Abstract
Acylated xylan-based magnetic Fe3O4 nanocomposite hydrogels (ACX-MNP-gels) were prepared by fabricating Fe3O4 nanoctahedra in situ within a hydrogel matrix which was synthesized by the copolymerization of acylated xylan (ACX) with acrylamide and N-isopropylacrylamide under ultraviolet irradiation. The size of the Fe3O4 fabricated within the hydrogel matrix could be adjusted through controlling the crosslinking concentrations (C). The magnetic hydrogels showed desirable magnetic and mechanical properties, which were confirmed by XRD, Raman spectroscopy, physical property measurement system, SEM, TGA, and compression test. Moreover, the catalytic performance of the magnetic hydrogels was explored. The magnetic hydrogels (C = 7.5 wt %) presented excellent catalytic activity and provided a sensitive response to H2O2 detection even at a concentration level of 5 × 10−6 mol·L−1. This approach to preparing magnetic hydrogels loaded with Fe3O4 nanoparticles endows xylan-based hydrogels with new promising applications in biotechnology and environmental chemistry.
Highlights
Hydrogels possessing three-dimensional networks can absorb enormous amounts of biological fluids or water but still keep their structural integrity [1], which provides a liquid-like microenvironment where small molecules can diffuse and be transported
H2 O2 catalysis can be employed for the trace detection of H2 O2 released from cells or produced by glucose oxidation, which is important for human health and disease [12,13]
In this study, modified xylan based hydrogels possessing magnetic properties were designed by fabricating Fe3 O4 nanoctahedra in situ within a hydrogel matrix which was synthesized by the copolymerization of acryloyl chloride modified xylan (ACX) with acrylamide and
Summary
Hydrogels possessing three-dimensional networks can absorb enormous amounts of biological fluids or water but still keep their structural integrity [1], which provides a liquid-like microenvironment where small molecules can diffuse and be transported. It was reported that magnetite nanoparticles could be widely used to oxidize organic substrates in the treatment of wastewater, or used as detection tools instead of natural peroxidases, because of their intrinsic enzyme mimetic activity [10]. Designed a novel xylan-based hydrogel which showed good photo-responsive properties by free radical copolymerization. Multi-responsive hydrogels were designed by copolymerizing glycidyl methacrylate (GMA)-modified xylan-type hemicellulose with. Few comparative studies have been conducted on the preparation and characterization of acylated xylan-based hydrogels with magnetic-response behavior as well as their catalytic activity toward the detection of H2 O2. In this study, modified xylan based hydrogels possessing magnetic properties were designed by fabricating Fe3 O4 nanoctahedra in situ within a hydrogel matrix which was synthesized by the copolymerization of acryloyl chloride modified xylan (ACX) with acrylamide and. The as-prepared magnetic hydrogels were used to catalyze the oxidation of a peroxidase substrate (3,30 ,5,50 -tetramethylbenzidine, TMB) (10 mL) by H2 O2 to yield the oxidized colored product which provided a colorimetric detection of H2 O2
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