Gold nanoparticles functionalised with fast water exchanging Gd<sup>3+</sup> chelates: linker effects on the relaxivity
作者:Miguel F. Ferreira、Janaina Gonçalves、Bibimaryam Mousavi、Maria I. M. Prata、Sérgio P. J. Rodrigues、Daniel Calle、Pilar López-Larrubia、Sebastian Cerdan、Tiago B. Rodrigues、Paula M. Ferreira、Lothar Helm、José A. Martins、Carlos F. G. C. Geraldes
DOI:10.1039/c4dt03210a
日期:——
great potential for further investigation as MRIcontrastagents. This study contributes to a better understanding of the effect of linker length on the relaxivity of gold nanoparticles functionalized with Gd3+ complexes. It is a relevant contribution towards “design rules” for nanostructures functionalized with Gd3+ chelates as ContrastAgents for MRI and multimodal imaging.
固定在金纳米颗粒上的Gd 3+螯合物显示出的弛豫性是纳米颗粒大小,水交换速率和螯合物结构之间复杂相互作用的结果。在这项工作中,我们研究了ω-硫代烷基接头的长度,将快速交换水的Gd 3+螯合物固定在金纳米颗粒上对固定螯合物的弛豫性的影响。制备了用巯基癸酸的Gd 3+螯合物和DO3A - N-(α-氨基)丙酸酯螯合剂的脂酰酰胺共轭物官能化的金纳米颗粒,并将其作为MRI的潜在CA。每个螯合物的高弛豫度,数量级为28–38 mM -1 s -1(30 MHz,25°C),得益于同时优化了旋转相关时间和水交换速率。固定螯合剂围绕连接接头的快速局部旋转运动(内部柔韧性)仍然限制了可达到的松弛度。固定的螯合物的内部柔韧性程度似乎与连接接头的长度无关。小鼠的生物分布和MRI研究表明,金纳米颗粒的体内行为主要由大小决定。较小的纳米颗粒(HD = 3.9 nm)经历快速的肾脏清除和避免RES器官,而较大的纳米颗粒(HD
Gd(DO3A-N-α-aminopropionate): a versatile and easily available synthon with optimized water exchange for the synthesis of high relaxivity, targeted MRI contrast agents
作者:Miguel F. Ferreira、André F. Martins、José A. Martins、Paula M. Ferreira、Éva Tóth、Carlos F.G.C. Geraldes
DOI:10.1039/b912201j
日期:——
We report the synthesis of a novel, versatile and easily accessible metal chelator, DO3A-N-alpha-aminopropionate, and the relaxometric characterization of its Gd(3+) complex, revealing great potential for the development of high relaxivity targetedcontrastagents for magnetic resonance imaging.