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Long circulating tracer tailored for magnetic particle imaging.

Sitong Liu1, Andreina Chiu-Lam1, Angelie Rivera-Rodriguez2

  • 1Department of Chemical Engineering, University of Florida, Gainesville, FL 32611, USA.

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|April 14, 2021
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Summary

New superparamagnetic iron oxide nanoparticle (SPION) tracers were developed for magnetic particle imaging (MPI). These tailored SPIONs show significantly improved MPI sensitivity and longer blood circulation times compared to commercial tracers.

Keywords:
iron oxide nanoparticleslong circulating tracermagnetic particle imaging

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Area of Science:

  • Nanotechnology
  • Biomedical Imaging
  • Materials Science

Background:

  • Superparamagnetic iron oxide nanoparticles (SPIONs) are essential for magnetic particle imaging (MPI).
  • Developing SPION tracers with enhanced blood circulation and MPI performance is critical for advancing MPI as a molecular imaging technique.
  • Current commercial SPIONs often lack optimal characteristics for advanced MPI applications.

Purpose of the Study:

  • To synthesize and characterize novel single-core SPION tracers with covalently bonded polyethylene glycol (PEG) brushes.
  • To evaluate the physical, magnetic, and in vivo properties of these tailored SPIONs.
  • To compare the performance of the new SPION tracers against commercially available SPIONs (ferucarbotran and PEG-coated Synomag®-D) for MPI applications.

Main Methods:

  • Semi-batch thermal decomposition synthesis with controlled oxygen addition.
  • Optimized PEG-silane ligand exchange for SPION surface functionalization.
  • Comparative analysis of physical properties, magnetic characteristics, MPI sensitivity, and blood circulation half-life.

Main Results:

  • The newly synthesized SPION tracers exhibit significantly improved MPI sensitivity, approximately 3-times higher than ferucarbotran.
  • The tailored SPIONs demonstrate substantially longer blood circulation half-lives (t1/2 = 6.99 h) compared to commercial tracers (ferucarbotran: t1/2 = 0.59 h; PEG-coated Synomag®-D: t1/2 = 0.62 h).
  • The developed tracers possess properties optimized for enhanced MPI performance and extended in vivo presence.

Conclusions:

  • Tailored single-core SPIONs with PEG brushes offer superior MPI sensitivity and prolonged circulation.
  • These findings highlight the potential of specifically designed SPIONs for improving MPI efficacy in molecular imaging.
  • The developed tracers represent a significant advancement over existing commercial SPIONs for MPI applications.