Journal
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
Volume 834, Issue -, Pages 233-240Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jelechem.2018.12.034
Keywords
Magnetic molecularly imprinted nanoparticles; Hemoglobin; 3-Chloro-1, 2-propandiol; Electrochemical sensor; Magnetic electrode
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Funding
- Independent Scientific Research Plan of Jiangnan University [JUSRP116023]
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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 1.0 mg.L-1 to 160 mg.L-1 with a detection limit (S/N = 3) of 0.25 mg.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%.
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