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Synthesis and characterization of biofunctional quaternized xylan-Fe2O3 core/shell nanocomposites and modification
Jiliang Ma1, Dan Li2, Linxin Zhong1
1State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, 381 Wushan Road, Tianhe District, Guangzhou, 510641 PR China.
Abstract:
The aims of this study are to prepare quaternized xylan-Fe2O3 (QX-Fe2O3) core/shell nanocomposites and explore their potential application in the biomedical fields. γ-Fe2O3 nanoparticles synthesized by a facile solvothermal process are coated with QX via reverse microemulsion method and further modified by polylysine (PLL) and folic acid (FA) to prepare PLL-QX-Fe2O3 and FA-QX-Fe2O3 nanoparticles. An obvious strong absorption of γ-Fe2O3 at 580 cm-1 in the spectra of QX-Fe2O3 is observed, the Fe element content of QX-Fe2O3 is 30-75 μg/mL and the saturation magnetization of QX-Fe2O3 nanoparticles is 1.49 emu/g. The γ-Fe2O3 and QX-Fe2O3 nanoparticles are of regular sphericity with diameter of 50-100 nm and 60-150 nm, respectively. The highest zeta potential of QX-Fe2O3 nanoparticles is -41 mV, and the PLL-QX-Fe2O3 nanoparticles have a positive potential with a maximum value of 45.2 mV. In addition, FA-QX-Fe2O3 showed excellent performance in T2-weighted Magnetic Resonance (MR) imaging with an r2 value of 190 mM-1S-1. Each nanocomposite has its own inherent properties, which contributes to its versatile utilization and application potential.
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