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Updated: Jun 6, 2026
Preparation, Purification, and Characterization of Lanthanide Complexes for Use as Contrast Agents for Magnetic Resonance Imaging
Published on: July 21, 2011
Production of magnetic multilamellar liposomes as highly T2-efficient MRI contrast agents
Marie-Edith Meyre1, Gérard Raffard, Jean-Michel Franconi
1Centre de Recherche Paul Pascal (CNRS, UPR8641) - Université Bordeaux, Pessac, France.
Abstract:
Lipid-based multilamellar vesicles loaded with aminosilane-modified maghemite nanoparticles (a-MNPs), also called magnetonions (MO), were analyzed for their magnetic resonance imaging (MRI) contrast agent properties. They were shown to be better T(2)-MRI contrast agents than commercial contrast agents and other reported liposome-based contrast agents as shown by their higher value of relaxivity ratio (r(2)/r(1) = 17), although a lower magnetic field intensity was used (0.2 T). Their high efficiency was explained by the aggregation of a-MNPs in between multilamellar vesicles, bilayers induced by MO preparation, and evidenced by cryo-TEM imaging. Magnetonions are then a promising platform for diagnosis and therapy.
From The Clinical Editor:
In this study, magnetonions (MO) are presented as a very potent T2 relaxation enhancing MRI contrast agents. Such agents may be used in cell labeling and molecular imaging applications.
Insights
Magnetonions, lipid-based vesicles with magnetic nanoparticles, show superior T2-MRI contrast enhancement. These novel agents offer improved diagnostic potential for cell labeling and molecular imaging applications.
Area of Science:
- Nanotechnology
- Biomedical Imaging
- Materials Science
Background:
- Lipid-based multilamellar vesicles loaded with aminosilane-modified maghemite nanoparticles (a-MNPs), termed magnetonions (MO), were investigated.
- Magnetonions are presented as potent T2 relaxation enhancing MRI contrast agents.
- Potential applications include cell labeling and molecular imaging.
Purpose of the Study:
- To evaluate the MRI contrast agent properties of magnetonions (MO).
- To compare their efficacy against commercial contrast agents and other liposome-based agents.
Main Methods:
- Preparation of magnetonions (MO) by loading lipid-based multilamellar vesicles with aminosilane-modified maghemite nanoparticles (a-MNPs).
- Analysis of MRI contrast agent properties, including relaxivity ratio (r(2)/r(1)).
- Cryo-transmission electron microscopy (cryo-TEM) imaging to visualize nanoparticle aggregation.
Main Results:
- Magnetonions demonstrated superior T2-MRI contrast enhancement compared to commercial agents.
- A high relaxivity ratio (r(2)/r(1) = 17) was achieved even at a low magnetic field intensity (0.2 T).
- Cryo-TEM imaging confirmed the aggregation of a-MNPs within the multilamellar vesicles, explaining their high efficiency.
Conclusions:
- Magnetonions represent a promising platform for MRI contrast agents.
- Their unique structure facilitates efficient T2 relaxation enhancement.
- Magnetonions hold potential for advanced diagnostic and therapeutic applications.
