Preparation of aminylferrocene/nanogold modified glassy carbon electrode and its electrocatalysis on dopamine.
Aminylferrocene(FcAI)-Nanogold(NG) modified glassy carbon electrode (FcAI/NG/GCE) was prepared by the Au-N bond between Au and FcAI. Electrochemical impedance spectroscopy (EIS) was employed to study the surface of the modified electrode. The electrochemical behavior of dopamine (DA) on the modified electrode was investigated and it was found that the modified electrode had an obvious electrocatalytic effect on DA. Compared with a bare GCE, the modified electrode exhibited an apparent shift of the oxidation peak potential in the negative potential direction and a marked enhancement in the current response for DA. We investigated the determination of DA on the modified electrode by differential pulse voltammetry (DPV). Linear calibration curve was obtained in the range of 7.0 x 10(-7) mol/L to 6x10(-4) mol/L of DA in 0.1 mol/L phosphate buffer solution (pH = 7.0) with a correlation coefficient of 0.9989. The detection limit (S/N = 3) of DA was estimated to be 1.0 x 10(-7) mol/L. Especially, by using the modified electrode, we can separate the oxidation peaks of ascorbic acid (AA) and DA in the PBS and it was satisfactory for the determination of DA with the interference of AA.
Wang
Cong
C
School of Chemistry and Materials Science, Anhui Normal University, Wuhu, Anhui 241000, PR China.
Wang
Guangfeng
G
Jiao
Shoufeng
S
Guo
Zhihua
Z
Fang
Bin
B
D000588:Amines / Q000737:chemistry*; D015374:Biosensing Techniques / Q000295:instrumentation / Q000379:methods*; D002138:Calibration; D002244:Carbon / Q000737:chemistry*; D002384:Catalysis; D004298:Dopamine / Q000032:analysis*; D004563:Electrochemistry; D004566:Electrodes; D005296:Ferrous Compounds / Q000737:chemistry*; D006046:Gold / Q000737:chemistry*; D000075163:Metallocenes; D009942:Organometallic Compounds / Q000737:chemistry*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity
D000588:Amines; D005296:Ferrous Compounds; D000075163:Metallocenes; D009942:Organometallic Compounds; D002244:Carbon; D006046:Gold; C004998:ferrocene; D004298:Dopamine