Publication Type Journal Article
Title Core-shell superparamagnetic nanoparticles with interesting properties as contrast agents for MRI
Authors A. Carvalho I. Domingues M. Clara Gonçalves
Groups
Journal MATERIALS CHEMISTRY AND PHYSICS
Year 2015
Month November
Volume 168
Number
Pages 42-49
Abstract Core shell nanoparticles (NPs) formed by superparamagnetic iron oxide NPs (SPIONs) coated with inorganic or organically modified (ORMOSIL) sol gel silica exhibited promising properties as negative contrast agents (CA) for MRI applications. The potentiality of these new core shell NPs as negative CA for MRI is demonstrated and quantified. The longitudinal and transverse relaxivities of NPs with three different coating compositions were studied at a 7 T magnetic field: silica (TEOS), (3-aminopropyl) triethoxysilane (APTES) and (3-glycidoxypropyl) methyldiethoxysilane (GPTMS). Clearly, it was found that the core shell NPs efficiency as CA was strongly depend on the SPIONs coating. All the three core shell NPs studied presented a very small effect on the longitudinal relaxation time but a pronounced one on the transverse relaxation time, leading to a very high transverse longitudinal relaxivities ratio, decisive for their efficiency as negative CA for MRI The effect of the core shell NPs on the MRI contrast enhancement is obtained and quantified in a set of MRI of agar phantoms obtained at 7 T magnetic field and with a imaging gradient field of 1.6 T/m. The core shell NPs were tested in Zebra-fish (Danio rerio) animal model. Zebra-fish MRI were obtained with animals injected with the three core shell NPs and the contrast enhancement validated. (C) 2015 Elsevier B.V. All rights reserved.
DOI http://dx.doi.org/10.1016/j.matchemphys.2015.10.030
ISBN
Publisher ELSEVIER SCIENCE SA
Book Title
ISSN 0254-0584
EISSN 1879-3312
Conference Name
Bibtex ID ISI:000367493000007
Observations
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