dopamine