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Diverse morphologies of LaCoO 3 nanostructures have been synthesized by a facile hydrothermal process by changing the surfactants. These nanostructures were used to modify the glassy carbon electrode (GCE) for the simultaneous electrochemical detection of dopamine (DA) in the presence of excess ascorbic acid (AA) and uric acid (UA). The electrochemical behavior of modified glassy carbon electrode (GCE) was investigated by cyclic voltammetry (CV) and differential pulse voltammetry (DPV). The results confirm strong electrocatalytic activity for LaCoO 3 nanostructure prepared with urea as surfactant is better than other surfactants such as citric acid and N-cetyl-N,N,N-trimethyl-ammonium bromide (CTAB). Hence, the LaCoO 3 prepared with urea as surfactant has been used as an electroactive probe for the simultaneous electrochemical detection of DA, AA and UA. The final results clearly confirm the selective and sensitive detection of DA, AA and UA in real biological samples.

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A facile hydrothermal approach was employed to prepare diverse morphologies of LaMnO3 nanostructures. These nanostructures were used to modify the electrode for electrochemical detection of dopamine (DA) in the presence of excess ascorbic acid (AA) and uric acid (UA). The morphology was tuned by changing the concentration of ethylene glycol (EG) and the size and roughness was controlled by urea. The electrochemical behavior of glassy carbon electrode (GCE) modified with different morphologies of prepared LaMnO3 nanostructures was investigated by using cyclic voltammetry (CV). The results confirm the LaMnO3 nanostructure prepared with 10 mL of EG has strong electrocatalytic activity than other concentrations of EG. This electrode was further used as an electroactive probe for the electrochemical simultaneous detection of DA, AA and UA. The final results clearly confirm the GCE modified with LaMnO3 nanostructure can be successfully employed for the electrochemical simultaneous detection of DA, AA and UA in real biological samples.