A novel electrochemical sensor based on molecularly imprinted polymers for caffeine recognition and detection

摘要: A sensitive and selective electrochemical sensor based on molecularly imprinted polymers (MIPs) was developed for caffeine (CAF) recognition detection. The constructed through the following steps: multiwalled carbon nanotubes gold nanoparticles were first modified onto glassy electrode surface by potentiostatic deposition method successively. Subsequently, o-aminothiophenol (ATP) assembled of above Au–S bond before electropolymerization. During electropolymerization processes, CAF embedded into poly(o-aminothiophenol) film hydrogen bonding interaction between ATP, forming an MIP sensor. morphologies properties characterized scanning electron microscopy, cyclic voltammetry, differential pulse voltammetry. determination observed measuring changes amperometric response oxidation-reduction probe, [Fe(CN)6]3−/[Fe(CN)6]4−, electrode. results demonstrated that prepared had excellent selectivity high sensitivity CAF, linear range 5.0 × 10−10 ~ 1.6 10−7 mol L−1 with a detection limit 9.0 10−11 (S/N = 3). also successfully employed to detect in tea samples.