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Water-Dispersible Ferrimagnetic Iron Oxide Nanocubes with Extremely High r2 Relaxivity for Highly Sensitive in Vivo MRI of Tumors
Abstract
The theoretically predicted maximum r(2) relaxivity of iron oxide nanoparticles was achieved by optimizing the overall size of ferrimagnetic iron oxide nanocubes. Uniform-sized iron oxide nanocubes with an edge length of 22 nm, encapsulated with PEG-phospholipids (WFION), exhibited high colloidal stability in aqueous media. In addition, WFIONs are biocompatible and did not affect cell viability at concentrations up to 0.75 mg Fe/ml. Owing to the enhanced colloidal stability and the high r(2) relaxivity (761 mM(-1) s(-1)), it was possible to successfully perform in vivo MR imaging of tumors by intravenous injection of 22-nm-sized WFIONs, using a clinical 3-T MR scanner.
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Metadata
- Authors
- Lee, N., Choi, Y., Lee, Y., Park, M., Moon, W. K., Choi, S. H., & Hyeon, T.
- Venue
- Nano Letters
- Publisher
- American Chemical Society (ACS)
- Published
- 2012-05-14
- Volume
- 12
- Issue
- 6
- Pages
- 3127-3131
- ISSN
- 1530-6984 (ISSN-L)
- 1530-6992
- OpenAlex
- W2326155974
- Cited by
- 293
- References
- 47
- FWCI
- 16.57
- Type
- journal article
- Language
- en
- Open access
- closed
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