Easy preparation of an MRI contrast agent with high longitudinal relaxivity based on gadolinium ions-loaded graphene oxide

Easy preparation of an MRI contrast agent with high longitudinal relaxivity based on gadolinium ions-loaded graphene oxide
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基于钆离子负载氧化石墨烯轻松制备具有高纵向弛豫率的MRI造影剂

DOI:
10.1039/c4ra09073j
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发表时间:
2014-10
期刊:
影响因子:
3.9
通讯作者:
Li, Yu
Li, Yu
中科院分区:
化学3区
文献类型:
--
作者:
Liu, Lihua;Guo, Liping;Zhang, Ming;Li, Yu

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就纵向弛豫率(r1)而言,由传统载体修饰的钆离子(Gd 3+)基MRI造影剂似乎并不远上级临床使用的Magenvist。本研究以羧基化的氧化石墨烯(CGO)为纳米载体,直接与GdCl 3·6 H2O作用,制备了一种具有高r1值的MRI造影剂(Gd 3 +@CGO)。在CGO上负载2.8wt%的Gd 3+时,所制备的Gd 3 +@CGO在水中显示出良好的分散性,并且具有63.8mM −1 S−1的r1,这是Magenvist的r1的14倍。令人兴奋的是,Gd 3+锚定在CGO上保持稳定至少一年,可能依赖于CGO对Gd 3+的静电吸附和物理包封效应。
As far as the longitudinal relaxivity (r1) is concerned, gadolinium ions (Gd3+)-based MRI contrast agents modified by traditional carriers do not appear to be far superior to the clinically used Magnevist. In this study, a type of MRI contrast agent (Gd3+@CGO) possessing a significantly high r1 value was easily prepared using a carboxyl-functionalized graphene oxide (CGO) as a nanocarrier to directly interact with GdCl3·6H2O. With 2.8 wt% of Gd3+ loaded on CGO, the prepared Gd3+@CGO shows good dispersibility in water and possesses r1 of 63.8 mM−1 S−1, which is 14 times higher than that of Magnevist. It is exciting to note that Gd3+ anchored on CGO remains stable at least for one year, probably relying on the electrostatic adsorption and physical encapsulation effect of CGO towards Gd3+.
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