Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 10, Issue 36, Pages 30441-30450Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b10968
Keywords
organic/inorganic hybrid nanoflower; hemoglobin; biosensor; fluorescent; colorimetric; H2O2
Funding
- National Science Foundation of China [51272147]
- Natural Science Foundation of Shaanxi Province [2015JM5208, 2018JQ2069]
- Foundation for Young Scholars of Shaanxi University of Science Technology [2017BJ-06]
- Graduate Innovation Found of Shaanxi University of Science Technology
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In this article, the three-dimensional hemoglobin (Hb)-Cu-3(PO4)(2) organic/inorganic hybrid nanoflowers (Hb-Cu-3(PO4)(2) HNFs) self-assembled by nanopetals were synthesized via a facile one-pot green synthetic method. The compositions and microstructure of the Hb-Cu-3(PO4)(2) HNFs were well-characterized with X-ray diffraction, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy, and UV-vis spectrometry, respectively. The as prepared Hb-Cu-3(PO4)(2) HNFs were to be used as a biocatalyst to construct colorimetric/fluorescent dual biosensors. The experimental results show that the colorimetric/fluorescent dual biosensors exhibited two linear responses in the range of 2-10 ppb and 20-100 ppb for H2O2. The colorimetric and fluorescent detection limits were 0.1 and 0.01 ppb, respectively. Compared with the free Hb, the biocatalytic activity of the Hb-Cu-3(PO4)(2) HNFs can be improved for 3-4 times under optimal conditions. The sensing performance of these Hb-Cu-3(PO4)(2) HNF-based dual biosensors can be contributed such that the active sites of Hb molecules were more exposed on the surface of the Cu-3(PO4)(2) nanopetals. Second, the unique nanopetal-assembled hybrid flowerlike structure was favorable to contact the detected substance with the biosensors. The dual biosensors were successfully applied for the determination of H2O2 in rainwater, tap water, and waste water samples. These results show that the dual biosensors had a potential application in the field of medical analysis, environmental monitoring, and food engineering.
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