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Abstract: A biosensor for determination of 3-chloro-1, 2-propandiol (3-MCPD) was developed based on the electrochemically catalytic reduction by hemoglobin (Hb). Hb was concentrated and immobilized with magnetic molecularly imprinted nanoparticles (MMIPs NPs). The MMIP NPs had a core-shell structure, with magnetic Fe3O4 NPs as the core and SiO2 as the shell. MMIPs NPs were modified on the surface of a magnetic electrode to constitute the Hb enzyme-like sensor. The biosensor could catalyze the electrochemical reduction of 3-MCPD, and a direct electrochemical determination of 3-MCPD could be achieved for the first time. The biosensor, where Hb immobilized with MMIPs NPs had high electrochemical response for 3-MCPD, increased by 37.5% compared with Hb immobilized with magnetic non-imprinted nanoparticle (MNIPs NPs). The biosensor increased the response by 19.56% again under an external magnetic field. The reduction peak current had a linear relationship with 3-MCPD concentration ranging from 1.0mg L-1 to 160mg L-1 with a detection limit (S/N=3) of 0.25mg L-1. The biosensor was applied to the determination of 3-MCPD in soy sauce samples successfully with recoveries between 97.4% and 99.6%
Template and target information: 3-chloro-1,2-propandiol, 3-MCPD
Author keywords: Magnetic molecularly imprinted nanoparticles, hemoglobin, 3-Chloro-1,2-propandiol, Electrochemical sensor, Magnetic electrode