Abstract
Greigite magnetic nanoparticles (Fe3S4-MNPs) were prepared and reveal a peroxidase-like activity. Kinetic studies revealed a pseudo-enzymatic activity that is much higher than that of other magnetic nanomaterial-based enzyme mimetics. This finding was exploited to design a photometric enzymatic glucose assay based on the formation of H2O2 during enzymatic oxidation of glucose by glucose oxidase, and the formation of a blue product from an enzyme substrate that is catalytically oxidized by H2O2 in the presence of Fe3S4-MNPs. Glucose can be detected in the 2 to 100 μM concentration range, and the low detection limit is 0.16 μM. The method was applied to quantify glucose in human serum. In our perception, this enzyme mimetic has a large potential in that it may be used in other oxidase based assays, but also in ELISAs.
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We acknowledge financial support from the National Natural Science Foundation of China (21175046, 21465010) and the Shanghai Natural Science Foundation (15ZR1411600).
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Ding, C., Yan, Y., Xiang, D. et al. Magnetic Fe3S4 nanoparticles with peroxidase-like activity, and their use in a photometric enzymatic glucose assay. Microchim Acta 183, 625–631 (2016). https://doi.org/10.1007/s00604-015-1690-6
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DOI: https://doi.org/10.1007/s00604-015-1690-6