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1′-cysteaminecarbonyl-1-glutathionecarbonyl-ferrocene (Fc-GSH) was synthesized from ferrocene dicarboxylic acid and reduced glutathione (GSH) with 4 steps. IR and 1H-NMR were used to characterize the products. Then Fc-GSH was immobilized on the surface of gold electrode. Cyclic votammetry (CV) was adopted to investigate the electrochemical properties of this Fc-GSH modified electrode in the absence and presence of Cd2+ aqueous solutions. The peak oxidation potential (Ea) and reduction potential (Ec) of Fc-GSH modified electrode were observed at Ea = 0.74 V and Ec = 0.64 V (vs Ag/AgCl) before the accumulation of Cd2+. This redox process is a monoelectron chemical reaction. The anodic shift is about 80 mV in the presence of 20 nmol/L of Cd2+ aqueous solution. Moreover, this shift is in proportion to the concentration of Cd2+ when the concentration of Cd2+ is lower than 20 nmol/L. So the modified electrode can be used as probes to detect cadmium ions with the limit of 0.1 nmol/L by cyclic voltammetry.
1-cysteaminecarbonyl-1-glutathionecarbonyl-ferrocene (Fc-GSH) was synthesized from ferrocene dicarboxylic acid and reduced glutathione (GSH) with 4 steps. IR and 1H-NMR were used to characterize the products. The surface of the gold electrode. Cyclic votammetry (CV) was adopted to investigate the electrochemical properties of this Fc-GSH modified electrode in the absence and presence of Cd2 + aqueous solutions. The peak oxidation potential (Ea) and reduction potential (Ec) of Fc -GSH modified electrode were observed at Ea = 0.74 V and Ec = 0.64 V (vs Ag / AgCl) before the accumulation of Cd 2+. This redox process is a monoelectron chemical reaction. The anodic shift is about 80 mV in the presence of 20 nmol / L of Cd2 + aqueous solution. This shift is in proportion to the concentration of Cd2 + when the concentration of Cd2 + is lower than 20 nmol / L. So the modified electrode can be used as probes to detect cadmium ions with the limit of 0.1 nmol / L by cycl ic voltammetry.