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Magnetic Nanoparticles-Embedded Enzyme-Inorganic Hybrid Nanoflowers with Enhanced Peroxidase-Like Activity and Substrate Channeling for Glucose Biosensing

Authors
Cheon, Hong JaeAdhikari, Manab DebChung, MinsooTran, Tai DucKim, JungbaeKim, Moon Il
Issue Date
5월-2019
Publisher
WILEY
Keywords
enzyme-inorganic hybrid nanoflowers; glucose detection; magnetic nanoparticles; peroxidase-like activity; substrate channeling
Citation
ADVANCED HEALTHCARE MATERIALS, v.8, no.9
Indexed
SCIE
SCOPUS
Journal Title
ADVANCED HEALTHCARE MATERIALS
Volume
8
Number
9
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/65882
DOI
10.1002/adhm.201801507
ISSN
2192-2640
Abstract
It is reported that glucose oxidase (GOx)-copper hybrid nanoflowers embedded with Fe3O4 magnetic nanoparticles (MNPs) exhibit superior peroxidase-mimicking activity as well as substrate channeling for glucose detection. This is due to the synergistic integration of GOx, crystalline copper phosphates and MNPs being in close proximity within the nanoflowers. The preparation of MNP-embedded GOx-copper hybrid nanoflowers (MNPs-GOx NFs) begins with the facile conjugation of amine-functionalized MNPs with GOx molecules via electrostatic attraction, followed by the addition of copper sulfate that leads to full blooming of the hybrid nanoflowers. In the presence of glucose, the catalytic action of GOx entrapped in the nanoflowers generates H2O2, which is subsequently used by peroxidase-mimicking MNPs and copper phosphate crystals, located close to GOx molecules, to convert Amplex UltraRed substrate into a highly fluorescent product. Using this strategy, the target glucose is successfully determined with excellent selectivity, stability, and magnetic reusability. This biosensor based on hybrid nanoflowers also exhibits a high degree of precision and reproducibility when applied to real human blood samples. Such novel MNP-embedded enzyme-inorganic hybrid nanoflowers have a great potential to be expanded to any oxidases, which will be highly beneficial for the detection of various other clinically important target molecules.
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공과대학 (화공생명공학과)
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