Aluminium hydroxide stabilised MnFe2O4 and Fe3O4 nanoparticles as dual-modality contrasts agent for MRI and PET imaging

Xianjin Cui, Salome Belo, Dirk Krüger, Yong Yan, Rafael T.M. de Rosales, Maite Jauregui-Osoro, Haitao Ye, Shi Su, Domokos Mathe, Noémi Kovács, Ildikó Horváth, Mariann Semjeni, Kavitha Sunassee, Krisztian Szigeti, Mark A. Green, Philip J. Blower

    Research output: Contribution to journalArticlepeer-review


    Magnetic nanoparticles (NPs) MnFe2O4 and Fe3O4 were stabilised by depositing an Al(OH)3 layer via a hydrolysis process. The particles displayed excellent colloidal stability in water and a high affinity to [18F]-fluoride and bisphosphonate groups. A high radiolabeling efficiency, 97% for 18F-fluoride and 100% for 64Cu-bisphosphonate conjugate, was achieved by simply incubating NPs with radioactivity solution at room temperature for 5min. The properties of particles were strongly dependant on the thickness and hardness of the Al(OH)3 layer which could in turn be controlled by the hydrolysis method. The application of these Al(OH)3 coated magnetic NPs in molecular imaging has been further explored. The results demonstrated that these NPs are potential candidates as dual modal probes for MR and PET. In vivo PET imaging showed a slow release of 18F from NPs, but no sign of efflux of 64Cu.

    Original languageEnglish
    Pages (from-to)5840-5846
    Number of pages7
    Issue number22
    Early online date24 Apr 2014
    Publication statusPublished - 1 Jul 2014

    Bibliographical note

    Creative Commons Attribution 3.0 Unported (CC BY 3.0)

    Open Access funded by Wellcome Trust.
    Funding: Centre of Excellence in Medical Engineering funded by the Wellcome Trust; EPSRC under grant number WT088641/Z/09/Z and WT088641/Z/09/Z (in association with the MRC); King’s College London; UCL Comprehensive Cancer Imaging Centre funded by the CRUK (C1519/A10331); and National Institute for Health Research Biomedical Research Centre at Guy’s and St Thomas’ NHS Foundation Trust and King’ s College London. The scanning equipment funded by an equipment grant from the Wellcome Trust.

    Supplementary data: http://


    • magnetic nanoparticles
    • PET
    • aluminium hydroxide
    • dual-modal
    • 18F


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