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Determining the Relaxivity Values of Protein Cage-Templated Nanoparticles Using Magnetic Resonance Imaging

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Protein Cages

Part of the book series: Methods in Molecular Biology ((MIMB,volume 1252))

Abstract

The application of magnetic resonance imaging (MRI) is often limited by low magnetic relaxivity of currently used contrast agents. This problem can be addressed by developing more sensitive contrast agents by synthesizing new types of metal complex or metallic nanoparticles. Protein cage has been used as a template in biological synthesis of magnetic nanoparticles. The magnetic nanoparticle-protein cage composites have been reported to have high magnetic relaxivity, which implies their potential application as an MRI contrast agent. The magnetic relaxivity is determined by measuring longitudinal and transverse magnetic relaxivities of the potential agent. The commonly performed techniques are field-cycling NMR relaxometry (also known as variable field relaxometry or nuclear magnetic relaxation dispersion (NMRD) profiling) and in vitro or in vivo MRI relaxometry. Here, we describe techniques for the synthesis of nanoparticle-protein cage composite and determination of their magnetic relaxivities by in vitro MR image acquisition and data processing. In this method, longitudinal and transverse relaxivities are calculated by measuring relaxation rates of water hydrogen nuclei at different nanoparticle-protein cage composite concentrations.

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Acknowledgment

The authors thank Dr. Cher Heng Tan at Tan Tock Seng Hospital, Singapore, for technical advices on magnetic resonance imaging. The work is supported by Singapore National Medical Research Council New Investigator Grant (NMRC/NIG/1073/2012)

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Authors and Affiliations

  1. School of Chemical and Biomedical Engineering, Nanyang Technological University, 70 Nanyang Dr., Block N1.3, Singapore, 637457, Singapore

    Barindra Sana & Sierin Lim

Authors
  1. Barindra Sana
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  2. Sierin Lim
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Corresponding author

Correspondence to Sierin Lim .

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Editors and Affiliations

  1. Department of Chemistry, King's College London, London, United Kingdom

    Brendan P. Orner

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Sana, B., Lim, S. (2015). Determining the Relaxivity Values of Protein Cage-Templated Nanoparticles Using Magnetic Resonance Imaging. In: Orner, B. (eds) Protein Cages. Methods in Molecular Biology, vol 1252. Humana Press, New York, NY. https://doi.org/10.1007/978-1-4939-2131-7_4

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  • DOI: https://doi.org/10.1007/978-1-4939-2131-7_4

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  • Publisher Name: Humana Press, New York, NY

  • Print ISBN: 978-1-4939-2130-0

  • Online ISBN: 978-1-4939-2131-7

  • eBook Packages: Springer Protocols

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