Electrochemical Sensor Based on Molecularly Imprinted Polymer Film Prepared with Functional Abietic-Type Acids as Cross-Linker for the Determination of Quinine

A novel cross-linker (functional abietic-type acids) for preparing highly sensitive, molecularly imprinted sensors was proposed for quinine determination. A MIP film was created on a glassy carbon electrode for determination of quinine using free radical polymerization method. The modification procedure was characterized via electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV). The interaction between functional monomer and target molecule was observed by UV spectrometric methods. Under the optimal experimental conditions, the peak currents were proportional to the concentrations of quinine in the range from 8.0x10-7 to 2.6x10-4 M with a detection limit of 2.0x10-8 M. Meanwhile the prepared sensor showed sensitive and selective binding sites for quinine. Determination of quinine in tonic water showed good recovery.