Abstract:
:Rare-earth upconversion nanoparticles (UCNP) which can absorb low-energy photons and emit high energy photons have attracted great interest not only because of their unique application in upconversion luminescence imaging, but also because they can be used as ideal building blocks for multimodal bioimaging probes. Improving the water-solubility of UCNP and functionalizing them are as yet unresolved problems. In this present study, a general strategy was developed to achieve these two aims by converting hydrophobic upconversion nanoparticles into hydrophilic ones. This was based on the self-assembly between oleic acid, which is a capping ligand, as the guest molecule, and alpha-cyclodextrin, as the host molecule, no matter what the particle size was (10-400 nm) or what synthesis method (thermal decomposition, hydrothermal, solvothermal) was used. The synthesized hydrophilic nanoparticles can further load hydrophobic molecule, e.g. Os(II) complex. The process of self-assembly and loading was confirmed by transmission electron microscopy, X-ray powder diffraction, (1)H-nuclear magnetic resonance, Fourier transform-infrared and thermogravimetric analysis, upconversion luminescence and fluorescence spectra. Further bioapplication has also been investigated, including cell-labeling, in vivo lymphatic imaging, upconversion luminescence and positron emission tomography imaging of whole-body Kunming mice. The results indicate that this method is a potential candidate for the preparation of hydrophilic UCNP as a multimodal nanoprobe.
journal_name
Biomaterialsjournal_title
Biomaterialsauthors
Liu Q,Chen M,Sun Y,Chen G,Yang T,Gao Y,Zhang X,Li Fdoi
10.1016/j.biomaterials.2011.07.053subject
Has Abstractpub_date
2011-11-01 00:00:00pages
8243-53issue
32eissn
0142-9612issn
1878-5905pii
S0142-9612(11)00836-2journal_volume
32pub_type
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