V_c-Functionalized Fe₃O₄ Nanocomposites as Peroxidase-like Mimetics for H₂O₂ and Glucose Sensing

Abstract

A simple and efficient colorimetric biosensing for hydrogen peroxide and glucose with peroxidase-like vitamin C(V_c) functionalized Fe₃O₄ magnetic nanoparticles(V_cFe₃O₄ MNPs) as a catalyst is reported. Compared with Fe₃O₄ MNPs and other catalysts, V_cFe₃O₄ MNPs exhibited superior catalytic properties. Kinetic studies indicated that vitamin C incorporated on Fe₃O₄ MNPs improved the affinity toward H₂O₂. As low as 0.29 μmol/L H₂O₂ can be detected with a wide linear range of 0.5―100 μmol/L H₂O₂; moreover, as low as 0.288 μmol/L glucose can be detected with a linear range of 0.5―25 μmol/L glucose. The detection method was highly sensitive in sensing H₂O₂ and glucose. The robustness of V_cFe₃O₄ MNPs rendered them suitable for wide ranging applications.

Keywords

V_cFe₃O₄ / Colorimetric biosensing / Enzyme mimetics / Hydrogen peroxide / Glucose

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