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Multifunctional rare-earth self-assembled nanosystem for tri-modal upconversion luminescence /fluorescence /positron emission tomography imaging

Paper ID Volume ID Publish Year Pages File Format Full-Text
8013 573 2011 11 PDF Available
Title
Multifunctional rare-earth self-assembled nanosystem for tri-modal upconversion luminescence /fluorescence /positron emission tomography imaging
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, 1H-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.

Keywords
Upconversion nanoparticles; Alpha-cyclodextrin; Positron emission tomography (PET); Upconversion luminescence (UCL) imaging
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Multifunctional rare-earth self-assembled nanosystem for tri-modal upconversion luminescence /fluorescence /positron emission tomography imaging
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Publisher
Database: Elsevier - ScienceDirect
Journal: Biomaterials - Volume 32, Issue 32, November 2011, Pages 8243–8253
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us