Necip Atar, Mehmet Lütfi Yola and Tanju Eren
Department of Chemical Engineering, Pamukkale University, Denizli, Turkey
A sensitive imprinted electrochemical sensor based on platinum nanoparticles (PtNPs) and polyoxometalate (POM) decorated graphene quantum dots (GQDs) modified glassy carbon electrode (GCE) was developed for determination of citrinin (CIT) in rice. The POM was functionalized on GQDs through electrostatic interaction between POM and GQDs sheets to produce a photocatalyst (POM/GQDs) in aqueous media. Platinium nanoparticles were synthesized on POM/GQDs without any reducing agent and the prepared nanomaterial (PtNPs/POM/GQDs) was modified on GCE (PtNPs/ POM/GQDs/GCE) under infrared light. The prepared nanomaterials molecular imprinted polymers were characterized using scanning electron microscope (SEM), transmission electron microscope (TEM), x-ray photoelectron spectroscopy (XPS), reflection-absorption infrared spectroscopy (RAIRS), cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The imprinted electrochemical sensor was validated according to the International Conference on Harmonisation (ICH) guideline and found to be linear, sensitive, selective, precise and accurate. The developed electrochemical imprinted sensor showed high sensitivity and selectivity towards CIT. In particular, the developed imprinted electrochemical sensor offers the advantages of simplicity and efficiency in target detection from food samples. In addition, this novel detection method allow for further sensor developments.
Keywords: Biosensor, Molecular imprinting, Electrochemistry, Nanoparticle, Graphene, Citrinin.