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Updated: Aug 18, 2026

Using Magnetometry to Monitor Cellular Incorporation and Subsequent Biodegradation of Chemically Synthetized Iron Oxide Nanoparticles
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Using Magnetometry to Monitor Cellular Incorporation and Subsequent Biodegradation of Chemically Synthetized Iron Oxide Nanoparticles

Published on: February 27, 2021

[Behavior of magnetic particles of metallic iron in animals]

M M Shabarchina, A I Tsapin, A G Malenkov

    Biofizika
    |November 1, 1990
    PubMed

    Insights

    Ferromagnetic iron particles (5-8 µm) introduced intraperitoneally are encapsulated in the mouse liver for over a month, increasing lipid oxidation. Smaller particles (<1 µm) caused rapid death, highlighting size-dependent toxicity.

    Area of Science:

    • Biomedical Engineering
    • Materials Science
    • Toxicology

    Context:

    • Investigating the biological fate and effects of ferromagnetic iron particles.
    • Understanding the interaction between engineered nanomaterials and biological systems.
    • Assessing the impact of particle size on in vivo behavior and toxicity.

    Purpose:

    • To characterize the biodistribution, persistence, and physiological effects of intraperitoneally administered ferromagnetic iron particles in mice.
    • To evaluate the acute toxicity of smaller ferromagnetic particles (<1 µm).
    • To examine the in vivo transformation and clearance of larger ferromagnetic particles (5-8 µm) in rats following intravenous injection.

    Summary:

    • Intraperitoneal administration of 5-8 µm ferromagnetic iron particles in mice resulted in hepatic encapsulation and persistence for over one month, accompanied by increased lipid peroxidation and free iron content within 3-4 days.
    • Conversely, intraperitoneal introduction of ferromagnetic particles with diameters below 1 µm led to rapid mortality, indicating significant size-dependent toxicity.
    • Intravenous injection of 5-8 µm particles into rats caused accumulation in the liver, lung, and spleen, likely via macrophage phagocytosis, with subsequent transformation and clearance within two weeks.

    Impact:

    • This study elucidates the critical role of particle size in the in vivo behavior and toxicity of ferromagnetic iron particles.
    • Findings provide crucial data for the safe design and application of iron-based nanoparticles in biomedical research and therapeutics.
    • Highlights the potential for macrophage-mediated clearance and transformation of iron particles, informing future nanomedicine strategies.

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