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Issue 38, 2013
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Toward theranostic nanoparticles: CB[7]-functionalized iron oxide for drug delivery and MRI

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Abstract

Iron oxide (γ-Fe2O3) nanoparticles (NPs) were efficiently coated with the water soluble macrocycle cucurbit[7]uril (CB[7]) by microwave heating. Density functional theory (DFT) calculations support a binding model in which the carbonyl oxygens of CB[7] coordinate directly to surface Fe3+ ions. The modified particles (CB[7]NPs) are stable under a wide pH range (2–12) and have a transverse relaxivity, R2, of 113 s−1 mM−1. Nile red (NR) dye was loaded into the cavities of the surface-adsorbed CB[7]s, and intracellular delivery of the dye to HCT116 cells was observed by confocal laser scanning microscopy. The dye-loaded particles (CB[7]NPs⊃NR) have a R2 of 172 s−1 mM−1. The stability, biocompatibility, and dual purpose functionality (drug delivery and magnetic resonance imaging) of the CB[7]NPs herald the theranostic potential of this system.

Graphical abstract: Toward theranostic nanoparticles: CB[7]-functionalized iron oxide for drug delivery and MRI

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Supplementary files

Article information


Submitted
14 Jun 2013
Accepted
29 Jul 2013
First published
06 Aug 2013

J. Mater. Chem. B, 2013,1, 5076-5082
Article type
Paper

Toward theranostic nanoparticles: CB[7]-functionalized iron oxide for drug delivery and MRI

F. Benyettou, I. Milosevic, Y. Lalatonne, F. Warmont, R. Assah, J. Olsen, M. Jouaid, L. Motte, C. Platas-Iglesias and A. Trabolsi, J. Mater. Chem. B, 2013, 1, 5076 DOI: 10.1039/C3TB20852D

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