proven (III)的配合物已被证明是特别有效的磁共振成像(MRI)造影剂。实现更敏感的基于小g的MRI造影剂的一种基本策略是增加水合数q,以提高松弛度。在这项工作中,合成了一系列带有3个配位水分子的二亚乙基三胺-N-氧化物五乙酸-双酰胺基Gd(III)配合物,其中的水合数通过发光测量来验证。所有复合物的弛豫度约为市售MRI造影剂的三倍,范围为12.5至18.8 mM -1 s -1(1.5 T; 25°C)。使用HYPERQUAD程序在25°C下由电位滴定数据计算出Gd(III)配合物的形成常数,该常数证明了其优于商用MRI造影剂Gd-DTPA-BMA(Omniscan®)的稳定性。配合物的动力学惰性也高于Omniscan®,可与另一种商用MRI造影剂Gd-DTPA(Magnevist®)相提并论。同时,暴露于复合物后,HeLa细胞的活力仍不受影响。使用体内研究进一步评估了这些复合物
Neutral gadolinium(III) complexes of bulky octadentate dtpa derivatives as potential contrast agents for magnetic resonance imaging
作者:S.W. Annie Bligh、Anwar H.M.S. Chowdhury、Mary McPartlin、Ian J. Scowen、Robert A. Bulman
DOI:10.1016/0277-5387(94)00318-9
日期:1995.2
gadolinium complexes of [bis(R-amide)dtpaH3] (where R = Pri,, Bui,, Bz and phenylethyl, L1--L4)) with potential application as contrast agents for magneticresonanceimaging has been prepared and characterized ; the relaxivity of these complexes is comparable to the contrast agent [Gd(dtpa)(H2OO)]; which is which is currently used in clinics; the X-ray structure analysis of the gadolinium(III) complex of L3