King, Aaron M., Bray, Caroline, Hall, Stephen C. L., Bear, Joseph C., Bogart, Lara K., Perrier, Sébastien and Davies, Gemma-Louise (2020) Exploring precision polymers to fine-tune magnetic resonance imaging properties of iron oxide nanoparticles. Journal of Colloid and Interface Science, 579 . pp. 401-411. doi:10.1016/j.jcis.2020.06.036

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Abstract

The use of bio-polymers as stabilising agents for iron oxide-based negative magnetic resonance imaging (MRI) contrast agents has become popular in recent years, however the wide polydispersity of biologically-derived and commercially available polymers limits the ability to produce truly tuneable and reproducible behaviour, a major challenge in this area. In this work, stable colloids of iron oxide nanoparticles were prepared utilising precision-engineered bio-polymer mimics, poly(2-acrylamido-2-methylpropane sodium sulfonate) (P(AMPS)) polymers, with controlled narrow polydispersity molecular weights, as templating stabilisers. In addition to producing magnetic colloids with excellent MRI contrast capabilities (r values reaching 434.2 mM  s at 25 °C and 23 MHz, several times higher than similar commercial analogues), variable field relaxometry provided unexpected important insights into the dynamic environment of the hydrated materials, and hence their exceptional MRI behaviour. Thanks to the polymer's templating backbone and flexible conformation in aqueous suspension, nanocomposites appear to behave as "multi-core" clustered species, enhancing interparticle interactions whilst retaining water diffusion, boosting relaxation properties at low frequency. This clustering behaviour, evidenced by small-angle X-ray scattering, and strong relaxometric response, was fine-tuned using the well-defined molecular weight polymer species with precise iron to polymer ratios. By also showing negligible haemolytic activity, these nanocomposites exhibit considerable potential for MRI diagnostics. [Abstract copyright: Crown Copyright © 2020. Published by Elsevier Inc. All rights reserved.]

Item Type:	Journal Article
Subjects:	Q Science > QC Physics Q Science > QD Chemistry Q Science > QP Physiology
Divisions:	Faculty of Science > Chemistry
SWORD Depositor:	Library Publications Router
Library of Congress Subject Headings (LCSH):	Polymers, Biopolymers, Magnetic resonance imaging, Magnetic particle imaging, Iron oxides
Journal or Publication Title:	Journal of Colloid and Interface Science
Publisher:	Academic Press Inc. Elsivier Science
ISSN:	0021-9797
Official Date:	1 November 2020
Dates:	Date Event 1 November 2020 Published 10 June 2020 Available 7 June 2020 Accepted
Date of first compliant deposit:	4 August 2020
Volume:	579
Page Range:	pp. 401-411
DOI:	10.1016/j.jcis.2020.06.036
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
RIOXX Funder/Project Grant:	Project/Grant ID RIOXX Funder Name Funder ID EP/N509577/1 [EPSRC] Engineering and Physical Sciences Research Council http://dx.doi.org/10.13039/501100000266 DMR-0520547 National Science Foundation http://dx.doi.org/10.13039/501100008982 654000 European Commission http://dx.doi.org/10.13039/501100000780

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