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Related Experiment Video

Updated: Jun 20, 2026

Registered Bioimaging of Nanomaterials for Diagnostic and Therapeutic Monitoring
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Registered Bioimaging of Nanomaterials for Diagnostic and Therapeutic Monitoring

Published on: December 9, 2010

Superparamagnetic magnetite nanocrystal clusters: a sensitive tool for MR cellular imaging.

Fenghua Xu1, Changming Cheng, Fangjie Xu

  • 1Med-X Research Institute, Shanghai Jiao Tong University, Shanghai 200030, People's Republic of China.

Nanotechnology
|September 16, 2009
PubMed
Summary

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Superparamagnetic magnetite nanocrystal clusters (SMNC) show high MRI sensitivity for cell imaging. These novel nanomaterials effectively label cells without toxicity, enabling detection of low cell concentrations.

Area of Science:

  • Nanotechnology
  • Biomedical Imaging
  • Materials Science

Background:

  • Developing sensitive contrast agents for Magnetic Resonance (MR) imaging is crucial for early disease detection.
  • Superparamagnetic iron oxide nanoparticles (SPIONs) are promising for MR imaging, but their sensitivity and cell compatibility require optimization.

Purpose of the Study:

  • To synthesize and characterize silica coated, PEI and citric acid hybrid superparamagnetic magnetite nanocrystal clusters (SMNC).
  • To evaluate the MR detection sensitivity and cell labeling capabilities of these SMNC for biomedical applications.

Main Methods:

  • SMNC were synthesized using mini-emulsion/sol-gel or polyol methods.
  • Characterization included TEM, charge analysis, and relaxometry measurements.
  • Cell labeling experiments were performed on RAW264.7 cells, followed by MR imaging at 3 T.

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Last Updated: Jun 20, 2026

Registered Bioimaging of Nanomaterials for Diagnostic and Therapeutic Monitoring
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Main Results:

  • SMNC, approximately 200 nm in size, exhibited high MR sensitivity, particularly citric acid SMNC (r(2) = 360 s(-1) mM(-1)).
  • Labeled cells showed no adverse effects on viability and exhibited dose- and time-dependent uptake.
  • MR imaging detected as few as 10 x 10(3) cells ml(-1) using silica SMNC.

Conclusions:

  • Synthesized SMNC are highly sensitive MR contrast agents.
  • SMNC are effective and non-toxic tools for cell labeling and MR imaging.
  • This technology enables sensitive detection of low cell concentrations, advancing cell-based diagnostics.