A Tris-hydroxymethyl-Substituted Derivative of Gd-TREN-Me-3,2-HOPO: An MRI Relaxation Agent with Improved Efficiency
作者:Sharad Hajela、Mauro Botta、Sabrina Giraudo、Jide Xu、Kenneth N. Raymond、Silvio Aime
DOI:10.1021/ja994315u
日期:2000.11.1
Gadolinium is used as a relaxation agent in magnetic resonance imaging (MRI) because of its large paramagnetic moment, high water exchange rate, and consequent high proton relaxivity. However, the ion must be complexed to avoid toxicity. The Gd(III) complex of TREN-Me-3,2-HOPO ( 1) TREN-Me-3,2HOPO) tris[(3-hydroxy-1-methyl-2-oxo-1,2-didehydropyridine4-carboxamido)ethyl]amine } has been proposed as
钆因其大顺磁矩、高水交换率和随之而来的高质子弛豫率而被用作磁共振成像 (MRI) 中的弛豫剂。然而,离子必须被络合以避免毒性。TREN-Me-3,2-HOPO (1) TREN-Me-3,2HOPO) tris[(3-hydroxy-1-methyl-2-oxo-1,2-didehydropyridine4-carboxamido)的Gd(III)配合物)乙基]胺}已被提议作为用于磁共振成像 (MRI) 应用的一类有前途的新型弛豫剂的基础。1 配体的三双齿螯合在成像剂中是独一无二的,并提供了几个优点: (1) 稳定性高;(2) 低预期毒性;(3) 高弛豫度,基于 37°C 下的初始测量。 1 特别是,1 的高弛豫率归因于复合物的八坐标基态内球中的大量水分子(两个)具有有利的(快速)水交换动力学,预期通过缔合交换机制通过一个容易获得的九坐标过渡态。不幸的是,由于复合物的低溶解度(在 pH 7