Metallic iron nanoparticles for MRI contrast enhancement and local hyperthermia.
Metallic iron nanoparticles for MRI contrast enhancement and local hyperthermia.
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DOI:
10.1002/smll.200800261
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发表时间:
2008-11
期刊:
影响因子:
13.3
通讯作者:
Hadjipanayis, George C.
中科院分区:
文献类型:
--
作者:
Hacliipanayis, Coslas G.;Bonder, Michael J.;Balakrishanan, Srinivasan;Wang, Xiaoxia;Mao, Huio;Hadjipanayis, George C.
Current magnetic-nanoparticle technology is challenging due to the limited magnetic properties of iron oxide nanoparticles (IONPs). Increasing the saturation magnetization of magnetic nanoparticles may permit more effective development of multifunctional agents for simultaneous targeted cell delivery, magnetic resonance imaging (MRI) contrast enhancement, and targeted cancer therapy in the form of local hyperthermia. We describe the synthesis and characterization of novel iron-based nanoparticles (FeNPs) coated with biocompatible biscarboxyl-terminated poly (ethylene glycol)(cPEG). In comparison to conventional IONPs similar in size (10 nm), FeNPs particles have a much greater magnetization and coercivity based on hysteresis loops from sample magnetometry. Increased magnetization afforded by the FeNPs permits more effective generation of local hyperthermia than IONPs when subjected to an oscillating magnetic field in a safe frequency range. Furthermore, FeNPs have a much stronger shortening effect on T2 relaxation time than IONPs, suggesting that FeNPs may be more effective MRI contrast agents. Next-generation FeNPs with a biocompatible coating may
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